8.1.2 If
compressed air is the only means of adjusting ballast or is utilized
for other essential operational purposes, at least two sources of
air supply are to be provided.
8.1.3 Stop
valves in compressed air supply lines to closed piping systems are
to permit slow opening to avoid sudden pressure rises in piping systems.
8.1.4 Pipelines
which are situated on the low pressure side of reducing valves, and
which are not designed to withstand the full pressure at the source
of supply, are to be fitted with pressure gauges and with relief valves
having sufficient discharge capacity to protect the piping against
excessive pressure.