CP for steel pipe in Steel casing
CP for steel pipe in Steel casing
(OP)
We have a 72in diameter buried CS welded steel pipe with CP protection. Specification called for road crossings by thrust boring with an 80 inch ID concrete casing. Steel line pipe was to pass through casing with annulus between the pipe and casing grouted with cement grout. Contractor has instead provided steel casing. Question is what impact does this have on the pipeline CP protection ?
Are there standard solutions for CP protected pipe passing through a steel sleeve or casing ?
Are there standard solutions for CP protected pipe passing through a steel sleeve or casing ?





RE: CP for steel pipe in Steel casing
If you are concerned with this, you could fill your steel casing with a high dielectric material (such as wax, or other products specifically designed for this) from the start. I only use a steel casing where the local code would require it.