[Dsg-rich] flow capacity

[Amrit Yegneswaran]

george, thanks for the info. 
@500 gallons, we should still have~20 days worth of N2. 



From: "George Jacobs" <jacobsg at jlab.org> 
To: "Amrit Yegneswaran" <yeg at jlab.org>, "dsg-rich" <dsg-rich at jlab.org>, "Bob Miller" <rmiller at jlab.org>, "Stepan Stepanyan" <stepanya at jlab.org>, "Volker Burkert" <burkert at jlab.org>, "Maurizio Ungaro" <ungaro at jlab.org> 
Sent: Thursday, November 30, 2017 4:53:39 PM 
Subject: Re: [Dsg-rich] flow capacity 

Hi Amrit, 

The Hall B dewar is filled automatically when level drops to 500 gallons. The LN2 trucks arrive daily to fill all the accelerator tanks, we are simply tagging along for the ride. 

George 

On 11/30/2017 3:48 PM, Amrit Yegneswaran wrote: 



george, 
it appears that for the forward carriage, we need 60,000 L/day of N2 (for LTCC and RICH [EC not included]). 
the pipe on the forward carriage is 500 ft long and 0.5" in diameter. 
at the input to the valve panel the pressure is 35 psi. 
the exit pressure is ~15 psi, i assume. 
the dewar is 1500 gallons ~5678 liquid liters ~ 4,000,000 gas liters. 
so, i reckon the dewar contains ~66 days worth of N2. 
how frequent is the N2 refills? 
i think we should top up the dewar when it is half full. 
amrit 



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