It depends on the goal of the coating . . .
Anything that insulates the surface will elevate the material temperatures of the pipe. That will reduce the oxidation life of the pipes (and fatigue strength). If the benefit is worth the lower life then, mission accomplished.
This why Larry Vetterman recommends no outside coatings.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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