MSHA - Code of Federal Regulations - 30 CFR 56.16002
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MSHA - Title 30 CFR
30 CFR § 56.16002
Bins, hoppers, silos, tanks, and surge piles.
(a) Bins, hoppers, silos, tanks, and surge piles, where loose unconsolidated materials are stored, handled or transferred shall be--
(a) (1) Equipped with mechanical devices or other effective means of handling materials so that during normal operations persons are not required to enter or work where they are exposed to entrapment by the caving or sliding of materials; and
(a) (2) Equipped with supply and discharge operating controls. The controls shall be located so that spills or overruns will not endanger persons.
(b) Where persons are required to move around or over any facility listed in this standard, suitable walkways or passageways shall be provided.
(c) Where persons are required to enter any facility listed in this standard for maintenance or inspection purposes, ladders, platforms, or staging shall be provided. No person shall enter the facility until the supply and discharge of materials have ceased and the supply and discharge equipment is locked out. Persons entering the facility shall wear a safety belt or harness equipped with a lifeline suitably fastened. A second person, similarly equipped, shall be stationed near where the lifeline is fastened and shall constantly adjust it or keep it tight as needed, with minimum slack.