Administration第 78 / 110 题
A DWV rough-in is water tested. The test fills the system with water to create a 10 ft head at the lowest point. Using 0.433 psi per foot, what pressure does a 10 ft water column exert at the base, and what does the test prove?
a.2.3 psi, that vents are clear
b.4.33 psi, that joints hold under head with no leaks
c.10 psi, that slope is correct
d.0.43 psi, that traps are set
解析
A 10 ft column exerts 10 x 0.433 = 4.33 psi at the base, and holding that head for the required time proves every joint below the fill line is watertight. The water (or an equivalent air) test is applied before the piping is concealed. A dropping level indicates a leak to be located and repaired.
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