cranes and derricks april 3 Flashcards
What are the most frequently cited citations?
550(a)(15)(i) Clearances between power lines & equipment (29)
550(a)(9) Swing radius at rear of crane barricaded (25)
550(a)(6) Hoisting machinery – annual inspection (21)
550(b)(2) Cranes must be in compliance with ANSI B30.5 – 1968 (18)
550(a)(1) Manufacturer’s specifications (16)
common crane failures
1.Side loading the boom 2.Crane out of level 3.Impact loading the boom 4.Recoil
Clearances between power lines & equipment (29)
550(a)(15)(i)
Swing radius at rear of crane barricaded (25)
550(a)(9)
Hoisting machinery – annual inspection (21)
550(a)(6)
Cranes must be in compliance with ANSI B30.5 – 1968 (18)
550(b)(2)
Manufacturer’s specifications (16)
550(a)(1)
According to The Crane Fatality Study; The Center To Protect Worker Rights, how many crane fatalities are there?
502 fatalities
What are the crane fatalities according to the center to protect workers rights?
198 Power line contact 58 Boom assembly / dismantling 41 Boom buckling 37 Upset / overturn 36 Rigging Failure 22 Overloading 22 Struck by moving load 21 Related to man baskets 17 Working within swing radius 11 Two-blocking 7 Hoist limitation
power line contact
198
boom assembly/dismantling
58
boom buckling
41
upset/overturn
37
rigging failure
36
overloading
22
struck by moving load
22
related to man baskets
21
working with swing radius
17
Two-blocking
11
hoist limitation
7
power-line contact
39%
Boom assembly/dismantling
12%
Boom buckling
8%
upset / overturn
7%
rigging failure
7%
overloading
4%
struck by moving load
4%
What are the six crane errors due to operator error.
- Inexperienced, violent control movements
- Boomed out beyond safe working radius
- Overload
- Overturned while traveling 5.Out of level
- Boom collapsed backwards
Operator error accounts for what percent of crane accidents?
33.1%
What are the crane accidents associated with support failure.
- Ground gave way beneath blocking
- Soft footing with crawler cranes
- Outrigger blocks fail
What percent of crane failures are associated with support failure?
31.5%
What percent of crane failures are associated with failure to use outriggers?
22.6%
What percent of crane failures are due to MACHINERY & STRUCTURAL FAILURE?
11.2%
What are the crane accidents associated with MACHINERY & STRUCTURAL FAILURE?
- Boom hoist failure
- Brake failure
- Booms
- Outriggers
Crane accidents associated with high winds are what percent?
1.6%
What is the accident associated with high winds and cranes?
Wind force sufficient to topple the boom or crane
What is the total percent of accidents that are associated with the operator for crane use?
- OPERATOR ERROR 33.1% 2. SUPPORT FAILURE 31.5%
- NO OUTRIGGERS 22.6%
=87.2
operator training requirements
- Be required to pass a practical operating examination on the specific type of equipment to be operated
- Pass a written examination
- Demonstrate ability to read, write, comprehend arithmetic skills and load capacity chart usage…..
- Demonstrate understanding of ANSI B30.5 and Federal, State, & local requirements
What does NCCCO stand for?
National Commission for the Certification of Crane Operators (NCCCO)
OSHA recognizes ___ as independent verification of meeting training requirements
CCO certification
Cranes built before the ___ were built more massively than today’s cranes
1970’s
Operators used to operate by “the seat of the pants” by allowing the rear of the crane to _____.
lift off the ground
Today’s cranes will likely ____ before they will tip (this could occur on a later lift and at loads below the actual load ratings)
fail structurally
Spooling of cable on drum should be ____.
smooth and even
a. Crane operations must comply with manufacturer’s ____.
specifications and limitations
b. Where manufacturer specs not available, limitations must be based on determinations by an ________.
engineer qualified in the field of cranes.
c. No modifications allowed without written approval of ____.
manufacturer
d. ______, recommended operating speeds & special hazard warnings must be conspicuously posted on all equipment.
Rated load capacities
f. Accessible areas within the swing radius of the rotating superstructure must be ____ to prevent an employee from being struck or crushed.
barricaded
g. Hand signals prescribed by ___ must be used.
ANSI
Illustration of ____ must be posted at job site.
hand signals
i. All operator cab windows must be of ___ and be free of distortion or obstructions.
safety glass
All crane cabs must have an _______or greater.
in-service 5BC fire extinguisher
k. All employees must stay clear of all loads being _______.
hoisted or suspended
- General protocol for cranes and derricks.
a. Daily inspection by a competent person (operator) prior to use
b. b. Monthly inspection by a competent person (more mechanically oriented)
c. Annual inspection by qualified person or third party
d. All must be written and kept on jobsite
- Wire rope must meet ANSI safety factors:
a. In running ropes, 6 broken wires in 1 lay or 3 broken wires in 1 strand of 1 lay.
b. Wear of 1/3 of the original diameter of outside individual wires.
c. Evidence of any heat damage.
d. Kinking, crushing, bird caging or other distortion of the rope.
e. In standing ropes, more than 2 broken wires in 1 lay beyond end connections or more than 1 broken wire in end connections.
f. Three or more broken wires in one lay in standing ropes
