N.Y.C. Admin. Code § PC 308: Section PC 308: Piping Support

308.1 General.

Plumbing piping shall be supported in accordance with this section.

308.2 Piping seismic supports.

Where earthquake loads are applicable in accordance with the building code, plumbing piping supports shall be designed and installed for the seismic forces in accordance with the New York city building code.

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.

308.4 Structural attachment.

Hangers and anchors shall be attached to the building construction in an approved manner.

308.5 Interval of support.

Pipe shall be supported in accordance with Table 308.5.

Table 308.5 Hanger Spacing

Piping Material

Maximum Horizontal Spacing (feet)

Maximum Vertical Spacing (feet)

Acrylonitrile butadiene styrene (ABS) pipe

4

10

b

Brass pipe

10

10

Cast-iron pipe

5

a

At base and at each story height no greater than 20

Copper or copper-alloy pipe

12

At each story height no greater than 12

Copper or copper-alloy tubing, 1 1/4-inch diameter and smaller

6

At each story height no greater than 10

Copper or copper-alloy tubing, 1 1/2-inch diameter and larger

10

At each story height no greater than 10

Polyvinyl chloride (PVC) pipe

4

10

b

Stainless steel drainage systems

10

10

b

Steel pipe

12

At base and at each story height no greater than 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.

308.5.1 No-hub type cast iron soil pipe, fittings, and couplings.

Intervals of support for no-hub cast iron soil pipe, fittings, and couplings shall comply with CISPI 310.

308.5.2 Movement.

Piping systems and supports shall be designed to account for thermal expansion and contraction, building movement, and seismic conditions.

308.6 Sway bracing.

Rigid support sway bracing shall be provided at changes in direction greater than 45 degrees (0.79 rad) for pipe sizes 4 inches (102 mm) and larger.

308.6.1 No-hub type cast iron soil pipe, fittings, and couplings.

Installation of sway bracing for no-hub cast iron soil pipe, fittings, and couplings shall comply with CISPI 310.

308.7 Anchorage.

Anchorage shall be provided to restrain drainage piping from axial movement.

308.7.1 Location.

For pipe sizes greater than 4 inches (102 mm), restraints shall be provided for drain pipes at all changes in direction and at all changes in diameter greater than two pipe sizes. Braces, blocks, rodding and other suitable methods as specified by the coupling manufacturer shall be utilized.

308.8 Expansion joint fittings.

Expansion joint fittings shall be used only where necessary to provide for expansion and contraction of the pipes. Expansion joint fittings shall be of the typical material suitable for use with the type of piping in which such fittings are installed.