Pressure Ratings 1

[sharique]

Which NFPA Standards guides for Pressure Rating of piping components viz. OS&Y Valves, Strainers, NRV, Piping.
- For a Fire Pump Station, Fire Pumps selected is of 1000 GPM at 12 Bar pressure to achieve 6-7 bar pressure at the remotest hydrant.
- Can anybody tells me if I can use 175 psi Valves & piping components. Will 125 lb std. flange bolt hole drilling per ASME/ANSI B16.1 ok with the system.

 

[stookeyfpe]

Your required to use fittings listed for a design pressure of 175 PSIG. NFPA 20 (fire pumps), NFPA 13 (sprinkler systems) and NFPA 24 (underground fire protection water mains) all require that the fittings be listed for fire protection service and that they have a minimum pressure rating of 175 PSIG.

If you exceed the 175 PSIG pressure rating for sprinkler systems you are required to install a pressure reducing valve.

I don't have ASME B16.1. For flanges designed to B16.5 they work at pressures up to 285 PSIG at 68F.

 

[TravisMack]

Stookeyfpe:

You also have the option to use high pressure fittings and hp sprinklers when pressure exceeds 175 psi. I believe you simply have to use fittings / devices that are compatible with the water supply. You are limited to a max of 350 psi in standpipe systems.

 

[stookeyfpe]

Travis:

You are correct. I forgot about that little provision in NFPA 13.

Thanks for making the answer more accurate.