Type III — Low-PressureCâu 183 / 240
Before opening a low-pressure chiller to replace a failed tube bundle, the technician must:
a.Pressurize the shell to 20 psig
b.Add nitrogen and leave the refrigerant in place
c.Recover the charge to 25 mm Hg absolute
d.Vent the charge slowly to the roof
Giải thích
The refrigerant must be recovered to 25 mm Hg absolute before the machine is opened for major service such as a tube-bundle replacement. Venting is illegal, and pressurizing above 10 psig risks the rupture disk. Only after proper recovery may the low-pressure shell be opened.
Trích dẫn luật: 40 CFR §82.156Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- The rupture disk on a low-pressure appliance should be:
- A device that automatically maintains the correct refrigerant level between the condenser and evaporator of a low-pressure chiller is the:
- HCFC-123 requires good ventilation during service primarily because it:
- R-1233zd is increasingly used in modern low-pressure chillers because it:
- Which statement about pressurizing a low-pressure appliance for leak detection is correct?
- A recovery cylinder used for a large low-pressure chiller should be:
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