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Is it permissible to have a Multi-Stage Single-Outlet fire Pump according to NFPA 20?

We have designed the sprinkler system for a warehouse with 1400 GPM at 123 psi water demand. So due to High fire pump capacity, (Regarding NFPA) Is it permissible to have a variable speed drive for the fire pump? Because if only a limited number of sprinklers are activated, the large pump will...

Thank you! I quite agree with that. The water supply (tank and fire pump set) should be such that to supply sprinkler and standpipe water demand at the required pressure and also fire flow at residual 20 psi pressure. Is there any difference between the outside hose definition and the hydrants...

Thank you! But I think paragraph 18.3.1 of NFPA 1 (2018) expands this subject because we don't have any municipal water supply system and we use a pre-filled water tank, So I think we can consider NFPA 1 method for Pump and tank sizing. as a result, it meets the NFPA 13 requirement also ( I...

Hi, I think two methods are mentioned in NFPA codes to determine fire pump capacity and ground-level water tank volume in an industrial site with some sprinklered and unsprinklered buildings and some hydrants in the yard. the first method is based on chapter 18 NFPA 1, "Minimum Required Fire...

Thank you for your replies. I have some uncertainties about sprinkler system consideration for high roof piled grain warehouses. 1- Since the combustible contents of the warehouse are not integrated solid substances (particulate solid) and possible fire is a surface fire, So I think spraying...

Hi I didn't find any regulation about automatic fire protection system design for unpackaged bulk storage such as piled grain warehouse. Is it effective to install sprinkler system for such these warehouses? Is there any criteria for such system design (like NFPA 13)?

yes, I mean asme b31.1. & also cold water run in the pipe. thank you.

Does it comply with ASME B36.1 to weld a 2.5" pipe to a 6" main pipe through making hole on the main pipe and welding the other pipe in the T form? both pipes are seamless sch 40 and water pressure is 100 psi.

are water mist extinguisher & pulverized water fire extinguisher both same thing?

Is it any requirement that compel to place the gaseous fire suppression cylinders outside of the enclosure (where shouldbe suppressed)?

In accordance to chapter 7 Of NFPA 14,the pressure limitations for class II standpipe (1 1/2 in. outlet) are between 4.5~6.9 bar and fire pump sizing shall be done to achieve minimum residual pressure on the most remote standpipe. The minimum residual pressure for class I system is 6.9 bar also...

Is That permissible To consider a flexible joint at fire pump's suction and discharge flanges in order to isolation of vibrations? such as rubber joints that placed for water booster pumps.

Hi Is That permissible in nfpa 20, to have a pressure tank in addition to pressure maintenance (Jockey) Pump for compensating system leakages ?