My brother, what NDT techniques do you want to apply?

For inservice pipeline, pressure and fluid content have very small effect maybe in some cases doesn't have effect at all.

But temperature can affect the result of inspection and in some case can broke your equipment. Why broke?

Because many inservice pipeline usually in hot temperature condition.

NDT techniques usually use for pipeline is UT (Conventional UT and LRUT), so we must use hot probe for hot pipeline.