StacksVerified U.S. regulatory reference

29 CFR §1919.73

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Unit proof tests of derricks shall be carried out at the same times as are specified in § 1919.71(a) for cranes.
  2. (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:
  3. (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.