Nondestructive Testing service providers

  Acceptance Criteria for Liquid Penetrant Testing -LPT as per ASME , AWS and API standards Liquid penetrant testing  simply called as PT. Sometimes Dye Penetrant Testing is a surface defect detection NDT  method and is more sensitive to all kind of surface defects, such as cracks , porosity, hot tears, laps, etc. The NDT methods are trained by NDT Training Institutes with their NDT courses, and the LPT is one among the basic Non Destructive Testing Methods. Various international standards for Liquid Penetrant Testing are as below ASME Boiler and Pressure Vessel Code BPVC- Section V – Article 6 and Article 24 ASTM E-1417 (ASTM Standard) ASTM E-165 (Penetrant Testing Standard for general Industry ASTM Standard) ISO 3452-1 (ISO Standard) SAE AMS 2644 (Aerospace Standard) AS 2062 (Australian Standard ) DIN EN 571 The Indications are evaluated as per Clients Acceptance Criteria or the Product Standard in conformance with the clients acknowledgement . Few examples of product s...

  LIQUID PENETRANT EXAMINATION (PT) Pentrant Testing is surface defects detection method, the method can be used on any material ( i.e: Ferrous/ non-ferrous, conductive/ non conductive, metals/ non metals) But PT is limited to materials having porous surface or very rough surface. PT can be carried out on castings, raw material, machined faces and weld joints. It is more often used in Austenitic Stainless Steels, where MPI inspection is not practically possible.   Most standards insist that the penetrant materials used, should not contain contaminants that spoil the quality of weld and metals.( contaminants such as Sulphur, Chlorine & halogens )   Penetrant materials are mostly suitable for materials with surface temperature less than 52°C. Therefore the weld has to allowed to cool before carrying out PT test on it. Liquid penetrant testing principle Any PT inspection on elevated temperature (temperature other than 4°C to 52°C), should have special ...