MSHA - Code of Federal Regulations - 30 CFR 56.7807
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MSHA - Title 30 CFR
30 CFR § 56.7807
Flushing the combustion chamber.

The combustion chamber of a jet drill stem which has been sitting unoperated in a drill hole shall be flushed with a suitable solvent after the stem is pulled up.

Subpart G--[Reserved]

Subpart H--Loading, Hauling, and Dumping

SOURCE: 53 FR 32520, Aug. 25, 1988, unless otherwise noted.