Thanks Jim. The test assembly as mentioned does it come with the flow meter and pitot tube? Is there any web sites I can look at? Thanks for all the information.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jim Davidson Sent: Tuesday, March 22, 2011 9:56 AM To: [email protected] Subject: RE: PRV Testing We have worked with owners of high rise building equipped with PRV's to upsize the drain risers to 4 inch and equipped with a 2½ swivel male inlet with valve to allow flow testing of PRV in place. The contractor usually uses a 2 1/2" flow meter, that has been flow tested and flow verified with a pitot tube and gauge, before testing in the high rise building, and places a pressure gauge on the inlet side of the PRV. The installing contractor should have installed a ¼ inch tap with ¼ inch valve and plug on the PRV's inlet piping. Connect the test assembly to the PRV and to the drain riser and then flow test the PRV taking pressure reading from the supply side of the PRV and from the pressure gauge on the flow meter for the discharge side of the PRV. Just make sure that the 4 inch drain riser has some offsets in the vertical drop so the slug of water from the testing does not have a 600 ft straight drop to the first Ell. This test set up permits a contractor to adequately flow test the PRV's in a efficient manner with little of no damage to the contents of the building. Have a fire safe day. Jim Davidson Davidson Associates Fire Protection * Medical Gas * Code Consulting 302-994-9500 Fax:302-234-1781 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ford, Charles Sent: Tuesday, March 22, 2011 9:30 AM To: [email protected] Subject: RE: PRV Testing My original post was related to the pressure settings on existing PRV's. Don't need a pitot. Your question seems to acceptance testing of the stand pipes. Setting or verifying the PRV settings is part of the testing but it seems to me that full flow teating at the top is also required, but frankly I don't know exactly how that is done. C. Burton Ford Nicet Certified Special Hazards IV Fire alarm IV Sprinkler III Water Based Inspections I NFPA Certified Fire Protection Specialist [CFPS] Cintas Fire Protection 1038 Conshohocken Road Conshohocken ,PA 19428 610-233-1400 Fax 610-233-1401 ________________________________________ From: [email protected] [[email protected]] On Behalf Of Macris, George [[email protected]] Sent: Tuesday, March 22, 2011 9:03 AM To: [email protected] Subject: RE: PRV Testing This is a new sprinkler installation and having on site problems with testing of the PRVs for each floor in the building. The design engineer is not helpful and the installers have no clue of how to test them. Will you be able to describe how the actual test in done? I thought you also need to use a pitot tube, but how can this be done if you use a short piece of testing hose with one side connected to the drain riser and the other side just after the PRV. Thanks, George Macris,Plans Examiner/Fire Prevention Officer Markham Fire & Emergency Services 101 Town Centre Boulevard Markham, Ontario L3R 9W3 [email protected] www.markham.ca -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Eric Tysinger Sent: Monday, March 21, 2011 3:37 PM To: [email protected] Subject: RE: I have used a single 2½" female hose x male thread adapter, about a foot off the floor. Then you use a short piece of 2½" fire hose for testing. Thanks, Eric Tysinger CET NICET III - 108988 Designer Wayne Automatic Fire Sprinklers, Inc. 4370 Motorsport Drive Concord, NC 28027 p: (704)782-3032 x1751 f: (704)795-6838 C: (239)633-9703 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Monday, March 21, 2011 3:06 PM To: [email protected] Subject: Tom, Do you have a picture or a sketch of a drain riser and connections for a 2-1/2" pressure reducing hose valve? I'm having a hard time picturing how this all goes together. Also any hints on distance or arrangement would be helpful. Thanks Todd Todd G. 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