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Positive Material Identification Certification (PMI)

Prevent Mechanical Failure Due to Non-Specified Materials

What is positive material identification?

The American Petroleum Institute (API) and other industry associations have issued recommended practices for material verification. These positive material identification (PMI)-related practices are intended to help chemical, oil and gas producers prevent a mechanical or system failure related to the use of non-specified materials, which could lead to a release of potentially hazardous or polluting substances. For these reasons, a material verification program that conforms with API-recommended practices is an essential aspect in most quality assurance programs.

What are the advantages of positive material identification?

PMI testing and evaluation techniques are widely used as part of quality control programs in petrochemical facilities, power generation plants and steel and iron foundries. PMI techniques generally provide a cost-effective method for sampling large volumes of materials during the manufacturing process or on-site. In addition, results are immediately available, allowing for the efficient identification of non-conforming materials.

Why use TÜV SÜD for your positive material identification requirements?

TÜV SÜD Chemical, Oil and Gas offer material verification programs and services that meet or exceed the requirements of the refining, petrochemical and energy industries as well as API-recommended practices. Our PMI specialist utilize the most advanced technologies to conduct both qualitative and quantitative material verification, including x-ray fluorescence (XRF) and optical emission spectroscopy (OES). These technologies literally bring the metallurgical laboratory into the field to verify the quality of base components and joining materials such as welding, bolting and gaskets.

Our services at a glance

TÜV SÜD PMI testing and assessment services include:

  • X-ray fluorescent (XRF) testing and analysis - XRF testing and analysis relies on a low voltage x-ray generator that emits radiation and generates a specific response back from the material under test. Testing results are immediately available. XRF is most appropriate when an evaluation must be conducted while equipment remains in service.
  • Optical emissions spectrometry (OES) testing - OES testing involves the use of probe that vaporizes a small amount of the material under test. This vapour can then be detected and analysed with specially-designed optical equipment.

In addition to these services, TÜV SÜD also offers material verification programs that meetthe current versions of API RP 578 and other relevant standards, as well asconsultation for material verification and PMI programs. Finally, our PMI specialists can qualify and train XRF and OES operators for routine in-house assessments and verification.


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