The only recirc I've ever heard of had to do with recirculating water at the fire water storage tank as a means to prevent freezing of water within the tank. (Ref. NFPA 22)
I've had this proposed by an owner who wanted to do some unorthodox and questionable things but we turned it down as there was no reference to the process in any Standard. Obviously if they've had freeze-ups the method is unsatisfactory in providing protection of the pipe against freezing. The only way any recirc can work is for the system to be looped so if for no other reason, the presence of dead- end legs should have taken this option off the table. There is no mention of the practice in the NFPA Handbook nor NFPA 24. That being the case how would an AHJ accept this as a proven method to protect the system against freezing? Craig L. Prahl, CET Fire Protection CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Damien Shannon Sent: Wednesday, April 06, 2011 8:40 AM To: [email protected] Subject: Firewater Circulation Pump Dear Forum, Wondering if anyone can share knowledge/experience in regards to 'Firewater Circulation Pump' arrangements as a solution to freeze protection. Personally never heard of them before today but we have an enquiry in from a facility that has one that is in place several years. 10" externally looped main aboveground around a facility (approx 1500' worth). However it is not performing as it was intended as he has had freeze ups. There are some dead-end pipes feeding FHVs off this loop which I can't even see as being feasible with the concept. Below is a link that discusses the topic (page 60), though it doesn't have arrangement details/schematic or such. Can anyone provide info or refer a source that would provide details for the valving/arrangement. Any insight would be appreciated. Damien Shannon Provincial Sprinkler Company Ltd. Unit 4, Cork Airport Industrial Estate Kinsale Road, Cork, Ireland. Tel: (021) 4965058 Fax: (021) 4317425 http://books.google.ie/books?id=1o6-H-ajj5oC&pg=PA60&dq=fire+water+recircula tion+pumps&hl=en&ei=kc1sTfHELJSChQeQ2IWPDA&sa=X&oi=book_result&ct=result&res num=1&ved=0CD4Q6AEwAA#v=onepage&q&f=false _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
