1323.4 Pipe Support — 2025 California Plumbing Code

Piping shall be supported from the building structure. [NFPA 99:5.1.10.11.4.1] 1323.4.1 Hangers and Supports. Hangers and supports shall comply with and be installed in accordance with MSS SP-58. [NFPA 99:5.1.10.11.4.2] 1323.4.2 Copper Tube. Supports for copper tube shall be sized for copper tube. [NFPA 99:5.1.10.11.4.3] 1323.4.3 Damp Locations. In potentially damp locations, copper tube hangers or supports that are in contact with the tube shall be plastic-coated or otherwise be electrically insulated from the tube by a material that will not absorb moisture. [NFPA 99:5.1.10.11.4.5] 1323.4.4 Maximum Spacing. Maximum support spacing shall be in accordance with Table 1323.4.4.

[NFPA 99:5.1.10.11.4.6]

TABLE 1323.4.4

MAXIMUM PIPE SUPPORT SPACING

[NFPA 99: TABLE 5.1.10.11.4.6]

PIPE SIZE			HANGER SPACING (feet)
DN8	(NPS1⁄4)	(3⁄8 of an inch O.D.)	5
DN10	(NPS3⁄8)	(1⁄2 of an inch O.D.)	6
DN15	(NPS1⁄2)	(5⁄8 of an inch O.D.)	6
DN20	(NPS3⁄4)	(7⁄8 of an inch O.D.)	7
DN25	(NPS 1)	(11⁄8 of an inch O.D.)	8
DN32	(NPS 11⁄4)	(13⁄8 of an inch O.D.)	9
DN40 and larger	(NPS 11⁄2)	(15⁄8 of an inch O.D.)	10
Vertical risers, all sizes, every floor, but not to exceed	Vertical risers, all sizes, every floor, but not to exceed	Vertical risers, all sizes, every floor, but not to exceed	15

For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

1323.4.5 Seismic Provisions. Where required, medical gas and vacuum piping shall be seismically restrained against earthquakes in accordance with the applicable building code. [NFPA 99:5.1.10.11.4.7]