Lifting appliances

Pages:63-89
5. Lifting appliances
5.1. General provisions
Maximum safe working load
5.1.1. Adequate steps should be taken to ascertain the maximum
safe working load or loads of every lifting appliance.
5.1.2. The maximum safe working load should be marked:
upon every winch and pulley block used in the hoisting or
lowering of any load;
upon every derrick pole or mast; and
upon every crane.
5.1.3. In the case of a crane fitted with a derricking jib, the safe
working load at various radii of the jib should be marked upon it,
or otherwise clearly indicated.
5.1.4. The maximum safe working load or loads should be
incised or stamped in a legible and durable manner, or marked at
a conspicuous place in some other legible and durable manner.
Installation
5.1.5. Fixed lifting appliances should be installed:
by competent persons;
so that they cannot be displaced by the load, vibration or
other influences;
so that the operator is not exposed to danger from loads, ropes
or drums; and
so that the operator can either see over the zone of operations
or communicate with all loading and unloading points by tele-
phone, signals or other adequate means.
5.1.6. Adequate clearance should be provided between moving
parts and loads of lifting appliances and:
lixed objects such as walls and posts; and
electrical conductors.
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Safety and health in building and civil engineering
5.1.7. Every lifting appliance should be adequately supported.
5.1.8. When lifting appliances are exposed to wind loadings,
they should be given sufficient additional strength, stability and
rigidity to withstand such loadings safely.
5.1.9. No structural alterations or repairs should be made on
any part of a lifting appliance that affects the safety of the appliance
without the permission of the competent person.
Operator's cab or cabin
5.1.10. The operator of every lifting appliance in outdoor
service should be provided with a cab or cabin which should:
be made of fire-resisting material;
have a suitable seat and a foot rest including protection
from vibration;
afford the operator an adequate view of the area of operation;
afford the necessary access to working parts in the cab;
afford the operator adequate protection against the weather;
be adequately ventilated;
be adequately heated in cold weather;
(Ii) be free from the risk of the operator coming into contact with
the heating appliance when operating the controls;
(1) be provided with a suitable fire extinguisher.
Controls
5.1.11. Controls of lifting appliances should be:
so situated that the operator at his stand or seat has ample
room for operation and an unrestricted view, and remains
clear of the load and ropes, and that no load passes over him;
provided, where necessary, with a suitable locking device to
prevent accidental movement or displacement.
5.1.12. Control handles should, as far as possible, move in
the direction of the resultant load movement, or clockwise for
lifting and anti-clockwise for lowering.
5.1.13. The stroke of hand levers should not exceed 60 cm (2 ft).
5.1.14. The stroke of pedals should not exceed 15 cm (6 in).
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