Type III — Low-PressureQuestion 185 of 240
Which statement about pressurizing a low-pressure appliance for leak detection is correct?
a.The higher the pressure, the safer the test
b.Keep pressure at or below 10 psig at all times
c.Pressure up to the rupture-disk setting is fine
d.Use compressed air for convenience
Explanation
Leak-test pressure must stay at or below 10 psig to remain safely under the roughly 15 psig rupture disk. Approaching the disk setting or using compressed air is dangerous. Only dry nitrogen, sometimes with a trace of refrigerant, should be used.
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