Codes & Safety第 107 / 120 题
A high-rise DWV system is water tested in sections. The highest joint in the section currently under test is 28 ft above the building drain, and three more floors of piping continue above that section. To what height above the building drain must the test standpipe extend?
a.28 ft, which is the height of the highest joint in the section under test
b.30 ft
c.33 ft
d.38 ft
解析
The test requires at least a 10 ft head of water on the highest point of the section being tested, so the standpipe must rise 10 ft above that point: 28 ft + 10 ft = 38 ft above the building drain. Stopping at 28 ft puts zero head on the top joint of the section, and 30 ft and 33 ft leave only 2 ft and 5 ft of head. The 10 ft exception for the uppermost portion of the system does not apply here because more piping continues above this section.
法律依据: IPC §312.2免费刷完整 120 道题库 — 无需注册。
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