(1) Protection against thermal expansion shall be required when a check valve is required by Article 7.6.1.10., a backflow preventer is required by Article 7.6.2.2., or a pressure reducing valve is required by Article 7.6.3.3.
(1) A check valve shall be installed at the building end of the water service pipe where the pipe is made of plastic that is suitable for cold water use only.
(1) Every potable water system that supplies a fixture or tank that is not subject to pressures above atmospheric shall be protected against back-siphonage by a backflow preventer. (2) Where a potable water supply is connected to a boiler, tank, cooling jacket, lawn sprinkler system or other device where a non-potable fluid may be under pressure that is above atmospheric or the water outlet may be submerged in the non-potable fluid, the water supply shall be protected against backflow by a backflow preventer. (3) Where a hose bibb is installed outside a building, inside a garage, or where there is an identifiable risk of contamination, the potable water system shall be protected against backflow by a backflow preventer.
(1) Where the static pressure at any fixture may exceed 550 kPa, a pressure reducing valve conforming to Article 7.2.10.12. shall be installed to limit the maximum static pressure at the fixture to 550 kPa.