A a fire pump motor should be in accordance with nfpa 20 9 5 1 1 which states that it must comply with nema design b standards and be listed for fire pump service.
Fire pump motor sizing.
Steam turbines are also an option but are fairly uncommon.
Calculating fire pump pressure requirements depending on the size and layout of your building your fire pump needs to maintain a specific amount of pressure measured in gallons per minute gpm.
When designing or installing electrical power supplies for fire pumps and their accessories you must apply special rules as listed in nfpa 70 the national electrical code nec and the standard for centrifugal fire pumps cfp nfpa 20.
The most common choices for fire pump drivers are electric motors and diesel engines.
The last job parameter you need in order to size the fire pump is the required flow for the systems the pump will be serving sprinklers standpipes or other.
20hp 20kva used when running.
Standards for sizing and selection of fire pumps are governed by nfpa 20.
If a transformer supplies an electric fire pump motor size it at least 125 of the sum of the fire pump and pressure maintenance pump s motor loads and 100 of the ampere rating of the fire pump s accessory equipment 695 5 a.
Designing electrical systems for fire pumps since fire pumps are considered life safety equipment they must be reliable.
In any case the demand of the system will dictate the pressure and flow required.
When motor is operating after start requirement will be 1kva for 1hp i e.
For standpipe systems this flow is related to the type and size of the structure the pump is protecting.
Electric motors requiring high horsepower are commonly run on 460 volt or higher three phase power.
In order to determine the sizing of motors and engines for aurora fire pumps we refer to the guidelines put forth by the u l as well as in factory mutual s approval standard for split case fire pumps and finally the nfpa 20 2013 4 7 6.
Using gensize first size the generator with the starting.
For 480v 100hp correct conductor size is 2 0 references.
Pump sizing does the hydraulic calculation for a centrifugal pump and estimates differential head hydraulic power motor power npsh available.
Amps available on a generator per phase kva x 1 39.
B fire pump applications are discussed in article 695 of nfpa 70.
To get conductor size.
Size the generator to run between 60 80 full load rating of generator.
Selection of the fire pump depends on the building infrastructure and available space.
Selecting a f ire p ump.
