Plumbing piping shall be supported in accordance with this section.
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 International Building Code.
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.
Hangers and anchors shall be attached to the building construction in an approved manner.
Pipe shall be supported in accordance with Table 308.5.
Exception: The interval of support for piping systems designed to provide for expansion/contraction shall conform to the engineered design in accordance with Section 316.1.
TABLE 308.5 HANGER SPACING
Exception: The interval of support for piping systems designed to provide for expansion/contraction shall conform to the engineered design in accordance with Section 316.1.
TABLE 308.5 HANGER SPACING
| PIPING MATERIAL | MAXIMUM HORIZONTAL SPACING (feet) | MAXIMUM VERTICAL SPACING (feet) |
| Acrylonitrile butadiene styrene (ABS) pipe | 4 | 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,11/4 inches and larger | 4 | 10b |
| Copper or copper-alloy pipe | 12 | 10 |
| Copper or copper-alloy tubing, 11/4-inch diameter and smaller | 6 | 10 |
| Copper or copper-alloy tubing, 11/2-inch diameter and larger | 10 | 10 |
| Cross-linked polyethylene (PEX) pipe | 2.67 (32 inches) | 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 | 2.67 (32 inches) | 10b |
| Polypropylene (PP) pipe or tubing 1 inch and smaller | 2.67 (32 inches) | 10b |
| Polypropylene (PP) pipe or tubing, 11/4 inches and larger | 4 | 10b |
| Polyvinyl chloride (PVC) pipe | 4 | 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. |
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.
Anchorage shall be provided to restrain drainage piping from axial movement.
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.
Piping bundles for manifold systems shall be supported in accordance with Table 308.5.Support at changes in direction shall be in accordance with the manufacturer's instructions. Where hot water piping is bundled with cold or hot water piping, each hot water pipe shall be insulated.