Tubular inspection on Heat Exchangers: IRIS (internal rotary inspection system) - what is the tolerance for method and Standard applicable?

Dear Professionals,

My question is about tubular inspection for Heat Exchangers (carbon steel tubes 1-inch inspection):  what is the tolerance for IRIS (internal rotary inspection system) method and Standard applicable?

Please suggest as per your experience, as I can't find a clear answer in ASME BPVC SecV NDE.

Thank you.

Andre K.

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