Tweco Single & Two Stage Regulators - Manual (Page 19)

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3.03 LEAK TESTING THE SYSTEM
Leak test the system before putting into operation.
1. Be sure that there is a valve in the downstream equipment to
turn off the gas flow.
2. With the cylinder valve open, adjust the regulator to deliver the
maximum required delivery pressure.
3. Close the cylinder valve.
4. Turn the adjusting screw/knob counterclockwise one turn.
a) If the high-pressure gauge reading drops, there is a leak
in the cylinder valve, inlet fitting, or high-pressure gauge.
b) If the low-pressure gauge drops, there is a leak in the
down stream equipment, hose, hose fitting, outlet fitting or
low-pressure gauge. Check for leaks using an approved
leak detector solution.
c) If the high-pressure gauge drops and the low-pressure
gauge increases at the same time, there is a leak in the
regulator seat.
d) If the regulator requires service or repair, take it to a
qualified repair technician.
5. Once leak testing has been performed and there are no leaks
in the system, slowly open the cylinder valve and proceed.
WARNING
If a leak has been detected anywhere in the system, dis-
continue use and have the system repaired. DO NOT use
leaking equipment. Do not attempt to repair a leaking
system while the system is under pressure.