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PMI (Positive Material Identification)

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Definition: Positive Material Identification (PMI) is the analytical verification of the chemical composition of a material for unambiguous material assignment. The aim is to prevent material mix-ups in safety-relevant applications. The test is carried out with minimal destruction directly on the component.

Practical relevance: PMI is used in particular in plant, pipeline and pressure equipment construction. Typical methods are mobile X-ray fluorescence analysis (XRF) or optical emission spectroscopy (OES). The alloying elements are checked in accordance with the material specification (e.g. EN 10025, ASTM). Incorrect assignments can lead to corrosion or HTHA damage.

Decision-making perspectives:

  • Technical decision-makers: Ensuring correct material use in plants critical to media or temperature.
  • Purchasing/project management: Requirement for documented PMI test reports at goods receipt or installation.
  • Science: Assessment of the analytical accuracy and detection limits of the methods used.
  • Insurance/law: Documented material verification to safeguard against liability.

Typical testing or verification methods: Mobile XRF, spark OES, comparison with test certificates in accordance with EN 10204.

FAQ:

  • Why is PMI important in plant construction?
  • Material mix-ups can lead to serious corrosion or safety problems and must be ruled out.
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