Type III — Low-PressureCâu 185 / 240
Which statement about pressurizing a low-pressure appliance for leak detection is correct?
a.Keep pressure at or below 10 psig at all times
b.Pressure up to the rupture-disk setting is fine
c.Use compressed air for convenience
d.The higher the pressure, the safer the test
Giải thích
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.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- HCFC-123 requires good ventilation during service primarily because it:
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- A recovery cylinder used for a large low-pressure chiller should be:
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