[Testlablcwusers] Test Lab LCW System Low Flow

[Philip Denny]

Sam

I just went up there at 9am and throttled it back to where the bypass has historically been. Closing down the bypass increases pressure everywhere else and back roughly to where should be.

I documented  the 70 GPM back in 2019 when the klystrons were running and Leonard told me that was the proper flow. If it is 35-40gpm is correct, then that's fine, your the expert. Therefore the S/R needs to be adjusted as well.

Phil









________________________________
From: Sam Holben <holben at jlab.org>
Sent: Monday, July 29, 2024 9:41 AM
To: Philip Denny <denny at jlab.org>; Michael Drury <drury at jlab.org>; David Kashy <kashy at jlab.org>; Carroll Jones <jonesc at jlab.org>; testlablcwusers at jlab.org <testlablcwusers at jlab.org>
Cc: Mike Sprouse <msprouse at jlab.org>; David Sulouff <sulouff at jlab.org>; James Beason <beason at jlab.org>
Subject: Re: Test Lab LCW System Low Flow

Phil,

It looks like the bypass is barely open.  The flow inside the HPA is a lot higher than it should be.  65+ gpm.  The nominal flow in the HPA should be 35 to 40 gpm.  I am not sure why the flow is so high.  We can not adjust the flow inside the HPA due to the safety pause, but it can be regulated with the valve outside at the supply manifold.  This high flow rate in the HPA may explain the low pressure in the system.  There is new signage that states the  flow should be 70 gpm.  I do not know who added this signage or for what reason.  Our part of the system only requires 35 to 40 gpm.  Mike do you have any input as to the reason for the flow increase?
Sam



________________________________
From: Philip Denny <denny at jlab.org>
Sent: Monday, July 29, 2024 8:39 AM
To: Michael Drury <drury at jlab.org>; Sam Holben <holben at jlab.org>; David Kashy <kashy at jlab.org>; Carroll Jones <jonesc at jlab.org>; testlablcwusers at jlab.org <testlablcwusers at jlab.org>
Cc: Mike Sprouse <msprouse at jlab.org>; David Sulouff <sulouff at jlab.org>; James Beason <beason at jlab.org>
Subject: Re: Test Lab LCW System Low Flow

I believe they want to keep a small amount of flow through the klystron hx when not in use. I will go upstairs and throttle it back to where I believe it should be.

Get Outlook for Android<https://aka.ms/AAb9ysg>
________________________________
From: Testlablcwusers <testlablcwusers-bounces at jlab.org> on behalf of Michael Drury <drury at jlab.org>
Sent: Monday, July 29, 2024 8:34:12 AM
To: Sam Holben <holben at jlab.org>; David Kashy <kashy at jlab.org>; Carroll Jones <jonesc at jlab.org>; testlablcwusers at jlab.org <testlablcwusers at jlab.org>
Cc: Mike Sprouse <msprouse at jlab.org>; David Sulouff <sulouff at jlab.org>; James Beason <beason at jlab.org>
Subject: Re: [Testlablcwusers] Test Lab LCW System Low Flow

I am unaware of a need to have the bypass open.
Mike D.

Sent from my T-Mobile 5G Device
Get Outlook for Android<https://aka.ms/AAb9ysg>
________________________________
From: Testlablcwusers <testlablcwusers-bounces at jlab.org> on behalf of Sam Holben <holben at jlab.org>
Sent: Monday, July 29, 2024 8:02:42 AM
To: David Kashy <kashy at jlab.org>; Carroll Jones <jonesc at jlab.org>; testlablcwusers at jlab.org <testlablcwusers at jlab.org>
Cc: James Beason <beason at jlab.org>; David Sulouff <sulouff at jlab.org>; Mike Sprouse <msprouse at jlab.org>
Subject: Re: [Testlablcwusers] Test Lab LCW System Low Flow

Carroll,

At this time there should not be any reason for the CMTF LCW bypass to be open.  That said, check with Mike Drury and his group to see if there has been a need for the bypass to be open.  We only open the bypass when the HPA LCW valves are closed.  Our understanding is there is a possibility for the system to be "dead headed" if there is no flow upstairs.  Hence the need for the bypass.  I hope this answers some questions.

Sam
________________________________
From: Testlablcwusers <testlablcwusers-bounces at jlab.org> on behalf of David Kashy <kashy at jlab.org>
Sent: Monday, July 29, 2024 7:38 AM
To: Carroll Jones <jonesc at jlab.org>; testlablcwusers at jlab.org <testlablcwusers at jlab.org>
Cc: Mike Sprouse <msprouse at jlab.org>; David Sulouff <sulouff at jlab.org>; James Beason <beason at jlab.org>
Subject: Re: [Testlablcwusers] Test Lab LCW System Low Flow

Hi Test Lab LCW Users,
Yes, we see the low supply pressure here in the MOLLER area of the test lab too. The supply/return pressurses as read on the gages outside the control room now read 78/30 psig. At 40psid we would not be able to run our magnet testing program. We will not need to do that for many months, but we all need to be good stewards of the system and use the minimum necessary to allow flexibility for all to operate as needed. With that said we (MOLLER) when we do run the magnets will likely take enough flow to drag down the supply pressure and thus we plan on giving 4 week notice or more to allow us all to share this critical resource.

Please check your systems for open bypass valves or other load which could be throttled when not in use.

Thanks
Dave Kashy


________________________________
From: Testlablcwusers <testlablcwusers-bounces at jlab.org> on behalf of Carroll Jones <jonesc at jlab.org>
Sent: Friday, July 26, 2024 5:21 PM
To: testlablcwusers at jlab.org <testlablcwusers at jlab.org>
Cc: James Beason <beason at jlab.org>; David Sulouff <sulouff at jlab.org>; Mike Sprouse <msprouse at jlab.org>
Subject: [Testlablcwusers] Test Lab LCW System Low Flow

Phil Denny informed me that there was a report of Test Lab LCW flow lower than normal.  Supply pressure was confirmed significantly lower than normal (95 versus 130 PSIG).  I checked the basement pump and piping.  The bypass valve around the pressure control valve was cracked a little which resulted in an increase of about 15 PSIG when closed or supply pressure of 110 PSIG.  I then determine a little flow is leaking pass the control valve which if corrected could increase supply pressure about 4 PSIG,  I will have troubleshot by our controls subcontractor.  The 4 PSIG will not restore the system to normal operating supply pressure so I continued looking at the system and valve configuration in the highbay area.  I found the bypass between supply and return piping south of the klystron racks on the mezzanine is fully open.   I believe if the bypass valve is closed, system pressure will return to normal.  I left the valve open in case it was opened for a reason that I am unaware.  Recommend this valve be closed by user supporting the klystron racks and system supply pressure checked.

For additional information or clarification, please contact me at 757-876-1778.

Sincerely,

Carroll W. Jones


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/testlablcwusers/attachments/20240729/c380e78f/attachment-0001.html>