An industrial facility requires a new potable water supply line that will deliver a peak instantaneous demand of 6.0 L/s. Using a maximum allowable friction loss of 2.0 kPa per metre, what nominal pipe size (NPS) of Type L copper tubing would be appropriate according to typical plumbing sizing charts?

Question: An industrial facility requires a new potable water supply line that will deliver a peak instantaneous demand of 6.0 L/s. Using a maximum allowable friction loss of 2.0 kPa per metre, what nominal pipe size (NPS) of Type L copper tubing would be appropriate according to typical plumbing sizing charts?

Answer options:

• NPS 50 (DN 50) ✅ NPS 65 (DN 65)
• NPS 80 (DN 80)
• NPS 100 (DN 100)

Correct answer: NPS 65 (DN 65)

Explanation: To determine the appropriate pipe size, a pipe sizing chart or calculator is needed, considering flow rate and friction loss. For 6.0 L/s and 2.0 kPa/m friction loss, an NPS 65 (DN 65) pipe is typically the smallest size that would meet friction loss requirements for Type L copper. NPS 50 would result in excessive friction loss, while NPS 80 and NPS 100 would be oversized.