We've done this where there is a need for redundant pumps. Let's assume you need a 3000 gpm pump. A second 3000 gpm pump is quite expensive. The contractors had us set it up as (2) 1500 gpm pumps for a 3000 gpm total capacity. Then, you need a redundant pump in case one is down, so then you just have a 1500 gpm backup in case one goes down. AutoSprink was able to calculate that.
We have also done some jobs with demands in the 10,000+ gpm range. You need parallel pumps to make that work. AutoSprink could calculate that without issue. You just have to draw it up properly. Travis Mack, CFPS, CWBSP, RME-G, COC, SET Engineering Manager MFP Design 3356 E Vallejo Ct Gilbert, AZ 85298 480-505-9271 ext. 700 C: 480-272-2471 [email protected]<mailto:[email protected]> www.mfpdesign.com<http://www.mfpdesign.com> Send large files to us via: https://www.hightail.com/u/MFPDesign<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.hightail.com%2Fu%2FMFPDesign&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=eGdMZGu2wXhUupGwgGTrqF3b54OP5%2BAZvlHhABSexWY%3D&reserved=0> From: Sprinklerforum <[email protected]> On Behalf Of Prahl, Craig/GVL via Sprinklerforum Sent: Monday, June 21, 2021 7:50 AM To: [email protected] Cc: Prahl, Craig/GVL <[email protected]>; Matt Grise <[email protected]> Subject: RE: Calculating Parallel fire pumps What's the logic? Who knows. I know how this should be done and this isn't going to accomplish anything except just to complicate the design. The issue is, one building we have exceeds the 150% out of a single pump so with what they want to use, one pump won't make it unless we actually select it properly. I'm still trying to work through this mess and see if we cannot persuade them to not follow this concept. No, the "expert" is not a pump vendor, just a desk jockey with a self-proclaimed brilliant idea. Craig Prahl | Jacobs | Group Lead/SME - Fire Protection | [email protected]<mailto:[email protected]> | www.jacobs.com<http://www.jacobs.com> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: email or MS TEAMS -----Original Message----- From: Sprinklerforum <[email protected]<mailto:[email protected]>> On Behalf Of Matt Grise via Sprinklerforum Sent: Monday, June 21, 2021 10:44 AM To: [email protected]<mailto:[email protected]> Cc: Matt Grise <[email protected]<mailto:[email protected]>> Subject: [EXTERNAL] RE: Calculating Parallel fire pumps What is the goal of having 2 pumps? If you want full redundancy, could you just calculate the system one pump at a time? It seems like having them both running would be a better-case scenario that would result in added safety. Are they trying to get by with 2 smaller pumps? I think AutoSprink might be able to do it. You would want to confirm with AutoSprink (MEP CAD), but I am pretty sure that we have calculated multiple source systems with it before. I don't suppose your quantum expert is also a pump vendor? Matt -----Original Message----- From: Sprinklerforum <[email protected]<mailto:[email protected]>> On Behalf Of Prahl, Craig/GVL via Sprinklerforum Sent: Monday, June 21, 2021 9:37 AM To: [email protected]<mailto:[email protected]> Cc: Prahl, Craig/GVL <[email protected]<mailto:[email protected]>> Subject: Calculating Parallel fire pumps We have a project in one of the Arab states. We are following a little bit of the UFC and some of the local codes. The owner wants two pumps selected at 50% of the required capacity instead of one pump as we would normally provide. His thought is that pump 1 comes on and runs at 50% of it's rating and then pump two comes on and runs at 50% to meet the total system demand. Yeah, I know, don't laugh. And we've tried to talk them out of this arrangement since it will not work as they expect but someone who is thinks they are an expert in Quantum Inter-Planetary Fire Protection Hydro-Physics thinks this is a great idea. We use HASS for hydraulic calcs and it does not have the ability calculate using two pumps in parallel. Can AutoSprink or Hydracad calculate this kind of pump arrangement? Craig Prahl | Jacobs | Group Lead/SME - Fire Protection | [email protected]<mailto:[email protected]> | http://www.jacobs.com<http://www.jacobs.com> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: email or MS TEAMS ________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. 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