Final answer:
The casting quality factor, Ec, for A216 carbon steel that is not upgraded as specified in ASME B31.3 is typically 0.80, used in pressure design calculations to account for variability in casting quality.
Step-by-step explanation:
The casting quality factor, Ec, for a A216 carbon steel casting that is not upgraded per B31.3 paragraph 302.3.3(c) and table 302.3.3C can be found in the ASME B31.3 Process Piping Code. According to the standard, the casting quality factor for castings that are not upgraded is typically set to a default value of 0.80 for pressure design calculations, unless a higher value is proven with appropriate quality inspection or testing per the code's requirements. It's worth mentioning that this factor accounts for the potential variability in the quality of the casting due to defects such as voids or inclusions and is used to ensure the casting has sufficient strength for its intended application under prescribed conditions.