So, I assume these tanks are at an elevation above the fire pump so you have gravity flow to the pump?
NFPA 20 provides guidance on the size of the suction line, size the lines between the tanks in the same manner. Craig Prahl | Jacobs | Fire Protection SME – EV, AM, DC, Special Hazards [email protected]<mailto:[email protected]> | www.jacobs.com<https://urldefense.com/v3/__http:/www.jacobs.com/__;!!KZTdOCjhgt4hgw!-_khxU8gU0_6jc895I7kRbnU8JghRDsWgqOblZ4jr7Qp2IVbR30VYw_hWvNFtphnl0uWpB9KIvbYi1pvZz4$> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS From: Fpdcdesign <[email protected]> Sent: Tuesday, September 23, 2025 10:25 AM To: Prahl, Craig <[email protected]> Cc: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: Re: [EXTERNAL] [Sprinklerforum] Multiple tank pump suction Craig, The FD will need to truck in water for hose, plus there is a nearby river they can draft from. This is a very difficult site as there is a lot of ledge and they want the tanks underground. They are trying to avoid having to blast. There Craig, The FD will need to truck in water for hose, plus there is a nearby river they can draft from. This is a very difficult site as there is a lot of ledge and they want the tanks underground. They are trying to avoid having to blast. There area other issues, but would take too long to describe. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell) On Sep 23, 2025 at 10:18 AM, <Craig Prahl<mailto:[email protected]>> wrote: One question, if there is no public water supply, what will the fire department use for firefighting? Will they truck it in? Are these concrete tanks above ground? What is the reason for this arrangement in lieu of one single tank? Craig Prahl | Jacobs | Fire Protection SME – EV, AM, DC, Special Hazards [email protected]<mailto:[email protected]> | www.jacobs.com<https://urldefense.com/v3/__http:/www.jacobs.com/__;!!KZTdOCjhgt4hgw!-_khxU8gU0_6jc895I7kRbnU8JghRDsWgqOblZ4jr7Qp2IVbR30VYw_hWvNFtphnl0uWpB9KIvbYi1pvZz4$> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS From: Fpdcdesign <[email protected]<mailto:[email protected]>> Sent: Tuesday, September 23, 2025 7:45 AM To: Sprinklerforum <[email protected]<mailto:[email protected]>> Subject: [EXTERNAL] [Sprinklerforum] Multiple tank pump suction I have a client that is building a retail store in an area with no public water supply. Sprinkler water will be supplied by pump and tank. My estimate is for 20000 gallons. The client want to use 4 - 5500 gallon concrete tanks connected in series. I have a client that is building a retail store in an area with no public water supply. Sprinkler water will be supplied by pump and tank. My estimate is for 20000 gallons. The client want to use 4 - 5500 gallon concrete tanks connected in series. My question is what size connections between the tanks will be required? NFPA 22 doesn’t address this (that I found). An old copy of the Hydraulic Institute Standards I have states that for piping to suction pits, keep the velocity below 2 ft/sec. Would this be a reasonable number? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell) ________________________________ 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. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. ________________________________ 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. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
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