How much higher is the pressure and where is the base of the riser compared to the location of the gauge?
Pete From: Brad Casterline <[email protected]> Sent: Monday, September 26, 2022 9:48 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Re: [EXTERNAL] Re: Pressure on placard greater that static. A Main Drain Test would be interesting if this was the case! The pressure would drop as the valve is being opened, then at some point start climbing. Most ‘everyday’ system demands can be flowed out the Main Drain, especially if it is 2”. I’ve never seen or heard of a Main Drain Test where the residual is higher than the static, but then, I don’t get out much. I think step 1 in trouble shooting this water supply quandary is to verify the gauge is working right. I know we record Main Drain Tests to keep our eye on the water supply over time, and nowadays we can use them to estimate the flow when exercising a BFP. Brad From: Matthew J Willis <[email protected]<mailto:[email protected]>> Sent: Thursday, September 22, 2022 4:37 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]<mailto:[email protected]>> Subject: [EXTERNAL] [Sprinklerforum] Re: Pressure on placard greater that static. Might be some city pumps kicking in you do not know about. R/ Matt Matthew J. Willis, CWBSP Design Manager Rapid Fire Protection, Inc. 600 E. Carlson St. Suite AB | Cheyenne, WY. 82009 Office (307) 426-4077 ext. 404 Direct (307) 316-6630 Cell (605) 391-2733 [cid:[email protected]] From: Fpdcdesign <[email protected]<mailto:[email protected]>> Sent: Thursday, September 22, 2022 2:23 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]<mailto:[email protected]>> Subject: [Sprinklerforum] Pressure on placard greater that static. I have run into a couple of situations where the required pressure as shown on the system placard is less than the static pressure on the riser. I found another one today during a survey. If others are finding this, how do they handle it? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell)
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