Plumber Red Seal · Question
What phenomenon occurs in a drainage system when negative pressure (below atmospheric) develops, potentially siphoning the water from a fixture's P-trap?
Siphonage is the loss of a trap seal caused by negative pressure in the drainage system. Proper venting is required to introduce air into the system to break th
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Question: What phenomenon occurs in a drainage system when negative pressure (below atmospheric) develops, potentially siphoning the water from a fixture's P-trap?
Answer options:
- Back pressure ✅ Siphonage
- Evaporation
- Hydraulic Jump
Correct answer: Siphonage
Explanation: Siphonage is the loss of a trap seal caused by negative pressure in the drainage system. Proper venting is required to introduce air into the system to break this vacuum and protect the trap seals from being pulled out.
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