Chapter 7 Water Supply

Dr. Hunter's method utilizes water supply fixture units (WSFUs), fixture flow demand charts, and friction loss/flow rate charts to determine pipe sizes.

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Standard pressure due to the weight of air at sea level is 0 psia (0 kPa).

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In the 2015 IPC pipe size / pressure range tables, 5% of the total developed length is added to the total length to account for friction loss in a building water supply system.

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Velocity in a water supply system is affected by the demand at the point of use, the capacity of the supply system, and pressure.

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Hunter's Curve can be used to estimate the number of fixture units for a single room.

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A pipe segment is the length of piping from one branch fitting to the next branch fitting or the fixture branch serving a fixture or appliance outlet.

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The minimum pressure fluctuation may be obtained by taking a pressure reading using a gauge that will register the minimum pressure as measured over a 24-hour period, or it may be obtained from the water purveyor.

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The demand line is the water supply pipe that connects a fixture to a branch water supply pipe or to the main water supply pipe.

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Velocities in a water supply system shall not exceed 10 ft/s (3 m/s), except as otherwise approved by the authority having jurisdiction (AHJ).

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The 2015 UPC method for sizing a building water supply system allows for precise friction loss and flow rate calculations that will benefit large installations.

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