DennisR4
Mechanical
- Nov 24, 2014
- 88
Ok, so I recently had an engineer and an uncertified sprinkler "designer" tell me that NFPA states when performing hydraulic calculations, you need to end up with a cushion of 7 psi below your water source? I have scoured my copy of NFPA 13, and I do not see where this is stated? I think they have the "minimum operating pressure" requirement confused with the safety cushion. Anyone have any ideas where I can find this requirement?
Before everyone puts me on blast, I usually shoot for 10 psi or 10%. This is not in regards to any calculations I performed.
Before everyone puts me on blast, I usually shoot for 10 psi or 10%. This is not in regards to any calculations I performed.