Page 53 - Safety and health in construction

Plant, machinery, equipment and hand tools

7.10.3. Only persons tested and certified by the competent authorities should
operate steam boilers.

7.10.4. Compressors should be equipped with:
(a) automatic devices that will prevent the maximum safe discharge pressure from
being exceeded;
(b) a quick-release valve;

(c) suitable arrangements for preventing contamination where persons are working in
confined spaces.

7.10.5. Compressors in which explosive mixtures of gas may form should be
protected against sparking.

7.10.6. Where compressor cylinders are equipped with water-cooling jackets it
should be possible to observe the water flow.

7.10.7. Intercoolers and aftercoolers should be able to withstand safely the
maximum pressure in the air-discharge piping.

7.10.8. Where necessary to prevent danger, air-discharge piping of compressors
should be provided with:

(a) a fusible plug;
(b) insulating covers to protect workers against burns, and to prevent fire risks.

7.10.9. Where necessary to prevent danger, an oil separator should be provided
between the compressor and the air receiver.

7.10.10. Where stop valves are installed in air-discharge piping:
(a) they should be easily accessible for inspection and cleaning;

(b) one or more safety valves should be installed between the compressor and the stop
valve.

7.10.11. All working parts, including speed governors, safety valves and oil
separators, should be inspected and cleaned at suitable intervals.

7.10.12. Air receivers should be equipped with:
(a) a safety valve;

(b) a pressure gauge;

(c) a drain cock.

7.10.13. Air receivers should be provided with suitable openings for inspection
and cleaning.

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