Type III — Low-Pressure第 183 / 240 题
Before opening a low-pressure chiller to replace a failed tube bundle, the technician must:
a.Vent the charge slowly to the roof
b.Pressurize the shell to 20 psig
c.Recover the charge to 25 mm Hg absolute
d.Add nitrogen and leave the refrigerant in place
解析
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.
法律依据: 40 CFR §82.156免费刷完整 240 道题库 — 无需注册。
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