PCI MOST 20-2B User manual

MOST 20-2B
PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
MOBILE OXYGEN
STORAGE TANK (MOST)
OPERATIONS AND SERVICE MANUAL
Including
ILLUSTRATED PARTS BREAKDOWN
MODEL MOST 20-2B
PART NUMBER – 793080-002*
* Protected under US Patent No. 2004-0226381-A1
Additional Patents Pending
PACIFIC CONSOLIDATED INDUSTRIES
12201 Magnolia Avenue
Riverside, California 92503
Telephone [phone] Fax [phone]

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
TABLE OF CONTENTS
MOBILE OXYGEN STORAGE TANK
(MOST)
Topic Page
Safety Summary ii
Dangerous Pressures ii
Working with Oxygen ii
Guidelines for Handling Cylinders ii
Safe Practices iii
Storage, Maintenance and Handling iii
Use iii
Hydrostatic Testing iii
Certified Testing Station iii
SECTION I
1-1 Introduction 1
1-2 System Overview 1
1-3 Apparatus Kit 4
SECTION II
2-1 Functional Description 5
2-2 MOST Operating Panel 5
2-3 Oxygen Output 5
2-4 Oxygen Input 5
SECTION III
3-1 Operating Instructions 6
SECTION IV
4-1 Filling Instructions 7
SECTION V
5-1 Maintenance Instructions 9
5-2 General Information 9
5-3 Maintenance 9
5-4 User Maintenance 9
5-5 General Inspection 9
5-6 Testing of Flow Control Valve 10
SECTION VI
6-1 Transfilling the MOST 11
6-2 Purpose 11
6-3 Transfilling Procedure 11
SECTION VII
7-1 Illustrated Parts Breakdown (IPB) 13
SECTION VIII
8-1 Trouble Shooting 23
LIST OF FIGURES
SECTION IX
9-1 Recommended Spare Parts 24
FIGURE Page
Figure 1-1 Cylinder Contents Gauge 1
Figure 1-2 MOST P&ID Schematic 2
Figure 2-1 MOST 20-2B 5
Figure 4-1 Cylinder Shutoff Valves 7
Figure 4-2 MOST Operating Panel 8
Figure 6-1 MOST Operating Panel 11
Figure 7-1 MOST, Medical Oxygen Storage 16
Tank (Sheet 1)
Figure 7.1.1 MOST, Medical Oxygen Storage 17
Tank (Sheet 2)
Figure 7-2 Door Assembly, Panel 18
Figure 7-3 Tubing Assembly 19
Figure 7-4 Panel Assembly 21
Figure 7-5 Plate Assy, Mounting Cyl. 22
Figure 7-6 Adapter Assembly 23
TABLE Page
Table 1-2 MOST P&ID Tag Listing 3
Table 5-1 Flow Control Valve Flow Rate 10
at 50±5 psig
Table 6-1 Capacity of MOST 20-2B After 11
Transfilling
Table 7-1 MOST, Medical Oxygen Storage 15
Tank (BOM)
Table 7-2 Door Assembly, Panel (BOM) 18
Table 7-3 Tubing Assembly (BOM) 19
Table 7-4 Panel Assembly (BOM) 20
Table 7-5 Plate Assy, Mounting Cyl. (BOM) 22
Table 7-6 Adapter Assembly (BOM) 23
Table 8-1 Trouble Shooting Guide 23
Table 9-1 Recommended Spare Parts 24

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
SAFETY SUMMARY
The following are general safety precautions that are not
related to any specific procedure and therefore do not
appear elsewhere in this technical manual. These are
general safety precautions and instructions that people
must understand and apply during many phases of
operation and maintenance to ensure personal safety and
health and the protection of Government property.
Throughout this manual you will see three types of
notations which contain special information:
NOTE: Provides additional information that may be
helpful in performing a specific task.
WARNING: Provides information about conditions
which require special attention and precautions to
avoid serious injuries.
CAUTION: Provides information about conditions
which require special attention and precautions to
avoid equipment damage.
Be sure to read the information in the notes, cautions, and
warnings carefully, and consult someone experienced in
handling oxygen equipment about any issues that are
unclear. Additional safety guidelines related to specific
components of the MOST are described in the appropriate
chapters.
DANGEROUS PRESSURES
Care must be taken during operation to ensure that all
fittings are proper and tight. All system components must
be compatible with pressure applied. Personnel must be
protected by a minimum of safety glasses when transfilling
or repairing.
WORKING WITH OXYGEN
Oxygen used in the medical profession can be very
hazardous. Although oxygen does not burn, it does support
combustion. A Material Safety Data Sheet is available at
Pacific Consolidated Industries.
Oxygen systems must be properly cleaned and inspected in
accordance with Compressed Gas Association pamphlet
G-4.1 prior to use to ensure that no combustible materials
remain in the connecting piping and fittings. If you are not
familiar with oxygen cleaning procedures contact the
Compressed Gas Association or Pacific Consolidated
Industries prior to putting oxygen into your piping and
distribution system. The Compressed Gas Association’s
web site is www.cganet.com.
Observe strict cleanliness procedures when fabricating and
connecting the oxygen piping.
Only operate the oxygen equipment in a well-ventilated
area.
GUIDELINES FOR HANDLING
CYLINDERS
While the principal function of the MOST is to provide
gaseous oxygen for medical use, conventional oxygen
cylinders are still an integral part of the method for
supplying backup oxygen and for mobile oxygen
requirements (for example, on board ambulances).
Oxygen cylinders are under extremely high pressure (as
much as 2,250 psi) and present a number of associated
hazards as a result.
WARNING: The sudden release of this pressure,
whether by puncture, dropping, or loss of pressure
can easily turn the cylinder into a projectile
hurtling across the ground and through the air.
Take extreme care when filling cylinders and
when handling charged cylinders.
WARNING: Do not drag or slide cylinders or lift
them by the pressure cap; this may damage the
cylinders and cause the sudden release of,
cylinder pressure. Use a suitable hand truck,
forklift, roll platform, or similar device to move
cylinders.
WARNING: Do not drop cylinders or permit them
to strike against each other or other surfaces; this
may damage the cylinders and cause the sudden
release of cylinder pressure. Firmly secure
cylinders during moving and transport.
WARNING: Do not fill cylinders too rapidly.
Excessive heat may build up in the gas and result
in a failure of the seals in the cylinder valves and
possible ignition.

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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
WARNING: Periodically check the surface
temperature of the cylinders during charging
operations. Allowing excessive heat to build up in
the gas will result in a failure of the seals in the
cylinder valves and possible ignition.
WARNING: Never shut off a line without verifying
that a suitably rated relief valve or bleed off valve
has been installed between the two shutoff valves.
Failure to do so can result in a rupture of the line
and possible ignition.
WARNING: Never charge cylinders with oxygen
that are marked for other gases. Always check the
cylinder markings and ensure that only cylinders
marked for oxygen are charged with oxygen.
Failure to do so can result in contamination of the
patient oxygen supply.
SAFE PRACTICES FOR HANDLING AND
OPERATING OXYGEN EQUIPMENT
Oxygen used in the medical profession can be very
hazardous. Although oxygen does not burn, it does support
combustion. A material, which will not burn in air, may
burn in a high-pressure pure oxygen - such as the metal in
oxygen regulators or cylinders. Some general guidelines
for minimizing the chance of fire are provided below:
STORAGE, MAINTENANCE AND
HANDLING
•Do not allow smoking around oxygen.
•Store oxygen in clean, dry locations and away
from direct sunlight.
•Do not allow valves, regulators, gauges, and
fittings to come into contact with oils, greases,
organic lubricants, rubber or any other combustible
substance.
•Make sure that any cleaning, repair or transfilling
of oxygen equipment is performed by qualified,
properly trained staff.
•Do not work on oxygen equipment with ordinary
tools. Designate special tools, clean them and store
them for “Use With Oxygen Equipment Only”.
•Use plugs, caps and plastic bags to protect “off
duty” equipment from dust and dirt.
USE
•Make sure that personnel using oxygen equipment
are adequately trained in its operation and in
oxygen safety and have knowledge of
manufacturer’s instructions for using the
equipment.
•Open the cylinder valves slowly and completely to
minimize the heat produced and achieve the
desired flow conditions within the equipment.
WARNING: Composite cylinders require
Hydrostatic Testing at five (5) year intervals.
Check Hydrostatic Test plate prior to filling to
ensure cylinders testing is current.
Relief Valves require testing at (2 to 3) year
intervals to ensure accuracy.
NOTE: IT IS RECOMMENDED THAT THE
TESTING BE PERFORMED AT THE PCI
FACILITY
HYDROSTATIC TESTING
Cylinders must be re-inspected and hydrostatically retested
at least once every five years. Testing must be performed
in accordance with DOT-CFFC-13 tested to 5/3 of the
marked service pressure, 49 CFR S 180.205, the latest
edition of CGA pamphlet C-6.2, and DOT-E 13250.
CERTIFIED TESTING STATION
The testing facility must be approved under DOT 49
CFR-180.205, part 1, part 107.

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
1-1 INTRODUCTION
The MOST 20-2B of P/N 793080-002 references the fact
that the cylinder liner is made of brass and is designated
for 2,250 psi fill pressure.
1-1.1 Indications For Use
The Mobile Oxygen Storage Tank (MOST) is intended to
provide USP 93% (+7%/-3%) oxygen at 50psig nominal
pressure for supplemental oxygen use only.
1-1.2 Mobile Oxygen Storage Tank (MOST)
The MOST was initially designed to meet the demands of
the mobile medical oxygen delivery/transport. The
availability of transportable medical oxygen is a prime
factor in aiding trauma patients.
Initially, oxygen demand was met by use of high-pressure
steel oxygen cylinders. Cylinders satisfied the requirement
for oxygen but created unacceptable logistical burdens
associated with transportation, refill, and storage.
The introduction of the liquid oxygen based systems
reduced the size and weight of the oxygen delivery
equipment and replaced many applications previously
filled with the oxygen cylinders, but created additional
problems. Liquid oxygen cannot be stored. It must remain
below -297°F to stay in a liquid state and it rapidly boils
off losing as much as 5% per day. Transportation over long
distance results in a high percentage of loss.
There is an urgent need for an oxygen transportation
system that can be stored and stockpiled, ready for
immediate use, transported with the medical unit and
totally self sufficient for as long as required. It also has to
be easy to operate dependable and as small and light as
possible. The Mobile Oxygen Storage Tank (MOST) has
been developed to address these requirements.
1-2 SYSTEM OVERVIEW
The Mobile Oxygen Storage Tank (MOST) is a storage and
distribution system consisting of lightweight, high strength,
high-pressure composite wound brass lined cylinders secured
within a rugged case. The MOST contains 10,000 liters of
oxygen when filled to 2,250 psig. The MOST has a maximum
flow capability of 150 lpm at 50 psig (50 lpm per Oxygen
Output fitting).
The operating panel on the end of the unit contains the
following:
●One high pressure Oxygen Input fitting is
provided for filling the MOST from various high-
pressure sources.
●A Cylinder Contents Gauge indicates the cylinder
pressure (both cylinders combined).
●Three Oxygen Output fittings are provided to
attach the Oxygen Conducting Delivery Hose(s)
that supply oxygen to the patients.
●An Output Pressure Gauge indicates the output
pressure of the oxygen.
A Cylinder Contents Gauge (P1-1) is provided on the long
side of the case. This pressure gauge is marked in liters
indicating the liters of oxygen remaining in the MOST. It
is placed in this position to allow reading of the remaining
capacity from either the side or the end of the unit. When
filled to 2,250 psig, the MOST contains 10,000 liters of
oxygen (See Fig 1-1).
Cylinder Contents Gauge
Figure 1-1
SECTION I

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
MOST P&ID Schematic
Figure 1-2

MOST 20-2B
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Tag No Description PCI Part No
ADP-1 ADAPTER- CGA540 TO HP QUICK CONNECT - ST. STL 790510-012
BD-1 BURST DISK - 3300 PSI – BRASS/MONEL 582388-004
BD-2 BURST DISK - 3300 PSI – BRASS/MONEL 582388-004
C-1 SERVICE CONNECTOR – SCHRADER FEMALE QUICK CONNECT ST. STL 581706-001
C-2 SERVICE CONNECTOR – SCHRADER FEMALE QUICK CONNECT ST. STL 581706-001
C-3 SERVICE CONNECTOR – SCHRADER FEMALE QUICK CONNECT ST. STL 581706-001
C-4 FILL CONNECTOR – SWAGELOK HP FEMALE QUICK CONNECT 581438-019
CV-1 MINIMUM PRESSURE CHECK VALVE – 10 PSIG – ST. STL 7905674-036
CV-2 MINIMUM PRESSURE CHECK VALVE – 5 PSIG – ST. STL 7905674-045
CV-3 ISOLATION CHECK VALVE – 1 PSIG – ST. STL 7905674-044
CV-4 ISOLATION CHECK VALVE – 1 PSIG – ST. STL 7905674-044
CYL-1 STORAGE CYLINDER – BRASS LINED – 2250 PSI – 1.09 CU. FT 582515-001
CYL-2 STORAGE CYLINDER – BRASS LINED – 2250 PSI – 1.09 CU. FT 582515-001
F-1 FILTER – SINTERED STAINLESS STEEL 581530-007
F-2 FILTER – SINTERED BRONZE VENT SCREEN 581677-002
FCV-1 FLOWMETER – 0-15 LITERS 792975-001
FVC-2 FLOWMETER – 0-15 LITERS 792975-001
FVC-3 FLOWMETER – 0-15 LITERS 792975-001
OR-1 ORIFICE - .047 INCH DIA. – STAINLESS STEEL 581996-008
PI-1 PRESSURE GAUGE – CYLINDER – 0-5000 PSI - BRASS 793674-039
PI-2 PRESSURE GAUGE – CYLINDER – 0-5000 PSI - BRASS 793674-039
P1-3 PRESSURE GAUGE – DELIVERY – 0-100 PSI - BRASS 793674-038
PRV-1 PRESSURE REDUCING VALVE - BRASS 792993-001
RV-1 RELIEF VALVE – CYLINDER – 2360 PSI – STAINLESS STEEL 791756-501
RV-2 RELIEF VALVE – DELIVERY PRESSURE – 60 PSIG - STAINLESS STEEL 793503-602
V-1 SHUTOFF VALVE – CYLINDER - BRASS 793674-047
V-2 SHUTOFF VALVE – CYLINDER - BRASS 793674-047
V-3 VENT VALVE - BRASS 793674-047
MOST P&ID Tag Listing
Table 1-1

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
Eight handles, two on each long side of the MOST and two
on the top at each end, are provided for ease of
transportation.
The exterior dimensions of the MOST are:
Length 37.25”
Width 27.25”
Height 15.50”
The MOST weighs approximately 200 pounds fully
charged to 2,250 psig.
Operating Temperature: -40°F to 140°F
The MOST contains an Apparatus Kit, which includes the
equipment required to distribute the oxygen to up to three
patients concurrently. To access the Apparatus Kit unlatch
the MOST top cover and tilt it to the up position.
The Apparatus Kit contains:
•Three Oxygen Conducting Delivery Hose(s), 20 feet
long wound on individual holders. One end of the
hose has a quick connect fitting that attaches to the
Oxygen Output connector on the MOST Operating
Panel. Shown on Figure 4-2, Item 5. The other end of
the hose has a fitting that attaches to the Flow
Selector.
•Three Flow Selectors receive the oxygen from the
Oxygen Conducting Delivery Hose(s) at 50 psig. The
Flow Selector regulates the output flow from each
output. The Flow Selectors are adjustable in quantities
of 0.0, 0.5, 1, 2, 3, 4, 5, 6, 8, 10, and 15 lpm.
1-3 APPARATUS KIT

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
SECTION II
2-1 FUNCTIONAL DESCRIPTION
2-2 MOST OPERATING PANEL
The MOST Operating Panel contains the connecting port
necessary to refill the MOST with high-pressure oxygen
and the fittings necessary to provide distribution of the
oxygen. A valve (V-3) in the filling circuit allows the
release of pressure in the vent position. Without a vent
position, the full cylinder pressure would be constantly on
the fitting, making it impossible to remove or insert the
quick connect hose fitting. The operating Panel includes
two pressure gauges.
The Cylinder Contents Gauge (P1-1), indicates the pressure
of the remaining oxygen and therefore the remaining
quantity of oxygen. The Output Pressure Gauge indicates
the pressure of the oxygen being supplied to the Oxygen
Output Fittings and Hoses. Three quick connect Oxygen
Output ports and one quick connect Oxygen Input port are
located in the center of the panel. A vent port for the
internal pressure relief devices is also located on this panel
(See Fig 4-2).
Prior to attaching an Oxygen Hose to the MOST, the Flow
Selector must be placed on the opposite end of the Oxygen
Hose. The correct end has a small hand wheel to assist the
connection of the hose to the threaded fitting on the end of
the Flow selector, which is marked "INLET". Ensure that
the Flow Selector is set to "0" before connecting to the
hose.
There are three Oxygen Output quick connecting ports on
the MOST Operating Panel. Each port is equipped with a
protective plug attached to the panel by a lanyard. The
protective plug should always be in place when the
respective output fitting is not being used. The Oxygen
Output fittings are used to connect the tapered end of the
Oxygen Conducting Delivery Hose(s) to the MOST.
Pressure is applied on the hose as it is inserted into the
fitting. When fully engaged, the hose fitting is captured by
the output fitting. The oxygen is then free to flow through
the hose. The hose is released by grasping the fitting
mounted on the panel and twisting the fitting in a
clockwise direction. A one quarter turn will release the
hose fitting.
2-4 OXYGEN INPUT
The MOST high-pressure composite wound cylinders are
designed for an operating pressure of 3,000 psig.
The MOST was designed as a functional component of the
Expeditionary Deployable Oxygen Concentration System
(EDOCS-120). The EDOCS-120 generates 120 liters per
minute (lpm) of USP 93% oxygen at 100 psig. It can also
deliver 60 lpm at 2,250 psig to fill the MOST. Each
EDOCS-120 is equipped with a stainless steel high-
pressure hose that may be used to connect the EDOCS-120
to the Oxygen Input fitting on the MOST Operating Panel.
There is no shut off valve or flow adjustment valve located
on the panel. In order to release the fittings the filling
valve must be turned to the ‘vent’ position.
Although the MOST was designed for use with the
EDOCS-120, GOX Carts, H-Cylinders or any other
sources of USP grade oxygen may also be used. The
EDOCS-120 can deliver USP grade oxygen at 93% while
the latter systems can deliver USP grade oxygen between
90 to 100%
.
IDENTIFICATION LABEL
MOST 20-2B
Figure 2-1
2-3 OXYGEN OUTPUT

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
SECTION III
3-1 OPERATING INSTRUCTIONS
WARNING: Ensure no flames or sparking devices
are in the immediate area. Ensure Oxygen
Delivery Hose, Flow Selector, and Oxygen
Output connections are clean and free of debris.
Use only authorized cleaning procedures.
1. Open top lid of case to access accessories.
2. Remove Oxygen Conducting Delivery Hose(s) and
Flow Selectors as required.
3. Inspect hoses for visual cracks, kinks, abrasion, etc.
Do not use if damaged.
4. Unwind hose from reel, unthread hose end from reel
fitting and return reel to storage tray.
5. Remove caps from flow control ports and replace caps
in tray.
6. SLOWLY OPEN the Cylinder Shutoff Valves (V-1 &
V1-2).
7. Check Output Pressure Gauge. Pressure should read
50 psi + 5 psi. Re-adjust if required. To adjust the
regulator if it is out of range, open case and turn the
tee handle on top of the regulator (RV-2) until it is
back in range. NOTE: The regulated pressure cannot
exceed the relief valve which is set at 60 psi. If the
pressure is set above the relief valve setting it will
result in loss of product.
8. Close top lid of case and secure MOST in desired
position.
9. Connect Flow Selector to Oxygen Delivery Hose.
Ensure Flow Selector is closed (set to 0).
10. Remove the Access Panel.
11. Remove protective cap on Oxygen Outlet Port.
12. Connect a Oxygen Delivery Hose to each Oxygen
Output Port on MOST (C-1, C-2 & C-3). Ensure that
the Quick Connect Fittings are fully engaged and
captured.
13. Attach desired patient interface equipment to the Flow
Selector.
14. Adjust flow control on Flow Selectors to prescribed
level.
CAUTION: Flow selector MUST be connected in line
prior to connecting the Delivery Hose to the
MOST OUTLET PORT.
15. After Use Steps:
●Rotate collar on the output fitting to remove hose.
●Replace plugs on outlet fittings.
●Disassemble hose and flow controls.
●Place caps on flow controls.
●Open lid to retrieve Reels.
●Attach the hose to the reel fittings.
●Rewind hose on reel, secure with Velcro strap.
●Return hoses and flow controls to tray.
WARNING: Discontinue use when cylinder pressure is
less than 50 psi.
WARNING: When utilizing patient interface
equipment (cannula, mask, ventilator), refer to
interface equipment operations manual for proper
usage.
CAUTION: Flow selector MUST be connected in line
prior to administration of oxygen.

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SECTION IV
4-1 FILLING INSTRUCTIONS
WARNING: Fill the MOST with high purity
oxygen conforming to OXYGEN, USP. Ensure
no flames or sparking devices are within a 50 ft
radius of MOST or the High Pressure Supply (No
Smoking).
Filling of the MOST should be conducted
outdoors. Ensure High Pressure Oxygen Supply
Line and Oxygen Input Port connections are
clean and debris free.
Use only authorized cleaning procedures.
Connections contaminated with oils or
hydrocarbons can easily initiate a fire.
Always open the oxygen valves slowly to
minimize the compression heating problem.
WARNING: Composite cylinders require
Hydrostatic Testing at five (5) year intervals.
Check Hydrostatic Test plate prior to filling to
ensure cylinders testing is current.
1. Ensure hands are clean or wear lint free clean gloves.
2. Ensure High Pressure Oxygen Source is SHUT OFF.
3. Ensure Venting Valve is in VENT position.
See Figure 4-2.
4. Disconnect all hoses from the Oxygen Outlet
Connectors.
5. SLOWLY OPEN the Cylinder Shutoff Valves.
See Figure 4-1.
6. Remove protective plug on Oxygen Input Port.
7. Attach high-pressure oxygen source hose between the
source device and the MOST oxygen input port (use
Adaptor fitting if required).
8. SLOWLY turn the Venting Valve on MOST
to the CLOSED position (See Figure 4-2).
9. VERY SLOWLY OPEN the High Pressure Oxygen
Supply valve on source device. The MOST will begin
filling at a rate of approximately 200 psi/minute.
10. Do not exceed fill pressure of 2,250 psi as indicated
by the cylinder contents gauge.
11. When filling is complete, CLOSE the High Pressure
Oxygen Supply Valve at source device.
12. Switch Venting Valve (V-3) to VENT position.
(Oxygen will briefly vent through Vent Port)
13. Remove High Pressure Oxygen Supply Hose from
Oxygen Input port (C-4).
14. Switch Venting Valve to CLOSE position.
15. Replace protective cap on Oxygen Input port.
16. SLOWLY CLOSE the Cylinder Shutoff Valves.
(Shutoff Valves)
Cylinder Shutoff Valves V-1 & V-2
Figure 4-1
Note: Close shutoff valves for long-term storage

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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
ITEM DESCRIPTION
1 CYLINDER CONTENTS GAUGE P1-1:
Direct reading of the pressure in all
cylinders. Pressure automatically
equalized between cylinders.
2 VENT VALVE V-3: Controls release of
pressure from filling circuit. When filling
the valve is set to close and when venting
is set to vent.
3 OXYGEN INPUT C-4: High pressure,
self-sealing, quick disconnect fitting for
refilling MOST cylinders.
4 OUTPUT PRESSURE P1-3: Direct
reading gauge showing oxygen pressure
being delivered to the three OXYGEN
OUTPUT ports.
5 OXYGEN OUTPUT C-1, C-2 & C-3:
Self-sealing, quick connect fittings for
connection of the green oxygen delivery
hoses.
6 VENT F-2: Vents excess pressure from
RV-1, RV-2 and V-3
MOST Operating Panel
Figure 4-2
2 3
65
1
4

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SECTION V
5-1 MAINTENANCE INSTRUCTIONS
FOR MOST 20-2B
5-2 GENERAL INFORMATION
This section contains instructions essential for
maintenance of the MOST 20-2B Mobile Oxygen Storage
Tank.
WARNING: Do not use oil, or any material
containing oil, with oxygen equipment. Oil, even in a
minute quantity, coming in contact with oxygen can
increase the potential of explosion or fire. Dust, lint and
fine metal particles are also dangerous.
5-3 MAINTENANCE
5-3.1 Tools and Equipment.
Only common tools are required to maintain the MOST
20-2B. The tools must be oxygen safe, non-sparking and
oil free.
5-3.2 Service Life.
The MOST 20-2B can remain in service for 5 years before
the cylinders need to be tested. All other components of
the unit can remain in service as long as they continue to
function.
5-4 USER MAINTENANCE
5-4.1 Hoses and Hose Connectors.
a. Prior to use, inspect hoses for cracks, kinks cuts, etc.
Replace any damaged hoses.
b. Check all hoses and quick connectors for evidence
of foreign particles and oil. Oxygen clean all
surfaces that have contamination. Use only approved
USAF cleaning solvents and procedures.
c. Always keep protective covers on the quick
disconnect fittings when hoses are not connected.
d. Attach supply hoses to the hose reel assemblies and
rewind. Stow them in the pockets provided in the
accessories tray.
5-4.2 General Maintenance.
a. Clean interior of MOST 20-2B assembly with a clean,
dry, oil and lint free cloth.
b. Secure the caps on the flow control valve inlets and
outlets. Stow the valves in the pockets in the
accessories tray.
c. Check filter (F-1). Remove filter cover with
appropriate open ended wrench. If found
contaminated, replace element. If not dirty re-install.
Vent Valve (V-3) must be in the Vent position prior
to performing this operation.
5-4.3 Unscheduled Maintenance.
If any components are found to be non-operable or
defective, repair or replace the component.
5-5 GENERAL INSPECTION
Inspect the MOST 20-2B at least once a month. When
performing general inspections, check the following items.
a. Check the case assembly for dents, gouges, missing
fasteners or other damage.
b. Check the handles, latches, hinges and dolly wheels for
smoothness of operation, damage and proper function.
c. Check the pressure gauges for cracked or broken
glass.
d. Check the quick connecting ports for general
condition, for smooth and positive action, freedom
from contamination, that the dust covers are installed
and for cleanliness of the surrounding area.
e. Check the flow control valves for cleanliness and for
smooth operation throughout the adjustment range.
f. Check the oxygen hoses for end fitting condition,
excessive hose wear and flexibility, obvious physical
damage and cleanliness.
g. Check the accessories tray contents for three flow
control valves, three oxygen hoses on racks and one
(-5) 37° flare-to-high pressure quick connect adapter
fitting.
h. Check the tubing and fittings for tightness and leaks.
Use oxygen compatible soap solution for checking
for leaks.

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
i. Check that the burst disk protective covers are in
place.
j. Check the vent valve for smoothness of operation.
Check that the handle is not loose.
5-6 TESTING OF THE FLOW
CONTROL VALVE
Note: The flow control valve delivery rates cannot be
adjusted but the rates can be verified for accuracy.
To verify the flow control valve rates perform the
following procedures.
a. Fill a MOST 20-2B to the proper pressure or use an
already filled unit. Optionally follow the instructions
in step (i).
WARNING: The sequence in steps (b.) through
(d.) must be followed to preclude release of oxygen
at pressure from an unrestricted hose outlet.
b. Assemble a tee fitting between a supply hose outlet
and a flow control valve. Add a master gauge with a
0-100 psig range to the tee fitting.
c. Using a short piece of tubing, connect a rotameter
capable of reading from 0 to 20 liters per minute
(LPM) to the valve outlet.
d. Set the flow control valve to the “0” flow rate
position.
e. Insert the supply hose male quick disconnect into
one of the output quick disconnect fittings on the
MOST 20-2B panel.
f. Observe that the master pressure gauge remains
within the 50±5 psig during the gas flow. To adjust
the regulator if it is out of range, open case and turn
the tee handle on top of the regulator (RV-2) until it
is back in range. Close case and continue. NOTE:
The regulated pressure cannot exceed the relief valve
which is set at 60 psi.
g. Set the flow control valve at each of the flow
positions and establish that the rotameter reading is
comparable to the flow tolerances as shown in Table
5-1.
h. Replace any flow control valve that does not
perform to the values in Table 5-1.
i. An alternate test method may be employed by
substituting for the MOST 20-2B a cylinder of
oxygen per MIL-PRF-27210G with a pressure
regulator and gauge in line to the flow control valve
and rotameter.
VALVE POSITION FLOW- SLPM OXYGEN
0 .............................. NO LEAKAGE
2 .............................. 2.35-1.68
4 .............................. 4.59-3.47
6 .............................. 6.88-5.17
8 .............................. 9.17-6.89
10 ............................. 11.47-8.61
15 ............................. 17.21-12.92
Flow Control Valve Flow Rate at 50±5 psig.
Table 5-1

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
SECTION VI
6-1 TRANSFILLING THE MOST
6-2 PURPOSE
The MOST can be filled from the following devices: EDOCS-
120, GOX Carts and ‘H’ Cylinders or other sources of USP
grade gaseous oxygen. Table 6-1 shows the capacity
achievable by transfilling under various scenarios. The
‘H’ Cylinders are assumed to be at 2,250 psig and the values
in the table are approximate.
‘H’ Cyl
Qty
MOST Initial
Pressure- psig
Final Pressure-
psig
MOST
Oxygen
Capacity-
Liters
Empty 940 4230
250 1080 4850
500 1230 5490
750 1370 6130
1000 1520 6780
1
1500 1810 8070
Empty 1330 5930
250 1430 6370
500 1530 6820
750 1630 7270
1000 1730 7730
2
1500 1940 8640
Empty 1670 7440
250 1730 7710
500 1800 8000
750 1850 8280
1000 1920 8570
4
1500 2050 9140
Empty 1820 8130
250 1870 8330
500 1920 8540
750 1970 8750
1000 2010 8960
6
1500 2110 9370
Empty 1915 8530
250 1950 8680
500 1990 8850
750 2025 9010
1000 2060 9180
8
1500 2140 9500
Table 6-1 Capacity of MOST20-2B After Transfilling.
MOST Operating Panel
Figure 6-1
6-3 TRANSFILLING PROCEDURE
Unless otherwise specified, refer to Figure 6-1
MOST Operating Panel.
a. Position the high pressure quick connect vent valve
(V-3) to the vent position.
b. Remove the protective plug from the high pressure
input quick connecting port (C-4). Install the
transfilling adapter fitting (ADP-1), part number
790510-012, into the quick connect fitting. Ensure
that the adapter fitting is firmly engaged by the quick
connect fitting by pulling on the fitting.
c. Place the MOST on an elevated surface such as a
work bench or table. Position the ‘H’ cylinder as
close to the control panel as possible.
d. Connect one end of a clean conductive hose
assembly to the ‘H’ cylinder shutoff valve and the
other end of the pigtail to the transfilling adapter.
Tighten the fitting securely.
V-3 C-4
PROTECTIVE
PLUG ADP-1ADP-1

MOST 20-2B
12
PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
NOTE:
The hose assembly must be rated for maximum
working pressure of the supply source. The length
of the hose assembly should be sufficient to allow
connection between the ‘H’ cylinder and the MOST
20-2B without kinking of the hose.
e. Position the high pressure quick connect vent valve
(V-3) to the closed position.
f. Slowly open the shutoff valve on the ‘H’ cylinder.
The MOST cylinders will begin filling at a rate of
about 200 psig per minute.
NOTE:
The MOST incorporates a restrictor orifice (OR-1)
that limits the filling rate to a maximum of 200 psig
per minute. No special regulators or valves are
required to accomplish a safe transfilling of the
MOST.
g. When the pressure stops rising in the MOST, close
the shutoff valve on the ‘H’ cylinder.
h. Open the vent valve (V-3) on the MOST panel.
i. If further transfilling is required, disconnect the hose
from the filling source and reconnect it to the next
filling source. Otherwise, remove the hose from the
MOST, remove the transfilling adapter, ADP-1, and
install the protective plug on the high pressure quick
connect fitting, (C-4).

MOST 20-2B
13
PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
ILLUSTRATED PARTS BREAKDOWN
MOBILE OXYGEN
STORAGE TANK
MODEL MOST 20-2B
PART NUMBER – 793080-002*
* Protected under US Patent No. 2004-0226381-A1
Additional Patents Pending
PACIFIC CONSOLIDATED INDUSTRIES
12201 Magnolia Avenue
Riverside, California 92503
Telephone [phone] Fax [phone]
SECTION VII

MOST 20-2B
14
PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
7.1 LIST OF FIGURES
Page
Figure 7-1 Medical Oxygen Storage Tank. MOST (Sheet 1) 16
Figure 7-1-1 Medical Oxygen Storage Tank. MOST (Sheet 2) 17
Figure 7-2 Door Assembly, Panel 18
Figure 7-3 Tubing Assembly 19
Figure 7-4 Panel Assembly 21
Figure 7-5 Plate Assembly, Mounting-Cylinders 22
Figure 7-6 Adapter Assembly 23

MOST 20-2B
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PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
Figure &
Index No.
Part Number FSCM Description Units Per
Assy.
SMR
Code
Usable
On Code
7-1 793080-002 75906 ASSEMBLY-B, BRASS CYL (GREEN).... REF PEFFFU
-1 793253-003 75906 . CASE, FABRICATED-GREEN................ 1
-2 793881-001 75906 . LABEL, CAUTION................................... 1
-3 793255-001 75906 . BRACKET, ANGLE.................................. 1
-4 792993-001 75906 . REGULATER ASSY, PRESSURE........... 1
-5 793257-001 75906 . DOOR ASSY, PANEL............................... 1
-6 793259-001 75906 . TUBING ASSY.......................................... 1
-7 793270-001 75906 . PANEL ASSY............................................ 1
-8 793288-002 75906 . FITTING, CYLINDER............................... 2
-9 793437-001 75906 . LABEL, CYLINDER CONTENTS............ 1
-10 793456-001 75906 . LABEL, INSTRUCTIONS, OPER............ 1
-11 793463-001 75906 . COVER ASSY, BURST DISC................... 1
-12 793475-002 75906 . LABEL, Rx ONLY..................................... 1
-13 793854-001 75906 . PLATE ASSY, MTG, CYL........................ 1
-14 793855-001 75906 . TRAY, ACCESSORIES............................. 1
-15 790510-012 75906 . ADAPTOR ASSEMBLY........................... 1
-16 793503-602 75906 . VALVE, RELIEF....................................... 1
-17 793475-001 75906 . LABEL, GROUND USE ONLY............... 1
-18 793258-001 75906 .WINDOW, GAUGE................................... 1
-19 793495-002 75906 . NAMEPLATE............................................ 2
-20 4591K12 3A054 . TAPE, THREAD SEAL............................. AR
-21 CB3200-1BLA 3B4S7 . CYLINDER, COMPOSITE........................ 2
-22 793674-039 75906 . GAUGE, PRESSURE................................. 1
-23 792980-001 75906 . HOSE ASSEMBLY.................................... 3
-24 792975-001 75906 . FLOWMETER ASSY................................ 3
-25 CD13539 25515 . DISC HOLDER.......................................... 2
-26 8026250 25515 . DISC, BURST....TAG # BD1 & 2............. 2
-27 50C-0021-0014 19062 . HOSE RACK ASSEMBLY........................ 3
-28 ¼ HHP-B 30780 . PLUG, PIPE, SOC HD............................... 1
-29 141 56501 . NUT, LOCK, ELEC................................... 1
-30 5262 56501 . SEAL, ELEC.............................................. 1
-31 MS17830-06C 96906 . NUT, LOCK, REG- 6 - 32 unc................... 4
-32 3-908V747-75 02697 . O-RING, SEA- 08....................................... 2
-33 MS51957-31 96906 . SCREW PAN HD -6 -32 unc x .62............. 4
-34 MS51960-69 96906 . SCREW, FLT HD- 10 - 32 unf x .1.00....... 8
-35 MS51957-34 96906 . SCREW, PAN HD- 6 -32 unc x 1.00.......... 3
-36 MS51958-65 96906 . SCREW, PAN HD- 10 - 32 unf x .75......... 2
-37 92949A540 3A054 . SCREW, BUTTON HD .25 -20 unc x .75.. 11
-38 MS35307-306 96906 . BOLT, HEX HD- .25 -20 unc x .75............ 2
-39 MS21044-C3 96906 . NUT, LOCK, REG- 10 -32 unf.................. 2
-40 MS35307-313 96906 . BOLT, HEX HD- .25 -20 unc x 1.75.......... 1
-41 MS35307-316 96906 . BOLT, HEX HD- .25 - 20 unc x 2.50......... 2
-42 MS35307-332 96906 . BOLT, HEX HD- .312 - 18 unc x .75......... 1
-43 MS17830-4C 96906 . NUT, LOCK, REG- .25 – 20 unc............... 9
-44 MS15795-810 96906 . WASHER, FLAT- .281 ID........................ 11
-45 MS15795-812 96906 . WASHER, FLAT-.344 ID.......................... 2
-46 MS35338-139 96906 . WASHER, LOCK- .225 ID........................ 2
-47 MS35338-140 96906 . WASHER, LOCK- .318 ID........................ 2
-48 MS17830-06C 96906 . NUT, LOCK, REG- 6 - 32 unc................... 7
-49 MS21044-C3 96906 . NUT, LOCK, REG- 10 -32 unf.................. 2
-50 MS17830-4C 96906 . NUT, LOCK, REG- .25 – 20 unc............... 9
-51 5613-250R-62 86928 . WASHER, FLAT- .281 ID (NEOPRENE). 2
Table 7-1, BOM (Ref. Figure 7-1)

MOST 20-2B
16
PACIFIC CONSOLIDATED INDUSTRIES 350003 Rev D
Medical Oxygen Storage Tank. MOST
Figure 7-1