How should hot-state disassembly be specified for commercial heating elements?

Hot-state disassembly conditions for commercial heating elements should be set from the actual duty: record medium temperature, thermal cycle count and heating/cooling rate, flange and gasket material and thickness, sheath diameter, surface load, and protection class, then define the maximum permitted disassembly temperature, cooling method, and stabilization time. The supplier should provide sealing-face dimensional change between cold and hot states, gasket recovery, re-torque range, and allowable element position deviation after refitting. At acceptance, verify insulation resistance, leakage current, seal tightness after reassembly, and heated-zone position; reject any unit exceeding the agreed deviation.