pipeline preservation 1

[waleed.alhishmakpc.co.com]

We have a operative crude oil pipeline of lenght 10 KM. We need to isolate from th emain system and prserve it for a long period.What sort of presrvation we use and which one is better. We believe that it is better to prserve by gasoil, or diesel oil to keep tha status of such for along period and without any more major corrosion. Kindly Advice
Nitrogen is good but at teh same time their will be some corrosion will take place, because nitrogen only will reduce the oxygen content on the pipeline , at the same time we have to keep the pipeline under pressure of 1.5 bar and we should continuesly check the pressure along the pipeline
Kinldy we need your advice to presrve such pipeline with above conditions

 

[1503-44]

How long?

Dry N2 would be the best option. The pipeline can be filled at a rate which will displace all other gas to be pushed out ahead of the N2. Separation of air and N2 can be maintained if necessary during filling and drying procedures by the use of spheres or sealing pigs.

If your diesel contains water, the water will collect at the bottom of the pipe and at low spots along the pipeline. Diesel may also contain other elements, such as sulfur. Those can introduce chemical and microbe induced corrosion, so it is not the best option. I would not use diesel if you intend to preserve the pipeline for more than 1yr. If you do, try to settle or filter out any water and other deleterious materials that may be contained in that diesel.

 

[LittleInch]

I agree - Remove the crude and dry and get it as dry as you can then blow some N2 and then pack it.

Make sure you put warning signs and positively isolate the pipe to prevent nitrogen leaking out and creating danger from asphyxiation.

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