Cliff- It's my understanding that the suction PSI for the pump vendor is not the same as the static pressure. It's the pressure when the pump is running and water is flowing so there is no cavitation etc. Normally it's not a big deal if we design the system because the software I use will tell me what the pressure is. Since we didn't do the original system I'm not totally sure how to attack it. I've googled and read until my head was ready to explode, I just figured some of the old school guys may have a "rule of thumb" approach.
Brian Harris, CET BVS Systems Inc. bvssytemsinc.com -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of cliff--- via Sprinklerforum Sent: Thursday, August 06, 2020 12:29 PM To: [email protected] Cc: [email protected] Subject: RE: Pump Suction Pressure (NPSH) Brian, I may be looking at this too 'simply', but wouldn't your suction pressure be the static pressure at the flow test location plus or minus any pressure gain or loss for any difference between the elevation of the flow test and the fire pump suction? Cliff Whitfield, SET President Fire Design, Inc. 600 W. Bypass Hwy. 19E Suite 202 Burnsville, NC 28714 Ph: 828-284-4772 -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Brian Harris via Sprinklerforum Sent: Thursday, August 6, 2020 11:24 AM To: [email protected] Cc: Brian Harris <[email protected]> Subject: Pump Suction Pressure (NPSH) We're replacing a pump in an existing system and the pump vendor wants to know the pump suction pressure. Since we didn't do the original system and I know nothing about it what is a practical way of determining the pump suction to tell the vendor? Brian Harris, CET BVS Systems Inc. Design Manager bvssystemsinc.com<http://bvssystemsinc.com/> Phone: 704.896.9989 Fax: 704.896.1935 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
