7.3.4.5.Support for Horizontal Piping

(1) Nominally horizontal piping that is inside a building shall be braced to prevent swaying and buckling and to control the effects of thrust. (2) Nominally horizontal piping shall be supported as stated in Table 2.3.4.5. (3) Where PVC, CPVC or ABS plastic pipe is installed, (a) the pipe shall be aligned without added strain on the piping, (b) the pipe shall not be bent or pulled into position after being welded or joined, and (c) hangers shall not compress, cut or abrade the pipe. (4) Where PEX, PE-RT, PP-R, PE/AL/PE or PEX/AL/PEX plastic pipe or tube is installed, hangers shall not compress, cut or abrade the pipe. (5) Where hangers are used to support nominally horizontal piping, the hangers shall be (a) supported by metal rods of not less than (i) 6 mm diam to support piping of NPS 2 or less, (ii) 8 mm diam to support piping of NPS 4 or less, and (iii) 13 mm diam to support piping over NPS 4, or (b) solid or perforated metal straps not less than (i) 0.6 mm thick and 12 mm wide to support piping of NPS 2 or less, and (ii) 0.8 mm thick and 18 mm wide to support piping of NPS 4 or less. (6) Where a hanger is attached to concrete or masonry, it shall be fastened by metal or expansion-type plugs that are inserted or built into the concrete or masonry. Table 7.3.4.5. Support for Nominally Horizontal Piping Forming Part of Sentence 7.3.4.5.(2) Maximum Horizontal Spacing Piping Material Additional Support Conditions of Supports, m At the end of branches or fixture drains and ABS or PVC plastic pipe 1.2 at changes in direction and elevation ABS or PVC plastic trap arm or fixture drain pipe > 1 m n/a As close as possible to the trap long Cast-iron pipe 3.0 At or adjacent to each hub or joint Cast-iron pipe with mechanical joints that is ≤ 300 mm 1.0 None long between adjacent fittings Copper tube or copper and brass pipe, hard temper • diameter > NPS 1 3.0 • diameter ≤ NPS 1 2.5 None Copper tube, soft temper 2.5 None CPVC pipe 1.0 None Galvanized iron or steel pipe • diameter ≥ NPS 6 3.75 • diameter < NPS 6 2.5 None Lead pipe Throughout length of pipe None PE/AL/PE composite pipe 1.0 None PEX/AL/PEX composite pipe 1.0 None PEX plastic pipe 0.8 None PE-RT tube 0.8 None At the end of branches and at changes PP-R plastic pipe 1.0 in direction and elevation Stainless steel pipe • diameter ≥ NPS 1 3.0 • diameter < NPS 1 2.5 None Stainless steel tube • diameter ≥ NPS 1 3.0 • diameter < NPS 1 2.5 None