scope:

This standard establishes basic requirements for conducting Positive Material Identification (PMI) tests on ferrous and nonferrous metal alloy materials using portable x-ray emission type equipment, which is currently available for production shop and construction site verification of these materials.

X-ray emission instruments are not capable of determining the carbon content of an alloy. Therefore, utilization of these instruments will not identify or confirm low-or high-carbon austenitic stainless steel ('L'-and 'H'-type) alloy grades. Other methods must be used if such identification is required.

This standard does not address material verification by methods other than usage of portable x-ray emission analysis equipment, nor is it intended to supplant the use of laboratory type testing methods as contained in ASTM A751, ASTM E353 and ASTM E354, if such level of accuracy is required.

This standard covers the verification of alloys in the form of pipe, flanges, fittings, forgings, bar, castings, plate, valves, welds, pressure retaining and supporting components of an assembly or any other components or materials specifically designated for PMI.

This standard does not establish the extent of PMI verification. When PMI is required, the purchaser specifications or purchase order, or other agreement between the purchaser and the contractor, should establish the requirement for, and the extent of the PMI testing. Definition should be given of the items to be verified by PMI and the percentage of each lot to receive PMI.

This standard does not address the safety factors associated with use of portable x-ray emission analysis equipment. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.