The Safe Use of Fork Lift Trucks - NASS
Transcript of The Safe Use of Fork Lift Trucks - NASS
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The Safe Use of Fork Lift Trucks
Peter Corfield
NASS Director General
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The Law….
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Health & Safety at Work Act 1974
To ensure, as reasonable practicable,
the health & safety of yourself and others
who may be affected.
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Management of Health & Safety at Work Regulations 1999
To carry out suitable and sufficient risk assessment to protect your employees and others
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Provision and Use of Work Equipment Regulations 1998(PUWER)
• Work equipment is suitable and is maintained and inspected regularly
• Where the use of work equipment poses a risk
use is restricted to authorised personnel • Authorised personnel, managers and supervisors
require adequate training
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Lifting Operations and Lifting Equipment Regulations 1998
(LOLER)
• Properly planned by a competent person
• Appropriately supervised
• Carried out in a safe manner using suitable equipment
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Workplace (Health, Safety and Welfare) Regulations 1992
• Organisation of traffic routes
• Sufficient lighting
• Floors and traffic routes constructed suitably to not expose risk
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An Aluminium Fabricator was sentenced after a worker was fatally crushed under a lifting truck which tipped over whilst extracting aluminium metal moulds from a racked storage system.
What happened?
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What happened?
The Company was fined £140,000 and ordered to pay £32,251.31 in costs after pleading guilty to
• 2(1) Inadequate Risk Assessment
• 3(1) Inadequate System of Work
breaching the Health and Safety at Work Act 1974.
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Fork Lift Truck Operation
The Basics
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FLT Centre of Gravity
Most fork lift trucks are rear wheel drive with the weight in the base of the vehicle to reduce instability
The “centre of gravity” for a fork lift truck is pictured
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FLT Centre of Gravity
With a load on the forks this changes the weight distribution as the load also has its own centre of gravity
‘Balanced load’
Centre of Gravity
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FLT Centre of Gravity
The centres of gravity combine to create the Composite centre of gravity
‘Balanced load’
Centre of Gravity
Composite Centre of Gravity
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FLT Centre of Gravity
‘Balanced load’
Centre of Gravity
Composite Centre of Gravity
The higher the balanced load the higher the Composite centre of gravity
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This is a plan view of a fork lift truck The triangle in red shows the Stability Triangle
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The rear wheels of an FLT are articulated This means that the rear axle is connected to the chassis in the centre
Rear Axle
Chassis
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So the triangle is measured from the centre of the rear axle to the centre of the front wheel tyres
Centre of rear axle
Centre of front tyres
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If either the FLT centre of gravity or the Composite centre of gravity are outside the stability triangle the FLT is unstable.
Composite Centre of Gravity
FLT Centre of Gravity
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A forklift does not have any suspension. This means when the centre of gravity becomes higher on a stacked load - this can cause Lateral Instability
Approximately 75% of all truck turnovers are lateral
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Ensure the load is centrally positioned and the fork spacing is distributing the weight evenly
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Turning sharply at speed will make the FLT highly unstable, especially when not carrying a load
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Backward tilt at height moves the centre of gravity towards the rear of the FLT
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The thinner part of the stability triangle Meaning the centre of gravity is more likely to move out of the stability triangle when turning
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The FLT should never be turned whilst the load is elevated If this is not viable, a full risk assessment should be conducted and the FLT should only be turned very slowly and carefully.
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Floor obstructions can cause a FLT to tip over
Good house keeping
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Employers and operators should ensure that the traffic routes are in reasonable condition and free from obstructions
Floor obstructions can cause a FLT to tip over • Debris • Wrapping • Chocks • Slippery patches • Drains/ potholes • Kerbstones
Good house keeping
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Group exercise
Identify ways an employee could cause lateral instability
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Lateral Stability
• Turning at speed • Turning with mast elevated • Turning across a slope • floor obstructions • Potholes • Live loads • Offset forks • Offset side shift • Offset load • Edge of loading bay
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The tipping /pivot point/ fulcrum is the front wheel of the FLT.
Fulcrum/pivot /tipping point
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FLT Centre of Gravity
FLT’s have a specified rated capacity based on the weight of the FLT being heavier than the load
‘Balanced load’
Centre of Gravity
Composite Centre of Gravity
Fulcrum/pivot point/tipping point
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FLT Centre of Gravity
‘Balanced load’
Centre of Gravity
Composite Centre of Gravity
Fulcrum/pivot point/tipping point
The heavier the load the more it will be affected by gravity and the more it will pull the composite gravity balance
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Centre of front tyres
This pushes the gravity out of the stability triangle making it unstable
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If the load being carried is too heavy for the rated capacity of the truck it will tip forward on the front wheel.
Fulcrum/pivot point/tipping point
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“undercutting”
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FLT Centre of Gravity
The distance from the front face of the forks to the centre of gravity of the load is the load centre
‘Balanced load’
Centre of Gravity
500mm Load centre
Composite Centre of Gravity
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The FLT will become unstable if the load centre exceeds specification
Load centre
Composite Centre of Gravity
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The shape of the load also affects the load centre
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The size of the load can obscure view, in this case drive in reverse
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Forward tilt at height can cause instability Forward tilt is meant to assist the operator in withdrawing the forks from a load after the load has been stacked.
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Forklift trucks can also turnover due to excessive emergency braking The forks would likely dig in to prevent overturn unless they were raised. Progressive braking will keep stability
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The FLT should be driven forwards up the slope and in reverse when going down the slope. Travelling with the load pointing down the slope can cause the truck to overturn or the loss of a load.
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If vision is blocked by a large load, use a banks man
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Group exercise
Identify ways an employee could
make the FLT
flip forward on its tipping point
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Forward Stability
• Overloading the FLT
• Increasing the load centre
• Carrying a load that is too long
• Using forward tilt at height when laden
• Incorrect use of the truck on slopes
• Harsh braking
• Traveling with the mast extended
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This is a capacity plate The column on the right-hand side shows the normal lift height. This truck will stack to a height of 3890 mm without de-rating but the maximum stacking height is 7890 mm.
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The load centre is shown in the horizontal column at the bottom of the capacity plate. The smallest load centre, 500 mm, is the standard load centre that is used on most forklift trucks.
A huge container handler on the dockside might have a standard load centre of 1000 mm or more.
Notice how the truck's capacity reduces as the load centre increases.
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This slide shows the way the capacity plate should be read by the operator. There are two parts to ascertaining the trucks capacity.
The load centre in use (500mm) and the stacking height (3890mm)
The basic capacity of this truck therefore is 1600 kg
The greater the load centre or the higher the height, the less the truck will lift.
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recap
Identify ways an employee could make the FLT centre of gravity and
the Composite centre of gravity
fall outside the stability triangle
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Factors affecting a loaded fork lift truck
• Weight of load
• Size of load
• Shape of load
• Position of load on forks
• Height to which the load is elevated
• Amount of forward mast tilt
• Forces created when braking
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In the event of a forklift truck overturning
• under no circumstances try to jump off the machine!
• grab something firmly such as the steering wheel
• try to brace feet in the foot well of the compartment.
• lean away from the direction in which the truck is tipping.
• Under LOLER and PUWER, counterbalanced forklift trucks must mandatorily be fitted with seatbelts to be worn at all times
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What happened?
An FLT driver was moving a large metal coil with the forks in the raised position, restricting the driver's vision
The driver was unaware two other employees were in the warehouse and hit one of the workers knocking him to the ground and running over his leg,
The other worker shouted to the driver who panicked and reversed the FLT over his co-worker's leg once again
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What happened?
The Company was fined £36,000 after pleading guilty to breaching
Section 2 of the Health and Safety at Work Act.
Corrective measures were made to working procedures after this accident totalling £4, 500
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Pedestrians can be kept safe through
safer systems of work
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It is the FLT OPERATOR'S RESPONSIBILITY
to watch out for pedestrians
not the other way around
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Provide sufficient clear and unambiguous warning signs
at strategic locations
to inform people
forklift trucks operate in the area.
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Define,
designate and
clearly mark
pedestrian routes and crossing places
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Pedestrians, where possible should be segregated from vehicle routes by a physical barrier.
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use the manually operated horn in several short bursts at blind corners to attract attention
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Flashing beacons / safety lights
are effective as a warning device
Especially to other FLTS
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high visibility clothing or light coloured overalls for both operators and pedestrians
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Employees should also stand clear behind the FLT where they may not be fully visible to the driver.
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It is forbidden to carry passengers
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drive at least three truck lengths behind another FLT
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The Lifting Operations and Lifting Equipment Regulations (LOLER) 1998
PROHIBIT planned maintenance operations
to be carried out by an FLT
“Cherry picker”
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• Painting
• Cleaning
• Maintenance
• Stocktaking
• Order Picking
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The heel of the forks should be 10 to 15 cm above the floor with the forks tilted back on an unladen FLT to prevent •digging into obstructions •hitting a pedestrians ankle on a laden FLT to create •stability
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Ensure the forks are lowered and tilted forward when parked Parking brake on Turned off with the key taken out to prevent unauthorised personnel from using the FLT
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