What are Category 3 cranes?
Category 3 cranes are those with a certified capacity of less than 20,000 lbs.
Why should the hook be positioned directly over the load when attaching the load?
When rigging and lifting a load, it is important the hook is correctly positioned where the weight of the object listed is applied in the bowl or saddle of the hook. Side, back and or tip loading are conditions that reduce the hook’s lifting capacity and can cause damage to the hook (see illustration below).
Why is it important to have bent or dented crane boom members inspected and evaluated?
It is important to have bent or dented crane boom members inspected and evaluated because they can greatly reduce the strength of a boom, possibly resulting in sudden collapse of the boom. Gantry, Pendants, and Boom Stops Check the condition of the gantry, pendants, and boom stops.
What markings are required on lashing?
Lashing Lashing must be marked to identify it to the spool or reel from which it came. The rated load must be marked on each piece as well as the re- inspection due date.
What are the 5 principal parts of Category 1 and Category 4 cranes?
Category 1 and 4 Crane Components The principal parts of most Category 1 and 4 cranes are: the boom, machinery house, roller path or rotate bearing, supporting structure, and travel system.
What is the anti two block?
Anti two-block or ATB systems help prevent the ball block from contacting the boom tip. This is called two-blocking and can cause injury or death as well as damage to the crane, load line and ball or block. The Altec ATB system consists of a load line weight suspended from a chain, connected to a boom tip ATB switch.
What are the types of rigging?
Different Types of Rigging Equipment
- Rigging Hooks. Rigging hooks are used when heavy equipment needs to be lifted.
- Pulleys and Blocks. Pulleys and lifting blocks are used when very heavy objects need to be lifted.
- Shackles.
- Eye Bolts.
- Steel Nuts.
- Wire Ropes and Accessories.
- Synthetic Lifting Slings.
What is crane rigging?
Crane rigging refers to the process that you’ll need to go through in order to prepare your crane equipment for a lift and then execute your lift according to plan. Let’s take a closer look at some of the steps that will be involved when you utilize crane rigging services as part of your next construction project.
Which two cranes use a lattice boom?
There are three types of lattice boom cranes.
- The crawler crane has the advantage of moving with loads for a short distance. Its maximum capacity is 1.600T.
- The outrigger crane consists of the pedestal crane and the truck crane.
- The third type is the ring crane.
Which of the following are the four major causes of crane accidents?
The main four causes of crane accidents are contact with power lines, overturns, falls, and mechanical failure.
What must be stamped on each hoist?
Rated load marking. The rated load of the crane shall be plainly marked on each side of the crane, and if the crane has more than one hoisting unit, each hoist shall have its rated load marked on it or its load block and this marking shall be clearly legible from the ground or floor. Clearance from obstruction.
Why are carabiners not for lifting?
Strength loss is most pronounced with a pear-shaped carabiner, as the nose is rather far from the spine side of the frame. Their shape also contributes to poor positioning of the load.