![]() ![]() ![]() (1) Employees shall work at least two rafters apart, be provided with and use an approved safety harness with safety line securely attached to safe supports (c) When tank or reservoir roof plates or sheathing are suspected to be weak or defective and it is necessary for employees to go onto a roof to determine the extent of the weak and defective parts or to remove them, the following precautions or equally safe procedures shall be used This order shall not prohibit an employee, when protected by approved respiratory equipment, from entering such a hazardous atmosphere when necessary, provided that the work is not of a nature that tends to aggravate the hazard. When there is reason to suspect the existence of any of the hazards above mentioned, jobsite atmospheric tests shall be made and employees shall be protected. (b) Work shall not be performed upon the exterior of the roof or shell of a tank at a location where the employee may be exposed to a hazardous concentration of flammable or toxic gases or vapors. These signs shall read: "DANGER - UNSAFE ROOF - KEEP OFF", or equivalent wording in letters at least two inches (2") in height. Legible signs shall be posted at all approaches to the tank or reservoir roof if the entire roof is blocked off, or on the barrier facing all approaches to the defective area if only a portion of the tank or reservoir roof is barricaded. Where a roof has been found to be unsafe or has not been inspected, substantial barriers shall be erected to block off the entire roof or that portion which is unsafe. (a) The roofs of tanks and reservoirs in service shall be externally inspected by a qualified person at intervals not to exceed one year. Petroleum Safety Orders-Refining, Transportation and Handling ![]()
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