18-29-604.9.1 Air chambers.

   An air chamber that is installed in a fixture supply shall be 12 inches (304.8 mm) in length and the same diameter as the fixture supply, or an air chamber with an equivalent volume may be used. An air chamber that is installed in a riser shall be 12 inches (304.8 mm) in length and at least the same diameter as the riser.

(Added Coun. J. 12-14-22, p. 58278, Art. VI, § 9)

18-29-604.10 Size of water supply pipes.

   Each main supply pipe, principal supply pipe, branch supply pipe, riser pipe, distributing pipe, or branch distributing pipe shall be sized in accordance with this section.

(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 13)

18-29-604.10.1 Minimum sizes of branch distributing pipes for fixtures and appliances.

   The water supply system shall be designed on the basis of the minimum available pressure at the water main or other source of water supply. The minimum available pressure will be given by the department of water management for each location.

(Amend Coun. J. 11-8-12, p. 38872, § 350)

18-29-604.10.1.1 Demand load.

   The water supply demand load in the distributing system shall be based upon the number, type, and probable simultaneous use of the fixtures to be supplied.

18-29-604.10.1.2 Size of piping.

   The size of piping shall be such that the velocity of each flow during maximum domestic demand will not exceed 8 feet per second (2.44 m/s).

(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 13)

18-29-604.10.1.3 Available pressure.

   In determining the available pressure to overcome friction in the piping system, head meter and other losses shall be deducted from the minimum available pressure source. When the pressure exceeds 100 psi (690 kPa) at any plumbing fixture, the pressure shall be reduced by an approved type reducing valve. The minimum size of fixture supply pipes are shown in Table 18-29-604.5.

18-29-604.10.2 Procedures for calculating sizing.

   See Appendix A for procedures for sizing of the water supply system.