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chama2633
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Canada - Member - New Member

Join Date: Feb 2008
Location: Muscat, Sultanate of Oman
Posts: 54

CO2 Pipelines

11/15/2008 1:21 AM

Gents and Ladies

We are designing a CO2 pipeline, 99.8% CO2 using GRE pipe.

What material should one use for valve trim and other metal components such as oriface fittings?

Many thanks,

chama
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ducon
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Join Date: Dec 2006
Location: Hop around Toronto, New York & Karachi
Posts: 1876
Good Answers: 19
#1

Re: CO2 Pipelines

11/15/2008 7:04 AM

Easy - Hire Consultant to do it. You are already not aware of the materials how do you expect to undertake the engineering & designing???

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chama2633
Associate
Canada - Member - New Member

Join Date: Feb 2008
Location: Muscat, Sultanate of Oman
Posts: 54
#4
In reply to #1

Re: CO2 Pipelines

11/16/2008 9:12 PM

There is one in every group, SA.
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hayestp
Member

Join Date: Oct 2008
Location: Gateway to the North
Posts: 7
Good Answers: 1
#2

Re: CO2 Pipelines

11/16/2008 9:18 AM

The real question I have with repect to this CO2 pipeline is ensuring there is no water in the CO2. Water in these operation cause the subsequent byproduct called carbonic acid.

Can you ensure that the pipeline will remain dry (100%) at all times?

What processes are you dploy prior to product delivery to ensur eno water content?
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chama2633
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Canada - Member - New Member

Join Date: Feb 2008
Location: Muscat, Sultanate of Oman
Posts: 54
#5
In reply to #2

Re: CO2 Pipelines

11/16/2008 9:19 PM

havestp

Many thanks.

The CO2 is saturated with water. That is the reason we are using GRE pipe. What I was concerned about was the parts of the system that will remain as a metal, orifice fittings and valves.

What trim material for the valves? What material for the orifice fitting?
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Anonymous Poster
#6
In reply to #5

Re: CO2 Pipelines

11/17/2008 12:17 PM

Stainless steel is always a good option for highly corrosive environments.
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cub3bead
Participant

Join Date: Apr 2008
Posts: 3
#3

Re: CO2 Pipelines

11/16/2008 1:45 PM

A number of years ago a CO2 pipeline was built from NE New Mexico to the Permian Basin in Texas. The source was a native deposit of CO2 which was to be used for tertiary oil flooding. The designers were concerned about formation of carbonic acid such that the 16" pipeline is stainless steel for corrosion resistance.

You might want to HAZOP the material selection as a leak could cause a serious environmental liability especially if routed near population centers.
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