What is the difference between lattice boom and telescopic boom?
In contrast to lattice booms, telescopic booms are typically hydraulic. They are hinged at the bottom where the arm meets with the body of the crane. The boom is then lifted when the crane operator pulls a switch telling the arm to raise or lower. The hydraulic system, or cables, does all the work.
Can lattice sections be added or removed on a truck mounted boom crane?
Lattice sections cannot be added or removed on truck boom cranes.
Can you walk under a crane boom?
The rule is simple: “Don’t stand, walk, or work under crane booms, buckets or suspended loads.” Prior planning of crane operations usually takes into account the area to be covered by the swing of the boom. Employees should stay clear when the crane operator is landing the bucket and during the take-away.
Is a crane boom considered a suspended load?
What Is a Suspended Load? Loads may be suspended by forklifts; wheel loaders, and overhead, boom, and jib cranes. Essentially, anything that is lifted above ground is considered a suspended load.
How do you prevent employees from entering the fall zone of a suspended load?
Staying Outside to Fall Zone
Under what conditions is it safe to stand on a suspended load?
When a suspended load is not moving it is only permissible to have an employee in the fall zone if they are ” hooking, unhooking or guiding the load, doing the initial attaching of the load to a component or structure or operating a concrete bucket.
Section 1926.550(a)(19) requires that “all employees shall be kept clear of loads about to be lifted and of suspended loads.” As far as we are aware, by the nature of the christmas treeing process, exposure to the suspended load is unavoidable.
Do not work under a suspended load?
A suspended load is an object that is temporarily lifted and hangs above the ground. Working or walking immediately under / close to a suspended load is unsafe as the load can fall on you. Walking under a tower crane, which collapsed (2010). Six persons died.
How should a person on the ground control a suspended load being moved?
Cards
Which crane type typically has the highest combined capacity for reach and weight?
tower cranes
What is the minimum distance allowed between a spoils pile and trenches edge?
Keep excavated soil (spoils) and other materials at least 2 feet (0.6 meters) from trench edges. Know where underground utilities are located before digging. Test for atmospheric hazards such as low oxygen, hazardous fumes and toxic gases when > 4 feet deep. Inspect trenches at the start of each shift.
How many degrees can a crawler crane operate?
4 degrees
How much can a crawler crane lift?
Crawler cranes are cranes mounted on an undercarriage with a set of tracks, or crawlers, that provide stability and mobility. Sterett crawler cranes range in lifting capacity up to 660 tons. Crawler cranes make short work of the toughest jobs.
What is the most common cause of crane related fatalities?
The most common cause of fatalities is workers or bystanders who are struck by an object that falls from the cranes. Other causes include being run over by a crane, falling from a crane, and electrocution.
Where is the best location for leveling a crane?
42 Cards in this Set
WHEN ADDING SECTIONS TO THE ASSEMBLED BOOM, ALWAYS MAKE UPPER PIN CONNECTIONS FIRST, THEN TIGHTEN BOOM SUSPENSION LINES ONLY AS FAR AS NECESSARY TO INSTALL THE LOWER PINS. (Section I-A, Items 1-12). The boom can be raised to working height when all safety precautions have been observed.
Whose job is it to inspect cranes at the jobsite?
Explanation of OSHA Regulations Concerning Crane Safety: Subsection 1926.550(a)(5) requires the employer to designate a competent person to inspect all crane machinery and equipment before and during use to ensure its safe operation.
What is the device called that automatically stops the boom when it nears the cranes maximum angle?
boom hoist kick-out
What is it called when a load block or overhaul ball makes contact with the boom or jib tip?
Two blocking means a condition in which a component that is uppermost on the hoist line such as the load block, hook block, overhaul ball, or similar component, comes in contact with the boom tip, fixed upper block or similar component.
What must the crane operator do if a load is 90% or more of the maximum line pull is to be lifted?
On wheel-mounted equipment, no loads must be lifted over the front area, except as permitted by the manufacturer. The operator must test the brakes each time a load that is 90% or more of the maximum line pull is handled by lifting the load a few inches and applying the brakes.
When it is difficult for an operator to determine?
When it is difficult for an operator to determine power line clearance by visual means, an observer is not necessary.
Do not hoist employees if weather conditions are bad?
Dangerous Conditions for hoisting and employee: Do not hoist employees if weather conditions are bad, or if any other indication of impending danger exists. If employees are hoisted and a dangerous situation arises, they should be grounded immediately and safely.
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