- Part Number:1919
- Part Number Title:Gear Certification
- Subpart:1919 Subpart H
- Subpart Title:Handling Cargo
- Standard Number:
- Title:Unit proof test and examination of derricks.
- GPO Source:
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. _______________________|_______________________
Proof loads shall be applied at the designed maximum and minimum boom angles or radii, or, if this is impracticable, as close to these as practicable. The angles or radii of test shall be stated in the certificate of test. Proof loads shall be swung as far as possible in both directions. The weight of all auxiliary handling devices shall be considered a part of the load.