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U.S. Department of Labor
Occupational Safety & Health Administration
[C]overs shall be capable of supporting without failure, at least twice the weight of employees, equipment, and materials that may be imposed on the cover at any one time.
The engineering report provided with your letter states that the test unit used in that report has a failure pressure of 1,300 pounds when the cover is mounted over a 12-inch cylindrical opening and a failure pressure of 2,900 pounds when mounted over a 6-inch cylindrical opening. If the cover were to be used over a 12-inch cylindrical opening, the total weight that would potentially be imposed on the cover must be 650 pounds or less to fall within this requirement. If the cover were used over a 6-inch cylindrical opening, the total weight must be 1,450 pounds or less. Given these results, it seems likely that the cover would fulfill the strength requirements in §1926.502(i)(2) in most situations.
All covers shall be secured when installed so as to prevent accidental displacement by the wind, equipment, or employees.