Final answer:
ASME B16.15-2013 standard covers classes which refer to pressure-temperature ratings for Cast Copper Alloy Threaded Fittings, including Class 125 and Class 250.
Step-by-step explanation:
The student is asking about the ASME B16.15-2013 standard, which pertains to Cast Copper Alloy Threaded Fittings. This standard covers classes including Class 125 and Class 250. These classes refer to the pressure-temperature ratings for the fittings, indicating the maximum pressure at which the fitting can be used at a certain temperature. ASME B16.15-2013 standard covers classes which refer to pressure-temperature ratings for Cast Copper Alloy Threaded Fittings, including Class 125 and Class 250.