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Time To Pressurise - Leakage Through Hipps Valve

pressurisation pipeline hipps leakage

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#1 andybud

andybud

    Junior Member

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  • 12 posts

Posted 06 July 2020 - 06:31 AM

Hi All,

 

I have an estimated leakage of 7 MMSCFD through a HIPPS valve. I'd like to know how to calculate the length of time it would take to pressurise the downstream system to 140 barg, (a pipeline with 1000 m3 volume)

 

Attached is a sketch.

 

The HIPPS will close at 138 barg. The downstream design pressure is 140 barg, in a 900 lb system. The system upstream of the HIPPS is a 2500 lb system, designed for 385 barg.

 

Downstream of the HIPPS is a 4km long pipeline (24 inch) with a volume of 1000 m3..

 

So in summary, pressurisation of a 4km long pipeline, starting from a pressure of 138 barg, ending at 140 barg , with upstream pressure of 385 barg to use as pressurization source.

 

I thought it would be easy, but now i'm just confused, so any help would be greatly appreciated. thanks

Attached Files


Edited by andybud, 06 July 2020 - 06:39 AM.


#2 breizh

breizh

    Gold Member

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Posted 07 July 2020 - 02:37 AM

https://pdhonline.co...m377content.pdf

 

Hi ,

Let you consider this resource  (above) , similar to the time required to fill a capacity from initial P2 to final P1 at a rate of Q 

 

t= V*( P1-P2) /(Q*Pa) 

with the proper units 

t =time '

V =volume cuft

Pa= atmospherical pressure 14.7 PSI

P1 =max pressure (final)

P2 = min pressure (initial)

Q = flow rate of gas CFM , not SCFM 

Hope this is helping you.

Breizh 


Edited by breizh, 08 July 2020 - 12:28 AM.





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