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The minimum size of individual distribution lines utilized in parallel water distribution systems shall be as shown in Table 18-29-604.5.
Wherever water pressure from the street main or other source of supply is insufficient to provide flow pressures at fixture outlets as required under Section 18-29-604.3, a water pressure booster system conforming to Section 18-29-606.5 shall be installed on the building water supply system.
Where water pressure within a building exceeds 100 psi (690 kPa) static at any fixture or outlet, an approved water pressure reducing valve conforming to ASSE 1003 with strainer shall be installed to reduce the pressure at any fixture or outlet in the building water distribution piping to 100 psi (690 kPa) static or less.
The flow of velocity of the water distribution system shall be controlled to reduce the possibility of water hammer. An air chamber or water-hammer arrestor shall be installed where quick-closing valves are utilized. Water-hammer arrestors shall be installed in accordance with the manufacturer's instructions. Water-hammer arrestors shall conform to ASSE 1010. Air chambers shall comply with Section 18-29-604.9.1.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 12; Amend Coun. J. 12-14-22, p. 58278, Art. VI, § 9; Amend Coun. J. 4-19-23, p. 62477, § 1)
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)
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