PIPING SUPPORT
Philadelphia Code Subcode P, § 308
in effectSECTION 308 PIPING SUPPORT
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P-308.3 Materials. Hangers, anchors and supports shall support the piping and the contents of the piping. Hangers and strapping material shall be of approved material that will not promote galvanic action.
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TABLE P-308.5
HANGER SPACING
PIPING MATERIAL | MAXIMUM HORIZONTAL SPACING (feet) | MAXIMUM VERTICAL SPACING (feet)
PIPING MATERIAL | MAXIMUM HORIZONTAL SPACING (feet) | MAXIMUM VERTICAL SPACING (feet)
Acrylonitrile butadiene styrene (ABS) pipe | 4 c | 10 b
Aluminum tubing | 10 | 15
Brass pipe | 10 | 10
Cast-iron pipe | 5 a | 15
Chlorinated polyvinyl chloride (CPVC) pipe and tubing, 1 inch and smaller | 3 | 10 b
Chlorinated polyvinyl chloride (CPVC) pipe and tubing, 1-1/4 inches and larger | 4 c | 10 b
Copper or copper-alloy pipe | 12 | 10
Copper or copper-alloy tubing, 1-1/4 inch diameter and smaller | 6 | 10
Copper or copper-alloy tubing, 1-1/2 inch diameter and larger | 10 | 10
Cross-linked polyethylene (PEX) pipe 1 inch and smaller | 2.67 (32 inches) | 10 b
Cross-linked polyethylene (PEX) pipe 1-1/4 inch and larger | 4 c | 10 b
Cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) pipe | 2.67 (32 inches) | 4
Lead pipe | Continuous | 4
Polyethylene/aluminum/polyethylene (PE-AL-PE) pipe | 2.67 (32 inches) | 4
Polyethylene of raised temperature (PE-RT) pipe 1 inch and smaller | 2.67 (32 inches) | 10 b
Polyethylene of raised temperature (PE-RT) pipe 1-1/4 inch and larger | 4 c | 10 b
Polypropylene (PP) pipe or tubing 1 inch and smaller | 2.67 (32 inches) | 10 b
Polypropylene (PP) pipe or tubing, 1-1/4 inches and larger | 4 c | 10 b
Polyvinyl chloride (PVC) pipe | 4 c | 10 b
Stainless steel drainage systems | 10 | 10 b
Steel pipe | 12 | 15
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
a. The maximum horizontal spacing of cast-iron pipe hangers shall be increased to 10 feet where 10-foot lengths of pipe are installed.
b. For sizes 2 inches and smaller, a guide shall be installed midway between required vertical supports. Such guides shall prevent pipe movement in a direction perpendicular to the axis of the pipe.
c. The maximum horizontal spacing of hangers shall be decreased to 3 feet where temperatures exceed 120 degrees Fahrenheit.
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Source: City of Philadelphia, The Philadelphia Code and Home Rule Charter (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/philadelphia/latest/philadelphia_pa/0-0-0-270749Fetched: 10/27/2026