Problems with corrosion protection at the cable leads of negative grounding test piles

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I am currently in charge of a project involving a 40-km oil pipeline. There are few effective methods for preventing corrosion in the cable connections of cathodic protection test piles. Since the pipelines are buried and insulated with foam jackets, and are used to transport 65° crude oil, the welding process involves applying foam to the welds followed by wrapping them with heat-shrink sleeves; after that, holes are made to insert the cables of the cathodic protection test piles into the pipelines. This approach poses a problem in terms of sealing around the cables at these holes – heat-shrink sleeves cannot be used effectively there, and heat-shrink tape does not provide adequate coverage. Engineers specializing in corrosion prevention from the design firms say that this solution is not satisfactory, while the supervision team suggests using repair rods as an alternative. It is not clear whether this method is reasonable; everyone’s input is welcome