SECTION P-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.  347

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TABLE P-308.5
HANGER SPACING

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	4c	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	4c	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	4c	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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Notes

347	Amended, Bill No. 230653 (approved December 20, 2023), effective April 1, 2024.