Plumber Red Seal · Question
In the context of a DWV system, what defines the 'hydraulic load' of a fixture?
The hydraulic load is a measure of the probable discharge into the drainage system by various plumbing fixtures. The NPC assigns 'fixture units' (F.U.) to each
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Question: In the context of a DWV system, what defines the 'hydraulic load' of a fixture?
Answer options:
- The water pressure required for the fixture to operate
- The total volume of the fixture in litres ✅ The rate of discharge from the fixture expressed in fixture units
- The diameter of the fixture's drain outlet
Correct answer: The rate of discharge from the fixture expressed in fixture units
Explanation: The hydraulic load is a measure of the probable discharge into the drainage system by various plumbing fixtures. The NPC assigns 'fixture units' (F.U.) to each type of fixture to simplify the calculation for sizing drainage and venting pipes.
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