Air compressor system.

A compressor used to supply breathing air to a diver must have— (a) A volume tank that is— (1) Built and stamped in accordance with section VIII, division 1 of the ASME Code with— (i) A check valve on the inlet side; (ii) A pressure gage; (iii) A relief valve; and (iv) A drain valve; and (2) Tested after every repair, modification, or alteration to the pressure boundaries as required by § 197.462; (b) Intakes that are located away from areas containing exhaust fumes of internal combustion engines or other hazardous contaminants; (c) An efficient filtration system; and (d) Slow-opening shut-off valves when the maximum allowable working pressure of the system exceeds 500 psig.