WAC 296-56-60241. Air receivers

(1) This section applies to compressed air receivers and equipment used for operations such as cleaning, drilling, hoisting and chipping. It does not apply to equipment used to convey materials or in transportation applications such as railways, vehicles or cranes. (2) Employers must meet the following requirements for gauges and valves: (a) Air receivers must be equipped with indicating pressure gauges and spring-loaded safety valves. Safety valves must prevent receiver pressure from exceeding 110 percent of the maximum allowable working pressure. (b) No other valves must be placed between air receivers and their safety valves.