Cranes, Derricks, Hoists, Elevators, and Conveyors-Subpart N Section 6
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- Cranes and Derricks
- 1926.550
- Helicopters -
1926.551
- Material Hoists,
Personnel Hoists, and Elevators - 1926.552
- Base-Mounted Drum
Hoists - 1926.553
- Overhead Hoists
- 1926.554
- Conveyors - 1926.555
........and a few other pieces of equipment
Cranes and Derricks - 1926.550
- General Requirements
- Follow manufacturer’s
specs and limits
- Capacities,
speeds, warnings, instructions posted in view of operator
- ANSI standard
hand signals posted at site
- Annual inspection
documented
Improper Footing
Wire ropes must be inspected prior to use each day.
(Synthetic webbing slings must be inspected according to its specific standard
1926.251(e).)
Wire Rope Removed From Use When:
- 6 broken wires
in 1 lay, 3 in 1 strand
- for example
3/4 inch, 6 x 19 IWRC is one lay or six inches.
- Outer wires worn
1/3 original diameter
- Birdcaged, crushed,
kinked
- Heat damaged
- Reductions from
nominal diameter
Sheave grooves may
become grooved if cable's nominal diameter is reduced, indicating wear.
Cranes and Derricks - 1926.550
- Belts, gears,
shafts, pulleys, etc. guarded
- Swing radius barricaded
- Exhaust pipes
guarded or insulated
- Exhaust in enclosed
spaces - air monitoring
General Requirements
- Windows in cabs
- no distortion
- Ladder or
steps to cab roof
- Guardrails,
handholds, steps to cab
- Anti-skid
walking surfaces
- Fire extinguisher
of 5BC rating
Crane Electrical
Hazards
- If operator has
no clear view, spotter needed
- Work near transmitter
towers may require grounding cables
At LEAST 10 ft. from wires
Cranes and Derricks - 1926.550
- General Requirements
- NO modifications
or additions without manufacturer’s written approval.
- All employees
clear of suspended loads at all times.
Mark's first crane
Crawlers and Locomotives
- Compliance with
ANSI B30.5-1968
- Record of inspections
on file
- Jibs have positive
stops to prevent overbooming of more than 5 degrees above the straight
line of the jib
Tower Cranes
Slewing unit of tower crane
Hammerhead Tower Cranes - 1926.550
- Employees tied
off on horizontal booms
- Buffers at
each end of trolley
- Limit switches
in place
- Manufacturer’s
recommendations
- Adequate clearances
maintained
Personnel baskets (Personnel platforms)
- Rule #1- May
only be used when there is NO OTHER safe means of performing the work!
Personnel baskets are the tool of last resort.
Personnel basket
crane specs
Brakes set, level
within 1% of grade
Derate machine capacity 50%
Load line safety factor 7-10 times
No live boom machines
Telescoping boom length indicator
No free fall- power up & power down
Positive anti-two
block device
Anemometer
Cranes and Derricks - 1926.550
- Suspended Personnel
Platforms Design
- Support 5
times intended load
- Guardrail,
enclosed from midrail to toeboard, grab rail installed inside
- Hard hats
and overhead protection
- Welding by
qualified welder
- Weight of
platform and rated capacity marked
Suspended Personnel
Platforms - 1926.550
- Master link or
shackle for bridle legs
- Eyes fabricated
with thimbles
- Rigging used only
for personnel basket
- Basket landed
or secured before entry
- Employees tied
off to basket
Helicopters
Helicopters - 1926.551
- Federal Aviation
Administration regulations
- Briefing (includes
emergency drop zone)
- Slings and tag
lines, cargo hooks
- Personnel Protective
Equipment
- Hooking and unhooking
(static electricity)
- Signal systems,
visibility, & communication
- Approach distance
and approaching
- Fires
Air crane at McKee Foods
- General Requirements
- Manufacturer’s
specifications and limitations
- Capacities,
speeds, hazard warnings posted
- Removal of
damaged wire rope
Material Hoists
- Operating rules
established and posted at operator station - No riders
- Entrances to hoistways
protected
- Overhead protection
- cages, platforms, operator stations
- Hoist tower enclosures
- Car arresting
devices in case of rope failure
- Designed by professional
engineer
Personnel Hoists and Elevators - 1926.552
- Tower anchored
to structure every 25 ft.
- Cars permanently
enclosed on all sides except entrance
- Doors or 78”-high
gates at each level
- Electric safety
contacts on doors/gates
- Capacity and data
posted
- Emergency stop
switch inside car
- Inspection and
testing before use and every 3 months
The Most Frequent
Citations:
- Failure to guard
swing radius
- Operating near
power lines
- No load chart
- Unnecessary use
of personnel basket
This lift should have
been stopped before it got this far
What Questions Do You Have On Cranes, Derricks, Hoists, and Conveyors?
- Now I have a few
questions
- Please turn to
the Crane Test page in your handout material
Crane, Derricks,
Hoists
- The CLOSEST crane
approach to live power
line?
- Suspended personnel
platforms may ONLY
be used when?
- Are broken wires
allowed?
- The size extinguisher
for a crane?
Answers
- No CLOSER than
10 feet
- When there’s
no other safe way to work
- No more than
6 in 1 lay, 3 in 1 strand
- 5 BC Extinguisher
(minimum)
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