PMI Testing Flange — How Fulihua Verifies Chemical Composition on Every Batch

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At Fulihua Pipeline Equipment, material integrity is not something we take on faith. Every batch of flanges produced at our facility undergoes Positive Material Identification (PMI) testing — an instrument-based chemical composition analysis that confirms the exact elemental makeup of each material heat before it leaves our factory.

What Is PMI Testing?

PMI (Positive Material Identification) is a non-destructive or micro-destructive testing method used to verify the chemical composition of metals and alloys. Using X-ray fluorescence (XRF) or optical emission spectrometry (OES), PMI instruments can identify and quantify the major alloying elements in a material sample within seconds.

Our PMI Process — Step by Step

Step 1: Surface Grinding The flange surface is ground to remove oxidation, scale, and coating — exposing fresh, unoxidized base metal for an accurate reading.

Step 2: Cooling The ground sample is allowed to cool completely. Residual heat from grinding can affect spectrometer readings, so temperature stabilization is essential for accurate results.

Step 3: Surface Cleaning The test area is wiped clean to remove grinding debris, oil, and any surface contamination that could interfere with the instrument reading.

Step 4: Spectrometer Analysis The sample is placed in contact with our PMI analyzer. The instrument fires an X-ray or spark at the metal surface and measures the energy spectrum of the returning radiation — identifying and quantifying each element present.

Step 5: Results Verification Chemical composition results are displayed instantly on screen. Our quality control team compares each element — Carbon (C), Silicon (Si), Manganese (Mn), Chromium (Cr), Molybdenum (Mo), Nickel (Ni), Vanadium (V) and others — against the material specification and mill certificate.

Only batches that pass PMI verification proceed to final inspection and shipment.

Why PMI Matters for Your Supply Chain?

Material substitution and heat mix-ups are well-documented risks in global industrial supply chains. PMI provides independent, instrument-based verification that the material you specified is the material you receive — not just a manufacturer's declaration.

For critical applications in oil and gas, petrochemical, power generation, and pressure piping systems, PMI is not optional — it is essential.

Full Quality Control & Documentation

Every Fulihua shipment includes: - Mill Certificate (EN 10204 3.1 or 3.2) - PMI Test Report - Hydrostatic Pressure Test Certificate - Dimensional Inspection Report - Tensile & Hardness Test Results (on request)

Contact Us 📧 sales@flhmetal.com 🌐 www.flhmetal.com

Fulihua Pipeline Equipment — You Can't Fake Chemistry.