Operation
NOTE: NEVER completely expend the supply
of oxygen from a cylinder. Always leave a
The six supply cylinders are connected by means of
residual pressure in excess of 50 psi.
flexible hoses to their respective control valves (fig.
REMOVAL OF EMPTY CYLINDERS.--When
8-6). The six control valves are attached to the upper
the trailer has been in use and cylinder pressure is low,
manifolds. A pressure gauge is screwed into each
the cylinders are removed as described below.
control valve at a point below the seat. This allows each
cylinder pressure to be easily read.
1. Close all lever valves on the manifold prior to
removing any cylinders.
The oxygen flows from the upper manifold through
either of two pressure regulators via two shutoff valves.
2. Close the cylinder shutoff valves.
The oxygen is collected in the lower manifold
3. Disconnect the flexible hose that connects the
where a gauge registers the pressure of the delivery side
cylinder to the manifold.
of the system. The lower manifold is connected by
4. Loosen the clamping arrangement that holds
flexible hose to a drier that filters and dries the oxygen.
the cylinders to the trailer.
The servicing hose connects directly to the drier and
5. Install the cylinder safety caps.
has a line-servicing valve on the terminal end. The
line-servicing valve is fitted with a standard oxygen
6. Remove the empty cylinders.
cylinder connection.
Loading Cylinders
CAUTION
The servicing trailer is capable of having its
Do not attempt to remove empty cylinders while
cylinders recharged without removal. However, many
charging.
operating activities replace the empty cylinders with
full cylinders.
Figure 8-6.--Type No-2 gaseous oxygen servicing trailer (schematic).
8-12