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For below ground diesel piping, can I use 2 layers of coal tar epoxy coating instead of 3LPE?

I'm looking into calculating the total load of a 10" fuel gas pipe and a 4" condensate pipe to be placed on a straight run of 10 concrete pipe sleepers spaced at 12m. The test result of the concrete compressive strength (28 days cube break) came out to be around 15 MPA (Spec calls for 27.6 MPA...

Thank you racookpe1978. The fastener is an A193 Grade B7 Chromium-Molybdenum Alloy Steel stud bolt chosen for its corrosion resistance and high-temperature strength. The Fluoropolymer coating (bluing), topcoat is intended to reduce friction during tightening.

Thank you SK10009 for your input. Thats what I thought would be good.

The paint on hex nuts and bolts was affected by sandblastng operation done on flange joint piping. No mechanical damage was noticed on the body, face or thread of nuts and bolts. The bolts are torqued and the line is in service. My question is do we need to replace the affected bolts or just...