30 CFR § 36.42
Inspection.
A detailed inspection shall be made of the equipment and all components and
features related to safety in operation. The inspection shall include:
(a) Investigating the materials, workmanship, and design to determine
their adequacy.
(b) Checking the parts and assemblies against the drawings and
specifications with respect to materials, dimensions, and locations to verify
their conformance.
(c) Inspecting and measuring joints, flanges, and other possible
flame paths in the intake and exhaust systems to determine whether they will
prevent the issuance of flame or propagation of an internal explosion.
(d) Inspecting and measuring flame arresters to determine whether
they will prevent the issuance of flame or propagation of an internal
explosion.