4.7.1 In every unit means should be provided to
prevent excess pressure in any part of compressed air systems and
where water jackets or casings of air compressors and coolers might
be subjected to dangerous excess pressure due to leakage into them
from air pressure parts. Suitable pressure-relief arrangements should
be provided for all systems.
4.7.2 The starting air arrangements for internal
combustion engines should be adequately protected against the effects
of backfiring and internal explosions in the starting air pipes.
4.7.3 Starting air pipes from the air receivers
to internal combustion engines should be entirely separate from the
compressor discharge pipe system.
4.7.4 Provision should be made to reduce to a
minimum the entry of oil into the starting air pressure systems and
to drain these systems.