Fire Water Systems design
Fire Water Systems design
(OP)
hi guys
i am working on a fire water system and i found a few guidelines on NFPA20. What is the maximum pressure that the fire water header can be designed at?
i am working on a fire water system and i found a few guidelines on NFPA20. What is the maximum pressure that the fire water header can be designed at?





RE: Fire Water Systems design
If you try protecting your chicken farm, 1000 kPa(g) will do. If you try protecting the Burj Khalifa in Dubai, you have to pump water in top of the skyscraper, so you will get 1000 kPa(g) in top. That is, 1000 + 8300 = 9300 kPa(g). Hey, that's the minimum pressure, not the maximum. The maximum for Burj should be 9300 + 10% margin, that is 10,230 kPa(g). For your application, use the above principle.
Cheers,
gr2vessels
RE: Fire Water Systems design
RE: Fire Water Systems design
How high must it spray ?
RE: Fire Water Systems design
RE: Fire Water Systems design
Fire fighting and fire flow testing can involve some very high flow velocities, as well as opening and closing valves and hydrants in quite pressure-packed (so-to-speak!) emergency/rear-ends-and-elbows circumstances, along with concomitant shocks to all components of the systems exposed due to water hammer etc.
Some pipe materials, joints and manufacturers have demonstrated very high FM ratings of products, e.g. for some ductile iron pipe manufacturers and joints that rate up to twice that minimum, i.e. 350 psi or more, whereas some plastic pipes e.g. might rate far lower. [I think I may have seen a lower minimum rating than 175 psi now allowed by FM for some plastics, but am not really sure why.]
RE: Fire Water Systems design