single-point adjustable suspension scaffolds.
- When two single-point adjustable suspension scaffolds are combined to form a two-point adjustable suspension scaffold
- the resulting two-point scaffold shall comply with the requirements for two-point adjustable suspension scaffolds
- The supporting rope between the scaffold and the suspension device shall be kept vertical unless all of the following conditions are met;
- The rigging has been designed by a qualified person, and
- The scaffold is accessible to rescuers, and
- The supporting rope is protected to ensure that it will not chafe at any point where a change in direction occurs, and
- The scaffold is positioned so that swinging cannot bring the scaffold into contact with another surface.
- Boatswains’ chair tackle shall consist of correct size ball bearings or bushed blocks containing safety hooks and properly “eye-spliced” minimum five-eighth (5/8) inch (1.6 cm) diameter first-grade manila rope, or other rope which will satisfy the criteria (e.g., strength and durability) of manila rope.
- Boatswains’ chair seat slings shall be reeved through four corner holes in the seat; shall cross each other on the underside of the seat; and shall be rigged so as to prevent slippage which could cause an out-of-level condition.
- Boatswains’ chair seat slings shall be a minimum of five-eight (5/8) inch (1.6 cm) diameter fiber, synthetic, or other rope which will satisfy the criteria (e.g., strength, slip resistance, durability, etc.) of first grade manila rope.
- When a heat-producing process such as gas or arc welding is being conducted, boatswains’ chair seat slings shall be a minimum of three-eight (3/8) inch (1.0 cm) wire rope.
- Non-cross-laminated wood boatswains’ chairs shall be reinforced on their underside by cleats securely fastened to prevent the board from splitting.
- The supporting rope between the scaffold and the suspension device must be kept vertical unless:
- The rigging has been designed by a qualified person.
- The scaffold is accessible to rescuers.
- The support rope is protected from rubbing during direction changes.
- The scaffold is positioned so swinging cannot bring it into contact with other surfaces.
- When combining two single-point scaffolds to form a two-point suspension system, the resulting scaffold must comply with requirements.