Gas line Depressurisation
Gas line Depressurisation
(OP)
Gents,
Could any one advise a method to calculate the time depressurise a Gas line with following details:
1- Length = 65616.6 ft
2- inside Diameter (ID) = 10"
3- Pipe pressure =1200psa
4- Temp 60oF
we need to depressurise the line before starting some works on the system.
Thanks
KOKA11
Could any one advise a method to calculate the time depressurise a Gas line with following details:
1- Length = 65616.6 ft
2- inside Diameter (ID) = 10"
3- Pipe pressure =1200psa
4- Temp 60oF
we need to depressurise the line before starting some works on the system.
Thanks
KOKA11





RE: Gas line Depressurisation
After you get below 1 atm, the flow rate is no longer choked and the blowdown time is very difficult to determine. I always try, but I'm never very close. I can get the first chunk within seconds, but seldom get the second chunk within tens of minutes.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The Plural of "anecdote" is not "data"
RE: Gas line Depressurisation
I made a few assumptions so the program will run as follows.
One 3" ID blow down stack
Lubricated plug valve in stack.
I came up with 133 minutes
Let me know if these are incorrect and I'll try it again for you.
Pat