18-28-305 Piping Support.

18-28-305.1 General.

   All mechanical system piping shall be supported in accordance with the requirements of this section.

18-28-305.2 Materials.

   Pipe hangers and supports shall have sufficient strength to withstand all anticipated static and specified dynamic loading conditions associated with the intended use. Pipe hangers and supports that are in direct contact with piping shall be constructed of materials that are compatible with the piping and do not promote galvanic action.

18-28-305.3 Structural attachment.

   Hangers and anchors shall be attached to the building construction in an appropriate manner consistent with load requirements and manufacturer's recommendations.

18-28-305.4 Interval of support.

   Piping shall be either supported at distances not exceeding the spacing specified in Table 18-28-305.4, Piping Support Spacing.

Table 18-28-305.4
Piping Support Spacing a

Piping Material	Max. Horiz. Spacing (feet)	Max. Verti. Spacing (feet)
ABS pipe	4	10 c
Aluminum pipe and tubing	10	15
Brass pipe	10	10
Brass tubing, 1 1/4-inch diameter and smaller	6	10
Brass Tubing, 1 1/2-inch diameter and larger	10	10
Cast-iron pipe b	5	15
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
CPVC pipe or tubing, 1 inch and smaller	3	10 c
CPVC pipe or tubing, 1 1/4-inch and larger	4	10 c
Steel Pipe	12	15
Steel Tubing	8	10
Lead pipe	Continuous	4
PB pipe or tubing	2 2/3 (32 in.)	4
PEX Tubing	2 2/3 (32 in.)	10 c
PVC pipe	4	10 c

 

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

a See Section 18-28-301.14.

b The maximum horizontal spacing of cast-iron pipe hangers shall be increased to 10 feet where 10-foot lengths of pipe are installed.

c Mid-story guide.

18-28-305.5 Sway bracing.

   Rigid support sway bracing shall be provided at changes in direction greater than 45 degrees (0.8 rad) for pipe sizes 4 inches (102 mm) and larger.