cranes and derricks part 2 Flashcards
All belts, gears, pulleys, or any other moving parts must be _____ to prevent possible worker contact.
guarded
All cranes must have an _____ on hand for the crane in use.
operators manual
Minimum clearances between energized power lines and crane operations:
- No closer than 10 feet - up to 50 kV
2. Over 50 kV – 10 feet plus 0.4 inches for each 1kV over 50 kv
Where cranes must operate in proximity to energized power lines, What to things must be done?
- Lines must be deenergized and visibly grounded at the point of work
- Insulating barriers must be erected to prevent physical contact with the lines
An observer must be designated if it is difficult for operator to determine ____ clearances by visual means
power line
All overhead wires must be considered _____ unless line owner or utility indicates it is not and it has been visibly grounded.
energized
Should the crane contact power lines, the operator must _______ if it is at all safe to do so.
stay in the crane
If the operator MUST leave the cab due to imminent danger, they must jump free and clear, without _____.
touching the crane
If in contact with a high voltage power line, the power companies recommend the operator ____ the feet as they move away from the crane
hops or shuffles
Two rules for hammerhead tower cranes
- Employees required to work on the horizontal boom (load jib) must be protected from falls by guardrails or personal fall arrest equipment
- Buffers must be provided at both ends of the travel of the trolley
Overhead & Gantry Cranes five rules to follow
- An audible alarm system must be provided for each traveling mechanism
- Does not apply to floor operated units
- Rail sweeps must be provided
- Rated load capacities must be plainly marked on each side of crane
- If more than one hoisting unit, each load block must be marked with rated load and be visible from ground or floor
Crane Suspended Personnel Platforms use is prohibited unless.
- Conventional means of reaching work site would be more hazardous – or
- Not possible because of structural design or work site conditions
- If used, must be designed by a qualified engineer or qualified person competent in structural design
In Crane Suspended Personnel Platforms hoist drum must have ____________. Free fall is prohibited.
controlled load lowering system
Platform for Crane Suspended Personnel platforms must be equipped with:
- Guardrail system (per subpart M)
- Grab rail inside perimeter of platform
- Plate or marking indicating weight of platform and rated load capacity
When working with crane suspended personnel platforms, hoisting of _____ must be performed in a slow, controlled manner.
Personnel
When working with Suspended Personnel platforms, cranes must be equipped with _______ or system which deactivates hoisting action.
anti-two blocking device
When working with suspended personnel platforms, safety latch on hook must be able to positively close & lock the _______.
throat opening
When dealing with Crane Suspended Personnel Platforms, a trial lift must be completed as follows:
- Unoccupied platform loaded to anticipated lift weight
- Perform immediately before placing personnel in platform
- Repeat whenever crane is moved to new location or returned to a previous location
When dealing with Crane Suspended Personnel Platforms, a pre-lift meeting must be attended by the
- crane operator
- signal person
- person responsible for task to be performed
When dealing with Crane Suspended Personnel Platforms, a meeting to review OSHA requirements regarding platform use ______.
Must be held at each new work location.
Why do cranes overturn?
Improper set up
What are the two categories in Ground/Crane Condition that cause crane overturn? This accident makes up for what percent of crane overturn?
1.Ground unstable
2.Crane and/or ground not level
This accounts for 31%
What are the two categories in Outrigger Deployment that cause crane overturn? What percent of crane overturn is caused y this accident.
- Outriggers improperly deployed
- Inadequate blocking/cribbing
This accounts for 22%
What are the two most common factors that cause Overloading? What percent of accidents are caused by overloading?
- Load weight greater than thought
- Load chart/computer ignored or misinterpreted
16% of accidents are caused by this.
What are the two most common factors that cause Operator Error? What percent of accidents are caused by this?
- Inexperience/unfamiliarity with equipment
- Dynamic loading(sudden starts/stops)
31% of accidents are caused by this.
Helicopter operations four rules
- Must comply with FAA regulations
- Must have pre-lift briefing daily
- Cargo hook must have emergency release
mechanism - Constant communication between pilot &
ground signalman
maintained in manner
predetermined
Material Hoists, Personnel
Hoists, and Elevators four rules to follow.
- Maximum operating loads & speeds must
be posted - All operations must follow manufacturer’s
specifications - Entrances to hoist ways must be guarded
- Secondary arresting device required on all
hoists & elevators
Personnel hoist. The only
person who should be able
to open the door to each
floor is the ____.
hoist operator
Poor set up. Employees should never be allowed to \_\_\_\_\_\_ to catch a ride on the hoist due to the fall hazard. Doorways must be arranged so that only the hoist operator can open the door to the building.
walk outside the building
Base-Mounted Drum Hoists three rules to follow.
1. Design, construction, inspection, operation & maintenance must meet manufacturer requirements 2. All controls must be within easy reach of operator 3. All exposed moving parts must be guarded
Four rules for conveyors.
- Must meet ANSI B20.1-1957
- Must have shutoff device at operator station &
start-up alarm - All moving parts must have contact guards
- Lockout/tagout required during maintenance
or repairs or during any hazardous operations
Conveyors must meet ___.
B20.1-1957
All conveyors must have ___ at operator station &
start-up alarm
shutoff device
When dealing with conveyors moving parts must have ____.
contact guards
When dealing with conveyors ____ required during maintenance
or repairs or during any hazardous operations
Lockout/tagout
How often must a crane must be inspected
by the competent person?
Daily
How many broken wires are allowed within
one lay of running ropes?
6 wires
What device is required on cranes that
hoist personnel?
Anti Two Blocking Device
How far must crane operations be from
power lines at 50 KV?
10 feet
