When calculating the cylinder thickness, how should the negative material deviation C1 be selected?
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Which specification states it? The example in the specification explanation simply states that C1 should be set to 0.3, but how is this value determined?
Please refer to the standard GB713-2014
According to the standards for materials specifically designed for pressure vessels, the conventional negative deviation for carbon steel and low-alloy steel is 0.3, with this value being based on Category B deviations as specified in GB709. Of course, a Class C deviation with a negative deviation of zero can also be specified.
Just look at the GB713, GB3531, and GB19189 standards to find out.
The material standards specify this; just check the standards
The material standards specify negative deviation limits