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SPENCEK
Participant

Join Date: Nov 2006
Posts: 3

Pipeline Export Issues

11/15/2006 2:48 AM

A gas field has an 8" export pipeline running to a main power station. The field development states that up to 70 MMscf/d of gas is to be exported to this power station. The gas is exported from the platform at a pressure of up to 130 bara.

For reasons best known to themselves, the power station has requested that the gas must be delivered at 80 bara.

Question 1.

Is the maximum platform export pressure sufficient to satisfy this request?

Question 2.

Will there be spare capacity available in the gas export pipeline to increase gas production in the future?

Information

Sea temperature 5 °C
Inlet gas temperature 35 °C
Length 43 km
Pipe internal diameter 190 mm
Roughness - e 0.03 mm
Mole weight, M 19.5 kg/kmol
Gas viscosity 0.011 mPa.s (cP)

Ignore any elevation changes.
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Anonymous Poster
#1

Re: Pipeline Export Issues

11/16/2006 4:40 AM

Can you let me know chemical composition of gas and I will make calculations to answer your questions.
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SPENCEK
Participant

Join Date: Nov 2006
Posts: 3
#2
In reply to #1

Re: Pipeline Export Issues

11/16/2006 5:10 AM

The chemical composition of the gas is rich in C2+. Its a NGL with the parameters as outlined in the question. please use this too.

Mole weight, M 19.5 kg/kmol
Gas viscosity 0.011 mPa.s (cP)

I hope to see your solution soonest.

thanks

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Anonymous Poster
#3
In reply to #2

Re: Pipeline Export Issues

11/16/2006 9:19 AM

In the absence of complete chemical composition, I am unable to match the viscosity and average molecular weight you have given. (How can a gas of molecular weight of 21 be rich in C2+ whereas C2 itself has a molecular weight of 30). So, please give me complete chemical composition in order for me to calculate loss of pressure in the line.

Is it a liquid (you say NGL !) or gas?

By the way, my preliminary computation (using guessed composition) shows that it is either too high pressure loss in the line or at best it is going to be a close call. Therefore availability of good quality data is mandatory. So, please give composition, tell me what phase (gas or liquid) it is, and also (if possible) give your base condition for measurement of Standard conditions in your 70 million 'S' CF/Day.

I wait for your input.

Regards
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