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Wellhead and christmas-tree valves qualify under API 6A. Pipeline and gathering-line valves qualify under API 6D. The boundary is a physical interface, and procurement gets it wrong often enough that it shows up on returns.
Flange torque comes from bolt material, gasket preload, and lubricant friction — not a chart lookup. Here's the ASME PCC-1 methodology with the inputs and the math.
Wellhead and christmas-tree valves qualify under API 6A. Pipeline and gathering-line valves qualify under API 6D. The boundary is a physical interface, and procurement gets it wrong often enough that it shows up on returns.