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What is the range of the ideal residual pressure at the farthest consumer's tap in a properly designed water distribution system?
1. 0.021 to 0.025 N/mm2
2. 0.016 to 0.020 N/mm2
3. 0.031 to 0.035 N/mm2
4. 0.026 to 0.030 N/mm2

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Correct Answer - Option 3 : 0.031 to 0.035 N/mm2

Explanation:

  • Residual pressure is the pressure remaining in a water supply while water is flowing. Flow pressure is the forward velocity pressure at a discharge opening that is measured with a pitot tube.
  • 0.031 to 0.035 N/mm2 is the range of the ideal residual pressure at the farthest consumer's tap in a properly designed distribution system.
  • Provide a minimum of 40-psi (pound per square inch) pressure at the meter to each and every customer service using the pad elevation of the water tank, at half-full, serving the area as the starting hydraulic grade line. Fire hydrants are to have 20-psi minimum residual pressure at design capacities.

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