USCG Exam PracticeCargo gear and rigging
The SWL of an assembled yard-and-stay (burton) rig compared to the SWL of either boom used alone in a single swinging rig is:
- A. Equal, because the same runners and blocks are used in both configurations
- B. Higher, because two winches share the load and reduce stress on each boom
- ✓ Lower, because the combined pull on the married falls when the load is midway between the booms can be very highCorrect
- D. Lower only when the union guy is not rigged between the two boom heads
Why C is correct
NAVEDTRA 14343 §9-3 states that the SWL of the yard-and-stay rig is lower than the SWL of a single boom used alone because the combined tension on the married falls when the load is midway between the booms can be very high, placing heavy loads on the union guy and associated fittings.
Cited:NAVEDTRA 14343 §9-3