And that system was based on installation inside a building where it was tied into a hydronic hvac system. So application to an underground fire main would be a stretch.
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 Thom Sent: Wednesday, April 06, 2011 12:23 PM To: [email protected] Subject: RE: Firewater Circulation Pump Two things to consider for any "Circulation system" to prevent freezing of water in areas where the temp. would normally freeze the water. Is all the water in motion? (your answer is NO. So at least parts of the system will most likely freeze anyway.) Is there any heat source to create input of sufficient BTU's to overcome any heat loss from exposure to the below freezing elements? (Doesn't state this in your post.) NFPA 13, 2010 3.4.2 "Circulating Closed Loop Sprinkler System" might provide some insight, but remember this was anticipated to be used with "Other building systems" and not for freeze protection. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Damien Shannon Sent: Wednesday, April 06, 2011 6:40 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) _______________________________________________ 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)
