Codes & SafetyCâu 109 / 120
A water distribution system that will operate at 45 psi working pressure is tested with water. The plumber pumps it to 48 psi, and after 15 minutes the gauge reads 46 psi. How should the result be reported?
a.Pass, because the test pressure of 48 psi exceeded the 45 psi working pressure of the system
b.Fail, because the test must be at the working pressure but not less than 50 psi and must hold for 15 minutes with no drop
c.Pass, because a 2 psi drop over 15 minutes is within the allowable tolerance for a supply test
d.Fail, because a water supply system may only be tested with compressed air at 100 psi
Giải thích
The supply test is run at the system's working pressure but never less than 50 psi, and it must hold for at least 15 minutes without a loss of pressure, so a 48 psi start that falls to 46 psi fails on both counts. Exceeding the working pressure alone is not enough when the code sets a 50 psi floor. There is no allowable pressure drop; any drop indicates a leak. Air may be permitted as an alternate test medium in some jurisdictions, but it is not the only method and 100 psi is not the required value.
Trích dẫn luật: IPC §312.5Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
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