ASME SA335 pdf download SPECIFICATION FOR SEAMLESS FERRIITIC ALLOY-STEEL PIPE FOR HIGH-TEMPERATURE SERVICE 13.2 The following information is for the benefit of the user of this specification: 13.2.1 The reference standards defined in 13.8 are convenient standards for standardization of nondestructive examination equipment. The dimensions ofthese standards should not be construed as the minimum size imperfection detectable by such equipment....