Plumber Red Seal · Question
A plumber is inspecting a residential water service line to determine its capacity. The existing copper service line is 19 mm (3/4") nominal diameter and is 30 metres long. The municipal water main pressure is 450 kPa. Assuming an average friction loss of 15 kPa per 100 metres for this pipe size and flow rate, what is the approximate pressure available at the entrance to the house?
To calculate the pressure at the house, first determine the total pressure loss: (15 kPa / 100 m) * 30 m = 4.5 kPa. Then subtract this loss from the main pressu
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Question: A plumber is inspecting a residential water service line to determine its capacity. The existing copper service line is 19 mm (3/4") nominal diameter and is 30 metres long. The municipal water main pressure is 450 kPa. Assuming an average friction loss of 15 kPa per 100 metres for this pipe size and flow rate, what is the approximate pressure available at the entrance to the house?
Answer options:
- 420 kPa
- 435 kPa ✅ 445 kPa
- 465 kPa
Correct answer: 445 kPa
Explanation: To calculate the pressure at the house, first determine the total pressure loss: (15 kPa / 100 m) * 30 m = 4.5 kPa. Then subtract this loss from the main pressure: 450 kPa - 4.5 kPa = 445.5 kPa. Therefore, 445 kPa is the closest approximation.
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