Selecting the fire pump 2

[eki1969]

I have designed a fire hydrant system which has water/Foam monitors, spray nozzles, foam chambers and hydrants for a fuel storage tank facility. I came up with a pressure of 9 bars and a flow of 7000 lpm. Please help me properly size the fire pump. The pump shall be a diesel driven centrifugal. Thanks eki19606

 

[eduvillela]

first thing to do is to determine the specific speed, so you can select the best pump to your application.
Here you can find how to calculate that:

http://www.engineeringtoolbox.com/specific-speed-pump-fan-d_637.html

 

[Artisi]

Contact a fire pump supplier with your request. Does the pump have to comply with any particular fire pump code?

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[eki1969]

Artisi, thanks very much. Well one of the parameter or code of NPFA, if I am on the right track, in fire pump selection is the pump should produce 65% of that pressure which would than be 65% x 9 = 5.85 bar and 150% of the flow which then would be 150% x 7000 = 10500 lpm. Am I going on the right track or? Any suggestion from anyone?

 

[Artisi]

if you have to comply with NPFA, you will need to open discussions with a firepump supplier / manufacturer who can supply NFPA approved fire pumps. As for applying the NFPA code, there are many steps and loops to jump thru' to meet compliance and if you are asking these basic questions I would suggest you engage a specialist in NFPA systems as peoples lives depend on a properly operating system. And further, if the system has to conform with NPFA normally stipulated by the insurance underwriters there are no short-cut in correct selection and installation.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[bimr]

As Artisi is posting, the fire pump is part of a system. Review the attached document that outlines some of the system requirements.