Plumber Red Seal · Question
When sizing a main water service pipe for a building, which of the following factors should be the primary consideration?
The primary factor for sizing a main water service pipe is the total fixture unit count, as this value directly correlates to the maximum probable demand for wa
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Question: When sizing a main water service pipe for a building, which of the following factors should be the primary consideration?
Answer options:
- The number of occupants in the building.
- The total developed length of the longest run.
- The minimum required velocity to prevent sediment accumulation. ✅ The total fixture unit count for the building.
Correct answer: The total fixture unit count for the building.
Explanation: The primary factor for sizing a main water service pipe is the total fixture unit count, as this value directly correlates to the maximum probable demand for water simultaneously from all plumbing fixtures within the building. Other factors like pipe length will influence pressure drop, but the total fixture units determine the necessary flow rate.
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