POSITIVE MATERIAL IDENTIFICATION (PMI)
APEC Inspection has added Positive material identification via LIBS analyzer to its list of NDT testing services.
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APEC Inspection - Australia's Experts in Positive Material Identification
APEC Inspection Service has added positive material identification via LIBS analyzer to its list of testing services.
Laser Induced Breakdown Spectroscopy (LIBS) is a powerful, nondestructive technique for measuring elemental composition of metals including carbon content of Fe and SS alloys as well as PMI of Ni, Ti, Cu, Co and Al alloys.
Handheld LIBS analyzers are portable devices that can be used on location for immediate, lab-quality results to help you determine the next course of action and where it’s needed in your business.
Applications:Non-destructive analysis and accurate grade identification for manufacturing quality control and assurance.
Hand held XRF's are great for the analysis of light elements (Mg to S) for fast testing of most commercial alloys, including aluminum alloys, Si and AI bronzes. It provides low limits of detection for accurate grade separation (e.g. 303-304, 6061-6063) with laboratory quality results in seconds. Analysis of welds and welding materials Verify that the alloys to be welded together are of the specified grade and chemistry. Avoid mix-ups and check the appropriate filler material is used. Confirm the weld meets specification during final acceptance tests. Verify in-service welds during positive material identification (PMI) inspection programs. Non-destructive analysis of electroless nickel coatings on steel Handheld X-ray fluorescence (XRF) analyser providing fast, accurate and non-destructive determination of NiP coating composition and thickness on steel. The combination of a high performance 50kV X-ray tube and Hitachi High-Tech’s high-resolution silicon-drift detector (SDD) provides faster analysis and lower limits of detection. Request A Quote
What Positive Material Identification Confirms
Positive material identification answers one question: is this component actually made of the alloy the paperwork says it is? Material mix-ups happen more often than people expect. A valve, a length of pipe or a weld filler can be swapped for the wrong grade during fabrication or a shutdown, and the wrong alloy in high-temperature or corrosive service can fail with serious consequences. PMI checks the chemistry on the spot, so you can verify incoming material, confirm a finished weld, validate a material test report, and keep the wrong metal out of your system before it goes into service.
XRF, OES and LIBS: Choosing the Right Method
The three handheld methods do not all do the same job. X-ray fluorescence (XRF) is quick and reads most alloying elements well, which makes it the default for sorting and grade separation. What it cannot do is measure carbon. That gap matters, because carbon is exactly what separates carbon steel from a low-carbon stainless, and it drives weldability. When carbon content is part of the spec we reach for laser-induced breakdown spectroscopy (LIBS) or optical emission spectrometry (OES), both of which read carbon directly. We pick the method to suit the alloy and the question being asked, rather than forcing one tool onto every job.
PMI Standards: API 578 and ASTM E1476
Most PMI programs are run to API RP 578, the recommended practice for a material verification program covering new and existing alloy piping systems, and ASTM E1476, the guide for metals identification, grade verification and sorting. API 578 is the one most oil, gas and process clients call up, and it sets out how much of a system to test and what to do when a component does not match. We work to the standard named in your specification and report the results in a form your QA team and auditors can use.
Why Choose APEC Inspection for PMI
APEC is a NATA-accredited inspection body, and our positive material identification is run by trained, certified technicians using calibrated handheld analysers. We test on your site for immediate results, cover piping, valves, vessels, welds and incoming stock, and fold PMI into the wider NDT and pressure vessel inspection work your assets need. To set up a PMI program or get a one-off verification done, request a quote.
Frequently Asked Questions
- What is Positive Material Identification (PMI) and when is it needed? +
- PMI is a non-destructive method to verify alloy composition and grade. It is essential for confirming correct materials in critical piping, valves, and vessels in oil and gas, chemical, and power industries.
- What PMI technologies does APEC Inspection use? +
- We use handheld LIBS analysers for carbon content measurement in steel and stainless alloys, and XRF analysers for fast analysis and accurate grade separation of aluminium and other alloys.
- Can PMI testing be done on-site in Australia? +
- Yes, our portable LIBS and XRF analysers provide immediate, lab-quality results on location, eliminating laboratory delays and minimising downtime.
- Can PMI be used to verify welds and welding materials? +
- Yes, PMI verifies that alloys being welded are the specified grade, confirms correct filler material, and checks finished welds meet specification.
- What is the difference between LIBS and XRF for PMI? +
- XRF is fast and reads most alloying elements but cannot reliably measure carbon. LIBS and optical emission spectrometry (OES) can measure carbon, which matters when you need to tell carbon steel from low-carbon stainless or check weldability. APEC selects the method that suits the alloy and the requirement.
- What standards cover positive material identification? +
- PMI is most often carried out under API RP 578, the material verification program for new and existing alloy piping systems, and ASTM E1476, the guide for metals identification, grade verification and sorting. Many client specifications call up one or both.
- Why can't XRF measure carbon content? +
- Carbon is too light an element for handheld X-ray fluorescence to detect reliably. Where carbon content is critical, for example separating carbon steel from L-grade stainless or checking weldability, LIBS or OES is used instead.
If You Have Any Query, Feel Free To Contact Us
Whether you'd like a fast quote, have a technical question, or want to schedule positive material identification, the APEC team is ready to help.
Blog Category: Positive Material Identification
Understanding Positive Material Identification
Ensuring Material Integrity and Compliance
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Understanding Laser Induced Breakdown Spectroscopy - LIBS
A Powerful Tool for Material Analysis
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Mastering Positive Material Identification in Australian Industries
Guaranteeing Material Accuracy and Compliance Nationwide.
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