MSHA - Code of Federal Regulations - 30 CFR 57.6802
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MSHA - Title 30 CFR
30 CFR § 57.6802
Bulk delivery vehicles.

No welding or cutting shall be performed on a bulk delivery vehicle until the vehicle has been washed down and all explosive material has been removed. Before welding or cutting on a hollow shaft, the shaft shall be thoroughly cleaned inside and out and vented with a minimum 1/2-inch diameter opening to allow for sufficient ventilation.

[58 FR 69596, Dec. 30, 1993]