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Thanks to every one gave me an answer.

Unfortunately engineering approved and materials have been purchased accordingly and are at site. There's no way to change things, only to find a way to assure no leakage will occur in the underground (buried) section of the line.

Dear TomDot/EdStainless, thank you for your suggestions regarding changing material and/or painting system but it's too late for that. My EPC contractor already has the material at site and ready to work. My question is "How to prevent the buried portion of threaded lines to leak as the fluid is...

So what can be the solution? Any suggestion?

Is there any limitation of using thread sealants as the lines will be buried (underground)? I mean is it technically acceptable to use threads sealants or it is better to have a seal weld.

our EPC contractor has chosen galvanized threaded pipes for above and underground. The underground will be HBE (High Build Epoxy) coated. My problem is that these lines belongs to Instrument Air system. How to avoid leaks? By seal welding or there's other ways by using resins or other? Thanks...

How to avoid and be sure no leaks will arise on a buried galvanized pipe for instrument air on a process plant, thanks.