Non-Destructive Testing (NDT) refers to the use of heat, sound, light, electricity, magnetic changes in reaction, such as physical or chemical methods, with the help of modern technology and equipment, for the inspection of industrial pipe fittings and components. It is used to evaluate the structure, state and type, quantity, shape, nature, position, size, distribution and changes of the internal and surface of the test piece. Methods of inspection and testing include Radiographic Testing (RT), Ultrasonic Testing (UT), Magnetic Particle Testing (MT), and Liquid Penetrant Testing (PT)—crucial for ensuring the quality and integrity of industrial pipe fittings, pressure equipment, and critical piping systems.
All PT test on bevel ends for smls fittings shall be in accordance with ITP
UT thickness Gauging for wrought Fittings as per ITP.
IGC testing for smls fittings shall be ASTM A262 in accordance with ITP.
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ASTM A262 Practice “B” with acceptance criteria of “60” mils/year (max.)”. Or ASTM A262 Practice “E” with acceptance criteria of “no cracks as observed from 20X magnification” & “microscopic structure to be observed from 250X magnification”. 2.7.4 When specifically asked for in specification for high-temperature application of some grades of austenitic stainless steel (e.g. SS309, 310, 316, 316H etc.) ASTM A262 Practice “C” with acceptance criteria of “15 mils/year” shall have to be conducted.
Here are some commonly used NDE methods for pipe fittings:
