Repair of CRA Clad Pipeline

[narenr]

Hi,

As anybody come across a repair method for a Subsea Corrosion Resistance Alloy [CRA] internal clad pipeline? Please describe your experience.

Rgds Naren

Narendranath R
Pipeline engineering is made easy with state of the art computer software, visit

http://www.narendranath.itgo.com.

 

[BigInch]

What or how is it damaged?

http://virtualpipeline.spaces.msn.com

 

[narenr]

This is for planning emergency repair spares. The pipeline could be damaged by anchor drops/pulls or due to corrosion failure at welds etc.

Narendranath R
Pipeline engineering is made easy with state of the art computer software, visit

http://www.narendranath.itgo.com.

 

[BigInch]

Keep spare pipe in the warehouse and some split sleeves

http://www.oceaneering.com/PRS.asp?id=1212

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[BigInch]

BTW there are some versions (If not Oceaneering, I forget who makes them) with hydraulic actuated sealing and misalignment fittings, etc. usually for deeper water, easier to install with ROVs.

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[narenr]

Split sleeves and Mechanical connectors work well with carbon steel pipeline. Repairs for CRA clad pipeline needs to maintain corrosion resistant after repair.

Narendranath R
Pipeline engineering is made easy with state of the art computer software, visit

http://www.narendranath.itgo.com.

 

[ndeguy]

There should be approved weld and weld repair procedures debeloped at the time of project start-up. If the damage is corrosion failure at a weld then the weld repair procedure should be followed and hyperbaric welding may be necessary.

If its a section of pipeline which has suffered mechanical damage bad enough to require full replacement of the damaged section then have fabrcated a clad pup-piece of sufficient length to replace the damaged area. Then hyperbarically cut the latter and weld in place the pup-piece using the approved weld procedure.



Nigel Armstrong
Karachaganak Petroleum
Kazakhstan

 

[BigInch]

narenr,

I thought you knew that and were looking for something suitable for an emergency repair. Not to say that a claded repair clamp could not be developed.


Nigel,

The clamp system was designed as a more cost effective alternative to divers and hyperbaric welding, but if the water depth allows, why not?

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