that would require replacement, such as broken gaskets
or dents that prevent sealing. One way to clean the filter
is to use LOW-PRESSURE AIR, and blow the debris
trapped in the filter against the direction of airflow from
the inside to the outside (fig. 8-12). Never exceed
pressures of 30 psi when using this method of cleaning,
and never use this method of cleaning more than six
times on the same filter. Another way you may clean the
filter is to wash it with water and a mild detergent (fig.
8-13). This is useful if compressed air is unavailable or
if the filter is clogged with grease or oily dirt. When you
are using water, do not exceed water pressures of 40 psi.
of the filter. Following service to the air cleaning system,
check and reset the air restriction indicator if required.
THE AIR RECEIVER
The air receiver is a welded steel tank installed on
the discharge side of the compressor. It acts as an oil
sump and a condensation chamber for the removal of oil
and water vapors. It stores air during the operation to
actuate the pressure control system. The oil separator
element is in the tank; and on top, are the safety valve,
automatic blow-down valve, and at least one outlet for
a service valve. Figure 8-14 is an example of a typical
air receiver-oil separator.
Gasoline or kerosene should never be used
to clean air filter elements as it causes explosive
fumes to collect in the air receiver.
Dry the filter and hold a bright light on the inside of
it. Remember, concentrated light shining through the
filter element indicates holes that require replacement
Reciprocating air compressors do not require
oil separators because oil is not circulated
through the air system. NAVSEA approved
reciprocating air compressors are the only
systems used to compress air for diving
Figure 8-14.-Typical air receiver/oil separator.