Maybe a graphic will help. Look at NFPA 13 (2013) Fig A.8.16.1.1. In particular, the "wet pipe and dry pipe system". The FDC connects to the header on the supply-side of the dry and wet system control valves. Now look at the "wet pipe system" - there is no control valve downstream of the FDC tie-in location. But you could add one there, since it's on the system riser, not on the FDC pipe. If you need to do maintenance on that system - close the added valve.
From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, February 06, 2017 3:27 PM To: [email protected] Subject: RE: (1) FDC or (2) I can't picture where your control valve is that you're proposing but unless something has changed in NFPA 13, there are no control or isolation valves allowed on an FDC line. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] <mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Ed Kramer Sent: Monday, February 06, 2017 4:04 PM To: [email protected] <mailto:[email protected]> Subject: RE: (1) FDC or (2) [EXTERNAL] On a single-system wet system riser, there typically is no control valve downstream of the FDC tie-in location. By adding a control valve downstream of the FDC tie-in location, system A can be shut down for repair/maintenance by closing system A control valve. FDC remains fully functional for system B. Similar in function to an underground supply/header with multiple systems. Now if either of the FDC pipes that connect the single FDC to the 2 system risers gets damaged, all bets are off. From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] <mailto:[email protected]> Sent: Monday, February 06, 2017 2:02 PM To: [email protected] <mailto:[email protected]> Subject: RE: (1) FDC or (2) How would you shut down potential supply flow from the common FDC to the out of service system riser? Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] <mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Ed Kramer Sent: Monday, February 06, 2017 2:34 PM To: [email protected] <mailto:[email protected]> Subject: RE: (1) FDC or (2) [EXTERNAL] Brian, If FDC supply pipe were run from a single FDC to both system risers, and connected to the system risers between the BFP (or other supply check valve) and a system control valve, either of the systems could be shut down for maintenance/repair without impairing the FDC for the in-service system. Each system riser would need its own FDC check valve. Doing this might require more bulk pipe and a couple more control valves. Ed Kramer Bamford Fire From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brian Harris Sent: Monday, February 06, 2017 9:31 AM To: [email protected] <mailto:[email protected]> Subject: (1) FDC or (2) I'm working on a storage building that because of the way the building was built each "side" has its own Riser with its own FDC connection (picture a big horseshoe shape). The architect has requested that a single FDC be located on the corner of one of the building sides. Is it feasible to do this and tie the systems together via the FDC pipe or does each Riser still require its own FDC connection? Brian Harris, CET BVS Systems Inc. Design Manager bvssystemsinc.com <http://bvssystemsinc.com/> Phone: 704.896.9989 Fax: 704.896.1935
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