9/6/2023 0 Comments Psi meaning water![]() ![]() Add a new paragraph 2-1.1.1 to read as follows: I am not sure all states require a minimum 20 psi suction pressure with the pump operating at 150% but I do know all of them that I have been licensed in do.Īs an example the Georgia Fire Marshal at the top of page 27 of their rules and regulations http: //g/External resources/ Documents/ FireMarsha l%20-%20Ru les%20and% 20Regulati ons/120-3- 3%20State% 20Minimum% 20Fire%20S afety%20St andards%20 -%20effect ive%2002-0 1-2007.pdfġ. RE: Low Pressure at Pump Inlet SprinklerDesigner2 (Mechanical) 5 Aug 09 17:15 I'll look at it some more when I get done with an errand.Īny of you PE's out there see anything where I can be wrong? Ok, you got at least a tee, gate and two elbows plus fittings to the pump suction flange anything else (like a backflow preventor perhaps) on the suction side of the pump? This is a real big deal because remember, the 20 psi minimum requirement is anywhere in the pump suction like and that goes all the way to your pump suction flange. Using C-900 exactly what are you using? DR-14? DR-18? you'll probably have to go 12".Īny elevation difference between the pump suctin and tap or connection to city water main? Be careful, 10' over 1,400 feet doesn't look like much but it means a lot. I'll check if you want but off my head I don't think 10" will do it. Your suction supply must be large enough so suction pressure does not drop below 20 psi anywhere in the suction pipe with the pump opeating at 150% of capcity. If the system requires 1800 gpm the smallest pump you should be using is 1,500 gpm. I know from experience Ohio requires the same and if you dig I believe you will find every state requires a minimum of 20 psi suction pressure at 150% of pump rated capacity because federal clean water standards require it. H ttp://img3 4.imagesha ck.us/img3 4/1833/low suctionfir epumps.jpg I'm in Georgia and here is what the Georgia Environmental Protection Division says about fire pumps taking suction from city water supply. I'll go out on a big limb playing engineer when I am not one but for what it is worth. ![]()
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