Page 54 - Safety and health in construction
P. 54
Safety and health in construction
7.10.14. Air receivers should be examined and tested at appropriate intervals by a
competent person.
7.10.15. The safe working pressure should be marked in a distinctive colour on
the pressure gauge.
7.10.16. Where necessary to prevent danger, a pressure-reducing valve or a stop
valve, or both, should be inserted in the piping between the air receiver and the
compressor.
7.10.17. Between the receiver and each consuming appliance there should be a
stop valve.
7.10.18. Cylinders for compressed, dissolved or liquefied gases should be
properly constructed with sound material, fitted with appropriate safety devices in
accordance with national laws or regulations, inspected and tested by a competent
person as prescribed and stored, transported, handled and used in conformity with the
prescribed safety measures.
7.11. Conveyors
7.11.1. Conveyors should be so constructed and installed as to avoid hazardous
points between moving and stationary parts or objects.
7.11.2. When conveyors that are not entirely enclosed cross over places where
workers are employed or pass beneath, sheet or screen guards should be provided to
catch any falling material. Adequate fencing should be provided at transfer points.
Emergency stopping devices should be fitted at convenient locations easily accessible
for workers.
7.11.3. Power-driven conveyors should be provided at loading and unloading
stations, at drive and take-up ends, and at other convenient places, if necessary to
prevent danger, with devices for stopping the conveyor machinery in an emergency.
7.11.4. Where two or more conveyors are operated together, the controlling
devices should be so arranged that no conveyor can feed on to a stopped conveyor.
7.11.5. Screw conveyors should be enclosed at all times. The cover should not be
removed until the conveyor is stopped.
7.11.6. When a conveyor is discharging into a bunker or hopper, the feeding
conveyor should be equipped with an overload switch.
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