I think he meant that the pressure should drop if water flows from the pressure relief valve, while he is manually opening it. Yes, the pressure should drop at least a little bit when you are discharging water.
With pressures that high, I assume this is a system with a fire pump and jockey pump feeding it? Do you have access to the pump room or any other location that has gauges? Sounds like a broken/stuck gauge to me, but might be worth more investigation. Or, just replace the gauge and see if that solves it. -Kyle M From: Ken Wagoner <k...@parsleyconsulting.com> Sent: Saturday, March 2, 2024 9:26 AM To: sprinklerforum@lists.firesprinkler.org Subject: [External][Sprinklerforum] Re: Fire sprinkler system pressure Eli, The pressure relief valve should operate whether any water is flowing or not. My understanding from several different manufacturer's I've checked with is that for such pressure relief valves which are not field adjustable, they are factory set to relieve at 175, 200, 225, or 300 psi. It would be worth investigating what factory relief setting was selected at installation. In reference to the statement of the tech that 'most systems don't have a pressure dial', color me dubious at that comment. I note that -13 requires a pressure gauge to be installed which causes me to wonder what he might have been describing. As for the gauge - I did not intend to refer to a "water-filled" gauge, rather I believe I described a "liquid filled gauge". I remember that I didn't describe the specific liquid, however what I've used in the past was a gauge relatively filled with glycerine, as it tended to dampen - or slow down - the fluctuations in the readings from the needle. Current AFSA president Bob Caputo taught me the value of that many years ago when he described attempting to get an accurate number from a bouncing gauge during a flow test. sincerely, Ken Wagoner, SET Parsley Consulting 500 West Mechanic Street Harrisonville, Missouri 64701-2235 Phone: (760) 745-6181 Visit the website<https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.parsleyconsulting.com%2f&c=E,1,Y5zKJKPEh1mBEBqSR-VE9cUKl5y-eyP8BpvmE_5j9ZqW2eJbNphYzrCMBZ-2YuX6d-RRkHI4gQ1FV-cvOeCfRC58uZS9NiToZv2mx7909oCqLvCW_n5hDHeK&typo=1> On 3/1/2024 4:11 PM, eligru...@yahoo.com<mailto:eligru...@yahoo.com> wrote: Thanks for the reply. I'm guessing it's a defective gauge because opening the pressure valve should reduce the pressure as long as the water flows, right? When I had the pressure release valve replaced 5 years ago the tech said most systems don't have a pressure dial because they are rarely accurate, but since I already had one he replaced it. Would a water filled gauge be more accurate and last longer? _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org>
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