Pump Pressure How Much Over 175 psi??
Pump Pressure How Much Over 175 psi??
(OP)
I seem to be seeing fire pumps test reports with churn pressures of 175 psi and greater the last few weeks. I know the max is 175 psi unless the sprinkler/standpipe components are rated higher. The question is how much higher will you go before you will not accept the system? My feeling is anything over 185 psi is a stopper for me on existing systems and 170-175 psi on any new jobs . What is your number???
Oh yea I get to pay for the water damage via a coverage known as sprinkler leakage when it goes bad!
Oh yea I get to pay for the water damage via a coverage known as sprinkler leakage when it goes bad!
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Fire Sprinklers Save Firefighters’ Lives Too
Not ALL Sprinkler Systems Are Created Equal! An Inadequate Sprinkler Design Is JUST As Bad As A Nonsprinklered Building!! When Occupancies Change So Should The Sprinkler System. See NFPA 25, 2002, Edition, Section 4.1.5, 4.1.6 & 4.1.6.1.





RE: Pump Pressure How Much Over 175 psi??
Travis Mack
MFP Design, LLC
RE: Pump Pressure How Much Over 175 psi??
I see OS& Y and butterfly valves stamped 175 psi on the discharge side of the pump, why is this not a concern?
****************************************
Fire Sprinklers Save Firefighters’ Lives Too
Not ALL Sprinkler Systems Are Created Equal! An Inadequate Sprinkler Design Is JUST As Bad As A Nonsprinklered Building!! When Occupancies Change So Should The Sprinkler System. See NFPA 25, 2002, Edition, Section 4.1.5, 4.1.6 & 4.1.6.1.
RE: Pump Pressure How Much Over 175 psi??
Travis Mack
MFP Design, LLC
RE: Pump Pressure How Much Over 175 psi??
If your valves have flanged fittings they should meet ASME B16.5. I seem to recall that a 150 pound flange is rated to 285 PSIG at 70F.
Is the data you want or am I getting less intelligent as I am getting older?
If you need yield data on pipe wall thickness based on fabrication I also have that data at atmospheric normal temperature and pressure.
RE: Pump Pressure How Much Over 175 psi??
It is very common for a significant portion of the components (sprinklers, valves, pressure switches, flow switches, pressure relief valves, etc.) to be rated at 175 psi OR have verbage which indicates the warranty is null and void if the component experiences pressures exceeding 175 psi.
I tell my customers the max system pressure should be 175 psi.......if your system demand requires a static pressure abive 175 psi, I suggest a thorough evaluation of the design, storage heights, k-factors, etc.
As a sprinkler contractor and FPE, I am also concerned about water damage if I do not properly advise my customers. However, giving the manufacturer an out clause by voiding the warranties of the system components is just as concerning.