Clean Steam Piping Testing under B31.3

Uner B31.3, would clean steam tubing, orbitally welded, 60 psig require X-ray testing? As I understand it, Category D service fluids don't require X-ray testing.

Clean steam service meets the design pressure and temperature (-20F to 366F) requirements for Category D. It also meets the nonflammable and nontoxic requirements for Category D.

The only requirement it might not meet is tne "not damaging to human tissues as defined in para 300.2" requirement. I'm not sure how to interpret this since it seems as if any fluid at 365F would be "damaging to human tissue" yet a fluid at 365F would fall under the Category D definition.

 

[prex]

I would interpret this as a fluid that has a chemical action onto human tissue, so that to avoid the damage is not simply a matter of escape or protection with a shield. A steam leak would be dangerous only if someone is subject to a jet and cannot move.
Moreover, as you note, the effect of temperature only cannot be under the definition of non damaging to..., as otherwise the definition of Category D would be useless.
prex
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Damaging to human tissue is under the condition of leakage. Class 150 steam can be classified as Category D (the temperature/pressure limits of Category D are specifically chosen to include it). However, it is the owner of the facility that must make the selection. They could elect, for example, to classify it as normal fluid service even thought it is permissable to classify it as Category D.