before it enters the preset regulator. (See figure 10-15,
NOTE: The number in parentheses following a
rear view.)
component name refers to figure 10-13.
Preset Regulator.--Located inside the nitrogen
Oxygen Cylinder.--As shown in figure 10-14,
module rear cover, the preset regulator (9) reduces the
the oxygen cylinder (2) is mounted in its own rack on
top of the nitrogen cylinders and held in place by a
pressure of the nitrogen coming from the cylinders and
clamp assembly. The cylinder is equipped with a
regulates the pressure at the oxygen boost pump inlet to
shutoff valve (4) that controls the flow of oxygen to and
120 to 130 psi. (See figure 10-15, rear view.)
from the oxygen module. The cylinder is grounded to
Low-pressure Manifold.--The low-pressure
the trailer frame by a grounding strap. It contains 300
manifold (10) collects the compressed air from the
standard cubic feet of gaseous oxygen at a pressure of
ship/shop, or the low-pressure nitrogen from the preset
2,400 psi when fully charged.
regulator, and directs it to the boost pump drive
NOTE: The oxygen and nitrogen modules are
pressure gauge (12), the boost pump drive valve (15),
designed so that they can be easily removed from the
and the boost pump vent valve (16). (See figure 10-15,
servicing unit for use inside an oxygen shop. When
rear view.)
used in this manner, an external source of compressed
Low-pressure Rupture Disc.--The low-pressure
air and oxygen must be provided in the oxygen shop.
burst disc (11) protects the pump in the event of
NITROGEN MODULE.--The nitrogen module,
excessive pressure. It prevents boost pump drive
figure 10-15, supplies unregulated compressed air (90
pressure from exceeding 240 psi. (See figure 10-15,
to 150 psi) or regulated gaseous nitrogen to the oxygen
rear view.)
module to drive the oxygen boost pump. Compressed
Boost Pump Drive Pressure Gauge.--The boost
air is the primary drive source for the boost pump.
pump drive pressure gauge (12) indicates the air or
Gaseous nitrogen should only be used as a drive source
nitrogen pressure delivered to the oxygen boost pump.
for the boost pump when compressed air is not
It is located on the nitrogen module panel to the right of
available. The following components are contained on
the nitrogen supply valve. (See figure 10-15, front
or within the nitrogen module. (Refer to figure 10-15 to
view.)
locate the components on the module, and to figure
10-13 to trace air/nitrogen flow.)
Ship/Shop Air Inlet Connection.--The
ship/shop air inlet connection (13) provides a means of
High Pressure Manifold.--The high-pressure
connecting an external compressed air source to the
manifold (5) provides a collecting point for the
servicing unit for driving the boost pump. The air inlet
nitrogen gas after it leaves the cylinders (1), and it
connection is located on the left side of the nitrogen
directs the gas to the nitrogen supply pressure gauge
module (See figure 10-15, left side view.)
(6) and nitrogen supply valve (7). It is mounted
underneath the top panel of the nitrogen module. (See
Shop/Ship Air Inlet Filter.--The inlet air filter
figure 10-15, rear view.)
(14) is a 10-micron, replaceable element filter (14) that
removes moisture and foreign matter from the air
Nitrogen Supply Pressure Gauge.--The
before it enters the boost pump. (See figure 10-15, rear
nitrogen supply pressure gauge (6) indicates the
view.)
nitrogen pressure in the cylinders. It is located on the
left corner of the nitrogen module panel. (See figure
Boost Pump Drive Valve.--The boost pump drive
10-15, front view.)
valve (15) provides a positive means of controlling the
air or nitrogen going to the boost pump (21). It is a
Nitrogen Supply Valve.--The nitrogen supply
two-position valve located to the right of the boost
valve (7) is a lever-operated, two-way ball valve that
pump drive pressure gauge on the nitrogen module
controls the flow of the high-pressure nitrogen from
panel. (See figure 10-15, front view.)
the cylinders (1) through the filter (8) and preset
regulator (9) to the low-pressure manifold (10). It is
Boost Pump Drive Pressure Vent.--The boost
located on the top left corner of the nitrogen module
pump drive pressure vent (16) provides a means of
panel. (See figure 10-15, front view.)
venting boost pump drive pressure and nitrogen
module gas line pressure. It is a two-position valve
Preset Regulator Filter.--The preset regulator
located on the upper right corner of the nitrogen
filter (8) is a 10-micron, replaceable element type that
removes moisture and foreign matter from the nitrogen
module panel. (See figure 10-15, front view.)
10-27
