Fire water pump capacity calculation begins with fire zones determination. The whole pictures of fire water pump capacity calculation is expressed in figure below. Fire water pump capacity calculation. To determine fire water pump capacity, we can say we determine fire water demand. Maximum fire water demand is summation of fire water required for fixed system (water spray, foam, sprinkler) and fire water required for manual fire fighting equipment (fire hydrant, fire monitor, and hose reel).
• Horizontal elbows or tees upstream of a fire pump must be 10 pipe diameters from the suction flange on a split-case fire pump. • Pumps must maintain a positive suction pressure at the suction flange. • Electrical feeds to fire pump controllers must have a two-hour fire rating. • Fire pumps can’t be used as pressure-maintenance pumps.
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To size a fire pump, designers combine pump curves and water supply curves. Once engineers determine that a fire pump is needed, they have to pick one that’s the right size. The first consideration when sizing a fire pump is making sure that it’s big enough. In other words, a pump is only useful if it produces enough flow and pressure.
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How to determine fire water pump capacity?
To determine fire water pump capacity, we can say we determine fire water demand. Maximum fire water demand is summation of fire water required for fixed system (water spray, foam, sprinkler) and fire water required for manual fire fighting equipment (fire hydrant, fire monitor, and hose reel).
What are the requirements for a fire pump?
• Pumps must maintain a positive suction pressure at the suction flange. • Electrical feeds to fire pump controllers must have a two-hour fire rating. • Fire pumps can’t be used as pressure-maintenance pumps.
Can a fire pump be used as a pressure pump?
• Electrical feeds to fire pump controllers must have a two-hour fire rating. • Fire pumps can’t be used as pressure-maintenance pumps. • Variable-speed pumps are allowed by the code. • Fire pumps need to be installed in a 2-hour rated room.
Can I use a vertical turbine fire pump for water supply?
If you are using a private water supply, lake, or ground-level storage tank, you must remember that you are not permitted to use a suction lift with a fire pump. Thus, if the water supply is located below the suction inlet to the fire pump, you may have to utilize a vertical turbine fire pump in lieu of the other types of pumps available.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher