Sounds like your first task is to map the standpipes, since they are buried in walls. (Unless accurate as-built drawings exist.) The easiest way we've found to do this is with an underground locator, with an induction signal. (Similar to a line locator the utilities use.) You can rent these at some rental supply places.) Once you confirm what connects to what, some exploratory holes will have to be made to verify pipe size. See Snake tech. by Ridgid tool co makes this a easier task, with less cleanup or repair to rated wall assemblies. Even so you're not going to know where every fitting is, so be generous in your calc's for Phantom fitting loss. Calc's are required because even the old requirement was 65Psi at the top, and current requirements are for 100Psi. If you static on the supply is only 60, it didn't meet code when it was installed if the building is newer than 1963. (I believe that was when the 65Psi was required in 14.) Sounds like calc's for Manual wet standpipe or fire pump for automatic.
Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Friday, April 03, 2009 4:40 PM To: [email protected] Subject: Standpipe dilemma I think I referenced this project in a previous post, but I have now got the whole place mapped out (I think) and need some input on solutions. The facility is a hospital. The interconnected buildings range from 1 to 6 stories on a side hill. On the south side, you enter at floor 1; the north side floor 3. Three separate lead-ins, two non-interconnected connections to the public supply. The building is only partially sprinklered. Static pressure is approximately 60 psi There are multiple standpipe/hose valve connections. Some, but not all, are fed from dedicated standpipe lines. Hose valves in cabinets in hallways. 6th Floor - no hose connections (mechanical and support areas only) 5th Floor - one 2-1/2" valve, one 1-1/2" valve 4th floor - three 2-1/2" valves, one 1-1/2" valve 3rd Floor - four 2-1/2" valves, one 1-1/2" valve 2nd Floor - four 2-1/2" valves, three 1-1/2" valves 1st Floor - five 2-1/2" valves, two 1-1/2" valves. Some 2-1/2" valves have 1-1/2" reducers, some do not. Most all riser piping is buried behind the walls and not in stairways. Not easily accessible for replacement One riser goes 5 floors, some go three, some valves a fed from horizontal mains on floors where the service enters. They are being required by the State to test the standpipes. My task is to figure out the standpipe criteria and design a system so that the criteria can be met. Any thoughts on what the design criteria would be for this system? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ Sprinklerforum mailing list http://lists.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 http://lists.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)
