DRYING OF A 50KM PIPELINE THAT IS NOT BEEN BRUSHED 1

[UNIQUE0]

Dear Sirs/Madams

We are trying to dry a 26" pipeline (50km) and after propelling 10 foam pigs by dry air (-40C dew point)the dew point of the end of line did not reach below +26C !!!
We now know that this pipeline is corroded internally and we have a 0.4mm oxide film in its internal wall ,and as you know the wall condition of a pipeline is a very important parameter in drying of it. the corrosion is due to lack of corrosion inhibitor in pipeline during last 3 years the pipeline were filled by sea water!

So please guide me what can we do now ? We need +7C dew point air at the end of line.What is the best way to dry this pipeline ?

We can not propel brush pigs in this line because we have not enough time to do this.

 

[BigInch]

Buying time to do the work correctly is the best solution.

"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.

"Being GREEN isn't easy." Kermit

http://www.youtube.com/watch?v=hpiIWMWWVco

http://virtualpipeline.spaces.live.com

 

[GregLamberson]

UNIQUE0

You haven't mentioned what kind of service this pipeline is for. If I were an operator and my pipeline had sat for 3 years as this one had, I would want to check out the condition of the pipeline 1st with a smart pig run.

You stated -40C & +7C dew points, not sure how you jumped from -40 to +7 on the requirements, but for +7C, alcohol or methanol should get you there.

Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website:

http://www.oil-gas-consulting.com

 

[BigInch]

Greg, its not the requirement, I took it as the -40 being the dew point of the dry air he used. Pretty dry and little results to show for it. Just goes to show you how rust does tend to hold a lot of water and how useless it is to hope that it will give it up easily.

"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.

"Being GREEN isn't easy." Kermit

http://www.youtube.com/watch?v=hpiIWMWWVco

http://virtualpipeline.spaces.live.com