3125B Recirculation Piping System and Components — 2025 California Building Code

Pipes shall be sized so flow velocity of piping systems including all pipes and fittings other than inlet devices or venturi throats shall not exceed 6 feet per second (1.829 m/s) in any suction or copper piping and 8 feet per second (2.438 m/s) in any portion of the return system.

3125B.1.1 Materials. All piping, tubing and fittings shall comply with the applicable standards for potable water system materials set forth in Chapter 6 of the California Plumbing Code.

A pressure and vacuum gauge shall be provided for each pump system. Each gauge shall have a scale range approxi- mately 1 1/4 times the maximum anticipated working pressure or vacuum and shall be accurate within 2 percent of scale. The pressure gauge located on the filter shall be marked with the clean start up pressure reading.

A flow meter shall be provided on each recirculation system accurate to within 10 percent of flow and installed according to the manufacturer’s written instructions with increments in the range of normal flow.

A basket strainer shall be provided on the suction side of the recirculation pump. A basket strainer will not be required on pumps connected to vacuum filters where the filter elements are not removed for cleaning.

Piping, including necessary valves conforming to Section 3125B.1, shall be provided for each filter vessel or element which requires periodic backwashing.

Valves shall not be located in any deck area surrounding a pool. Valves shall be installed on all recirculation, backwash- ing and drain system lines which require shutoff isolation, adjustment or control of the rate of flow. Each valve shall be installed in the equipment area and labeled as to its purpose.