SECTION P-308  PIPING SUPPORT
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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
4c
10b
Aluminum tubing
10
15
Brass pipe
10
10
Cast-iron pipe
5a
15
Chlorinated polyvinyl chloride (CPVC) pipe and tubing, 1 inch and smaller
3
10b
Chlorinated polyvinyl chloride (CPVC) pipe and tubing, 1-1/4 inches and larger
4c
10b
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)
10b
Cross-linked polyethylene (PEX) pipe 1-1/4 inch and larger
4c
10b
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)
10b
Polyethylene of raised temperature (PE-RT) pipe 1-1/4 inch and larger
4c
10b
Polypropylene (PP) pipe or tubing 1 inch and smaller
2.67
(32 inches)
10b
Polypropylene (PP) pipe or tubing, 1-1/4 inches and larger
4c
10b
Polyvinyl chloride (PVC) pipe
4c
10b
Stainless steel drainage systems
10
10b
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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