A&P Power Plant Reciprocating Engines Practice Test

In a drainage system, what condition is a properly installed vent primarily intended to prevent?

Mineral scale in hot water piping Loss of trap seal from siphonage or backpressure Excessive gas pressure at an appliance regulator Corrosion of steel sprinkler hangers

Correct Answer:

Loss of trap seal from siphonage or backpressure

Explanation:

Vent piping protects traps by admitting air and relieving pressure so trap seals are not pulled or forced out.

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