Regulation 28

Means shall be provided to prevent excess pressure in any part of a compressed air system and wherever water-jackets or casings of air compressors and coolers might be subjected to dangerous excessive pressure due to leakage into them from air pressure parts. Suitable pressure-relief arrangements shall be provided. (2) The main starting air arrangements for main propulsion internal combustion engines shall be adequately protected against the effects of backfiring and internal explosion in the starting air pipes. (3) All discharge pipes from starting air compressors shall lead directly to the starting air receivers and all starting pipes from the air receivers to main or auxiliary engines shall be entirely separated from the compressor discharge pipe system. (4) Provision shall be made to reduce to a minimum the entry of oil into the air pressure systems and to drain these systems.