How should leak prevention be specified for commercial heating elements?

Specify leak prevention for commercial heating elements by matching gasket material and cross-section to the medium, temperature and pressure, then verifying flange flatness, bolt spacing, insertion depth and thread or flange type against the equipment port. Tighten bolts diagonally in stages to the gasket maker's torque; never rely on over-torquing. For units cleaned often, keep spare gaskets from the same batch, and after reassembly pressure-test at 1.5 times working pressure, logging leak points and re-tightening torque as the sealing baseline.