Can anyone define what is a pressure containing and what is a Non pressure containing part. Per API 6A 3.1.72 Pressure containing part is a part whose failure to function as intended result in a release of retained fluid to the atmosphere. But does not mention anything about Non pressure containing. Please suggest.what type of valve are you asking about? Also do you want the definition as it indicated in the ASME boiler code or some other standard?for example the pressure containing parts per ASME SECTION III for a bolted bonnet wedge gate valve would be Body, bonnet, wedge, and body-bonnet bolting. The API 6A definition you have above in my mind is too vague because you could make an argument for almost every part of the valve being pressure containing using that definition.

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