29 CFR 1919.73 – Unit proof test and examination of derricks
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(a) Unit proof tests of derricks shall be carried out at the same times as are specified in § 1919.71(a) for cranes.
(b) Unit proof load tests and safe working load ratings shall be based on the design load ratings at the ranges of boom angles or operating radii. Unit proof loads shall exceed the safe working load as follows:
| Safe working load | Proof Load |
|---|---|
| Up to 20 tons | 25 percent in excess. |
| 20-50 tons | 5 tons in excess. |
| Over 50 tons | 10 percent in excess. |
(c) After satisfactory completion of a unit proof load test, the derrick and all component parts thereof shall be carefully examined in accordance with the requirements of § 1919.71(d), as far as applicable.