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Q. Explain about Postweld Heat Treatment?
Pressure vessels shall be postweld heat treated per applicable sections, in accordance with applicable material specifications or when specified by the User, due to service such as ammonia, caustics, amines, or wet hydrogen sulfide. Alternative Postweld Heat Treatment Requirements For Carbon And Low Alloy Steels, shall not be employed.
PWHT provides reduction of residual stresses, due to forming and welding, and results in softening of heat affected zones. Some steels can be damaged within certain temperature zones below PWHT temperature. A Materials Engineer shall be consulted regarding the need for postweld heat treatment, and dependent on service conditions. The resulting recommendation shall be included on the Data Sheet.
Q. What is Auto-Ignition Temperature? Auto-Ignition Temperature (AIT) - The auto-ignition temperature is the temperature at which a product will burn without application of any
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how to find view factor for a cylinder to humanbody at a distance?
Magnetic Alloy Steels: These steels are divided into two sets. Such which retain their magnetism and that which do not. The steels which retain their magnetism are termed as
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