Sanitary Drainage

NYC Admin. Code tit. 28, ch. 6, art. 601, ch. 7

in effect

NYC Plumbing Code § PC 701 General

Section PC 701: General 701.1 Scope. The provisions of this chapter shall govern the materials, design, construction and installation of sanitary drainage systems. 701.2 Sewer required. Buildings in which plumbing fixtures are installed and premises having drainage piping shall be connected to a public sewer, where available and where connection thereto is feasible. Where neither a sanitary nor a combined sewer is available to which connection is feasible, a private sewer or private sewage disposal system shall be provided. See Section 107.6.1 for required construction documents relating to provisions for discharge for sanitary sewage. 701.2.1 Extensions of public sanitary or combined sewers. Extensions of public sanitary or combined sewers shall be made in accordance with the regulations of the Department of Environmental Protection. 701.2.2 Availability of public sanitary or combined sewer. The determination as to whether a public sanitary or combined sewer is available shall be made in accordance with the applicable standards of the Department of Environmental Protection. 701.2.3 Feasibility of connecting to an available sanitary or combined public sewer. The determination as to whether connection to an available sanitary or combined public sewer is feasible shall be in accordance with the applicable standards of the Department of Environmental Protection. 701.2.4 Where public sewers are made available to premises with private sewage disposal system. When public sewers are made available to premises with individual on-site private disposal systems, such private sewage disposal system shall be abandoned in a manner prescribed by the commissioner, and the owner shall connect the building house sewer to the available public sewer within 6 months of the date of notification that the sewer has been accepted to receive flow by the agency or agencies having jurisdiction. 701.2.5 Abandonment of existing building sewer connections. All abandoned building sewers shall require plug permits from the Department of Environmental Protection and shall be securely sealed at a point inside the curb line and as close thereto as practicable. 701.3 Separate sewer connection. A building having plumbing fixtures installed and intended for human habitation, occupancy or use on premises abutting on a street, alley or easement in which there is a public sewer shall have a separate connection with the sewer. Where located on the same lot, multiple buildings shall not be prohibited from connecting to a common building sewer that connects to the public sewer, provided, however, that the common elements of an internal private drain are located in a dedicated, unobstructed right-of-way that extends to the sewer with a minimum width of 10 feet (3048 mm) located entirely outside of the building footprint and outside of all overhangs and projections that are less than 14 feet (4267 mm) in height above grade. 701.4 Sewage treatment. Sewage or other waste shall not be discharged into surface or subsurface water unless it has been discharged by a method subject to the approval of the commissioner and of the Department of Health and Mental Hygiene, the Department of Environmental Protection, and the New York State Department of Environmental Conservation. 701.5 Damage to drainage system or public sewer. Waste detrimental to the public sewer system or to the functioning of the sewage-treatment plant shall be treated and disposed of in accordance with applicable rules of the Department of Environmental Protection. 701.6 Tests The sanitary drainage system shall be tested in accordance with Section 312. 701.7 Engineered systems. Engineered sanitary drainage systems shall conform to the provisions of Section 28-113.2.2 of the Administrative Code and Section 714 of this code. (Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023) Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077. 701.8 Drainage piping in food service areas. Exposed soil or waste piping shall not be installed above any working, storage or eating surfaces in food service establishments. 701.9 Plastic pipe. Plastic piping and fittings shall not be used. Exceptions: 1. Plastic piping and fittings may be used in residential buildings five stories or less in height. 2. Plastic piping and fittings may be used as permitted in Section 803. 701.10 Cured-in-place pipe. Cured-in-place pipe (CIPP) and epoxy spray pipe lining systems shall not be used. 701.11 Connections. Direct connection of a steam exhaust, blowoff or drip pipe shall not be made with the building drainage system. Wastewater when discharged into the building drainage system shall be at a temperature not higher than 150°F (65.6°C). When higher temperatures exist, approved cooling methods shall be provided.

NYC Plumbing Code § PC 702 Materials

Section PC 702: Materials 702.1 Above-ground sanitary drainage and vent pipe. Above-ground soil, waste and vent pipe shall conform to one of the standards listed in Table 702.1. Table 702.1 Above-Ground Drainage and Vent Pipe Material Standard Acrylonitrile butadiene styrene (ABS) plastic pipe in IPS diameters, including Schedule 40, DR 22 (PS 200) and DR 24 (PS 140); with a solid, cellular core or composite wall a ASTM D 2661; ASTM F 628; ASTM F 1488; CSA B181.1 Brass pipe ASTM B 43 Cast-iron pipe ASTM A 74; ASTM A 888; CISPI 301 Copper or copper-alloy pipe ASTM B 42; ASTM B 302 Copper or copper-alloy tubing (Type K or L) ASTM B 75; ASTM B 88; ASTM B 251 Ductile iron AWWA C151 Galvanized steel pipe ASTM A 53 Polyvinyl chloride (PVC) plastic pipe in IPS diameters, including Schedule 40, DR 22 (PS 200), and DR 24 (PS 140); with a solid, cellular core or composite wall a ASTM D 2665; ASTM F 891; ASTM F 1488; CSA B181.2 Polyvinyl chloride (PVC) plastic pipe with a 3.25-inch O.D. and a solid, cellular core or composite wall a ASTM D 2949; ASTM F 1488 Stainless steel drainage systems, Types 304 and 316L ASME A112.3.1 For SI: 1 inch = 25.4 mm. a. Limited to residential buildings five stories or less in height. 702.2 Underground building sanitary drainage and vent pipe. Underground building sanitary drainage and vent pipe shall conform to one of the standards listed in Table 702.2. Table 702.2 Underground Building Drainage and Vent Pipe Material Standard Cast-iron pipe ASTM A 74; ASTM A 888; CISPI 301 Copper or copper alloy tubing (Type K or L) ASTM B 75; ASTM B 88; ASTM B 251 Ductile iron AWWA C151 Polyolefin pipe ASTM F 1412; CSA B181.3 Polyvinyl chloride (PVC) plastic pipe in IPS diameters, including Schedule 40, DR 22 (PS 200), and DR 24 (PS 140); with a solid, cellular core or composite wall a ASTM D 2665; ASTM F 891; ASTM F 1488; CSA B181.2 Stainless steel drainage systems, Type 316L ASME A112.3.1 For SI: 1 inch = 25.4 mm. a. Limited to residential buildings five stories or less in height. 702.3 Building drain pipe. Building drain pipe shall conform to one of the standards listed in Table 702.3. Table 702.3 Building Sewer Pipe Material Standard Cast-iron pipe ASTM A 74; ASTM A 888; CISPI 301 Chlorinated polyvinyl chloride (CPVC) plastic a ASTM F 437; ASTM F 438; ASTM F 439 Copper or copper-alloy tubing (Type K or L) ASTM B 75; ASTM B 88; ASTM B 251 Ductile iron AWWA C151 Galvanized steel pipe ASTM A 53; ASTM A 123 Polyvinyl chloride (PVC) plastic pipe (Type DWV, SDR26, SDR35, SDR41, PS50 or PS100) a ASTM D 2665; ASTM D 3034; ASTM F 891; CSA B182.2; CSA B182.4; CSA B181.2 Stainless steel drainage systems, types 304 and 316L ASME A112.3.1 For SI: 1 inch = 25.4 mm. a. Limited to residential buildings five stories or less in height. 702.4 Fittings. Pipe fittings shall be approved for installation with the piping material installed and shall comply with the applicable standards listed in Table 702.4. Table 702.4 Pipe Fittings Material Standard Acrylonitrile butadiene styrene (ABS) plastic pipe in IPS diameters a ASTM D 2661; ASTM F 628; CSA B181.1 Acrylonotrile butadiene styrene (ABS) plastic pipe in sewer and drain diameters ASTM D 2751 Brass ASTM B 62 Cast iron ASME B16.4; ASME B16.12; ASTM A 74; ASTM A 888; CISPI 301 Chlorinated polyvinyl chloride (CPVC) plastic a ASTM F 437; ASTM F 438; ASTM F 439 Copper or copper alloy ASME B16.15; ASME B16.18; ASME B16.22; ASME B16.23; ASME B16.26; ASME B16.29 Galvanized steel ASTM A 153; ASME B16.3 Ductile iron AWWA C110 Malleable iron ASME B16.3 Polyethylene (PE) plastic pipe a ASTM F 2306 / F 2306M Polyvinyl chloride (PVC) plastic in IPS diameters a ASTM D 2665; ASTM F 1866 Polyvinyl chloride (PVC) plastic pipe in sewer and drain diameters a ASTM D 3034 Polyvinyl chloride (PVC) plastic pipe with a 3.25-inch O.D. a ASTM D 2949 Stainless steel drainage systems, Types 304 and 316L ASME A112.3.1 For SI: 1 inch = 25.4 mm. a. Limited to residential buildings five stories or less in height. 702.5 Temperature rating. Where the waste water temperature will be greater than 140°F (60°C), the sanitary drainage piping material shall be rated for the highest temperature of the waste water. 702.6 Chemical waste system. A chemical waste system shall be completely separated from the sanitary drainage system. The chemical waste shall be treated in accordance with Section 803.2 before discharging to the sanitary drainage system. Separate drainage systems for chemical wastes and vent pipes shall be constructed in accordance with Section 803.3. 702.7 Lead bends and traps. The wall thickness of lead bends and traps shall be not less than 1/8 inch (3.2 mm).

NYC Plumbing Code § PC 703 Building Drain

Section PC 703: Building Drain 703.1 Building drain pipe near the water service. Where the building drain is installed underground and within 5 feet (1524 mm) of the water service, as provided for in Section 603.2, the building drain pipe shall conform to one of the standards for, cast-iron pipe, copper or copper-alloy tubing, or ductile iron listed in Table 702.3. 703.2 Drainage pipe in filled ground. Where a building drain is installed on filled or unstable ground, the drainage pipe shall conform to one of the standards for, cast-iron pipe, copper or copper-alloy tubing, ductile iron, nonasbestos fiber cement or concrete pipe listed in Table 702.3. 703.3 Sanitary and storm drains. Where separate systems of sanitary drainage and storm drainage are installed in the same property, the sanitary and storm building drains shall be permitted to be laid side by side in one trench. 703.4 Existing building drains. Existing building drains shall connect with new building drainage systems only where found by examination and test to conform to the new system in quality of material. The commissioner shall notify the owner to make the changes necessary to conform to this code. 703.5 Cleanouts on building drains. Cleanouts on building drains shall be located as set forth in Section 708. 703.6 Combined sanitary and storm public sewer. Where the public sewer is a combined system for both sanitary and storm water, the sanitary building drain shall be connected in accordance with Section 1109.1. 703.7 Building house traps. Building house traps shall be installed on all building drains in accordance with Section 1002.6. 703.7.1 Fresh air inlets. Every sanitary or combined building drain shall be provided with a fresh air inlet pipe connected to the building drain immediately upstream from and within 4 feet (1219 mm) of the building trap. Such connection shall be made in the same manner as prescribed in Section 905 for vent connections to horizontal drains, and the fresh air inlet pipe shall be extended to the outer air and shall be terminated in an open end at least 6 inches (152 mm) above grade. The open end shall be protected by a perforated metal plate permanently fixed in the mouth of the inlet and having an open ventilating area at least equal to the area of the pipe, or by a return bend with its unprotected open end at least 6 inches (152 mm) above grade, located inside the street line. The size of the fresh air inlet pipe shall be at least one-half the diameter of the building drain at the point of connection, but not less than 3 inches (76 mm). (Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023) Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077. 703.7.2 Fresh air inlets located in flood hazard areas. Fresh air inlets located in flood hazard areas shall be located above the design flood elevation in accordance with Section G304 of Appendix G of the New York City Building Code.

NYC Plumbing Code § PC 704 Drainage Piping Installation

Section PC 704: Drainage Piping Installation 704.1 Slope of horizontal drainage piping. Horizontal drainage piping shall be installed in uniform alignment at uniform slopes. The slope of a horizontal drainage pipe shall be not less than that indicated in Table 704.1. Table 704.1 Slope of Horizontal Drainage Pipe Size (inches) Minimum Slope (inch per foot) 2 1/2 or less 1/4 3 to 6 1/8 8 or larger 1/16 For SI: 1 inch = 25.4 mm, 1 inch per foot = 83.33 mm/m. 704.2 Change in size. The size of the drainage piping shall not be reduced in size in the direction of the flow. A 4-inch by 3-inch (102 mm by 76 mm) water closet connection shall not be considered as a reduction in size. 704.3 Connections to offsets and bases of stacks. Horizontal branches shall connect to the bases of stacks at a point located not less than 10 times the diameter of the drainage stack downstream from the stack. Horizontal branches shall connect to horizontal stack offsets at a point located not less than 10 times the diameter of the drainage stack downstream from the upper stack. 704.4 Future fixtures. Drainage piping for future fixtures shall terminate with an approved cap or plug. 704.5 Dead ends. In the installation or removal of any part of a drainage system, dead ends shall be prohibited. Cleanout extensions and approved future fixture drainage piping shall not be considered as dead ends. 704.6 Suds Pressure Zones Vents. Where sinks, laundry trays, laundry washing machines, bathtubs, and similar fixtures in which detergents producing suds are normally used and discharged at an upper floor level into a soil or waste stack that also serves fixtures in other occupancy units at a lower floor level, the drainage and vent piping for such lower fixtures shall be arranged so as to avoid connection to suds pressure zones in the sanitary drainage and vent systems. If connected to the sanitary system, a suds relief vent relieving to a nonpressure zone shall be provided at each suds pressure zone where such connections are installed. The diameter of such relief vent shall be at least 3/4 the diameter of the piping in which the pressure zone occurs, but not less than 2 inches (51 mm). Suds pressure zones shall be considered to exist at the following locations in sanitary drainage and vent systems when the piping serves fixtures on two or more floors that receive wastes that contain detergents producing suds: 1. In a soil or waste stack a zone shall be considered to exist in the vertical portion within 40 stack diameters of the base fitting. 2. In the horizontal drain at the base of a soil or waste stack a zone shall be considered to exist in the horizontal portion within 10 stack diameters of the base fitting. Where a 60-degree (1.05 rad) or 90-degree (1.57 rad) fitting is installed in the horizontal drain, a zone shall be considered to exist in the horizontal portion within 40 drain diameters upstream of and 10 drain diameters downstream of the fitting in accordance with Figure 704.6. 3. In a soil or waste stack offset of 60 degrees (1.05 rad) or 90 degrees (1.57 rad), a zone shall be considered to exist in the vertical portion of the stack within 40 stack diameters of the base fitting for the upper section of the stack. The zone shall be considered to exist in the horizontal offset within 10 stack diameters of such base fitting and within 40 stack diameters of the top fitting for the lower section of the stack. 4. In a vent stack that has its base connected to a suds pressure zone in the sanitary drainage system, a zone shall be considered to exist in the portion of the vent stack extending from its base connection up to the lowest branch vent fitting located above the level of the suds pressure zone in the sanitary drainage system. Figure: PCFig704-6

Figure 704.6 Suds Pressure Zones 704.7 Collection pipe labeling and marking. Collection piping that conveys untreated water for reuse shall be painted gray in color or covered in a gray jacket and shall be labeled, embossed, or integrally stamped or marked, with the words: "CAUTION: UNTREATED WATER FOR RE-USE" or the piping shall be installed with a gray identification tape or wrap. Pipe identification shall include the contents of the piping system and an arrow indicating the direction of flow. Hazardous piping systems shall also contain information addressing the nature of the hazard. Pipe identification shall be repeated at intervals not exceeding 25 feet (7620 mm) and at each point where the piping passes through a wall, floor or roof. Lettering shall be readily observable within the room or space where the piping is located. (Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023) Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077.

NYC Plumbing Code § PC 705 Joints

Section PC 705: Joints 705.1 General. This section contains provisions applicable to joints specific to sanitary drainage piping. 705.2 ABS plastic. Joints between ABS plastic pipe or fittings shall comply with Sections 705.2.1 through 705.2.3. 705.2.1 Mechanical joints. Mechanical joints on drainage pipes shall be made with an elastomeric seal conforming to ASTM C 1173, ASTM D 3212 or CSA B602. Mechanical joints shall be installed only in underground systems unless otherwise approved. Joints shall be installed in accordance with the manufacturer's instructions and in conformance with acceptance criteria established by the commissioner. 705.2.2 Solvent cementing. Joint surfaces shall be clean and free from moisture. Solvent cement that conforms to ASTM D 2235 or CSA B181.1 shall be applied to all joint surfaces. The joint shall be made while the cement is wet. Joints shall be made in accordance with ASTM D 2235, ASTM D 2661, ASTM F 628 or CSA B181.1. Solvent-cement joints shall be permitted above or below ground. 705.2.3 Threaded joints. Threads shall conform to ASME B1.20.1. Schedule 80 or heavier pipe shall be permitted to be threaded with dies specifically designed for plastic pipe. Approved thread lubricant or tape shall be applied on the male threads only. 705.3 Brass. Joints between brass pipe or fittings shall comply with Sections 705.3.1 through 705.3.4. 705.3.1 Brazed joints. All joint surfaces shall be cleaned. An approved flux shall be applied where required. The joint shall be brazed with a filler metal conforming to AWS A5.8. 705.3.2 Mechanical joints. Mechanical joints shall be installed in accordance with the manufacturer's instructions and in conformance with acceptance criteria established by the commissioner. 705.3.3 Threaded joints. Threads shall conform to ASME B1.20.1. Pipe-joint compound or tape shall be applied on the male threads only. 705.3.4 Welded joints. All joint surfaces shall be cleaned. The joint shall be welded with an approved filler metal. 705.4 Cast iron. Joints between cast-iron pipe or fittings shall comply with Sections 705.4.1 through 705.4.3. 705.4.1 Caulked joints. Joints for hub and spigot pipe shall be firmly packed with oakum or hemp. Molten lead shall be poured in one operation to a depth of not less than 1 inch (25 mm). The lead shall not recede more than inch (3.2 mm) below the rim of the hub and shall be caulked tight. Paint, varnish or other coatings shall not be permitted on the jointing material until after the joint has been tested and approved. Lead shall be run in one pouring and shall be caulked tight. Acid-resistant rope and acidproof cement shall be permitted. 705.4.2 Compression gasket joints. Compression gaskets for hub and spigot pipe and fittings shall conform to ASTM C 564 and shall be tested to ASTM C 1563. Gaskets shall be compressed when the pipe is fully inserted. 705.4.3 Mechanical joint coupling. Mechanical joint couplings for hubless pipe and fittings shall consist of an elastomeric sealing sleeve and a metallic shield that comply with CISPI 310, ASTM C 1277 or ASTM C 1540. The elastomeric sealing sleeve shall conform to ASTM C 564 or CSA B602 and shall be provided with a center stop. Mechanical joint couplings shall be installed in accordance with the manufacturer's instructions. 705.5 Concrete joints. Joints between concrete pipe and fittings shall be made with an elastomeric seal conforming to ASTM C 443, ASTM C 1173, CSA A257.3M or CSA B602. 705.6 Copper pipe. Joints between copper or copper-alloy pipe or fittings shall comply with Sections 705.6.1 through 705.6.5. 705.6.1 Brazed joints. All joint surfaces shall be cleaned. An approved flux shall be applied where required. The joint shall be brazed with a filler metal conforming to AWS A5.8. 705.6.2 Mechanical joints. Mechanical joints shall be installed in accordance with the manufacturer's instructions and in conformance with acceptance criteria established by the commissioner. 705.6.3 Solder joints. Solder joints shall be made in accordance with the methods of ASTM B 828. Cut tube ends shall be reamed to the full inside diameter of the tube end. All joint surfaces shall be cleaned. A flux conforming to ASTM B 813 shall be applied. The joint shall be soldered with a solder conforming to ASTM B 32. 705.6.4 Threaded joints. Threads shall conform to ASME B1.20.1. Pipe-joint compound or tape shall be applied on the male threads only. 705.6.5 Welded joints. All joint surfaces shall be cleaned. The joint shall be welded with an approved filler metal. 705.7 Copper tubing. Joints between copper or copper-alloy tubing or fittings shall comply with Sections 705.7.1 through 705.7.3. 705.7.1 Brazed joints. All joint surfaces shall be cleaned. An approved flux shall be applied where required. The joint shall be brazed with a filler metal conforming to AWS A5.8. 705.7.2 Mechanical joints. Mechanical joints shall be installed in accordance with the manufacturer's instructions and in conformance with acceptance criteria established by the commissioner. 705.7.3 Solder joints. Solder joints shall be made in accordance with the methods of ASTM B 828. Cut tube ends shall be reamed to the full inside diameter of the tube end. All joint surfaces shall be cleaned. A flux conforming to ASTM B 813 shall be applied. The joint shall be soldered with a solder conforming to ASTM B 32. 705.8 Reserved. 705.9 Steel. Joints between galvanized steel pipe or fittings shall comply with Sections 705.9.1 and 705.9.2. 705.9.1 Threaded joints. Threads shall conform to ASME B1.20.1. Pipe-joint compound or tape shall be applied on the male threads only. 705.9.2 Mechanical joints. Joints shall be made with an approved elastomeric seal. Mechanical joints shall be installed in accordance with the manufacturer's instructions and in conformance with acceptance criteria established by the commissioner. 705.10 Lead. Joints between lead pipe or fittings shall comply with Sections 705.10.1 and 705.10.2. 705.10.1 Burned. Burned joints shall be uniformly fused together into one continuous piece. The thickness of the joint shall be at least as thick as the lead being joined. The filler metal shall be of the same material as the pipe. 705.10.2 Wiped. Joints shall be fully wiped, with an exposed surface on each side of the joint not less than 3/4 inch (19.1 mm). The joint shall be not less than inch (9.5 mm) thick at the thickest point. 705.11 PVC plastic. Joints between PVC plastic pipe or fittings shall comply with Sections 705.11.1 through 705.11.3. 705.11.1 Mechanical joints. Mechanical joints on drainage pipe shall be made with an elastomeric seal conforming to ASTM C 1173, ASTM D 3212 or CSA B602. Mechanical joints shall not be installed in above-ground systems, unless otherwise approved. Joints shall be installed in accordance with the manufacturer's instructions and in conformance with acceptance criteria established by the commissioner. 705.11.2 Solvent cementing. Joint surfaces shall be clean and free from moisture. A purple primer that conforms to ASTM F 656 shall be applied. Solvent cement not purple in color and conforming to ASTM D 2564, CSA B137.3, CSA B181.2 or CSA B182.1 shall be applied to all joint surfaces. The joint shall be made while the cement is wet and shall be in accordance with ASTM D 2855. Solvent cement joints shall be permitted above or below ground. Exception: A primer is not required where both of the following conditions apply: 1. The solvent cement used is third-party certified as conforming to ASTM D 2564. 2. The solvent cement is used only for joining PVC drain, waste and vent pipe and fittings in nonpressure applications in sizes up to and including 4 inches (102 mm) in diameter. 705.11.3 Threaded joints. Threads shall conform to ASME B1.20.1. Schedule 80 or heavier pipe shall be permitted to be threaded with dies specifically designed for plastic pipe. Approved thread lubricant or tape shall be applied on the male threads only. 705.12 Vitrified clay. Joints between vitrified clay pipe or fittings shall be made with an elastomeric seal conforming to ASTM C 425, ASTM C 1173 or CSA B602. 705.13 Polyethylene plastic pipe. Joints between polyethylene plastic pipe and fittings shall be underground and shall comply with Section 705.13.1 or 705.13.2. 705.13.1 Heat-fusion joints. Joint surfaces shall be clean and free from moisture. All joint surfaces shall be cut, heated to melting temperature and joined using tools specifically designed for the operation. Joints shall be undisturbed until cool. Joints shall be made in accordance with ASTM D 2657 and the manufacturer's instructions. 705.13.2 Mechanical joints. Mechanical joints in drainage piping shall be made with an elastomeric seal conforming to ASTM C 1173, ASTM D 3212 or CSA B602. Mechanical joints shall be installed in accordance with the manufacturer's instructions. 705.14 Reserved. 705.15 Reserved. 705.16 Joints between different materials. Joints between different piping materials shall be made with a mechanical joint of the compression or mechanical-sealing type conforming to ASTM C 1173, ASTM C 1460 or ASTM C 1461. Connectors and adapters shall be approved for the application and such joints shall have an elastomeric seal conforming to ASTM C 425, ASTM C 443, ASTM C 564, ASTM C 1440, ASTM F 477, CSA A257.3M or CSA B602, or as required in Sections 705.16.1 through 705.16.7. Joints between glass pipe and other types of materials shall be made with adapters having a TFE seal. Joints shall be installed in accordance with the manufacturer's instructions. 705.16.1 Copper or copper-alloy tubing to cast-iron hub pipe. Joints between copper or copper- alloy tubing and cast-iron hub pipe shall be made with a brass ferrule or compression joint. The copper or copper-alloy tubing shall be soldered to the ferrule in an approved manner, and the ferrule shall be joined to the cast-iron hub by a caulked joint or a mechanical compression joint. 705.16.2 Copper or copper-alloy tubing to galvanized steel pipe. Joints between copper or copper- alloy tubing and galvanized steel pipe shall be made with a brass converter fitting or dielectric fitting. The copper tubing shall be soldered to the fitting in an approved manner, and the fitting shall be screwed to the threaded pipe. 705.16.3 Cast-iron pipe to galvanized steel or brass pipe. Joints between cast-iron and galvanized steel or brass pipe shall be made by either caulked or threaded joints or with an approved adapter fitting. 705.16.4 Plastic pipe or tubing to other piping material. Joints between different types of plastic pipe or between plastic pipe and other piping material shall be made with an approved adapter fitting. Joints between plastic pipe and cast-iron hub pipe shall be made by a caulked joint or a mechanical compression joint. 705.16.5 Lead pipe to other piping material. Joints between lead pipe and other piping material shall be made by a wiped joint to a caulking ferrule, soldering nipple or bushing or shall be made with an approved adapter fitting. 705.16.6 Borosilicate glass to other materials. Joints between glass pipe and other types of materials shall be made with adapters having a TFE seal and shall be installed in accordance with the manufacturer's instructions. 705.16.7 Stainless steel drainage systems to other materials. Joints between stainless steel drainage systems and other piping materials shall be made with approved mechanical couplings. 705.17 Drainage slip joints. Slip joints shall comply with Section 405.8. 705.18 Caulking ferrules. Ferrules shall be of red brass and shall be in accordance with Table 705.18. Table 705.18 Caulking Ferrule Specifications Pipe Sizes (inches) Inside Diameter (inches) Length (inches) Minimum Weight Each 2 2 1/4 4 1/2 1 pound 3 3 1/4 4 1/2 1 pound 12 ounces 4 4 1/4 4 1/2 2 pounds 8 ounces For SI: 1 inch = 25.4 mm, 1 ounce = 28.35 g, 1 pound = 0.454 kg. 705.19 Soldering bushings. Soldering bushings shall be of red brass and shall be in accordance with Table 705.19. Table 705.19 Soldering Bushing Specifications Pipe Sizes (inches) Minimum Weight Each 1 1/4 6 ounces 1 1/2 8 ounces 2 14 ounces 2 1/2 1 pound 6 ounces 3 2 pounds 4 3 pounds 8 ounces For SI: 1 inch = 25.4 mm, 1 ounce = 28.35 g, 1 pound = 0.454 kg. 705.20 Stainless steel drainage systems. O-ring joints for stainless steel drainage systems shall be made with an approved elastomeric seal.

NYC Plumbing Code § PC 706 Connections Between Drainage Piping and Fittings

Section PC 706: Connections Between Drainage Piping and Fittings 706.1 Connections and changes in direction. All connections and changes in direction of the sanitary drainage system shall be made with approved drainage fittings. Connections between drainage piping and fixtures shall conform to Section 405. 706.2 Obstructions. The fittings shall not have ledges, shoulders or reductions capable of retarding or obstructing flow in the piping. Threaded drainage pipe fittings shall be of the recessed drainage type. This section shall not be applicable to tubular waste fittings used to convey vertical flow upstream of the trap seal liquid level of a fixture trap. 706.3 Installation of fittings. Fittings shall be installed to guide sewage and waste in the direction of flow. Change in direction shall be made by fittings installed in accordance with Table 706.3. Change in direction by combination fittings, side inlets or increasers shall be installed in accordance with Table 706.3 based on the pattern of flow created by the fitting. Table 706.3 Fittings for Change in Direction Type of Fitting Pattern Change in Direction Horizontal to vertical Vertical to horizontal Horizontal to horizontal Sixteenth bend X X X Eighth bend X X X Sixth bend X X X Quarter bend X X a X a Short sweep X X a, b X a Long sweep X X X Sanitary tee X c – – Wye X X X Combination wye and eighthbend X X X For SI: 1 inch = 25.4 mm. a. The fittings shall only be permitted for a 2-inch or smaller fixture drain. b. Three inches or larger. c. For a limitation on double sanitary tees, see Section 706.3. 706.4 Reserved.

NYC Plumbing Code § PC 707 Prohibited Joints and Connections

Section PC 707: Prohibited Joints and Connections 707.1 Prohibited joints. The following types of joints and connections shall be prohibited: 1. Cement or concrete joints. 2. Mastic or hot-pour bituminous joints. 3. Joints made with fittings not approved for the specific installation. 4. Joints between different diameter pipes made with elastomeric rolling O-rings. 5. Solvent-cement joints between different types of plastic pipe. 6. Saddle-type fittings.

NYC Plumbing Code § PC 708 Cleanouts

Section PC 708: Cleanouts 708.1 Cleanouts required. Cleanouts shall be provided for drainage piping in accordance with Sections 708.1.1 through 708.1.12. 708.1.1 Horizontal drains and building drains. Horizontal drainage pipes in buildings shall have cleanouts located at intervals of not more than 100 feet (30 480 mm). Building drains shall have cleanouts located at intervals of not more than 100 feet (30 480 mm). Exception: Horizontal fixture drain piping serving a nonremovable trap shall not be required to have a cleanout for the section of piping between the trap and the vent connection for such trap. 708.1.2 Building sewers. Building sewers smaller than 8 inches (203 mm) shall have cleanouts located at intervals of not more than 100 feet (30 480 mm). Building sewers 8 inches (203 mm) and larger shall have a manhole located not more than 200 feet (60 960 mm) from the junction of the building drain and building sewer and at intervals of not more than 400 feet (122 m). The interval length shall be measured from the cleanout or manhole opening, along the developed length of the piping to the next drainage fitting providing access for cleaning, a manhole or the end of the building sewer. 708.1.3 Building drain and building sewer junction. The junction of the building drain and the building sewer shall be served by a cleanout that is located at the junction or within 10 feet (3048 mm) of the developed length of piping upstream of the junction. For the requirements of this section, the cleanout access shall not be provided by water closet removal. 708.1.4 Changes of direction. Where a horizontal drainage pipe, a building drain or a building sewer has a change of horizontal direction greater than 45 degrees (0.79 rad), a cleanout shall be installed at the change of direction. Where more than one change of horizontal direction greater than 45 degrees (0.79 rad) occurs within 40 feet (12 192 mm) of developed length of piping, the cleanout installed for the first change of direction shall serve as the cleanout for all changes in direction within that 40 feet (12 192 mm) of developed length of piping. 708.1.5 Cleanout size. Cleanouts shall be the same size as the piping served by the cleanout, except that cleanouts for piping larger than 4 inches (102 mm) need not be larger than 4 inches (102 mm). Exceptions: 1. A removable P-trap with slip or ground joint connections can serve as a cleanout for drain piping that is one size larger than the P-trap size. 2. Cleanouts located on stacks can be one size smaller than the stack size. 3. The size of cleanouts for cast-iron piping can be in accordance with the referenced standards for cast-iron fittings as indicated in Table 702.4. 708.1.6 Cleanout plugs. Cleanout plugs shall be of brass, plastic or other approved materials. Cleanout plugs for borosilicate glass piping systems shall be of borosilicate glass. Brass cleanout plugs shall conform to ASTM A 74 and shall be limited for use only on metallic piping systems. Plastic cleanout plugs shall conform to the referenced standards for plastic pipe fittings, as indicated in Table 702.4. Cleanout plugs shall have a raised square head, a countersunk square head or a countersunk slot head. Where a cleanout plug will have a trim cover screw installed into the plug, the plug shall be manufactured with a blind end threaded hole for such purpose. 708.1.7 Manholes. Manholes and manhole covers shall be of an approved type. Manholes located inside of a building shall have gas-tight covers that require tools for removal. 708.1.8 Installation arrangement. The installation arrangement of a cleanout shall enable cleaning of drainage piping only in the direction of drainage flow. Exceptions: 1. Test tees serving as cleanouts. 2. A two-way cleanout installation that is approved for meeting the requirements of Section 708.1.3. 708.1.9 Required clearance. Cleanouts for 6-inch (153 mm) and smaller piping shall be provided with a clearance of not less than 18 inches (457 mm) from, and perpendicular to, the face of the opening to any obstruction. Cleanouts for 8-inch (203 mm) and larger piping shall be provided with a clearance of not less than 36 inches (914 mm) from, and perpendicular to, the face of the opening to any obstruction. 708.1.10 Cleanout access. Required cleanouts shall be provided with access. Cleanouts on concealed piping or piping under a floor slab or in a crawl space of less than 24 inches (610 mm) in height or a plenum shall be extended through and terminate flush with the finished wall, floor or ground surface or shall be extended to the outside of the building. Cleanouts with openings at a finished wall shall have the face of the opening located within 1 1/2 inches (38 mm) of the finished wall surface. Cleanouts located below grade shall be extended to grade level so that the top of the cleanout plug is at or above grade. A cleanout installed in a floor or walkway that will not have a trim cover installed shall have a countersunk plug installed so the top surface of the plug is flush with the finished surface of the floor or walkway. 708.1.10.1 Cleanout plug trim covers. Trim covers and access doors for cleanout plugs shall be designed for such purposes and shall be approved. Trim cover fasteners that thread into cleanout plugs shall be corrosion resistant. Cleanout plugs shall not be covered with mortar, plaster or any other permanent material. 708.1.10.2 Floor cleanout assemblies. Where it is necessary to protect a cleanout plug from the loads of vehicular traffic, cleanout assemblies in accordance with ASME A112.36.2M shall be installed. (Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023) Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077. 708.1.11 Prohibited use. The use of a threaded cleanout opening to add a fixture or to extend piping shall be prohibited except where another cleanout of equal size is installed with the required access and clearance. 708.1.12 Base of stack. A cleanout shall be provided at the base of each waste or soil stack.

NYC Plumbing Code § PC 709 Fixture Units

Section PC 709: Fixture Units 709.1 Values for fixtures. Drainage fixture unit values as given in Table 709.1 designate the relative load weight of different kinds of fixtures that shall be employed in estimating the total load carried by a soil or waste pipe, and shall be used in connection with Tables 710.1(1) and 710.1(2) of sizes for soil, waste and vent pipes for which the permissible load is given in terms of fixture units. Table 709.1 Drainage Fixture Units for Fixtures and Groups Fixture Type Drainage Fixture Unit Value as Load Factors Minimum Size of Trap (inches) Automatic clothes washers, commercial a, g 3 2 Automatic clothes washers, residential g 2 2 Bathroom group as defined in Section 202 f 5 – Bathtub b (with or without overhead shower or whirlpool attachments) 2 1 1/2 Bidet 1 1 1/4 Combination sink and tray 2 1 1/2 Dental lavatory 1 1 1/4 Dental unit or cuspidor 1 1 1/4 Dishwashing machine c, domestic 2 1 1/2 Drinking fountain 1/2 1 1/4 Emergency floor drain 0 2 Floor drains 2 h 3 Floor sinks Note h 2 Hand wash sinks and lavatories (circular or multiple) each faucet 2 1 1/2 Kitchen sink, domestic 2 2 Kitchen sink, domestic with food waste disposer and/or dishwasher 2 2 Laundry tray (1 or 2 compartments) 2 2 Lavatory 1 1 1/4 Multiple (gang) shower (based on the total flow rate through shower heads and body sprays) Flow rate: 5.7 gpm or less 2 2 Greater than 5.7 gpm to 12.3 gpm 3 2 Greater than 12.3 gpm to 25.8 gpm 5 3 Greater than 25.8 gpm to 55.6 gpm 6 4 Shower 2 2 Sink 2 2 Urinal 4 Note d Urinal, 1 gallon per flush or less 2 e Note d Urinal, nonwater supplied 1/2 Note d Water closet, flushometer, tank, public or private 4 e Note d For SI: 1 inch = 25.4 mm, 1 gallon = 3.785 L, gpf = gallon per flushing cycle, gpm = gallon per minute. a. For traps larger than 3 inches, use Table 709.2. b. A showerhead over a bathtub or whirlpool bathtub attachment does not increase the drainage fixture unit value. c. See Sections 709.2 through 709.4.1 for methods of computing unit value of fixtures not listed in this table or for rating of devices with intermittent flows. d. Trap size shall be consistent with the fixture outlet size. e. For the purpose of computing loads on building drains and sewers, water closets and urinals shall not be rated at a lower drainage fixture unit unless the lower values are confirmed by testing. f. For fixtures added to a bathroom group, add the dfu value of those additional fixtures to the bathroom group fixture count. g. See Section 406.3 for sizing requirements for fixture drain, branch drain and drainage stack for an automatic clothes washer standpipe. h. See Sections 709.4 and 709.4.1. 709.2 Fixtures not listed in Table 709.1. Fixtures not listed in Table 709.1 shall have a drainage fixture unit load based on the outlet size of the fixture in accordance with Table 709.2. The minimum trap size for unlisted fixtures shall be the size of the drainage outlet but not less than 1 1/4 inches (32 mm). Table 709.2 Drainage Fixture Units for Fixture Drains or Traps Fixture Drain or Trap Size (inches) Drainage Fixture Unit Value 1 1/4 1 1 1/2 2 2 3 2 1/2 4 3 5 4 6 For SI: 1 inch = 25.4 mm. 709.3 Values for continuous and semicontinuous flow. Drainage fixture unit values for continuous and semicontinuous flow into a drainage system shall be computed on the basis that 1 gpm (0.06 L/s) of flow is equivalent to two fixture units. 709.4 Values for indirect waste receptor. The drainage fixture unit load of an indirect waste receptor receiving the discharge of indirectly connected fixtures shall be the sum of the drainage fixture unit values of the fixtures that discharge to the receptor, but not less than the drainage fixture unit value given for the indirect waste receptor in Table 709.1 or 709.2. 709.4.1 Clear-water waste receptors. Where waste receptors such as funnel drains, floor sinks and hub drains receive only clear-water waste from display cases, refrigerated display cases, ice bins, coolers and freezers, such receptors shall have a drainage fixture unit value of one-half.

NYC Plumbing Code § PC 710 Drainage System Sizing

Section PC 710: Drainage System Sizing 710.1 Maximum fixture unit load. The maximum number of drainage fixture units connected to a given size of building sewer, building drain or horizontal branch of the building drain shall be determined using Table 710.1(1). The maximum number of drainage fixture units connected to a given size of horizontal branch or vertical soil or waste stack shall be determined using Table 710.1(2). Table 710.1(1) Building Drains and Sewers Diameter of Pipe (inches) Maximum Number of Drainage Fixture Units Connected to any Portion of the Building Drain or the Building Sewer, Including Branches of the Building Drain a Slope per foot 1/16 inch 1/8 inch 1/4 inch 1/2 inch 1 1/4 — — 1 1 1 1/2 — — 3 3 2 — — 21 26 2 1/2 — — 24 31 3 — 36 42 50 4 — 180 216 250 5 — 390 480 575 6 — 700 840 1,000 8 1,400 1,600 1,920 2,300 10 2,500 2,900 3,500 4,200 12 3,900 4,600 5,600 6,700 15 7,000 8,300 10,000 12,000 For SI: 1 inch = 25.4 mm, 1 inch per foot = 83.3 mm/m. a. The minimum size of any building drain serving a water closet shall be 3 inches. Table 710.1(2) Horizontal Fixture Branches and Stacks a Diameter of Pipe (inches) Total for horizontal branch Maximum Number of Drainage Fixture Units (dfu) Stacks b Total for Stack of Three Branch Intervals or Less Total for Stack Greater than Three Branch Intervals 1 1/2 3 4 8 2 6 10 24 2 1/2 12 20 42 3 20 48 72 4 160 240 500 5 360 540 1,100 6 620 960 1,900 8 1,400 2,200 3,600 10 2,500 3,800 5,600 12 2,900 6,000 8,400 15 7,000 Note c Note c For SI:1 inch = 25.4 mm a. Does not include branches of the building drain. Refer to Table 710.1(1). b. Stacks shall be sized based on the total accumulated connected load at each story or branch interval. No soil or waste stack shall be smaller than any horizontal branch connection thereto. c. Sizing load based on design criteria. 710.1.1 Horizontal stack offsets. Horizontal stack offsets shall be sized as required for building drains in accordance with Table 710.1(1), except as required by Section 711.3. 710.1.2 Vertical stack offsets. Vertical stack offsets shall be sized as required for straight stacks in accordance with Table 710.1(2), except where required to be sized as a building drain in accordance with Section 711.1.1. 710.2 Future fixtures. Where provision is made for the future installation of fixtures, those provided for shall be considered in determining the required sizes of drain pipes.

NYC Plumbing Code § PC 711 Offsets In Drainage Piping In Buildings of Five Stories or More

Section PC 711: Offsets In Drainage Piping In Buildings of Five Stories or More 711.1 Horizontal branch connections above or below vertical stack offsets. If a horizontal branch connects to the stack within 2 feet (610 mm) above or below a vertical stack offset, and the offset is located more than four branch intervals below the top of the stack, the offset shall be vented in accordance with Section 907. 711.1.1 Omission of vents for vertical stack offsets. Vents for vertical offsets required by Section 711.1 shall not be required where the stack and its offset are sized as a building drain (see Table 710.1(1), Column 5). 711.2 Horizontal stack offsets. A stack with a horizontal offset located more than four branch intervals below the top of the stack shall be vented in accordance with Section 907 and sized as follows: 1. The portion of the stack above the offset shall be sized as for a vertical stack based on the total number of drainage fixture units above the offset. 2. The offset shall be sized in accordance with Section 710.1.1. 3. The portion of the stack below the offset shall be sized as for the offset or based on the total number of drainage fixture units on the entire stack, whichever is larger (see Table 710.1(2), Column 4). 711.2.1 Omission of vents for horizontal stack offsets. Vents for horizontal stack offsets required by Section 711.2 shall not be required where the stack and its offset are one pipe size larger than required for a building drain (see Table 710.1(1), Column 5) and the entire stack and offset are not less in cross- sectional area than that required for a straight stack plus the area of an offset vent as provided for in Section 907. 711.3 Offsets below lowest branch. Where a vertical offset occurs in a soil or waste stack below the lowest horizontal branch, a change in diameter of the stack because of the offset shall not be required. If a horizontal offset occurs in a soil or waste stack below the lowest horizontal branch, the required diameter of the offset and the stack below it shall be determined as for a building drain in accordance with Table 710.1(1).

NYC Plumbing Code § PC 712 Ejectors

Section PC 712: Ejectors 712.1 Building subdrains. Building subdrains that cannot be discharged to the sewer by gravity flow shall be discharged into a gas-tight covered and vented ejector pit/basin from which the liquid shall be lifted and discharged into the building gravity drainage system by automatic pumping equipment or other approved method. 712.2 Valves required. A check valve and a full open valve located on the discharge side of the check valve shall be installed in the pump or ejector discharge piping between the pump or ejector and the gravity drainage system. Access shall be provided to such valves. Such valves shall be located above the sump cover required by Section 712.1 or, where the discharge pipe from the ejector is below grade, the valves shall be accessibly located outside the sump below grade in an access pit with a removable access cover. 712.3 Ejector design. The ejector pit and discharge piping shall conform to the requirements of Sections 712.3.1 through 712.3.5. 712.3.1 Ejector pump. The ejector pump capacity and head shall be appropriate to anticipated use requirements. 712.3.2 Ejector pit. The ejector pit shall be not less than 18 inches (457 mm) in diameter and 24 inches (610 mm) in depth, unless otherwise approved. The pit shall be accessible and located such that all drainage flows into the pit by gravity. The ejector pit shall be constructed of tile, concrete, steel, plastic or other approved materials. The pit bottom shall be solid and provide permanent support for the pump. The ejector pit shall be fitted with a gas-tight removable cover that is installed flush with grade or floor level, or above grade or floor level. The cover shall be adequate to support anticipated loads in the area of use. The ejector pit shall be vented in accordance with Chapter 9. 712.3.3 Discharge pipe and fittings. Discharge pipe and fittings serving ejectors shall be constructed of materials in accordance with Sections 712.3.3.1 and 712.3.3.2 and shall be approved. 712.3.3.1 Materials. Pipe and fitting materials shall be in accordance with Table 702.1 and Table 702.2. 712.3.3.2 Ratings. Pipe and fittings shall be rated for the maximum system operating pressure and temperature. Pipe fitting materials shall be compatible with the pipe material. Where pipe and fittings are buried in the earth, they shall be suitable for burial. 712.3.4 Maximum effluent level. The effluent level control shall be adjusted and maintained to at all times prevent the effluent from rising to within 2 inches (51 mm) of the invert of the gravity drain inlet into the sump. 712.3.5 Waste pump and waste ejector connection to the drainage system. Pumps connected to the drainage system shall connect to a building drain, soil stack, waste stack or horizontal branch drain. Where the discharge line connects into horizontal drainage piping, the connection shall be made through a wye fitting into the top of the drainage piping and such wye fitting shall be located not less than 10 pipe diameters from the base of any soil stack, waste stack or fixture drain. 712.4 Sewage pumps and sewage ejectors. A sewage pump or sewage ejector shall automatically discharge the contents of the pit to the building drainage system downstream of the house trap. Exceptions: Macerating toilet systems that comply with ASME A112.3.4/CSA B45.9 and installed in accordance with the manufacturer's instructions. Macerating toilet systems shall be permitted to discharge to a horizontal drain or stack in accordance with Section 712.3.5. 712.4.1 Capacity. A sewage pump or sewage ejector shall have the capacity and head for the application requirements. Pumps or ejectors that receive the discharge of water closets shall be capable of handling spherical solids with a diameter of up to and including 2 inches (51 mm). Other pumps or ejectors shall be capable of handling spherical solids with a diameter of up to and including 1 inch (25 mm). The capacity of a pump or ejector based on the diameter of the discharge pipe shall be not less than that indicated in Table 712.4.1. Exceptions: 1. Grinder pumps or grinder ejectors that receive the discharge of water closets shall have a discharge opening of not less than 1 1/4 inches (32 mm). 2. Macerating toilet assemblies that serve single water closets shall have a discharge opening of not less than 3/4 inch (19.1 mm). Table 712.4.1 Minimum Capacity of Sewage Pump or Sewage Ejector Diameter of the Discharge Pipe (inches) Capacity of Pump or Ejector (gpm) 2 21 2 1/2 30 3 46 For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m.

NYC Plumbing Code § PC 713 Health Care Plumbing

Section PC 713: Health Care Plumbing 713.1 Scope. This section shall govern those aspects of health care plumbing systems that differ from plumbing systems in other structures. Health care plumbing systems shall conform to this section in addition to the other requirements of this code. The provisions of this section shall apply to the special devices and equipment installed and maintained in the following occupancies: nursing homes; homes for the aged; orphanages; infirmaries; first aid stations; psychiatric facilities; clinics; professional offices of dentists and doctors; mortuaries; educational facilities; surgery, dentistry, research and testing laboratories; establishments manufacturing pharmaceutical drugs and medicines; and other structures with similar apparatus and equipment classified as plumbing. 713.2 Bedpan washers and clinical sinks. Bedpan washers and clinical sinks shall connect to the drainage and vent system in accordance with the requirements for a water closet. Bedpan washers shall also connect to a local vent. 713.3 Indirect waste. Sterilizers, steamers and condensers shall discharge to the drainage through an indirect waste pipe by means of an air gap. Where a battery of not more than three sterilizers discharges to an individual receptor, the distance between the receptor and a sterilizer shall not exceed 8 feet (2438 mm). The indirect waste pipe on a bedpan steamer shall be trapped. 713.4 Vacuum system station. Ready access shall be provided to vacuum system station receptacles. Such receptacles shall be built into cabinets or recesses and shall be visible. 713.5 Bottle system. Vacuum (fluid suction) systems intended for collecting, removing and disposing of blood, pus or other fluids by the bottle system shall be provided with receptacles equipped with an overflow prevention device at each vacuum outlet station. 713.6 Central disposal system equipment. Central vacuum (fluid suction) systems shall provide continuous service. Systems equipped with collecting or control tanks shall provide for draining and cleaning of the tanks while the system is in operation. In hospitals, the system shall be connected to the emergency power system. The exhausts from a vacuum pump serving a vacuum (fluid suction) system shall discharge separately to open air above the roof. 713.7 Central vacuum or disposal systems. Where the waste from a central vacuum (fluid suction) system of the barometric-lag, collection-tank or bottle-disposal type is connected to the drainage system, the waste shall be directly connected to the sanitary drainage system through a trapped waste. 713.7.1 Piping. The piping of a central vacuum (fluid suction) system shall be of corrosion-resistant material with a smooth interior surface. A branch shall be not less than 1/2-inch (12.7 mm) nominal pipe size for one outlet and shall be sized in accordance with the number of vacuum outlets. A main shall be not less than 1-inch (25 mm) nominal pipe size. The pipe sizing shall be increased in accordance with the manufacturer's instructions as stations are increased. 713.7.2 Velocity. The velocity of airflow in a central vacuum (fluid suction) system shall be less than 5,000 feet per minute (25 m/s). 713.8 Vent connections prohibited. Connections between local vents serving bedpan washers or sterilizer vents serving sterilizing apparatus and normal sanitary plumbing systems are prohibited. Only one type of apparatus shall be served by a local vent. 713.9 Local vents and stacks for bedpan washers. Bedpan washers shall be vented to open air above the roof by means of one or more local vents. The local vent for a bedpan washer shall be not less than a 2-inch-diameter (51 mm) pipe. A local vent serving a single bedpan washer is permitted to drain to the fixture served. 713.9.1 Multiple installations. Where bedpan washers are located above each other on more than one floor, a local vent stack is permitted to be installed to receive the local vent on the various floors. Not more than three bedpan washers shall be connected to a 2-inch (51 mm) local vent stack, not more than six to a 3-inch (76 mm) local vent stack and not more than 12 to a 4-inch (102 mm) local vent stack. In multiple installations, the connections between a bedpan washer local vent and a local vent stack shall be made with tee or tee-wye sanitary pattern drainage fittings installed in an upright position. 713.9.2 Trap required. The bottom of the local vent stack, except where serving only one bedpan washer, shall be drained by means of a trapped and vented waste connection to the sanitary drainage system. The trap and waste shall be the same size as the local vent stack. 713.9.3 Trap seal maintenance. A water supply pipe not less than 1/4 inch (6.4 mm) in diameter shall be taken from the flush supply of each bedpan washer on the discharge or fixture side of the vacuum breaker, shall be trapped to form not less than a 3-inch (76 mm) water seal, and shall be connected to the local vent stack on each floor. The water supply shall be installed so as to provide a supply of water to the local vent stack for cleansing and drain trap seal maintenance each time a bedpan washer is flushed. 713.10 Sterilizer vents and stacks. Multiple installations of pressure and nonpressure sterilizers shall have the vent connections to the sterilizer vent stack made by means of inverted wye fittings. Access shall be provided to vent connections for the purpose of inspection and maintenance. 713.10.1 Drainage. The connection between sterilizer vent or exhaust openings and the sterilizer vent stack shall be designed and installed to drain to the funnel or basket-type waste fitting. In multiple installations, the sterilizer vent stack shall be drained separately to the lowest sterilizer funnel or basket-type waste fitting or receptor. 713.11 Sterilizer vent stack sizes. Sterilizer vent stack sizes shall comply with Sections 713.11.1 through 713.11.4. 713.11.1 Bedpan steamers. The minimum size of a sterilizer vent serving a bedpan steamer shall be 1 1/2 inches (38 mm) in diameter. Multiple installations shall be sized in accordance with Table 713.11.1. Table 713.11.1 Stack Sizes for Bedpan Steamers and Boiling-Type Sterilizers (Number of Connections of Various Sizes Permitted to Various-sized Sterilizer Vent Stacks) Stack Size (inches) Connection Size 1 1/2 2" 1 1/2 a 1 or 0 2 a 2 or 1 2 b 1 and 1 3 a 4 or 2 3 b 2 and 2 4 a 8 or 4 4 b 4 and 4 For SI: 1 inch = 25.4 mm. a. Total of each size. b. Combination of sizes. 713.11.2 Boiling-type sterilizers. The size of a sterilizer vent stack shall be not less than 2 inches (51 mm) in diameter where serving a utensil sterilizer and not less than 1 1/2 inches (38 mm) in diameter where serving an instrument sterilizer. Combinations of boiling-type sterilizer vent connections shall be sized in accordance with Table 713.11.1. 713.11.3 Pressure sterilizers. Pressure sterilizer vent stacks shall be 2 1/2 inches (64 mm) minimum. Those serving combinations of pressure sterilizer exhaust connections shall be sized in accordance with Table 713.11.3. Table 713.11.3 Stack Sizes for Pressure Sterilizers (Number of Connections of Various Sizes Permitted To Various-sized Vent Stacks) Stack Size (inches) Connection Size 3/4" 1" 1 1/4" 1 1/2" 1 1/2 a 3 or 2 or 1 — 1 1/2 b 2 and 1 — — 2 a 6 or 3 or 2 or 1 2 b 3 and 2 — — 2 b 2 and 1 and 1 — 2 b 1 and 1 and — 1 3 a 15 or 7 or 5 or 3 3 b 1 and 1 and 5 and 2 and 2 1 For SI: 1 inch = 25.4 mm. a. Total of each size. b. Combination of sizes. 713.11.4 Pressure instrument washer sterilizer sizes. The diameter of a sterilizer vent stack serving an instrument washer sterilizer shall be not less than 2 inches (51 mm). Not more than two sterilizers shall be installed on a 2-inch (51 mm) stack, and not more than four sterilizers shall be installed on a 3-inch (76 mm) stack.

NYC Plumbing Code § PC 714 Computerized Drainage Design

Section PC 714: Computerized Drainage Design 714.1 Design of drainage system. The sizing, design and layout of the drainage system shall be permitted to be designed by approved computer design methods. 714.2 Load on drainage system. The load shall be computed from the simultaneous or sequential discharge conditions from fixtures, appurtenances and appliances or the peak usage design condition. 714.2.1 Fixture discharge profiles. The discharge profiles for flow rates versus time from fixtures and appliances shall be in accordance with the manufacturer's specifications. 714.3 Selections of drainage pipe sizes. Pipe shall be sized to prevent full-bore flow. 714.3.1 Selecting pipe wall roughness. Pipe size calculations shall be conducted with the pipe wall roughness factor (ks), in accordance with the manufacturer's specifications and as modified for aging roughness factors with deposits and corrosion. 714.3.2 Slope of horizontal drainage piping. Horizontal drainage piping shall be designed and installed at slopes in accordance with Table 704.1.

NYC Plumbing Code § PC 715 Backwater Valves

Section PC 715: Backwater Valves 715.1 Sewage backflow. Where fixtures, floor drains, or area drains are subject to overflow as the result of backwater from the public sewer system, accessible backwater valves shall be installed in the fixture drain pipe from such fixture, in the branch drain to such area drain or group of fixtures, or in the building drain at its point of exit from the building and downstream from the building trap. Buildings located in flood hazard areas shall be deemed to be subject to overflow as the result of backwater from the public sewer system and shall be provided with backwater valves in accordance with the additional requirements of Section 7.3.3 of ASCE 24 as modified by Appendix G of the New York City Building Code. 715.2 Material. Bearing parts of backwater valves shall be of corrosion-resistant material. Backwater valves shall comply with ASME A112.14.1, CSA B181.1 or CSA B181.2. 715.3 Seal. Backwater valves shall be so constructed as to provide a mechanical seal against backflow. The flap shall be so designed as to hang partially open when not subject to backwater pressure. 715.4 Diameter. Backwater valves, when fully opened, shall have a capacity not less than that of the pipes in which they are installed. 715.5 Accessibility. Backwater valves shall be installed so that access is provided to the working parts for service and repair. Masonry access manholes shall be provided when the centerline of any drain line is 18 inches (457 mm) or more below a slab on grade.

Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-162437Fetched: 10/24/2026