Liquid Penentrant in the Energy Industry

            The energy industry includes the gas & oil, nuclear, gas turbine, and wind energy sectors. These sectors rely heavily on liquid penetrant for the inspection of welds, valves, and turbine blades. Red dye liquid penetrant inspections usually involve the use of aerosols because a field technician can perform the inspection with limited or no access to water, power, special lighting, or equipment that is required as with fluorescent penetrant inspection.

            Liquid penetrant inspection materials must be certified to meet the elemental requirements of the ASME Boiler Pressure and Vessel Code (BP&VC). Met-L-Chek inspection materials are certified to BP&VC, meting the low parts per million content of sulfur, chlorine, and total halogen requirements. In addition to BP&VP, Met-L-Chek red dye inspection materials are AMS 2644 certified.

Approved Met-L-Chek Materials

Type 2 – Red Visible Dye Penetrant

Method A & C: VP-30

Method A & C: VBP-300, biodegradable

Method B & C: VP-31A


Method B: E-57


Form d: D-70 non aqueous


Solvents: E-59A, R-503, R-504

Alkaline: 300LF