Estbalishing PMI Testing Procedures

What are PMI Standard Operating Procedures?

Standard operating procedures are detailed instructions on how to carry out a particular job.  For positive material identification, PMI testing, these instructions will describe exactly how the sample is to be prepared, what type of instrument should be used for the specific type of data needed, how to ensure the instrument is calibrated, and ultimately how to perform the test.  Establishing proper standard operating procedures will also provide verification of results and traceability.

 

Why Is It Important to Establish PMI Testing Procedures?

PMI testing procedures are necessary to reduce operator to operator differences in testing. In addition, companies want to ensure the results are accurate from test to test. Standard operating procedures ensure that each person doing the testing is performing the test exactly the same and the results can be trusted. Putting standard operating procedures in place ensures the operators verify the instrument is working optimally before performing the test, which assists in traceability and reliability of the results.

 

Establishing the PMI Test Standards

Verichek’s staff of trained technical engineers regularly assists companies in setting up standard operating procedures.  The technical engineer will ensure the operators are properly trained on the operation of the OES instrument, know how to establish and verify calibration, and ensure the operators understand how to resolve minor issues if the instrument is found to be out of calibration. Being able to keep your instruments in calibration will reduce downtime and ultimately save money.

 

Traceability

When producing metal components for various industries, traceability becomes very important.  End customers need to be able to follow the supply chain backwards to find where failures may have potentially occurred.  Having standard operating procedures in place and maintaining accurate documentation on calibration and test results will ensure the parts you are producing meet the requirements and you have the proof to stand behind all your testing.

 

Understanding PMI Test Results

Interpreting PMI test results is crucial for material verification. Here’s how to understand these results and what they imply:

• Elemental Composition: The PMI test results will show the elemental composition of the material. Compare these results against the expected composition to verify material identity.
• Accuracy and Precision: Look for consistent results across multiple tests to ensure the accuracy and precision of the measurements.
• Common Challenges: Be aware of potential challenges such as contamination, equipment calibration issues, and operator errors. Regular maintenance and calibration of the testing equipment can mitigate these issues.
• Troubleshooting Tips: If results are inconsistent, check for common problems like instrument malfunction, improper sample preparation or operator error. Address these issues promptly to maintain the integrity of the testing process.

FAQs about PMI Testing Procedures

 

What is the method for detection of PMI?

PMI detection typically involves the use of techniques such as X-ray fluorescence (XRF) or optical emission spectrometry (OES). These methods analyze the elemental composition of the material by measuring the characteristic wavelengths of emitted radiation.

What is the ASTM standard for PMI testing?

The ASTM standard for PMI testing includes guidelines and procedures for performing PMI tests to ensure consistency and accuracy. ASTM E1476 and ASTM E1916 are commonly referenced standards that provide detailed methodologies for PMI testing in various industries.