Minnesota Administrative Rules

4714.0608 WATER PRESSURE, PRESSURE REGULATORS, PRESSURE RELIEF VALVES, AND VACUUM RELIEF VALVES.

UPC section 608.5 is amended to read as follows:

608.5 Discharge Piping. The discharge piping serving a temperature relief valve, pressure relief valve, or combination of both shall have no valves, obstructions, or means of isolation and shall:

(1) be equal to the size of the valve outlet and shall discharge full size to the flood level of the area receiving the discharge and pointing down;

(2) consist of materials rated at not less than the operating temperature of the system and shall be approved for such use or comply with ASME A112.4.1;

(3) discharge independently by gravity through an air gap to a safe place of disposal or within 18 inches of the floor. Relief valve drains shall not terminate in a building's crawl space;

(4) discharge in such a manner that does not cause personal injury or structural damage;

(5) not consist of any part that may be trapped or subject to freezing;

(6) not consist of a threaded terminal end of the pipe; and

(7) not discharge from a relief valve into a water heater pan.

Statutory Authority:

MS s 326B.43; 326B.435

History:

40 SR 71; 45 SR 1007

Published Electronically:

September 27, 2021