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  1. Hangers and anchors shall be securely attached to the building construction at sufficiently close intervals to support the piping and its contents.
  2. Fixtures, appliances and equipment shall be connected to support the weight of the device and any additional probable loads that may impact on the device.
  3. Fixtures shall be rigidly supported so that no strain is transmitted in the piping connections.
  1. Vertical piping of the following materials shall be supported according to manufacturer's recommendations, but at no greater than the distances listed below:
    1. Cast-iron soil pipe—at base and at each story height not to exceed 15 feet.
    2. Steel threaded pipe—at every other story height.
    3. Copper tube—at each story height but not more than 10-foot intervals.
    4. Lead pipe—four-foot intervals.
    5. Plastic pipe—see Section 8.7.
    6. Flexible plastic tubing—each story height and at mid-story.
    7. Stainless steel drainage pipe—at each story height.
  1. Horizontal piping of the following materials shall be supported according to manufacturer's recommendations, but at no greater than the distances listed below:
    1. Cast-iron soil pipe—minimum of one hanger per pipe length located within 18 inches of each joint (up to 10-foot maximum pipe length), at changes in direction, and at branch connections. Where pipe is suspended by non-rigid hangers more than 18 inches long, provide lateral support at 40-foot maximum spacing for pipe sizes 5 inches and larger. Lateral support shall consist of either 1) a sway brace or 2) either a change in direction or a branch connection that provides the required lateral support.
    2. Steel threaded pipe—3/4 inch size and smaller—10-foot intervals. One-inch size and larger—12-foot intervals.
    3. Copper tube (1-1/4 inch size and smaller)—6-foot intervals.
    4. Copper tube (1-1/2 inch size and larger)—10-foot intervals.
    5. Lead pipe—on continuous metal or wood strips for its entire length.
    6. Plastic pipe—see Section 8.7.
    7. Flexible plastic tubing—32 inches.
    8. Stainless steel drainage pipe—10-foot intervals, changes of direction and branch connections.
  1. Hangers, anchors, and supports shall be of metal or other material of sufficient strength to support the piping and its contents.
  2. Piers shall be of concrete, brick, or other masonry construction.
  1. Piping in the plumbing system shall be installed and supported so as to prevent strains and stresses that will exceed the allowable stresses for the pipe.
  2. Provisions shall be made for expansion and contraction of the piping material installed. See Sections 4.1.3 and 4.2.16.
  3. Pipe guides shall be provided on each side of expansion loops and expansion compensators. Pipe guides shall be located in accordance with the manufacturer's instructions for the pipe guides and expansion compensators.
See Figure 8.5-A, 8.5-B, and 8.5-C
Figure 8.5 - A
AN EXPANSION LOOP IN A HOT WATER PIPE LINE
Figure 8.5 - B
AN EXPANSION COMPENSATOR IN A HOT WATER PIPE LINE
Figure 8.5 - C
A FLEXIBLE EXPANSION LOOP TO ABSORB THERMAL EXPANSION
Bases of cast-iron stacks shall be supported on concrete, brick laid in cement mortar, metal brackets attached to the building construction, or by other methods approved by the Authority Having Jurisdiction. Other piping material shall be so anchored as to support the stack at the base.
  1. Plastic drain, waste, vent, and pressure pipe shall be installed and supported as recommended by the manufacturer's instructions.
  2. Maximum horizontal support spacing shall be based on the pipe schedule or wall thickness, the pipe size, the system operating temperature, the ambient temperature, and any concentrated loads.
  3. Vertical pipe shall be maintained in straight alignment with supports at each story height. Intermediate supports shall be provided where required for stability.
  4. Pipe shall also be supported at changes of direction or elevation.
  5. Supports shall not compress, distort, cut, or abrade the piping and shall allow free movement.
  6. Provisions shall be made for expansion and contraction of the piping.
  7. Fixture trap arms longer than three feet shall be supported as close as possible to the trap.
Where earthquake loads are applicable in accordance with the adopted building code, plumbing piping supports shall be designed and installed for the seismic forces in accordance with the adopted building subcode.
In lieu of the pipe hanger and support spacing required by Section 8.2 for vertical piping and Section 8.3 for horizontal piping, the pipe support spacing shall be permitted to comply with MSS SP-58 and the pipe manufacturer's recommendations. The spacing for water piping, waste and sanitary drain piping, and storm water piping shall be based on full water. The spacing for vent piping shall be permitted to be based on full vapor.
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