We had 2 of these a the City Center project, one each for the 8" high pressure and 10" low pressure loops around the site.
>From what I remember, on the discharge side of the pump just after the tee creating the loop (within the central plant - heated space), we installed 2 check valves and two outlets (circulating pump in & out). Even with this arangement, created and approved by the PE consultants and approved by the AHJ, we still had to add insulation around the pipe at varing thicknesses in different areas. There was an entire report on heat loss/gain for each area that the pipe passed through, projected air current speeds, how many feet of pipe had to be within heated spaces, GPM circulation requirements, and even how many feet of pipe could be exposed to a non-circulating condition (feeds for standpipes into stairwells, bulk mains to upper levels) that we had to comply with. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Damien Shannon Sent: Wednesday, April 06, 2011 5:40 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)
