20.B Compressed Air and Gas Systems.
20.B.01 Standards.
- Air receivers must be constructed in accordance with the ASME "Code for Unfired Pressure Vessels."
- All safety valves used must be constructed, installed, tested, and maintained in accordance with the ASME "Code for Unfired Pressure Vessels."
20.B.02 Access and guarding.
- Compressors and related equipment must be located to provide safe access to all parts of the equipment for operation, maintenance, and repairs.
- Safety appliances, such as valves, indicating devices, and controlling devices, must be constructed, located, and installed so that they cannot be readily rendered inoperative by any means, including the elements.
20.B.03 Air hose, pipes, valves, filters, and other fittings must be pressure rated by the manufacturer and this pressure must not be exceeded. Defective hose must be removed from service.
20.B.04 Hose must not be laid over ladders, steps, scaffolds, or walkways to create a tripping hazard.
Compressed Air Safety
20.B.05 Compressed air for cleaning.
- The use of compressed air for blowing dirt from hands, face, or clothing is prohibited.
- Compressed air must not be used for other cleaning purposes except where reduced to less than 30 psi (206.8 kPa) and then only with effective chip guarding and PPE (face shield and safety glasses). This 30 psi requirement does not apply for concrete forms, mill scale, and similar cleaning purposes.
20.B.06 When used on tools and equipment such as track drills, all airlines exceeding 0.5 in (1.2 cm) inside diameter must have a safety device at the source of supply or branch line to reduce pressure in case of hose failure.
Knowledge Check Choose the best answer for the question.
20-3. Compressed air must not be used for other cleaning purposes except where reduced to less than _____ and then only with effective chip guarding and PPE.
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