Drainage, Waste & Vent第 13 / 120 题
Which fitting is required to change direction from horizontal to horizontal in a drainage line?
a.A short sweep quarter bend
b.A sanitary tee
c.A combination wye and 1/8 bend
d.A vent tee
解析
A horizontal-to-horizontal change of direction must use a long sweep pattern such as a combination wye and 1/8 bend, which keeps the flow moving without a sharp shoulder where solids collect. A short sweep quarter bend turns too abruptly for horizontal flow, a sanitary tee is only for horizontal-to-vertical, and a vent tee is a dry vent fitting not rated for drainage flow.
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