Technical Discussions: Re: Corrosion protection of gas pipe line

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Re: Corrosion protection of gas pipe line
Posted by: Joel A. Light (PID_1318), E-mail: jalight@stoprust.com, on December 22, 2003 at 16:13 :
In Reply to: Corrosion protection of gas pipe line posted by : ali abrar , E-mail: ali_abrar@faujifertilizer.com, on December 20, 2003 at 11:54 :
----------- Start Original Message -----------
: We have 16 in. Natural gas pipeline, burried and protected cathodically. This is 15 Km long with three overhead crossings on canals. Due to expansion of one of the canal, some portion of the line is now in contact with the canal water.
: The line is coated and wrapped with protective tapes for underground applications.
: What can be done to ensure protection of the line now in contact with water?
------------ End Original Message ------------
If the existing cathodic protection system is adequate, it should easily protect the portion of pipeline in the water as water is less resistive than soil. However, you might consider installing a permanent reference electrode in this location for occasional measurement.
I believe however that the biggest risk will likely be possible crevice corrosion at the tape to paint interface.
A very diligent visual inspection procedure should be established to insure the exterior of the pipeline remains corrosion free.
Please feel free to email me directly if you have any other questions.

Follow Ups:

Re: Corrosion protection of gas pipe line Floyd Atkinson 13:57 Jun-05-2004 (1)

Re: Corrosion protection of gas pipe line Raymond KWONG 04:09 Mar-22-2006 (0)

Corrosion protection of gas pipe line Ratan Kumar Saha 03:45 Jun-01-2004 (2)

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----------- Start Original Message ----------- : : We have 16 in. Natural gas pipeline, burried and protected cathodically. This is 15 Km long with three overhead crossings on canals. Due to expansion of one of the canal, some portion of the line is now in contact with the canal water. : : The line is coated and wrapped with protective tapes for underground applications. : : What can be done to ensure protection of the line now in contact with water? : If the existing cathodic protection system is adequate, it should easily protect the portion of pipeline in the water as water is less resistive than soil. However, you might consider installing a permanent reference electrode in this location for occasional measurement. : I believe however that the biggest risk will likely be possible crevice corrosion at the tape to paint interface. : A very diligent visual inspection procedure should be established to insure the exterior of the pipeline remains corrosion free. : Please feel free to email me directly if you have any other questions. ------------ End Original Message ------------

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