Sec. 25-19. - Minimum specifications for polyvinyl chloride (PVC) water and sewer pipe to be used in city.
(a) Water system. At a minimum, all design and construction associated with the city's potable water system shall adhere to the applicable section(s) of MSDH's Minimum Design Criteria for Mississippi Public Water Systems. Any pipe material not specifically referenced in this section shall be non-toxic and approved for use in potable water systems by the latest standards issued by AWWA, U.S. EPA, ASTM, Underwriters Laboratory, ANSI/NSF, or other appropriate organization. Furthermore, it shall be unlawful for any person, firm or corporation to use or install any polyvinyl chloride (PVC) water pipe for the transportation of potable water in the city which does not meet or exceed the following minimum specifications:
(1) Polyvinyl chloride (PVC) water pipe:
a. Scope: This specification covers the furnishing and installation of PVC pressure pipe in nominal diameters four (4) inches through twelve (12) inches for potable water distribution projects as designated on project drawings.
b. Pipe: The pipe shall be fabricated in accordance with AWWA C900 standards latest revision, "Standard for Polyvinyl Chloride (PVC) Pressure Pipe, 4 Inches Through 12 Inches, for Water Distribution". All PVC pipe shall be a minimum pressure class of one hundred fifty (150) with cast iron pipe equivalent outside diameters unless otherwise indicated.
c. Joints: Shall be gasket, push-on type conforming to AWWA C900 and to the pipe design. Lubricant shall be as recommended by the pipe manufacturer and shall not adversely affect the potable qualities of the water to be transported.
d. Markings: All PVC pipe shall be clearly marked in accordance with AWWA C900. Intervals shall not exceed five (5) feet.
e. Approvals: PVC water pipe shall be approved by the National Sanitation Foundation (NSF), Underwriters Laboratory (UL), and Factory Mutual (FM).
f. Tests and reports: The contractor shall provide tests and reports duly certified by the manufacturer's testing facility or an approved testing laboratory of full compliance with AWWA Standard C900. Pipe may be rejected for failure to comply with any requirements of this specification.
(2) Polyvinyl chloride (PVC) water pipe design and installation:
a. Pressure class: All PVC water pipe shall have a pressure class (PC) rating of the minimum static pressure that exceeds by ten (10) percent the anticipated working pressure for the pipe section being designed or replaced. "Working pressure" is defined as the maximum sustained operating pressure.
The pressure class (PC) ratings listed in AWWA C900 provide a minimum allowance for surge pressure based on an instantaneous velocity change of two (2) fps. If surge pressures are expected to be of greater magnitude, an additional allowance shall be made by reducing the pipe's marked PC rating accordingly. (Refer to AWWA C900, Appendix A-"AWWA Design Requirements and Criteria for PVC Water Pipe.")
b. Embedment requirements: The embedment requirements for PVC water pipe shall be in accordance with AWWA C900, Appendix A.6, "Installation." Minimum depth of cover for un-encased water pipe shall be thirty (30) inches.
c. Service connections: All service connections to PVC water pipe shall be made with tapping sleeve or saddle in accordance with the recommendations of AWWA No. M23, "PVC Pipe-Design and Installation."
(3) Polyvinyl chloride (PVC) water pipe post-installation test requirement:
a. Pressure and leakage: A simultaneous pressure and leakage test shall be performed on the installed system. No installation will be accepted if the leakage is greater than that determined by the formula:
L = N×D×P 0.5
7,400
in which: L = the allowable leakage, (in gallons per hour); N = number of joints in the length of pipeline tested; D = normal diameter of the pipe (in inches); and P = average test pressure during the test (in pounds per square inch gauge).
The duration of each test shall be two (2) hours, unless otherwise specified. During the test, the main shall be subjected to a pressure equal to one hundred fifty (150) percent of the anticipated normal working pressure at the point of test, but not less than one hundred twenty-five (125) percent of the normal working pressure at the highest elevation or a minimum testing pressure of one hundred (100) psi. All test procedures shall be in accordance with Section 4, "Hydrostatic Testing" of AWWA Standard C600.
b. Disinfection: Upon completion of the system or any part thereof, the contractor shall flush the system until all foreign material is removed and disinfect such system with chlorine in accordance with the MSDH requirements. It will be the responsibility of the contractor to coordinate the disinfection and sampling with the MSDH, and the system will not be deemed acceptable until the engineer receives notification from the MSDH that the system is free of organisms and material. Test procedures shall conform to AWWA Standard C601.
(b) All design associated with the city's sewer system should adhere, at a minimum, to the applicable section(s) of MDEQ's Guidance for the Design of Publicly Owned Wastewater Facilities and follow generally accepted industry-standards governing sewer system design and construction. It shall be unlawful for any person, firm or corporation to use or install any polyvinyl chloride (PVC) or other material sewer pipe for the transportation of sewage in the city which does not meet or exceed the following minimum specifications:
(1) Thermoplastic gravity sewer pipe and fittings:
a. Scope: This material specification covers the furnishing and installation of thermoplastic sewer pipe for use in sanitary sewer projects as designed on project drawings. Generally, the standard sewer system pipe material is PVC in nominal diameters four (4) inches through fifteen (15) inches for type PSM, and eighteen (18) inches through sixty (60) inches for large diameter. HOPE sewer pipe, in nominal diameters of four (4) inches through eighteen (18) inches may also be acceptable, based on the project drawings and specifications.
b. Gravity pipe: Gravity sewer pipe shall be manufactured in accordance with one (1) of the following standard specifications:
1. ASTM D3034 "Standard Specification for Type PSM Polyvinyl Chloride (PVC) Sewer Pipe and Fittings."
2. ASTM F679 "Standard Specification for Polyvinyl Chloride (PVC) Large-Diameter Plastic Gravity Sewer Pipe and Fittings."
3. ASTM F1803 "Standard Specification for Polyvinyl Chloride) (PVC) Closed Profile Gravity Pipe and Fittings Based on Controlled Inside Diameter."
4. PVC gravity sewer pipe and fittings shall be certified by the manufacturer as complying with the standards listed in the following table, as in effect when the pipes were manufactured:
Gravity Sewer PVC Pipe Minimum Standards
ASTM Standard | Wall Type | Diameter Range | Performance Designation*
D3034 | Solid Wall PVC | 8"—15" | SOR 26: PS=115
F679 | Solid Wall PVC | 18"—60" | PS=115; 75; 46
F1803 | Closed Profile PVC | 18"—60" | PS=46
* Performance Designations (minimum); SOR - Standard Dimensional Ratio; PS - Pipe Stiffness (in psi)
c. Joints: All pipe joints shall be gasket, bell, and spigot, push-on type conforming to ASTM D3212, "Standard Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals" and the pipe design. Lubricant shall be as recommended by the pipe manufacturer.
d. Fittings: Fittings for gravity sewer pipe shall be fabricated or molded from material meeting the respective ASTM pipe standard. The wall thickness of the waterway and bell of molded fittings shall be no less than the respective minimum thicknesses for the equivalent pipe. All fittings shall be compatible with the pipe to which they are attached.
e. Markings: All pipe shall be clearly marked at intervals not to exceed five (5) feet in accordance with the applicable ASTM standard specification as may be required or appropriate.
f. Test and reports: The contractor shall provide the reports duly certified by the manufacturer's testing facility or an approved testing laboratory of full compliance with the applicable ASTM standard specification, as may be required or appropriate. Pipe may be rejected for failure to comply with any requirement of this specification.
(2) Thermoplastic force main/pressure sewer pipe and fittings:
a. Scope: This material specification covers the furnishing and installation of thermoplastic sewer pipe for use in force main sewer projects as designed on project drawings. Generally, the standard sewer system pipe material is PVC in nominal diameters four (4) inches through twelve (12) inches. Additional sizes may also be acceptable based on the project drawings and specifications.
b. Force main pipe: Sanitary sewer force main/pressure pipe shall be manufactured in accordance with one (1) of the following standard specifications:
1. ASTM D2241 "Standard Specification for Polyvinyl Chloride (PVC) Pressure Rated Pipe (SOR Series)".
c. Joints: All pipe joints shall be gasket, bell, and spigot, push-on type conforming to ASTM D3139 "Standard Specification for Joints for Plastic Pressure Pipes Using Flexible Elastomeric Seals" and ASTM F477 "Standard Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe".
d. Fittings: Fittings for force main sewer pipe shall be fabricated or molded from material meeting the respective ASTM pipe standard. All fittings must be designed to the required pressure class of the adjoining pipe. All fittings shall be compatible with the pipe to which they are attached and be as recommended by the pipe manufacturer.
e. Markinqs: All pipe shall be clearly marked at intervals not to exceed five (5) feet in accordance with the applicable ASTM standard specification as may be required or appropriate.
f. Test and reports: The contractor shall provide the reports duly certified by the manufacturer's testing facility or an approved testing laboratory of full compliance with the applicable ASTM standard specification, as may be required or appropriate. Pipe may be rejected for failure to comply with any requirement of this specification.
(3) Alternative sewer pipe and fittings material types:
a. Generally, unless otherwise specified in the design drawings and specifications, PVC pipe shall be the default material used for design associated with the city's WCTS.
b. The basis for considering alternative material for WCTS pipe and fittings shall be dependent upon design parameters as determined by the design engineer. Accordingly, the use of alternative material will be evaluated with respect to the key pipe characteristics such as, but not limited to, corrosion resistance (interior and exterior), the scouring factor, leak tightness, and the hydraulic characteristics.
c. If an alternative pipe material is selected, all generally accepted industry standards governing sewer system design and installation shall be satisfied, including pipe and fittings manufacturing standards. In the absence of generally accepted standards, the design engineer shall provide complete pipe and installation specifications developed on the basis of criteria adequately documented and certified in writing by the pipe manufacturer to be satisfactory for the specific detailed plans.
(4) Sewer pipe design and installation requirements:
a. Pipe stiffness: The standard dimension ratio (SDR) for nominal four-inch through fifteen-inch will be SDR 26. All sewer piping shall have stiffness that equals or exceeds one hundred fifteen (115) psi.
b. Permitted uses: Sewer pipe material should be adapted to local conditions, such as: character of industrial wastes, possibility of septicity, soil characteristics, exceptionally heavy external loadings, abrasion, corrosion and similar problems.
c. Embedment requirements: The method for calculating loads and determining embedment requirements for sewer pipe shall be in accordance with the latest published edition of the applicable standards, including the following: ASCE Manual No. 60/WEF Manual FD-5, "Gravity Sanitary Sewer Design and Construction;" ASTM D2321; ASTM D2774; the pipe manufacturers' installation guides; and AWWA C605. Generally, no thermoplastic sewer pipe may be installed at a depth of cover less than three (3) feet or more than twenty (20) feet, except as in the case of written approval from the director or other duly authorized personnel of the public works department.
(5) Sewer pipe post-installation performance test requirements: So as to ensure conformance with the prescribed ASTM or equivalent applicable standards, prior to substantial completion, the contractor shall be responsible for conducting field-testing of the installed sewer pipes and appurtenances, which may include the following:
a. Leakage: All sewers shall be tested for excessive leakage. Testing shall, at a minimum, satisfy the requisites as described in MDEQ's Guidance for the Design of Publicly Owned Wastewater Facilities. Any pipe which fails the test for excessive leakage shall be replaced by the contractor at no additional cost to the city.
b. Deflection: After completion of the backfill, the engineer may require that a deflection test be performed. Any pipe which fails the test for excessive deflection shall be replaced or repaired by the contractor at no additional cost to the city. Deflection tests may be conducted using the mandrel testing method in accordance with the process described in ASTM D3034. The rigid mandrel shall have an outside diameter sized to permit no more deflection than authorized by the state regulatory agency. The percentage of deflection shall be established from the base inside diameter of the pipe. The mandrel shall be approved by the engineer prior to use.
(Ord. No. 3706, §§ 1, 2, 4, 2-5-85; Ord. No. 3955, § 17, 5-18-93; Ord. No. 4194, 9-18-01; Ord. No. 4575, 6-20-23)