Non-destructive testing ratio for low-temperature heat exchangers
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I am currently working on a liquid chlorine vaporizer. The fluid flow is liquid chlorine and gaseous chlorine in the tube side, with a design temperature range of -30 to 60 degrees Celsius; hot water flows in the shell side, with a design temperature of 90 degrees Celsius. What is the required percentage for local non-destructive testing on the shell side – 20% or 50%? Thank you!
Not less than 50% on the tube side, 20% on the shell side