Tanks are covered in NFPA 22. Running any supply to the tank underground creates a floor penetration which can become a hidden leak point in the future. If you get a leak in the tank floor, you've got an uncontrolled disaster. You'll also have to deal with cross-contamination control unless you rise up inside the tank above the upper fill level but since you'd have piping within the water volume, the AHJ may still require a backflow device on the system. Don't forget you'll have some type of automatic fill valve that will need a home somewhere as well.
Typically the fill connection is above the upper fill level either in the roof or high on the side. This creates an air gap for cross contamination control. If it can freeze, they are typically insulated and possibly heat traced with a supervised HT system. Coming in the bottom is just not a good idea for many reasons. Craig Prahl | Jacobs | Fire Protection SME - Special Hazards | [email protected]<mailto:[email protected]> | www.jacobs.com<https://urldefense.com/v3/__http:/www.jacobs.com/__;!!KZTdOCjhgt4hgw!-_khxU8gU0_6jc895I7kRbnU8JghRDsWgqOblZ4jr7Qp2IVbR30VYw_hWvNFtphnl0uWpB9KIvbYi1pvZz4$> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS From: Brian Harris <[email protected]<mailto:[email protected]>> Sent: Tuesday, July 11, 2023 3:43 PM To: [email protected]<mailto:[email protected]> Subject: [EXTERNAL] [Sprinklerforum] Storage Tank Might be a silly question but when using a storage tank for a pump where is the tank fill located? Top, Bottom, Side, etc. This is in an area where it does get cold enough to freeze so I'm wondering if it can be filled from under the tank. The city supply psi will overcome the head pressure in the tank so technically it would work. Brian Harris, CET BVS Systems Inc. bvssystemsinc.com<https://urldefense.com/v3/__http:/bvssystemsinc.com/__;!!B5cixuoO7ltTeg!BdaaN29Xkegb0ENUkOou55KvOueHmZ-8p7VaXUP8gE1rLMRLqoBntB_EekXTch7SServMS_G4v0kQzKP1CxRQygL$> Phone: 704.896.9989 Fax: 704.896.1935 ________________________________ 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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