1 reply to this topic

[andybud]

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

•  hipps.jpg   55.59KB   2 downloads

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

[breizh]

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.