1.

Foreword
1.1 Permissible medium：LCO2
Design temperature：-1960C
Working pressure： ≤2.0MPa

2. Specification
2.1
The bottle is designed as a low-temperature, thermally insulated pressure vessel designed
with a double-layer (vacuum) structure. The inner container is used to store N2 and Ar in
liquid at low temperature, and is provided with multi-layer thermal insulation material on the
outer wall thereof, which has super heat insulation performance. At the same time, the jacket
(the space between two layers of containers) is evacuated to a high vacuum to jointly form
Good insulation system.
Liner design has two safety valve overpressure to play the role of gas cylinders. In the
event of overpressure, the safety valve opens to relieve the pressure build-up caused by the
normal loss of heat loss from the insulation and support, or the pressure rise due to accelerated
leaks after the vacuum has been destroyed and under fire conditions.
The protection of the housing against overpressure is achieved by a ring-shaped vacuum
plug. If the liner leaks (resulting in an overpressure of the jacket), the vacuum plug will open
to relieve pressure. If the vacuum plug leak will lead to vacuum damage, then you can find the
shell "sweating" and frosting phenomenon. Of course, frost or condensation on the end of the
pipe connected to the bottle is normal.
Design pressure 4.0MPa, working pressure 2.0MPa, design temperature -196 ℃,
working temperature -196 ℃ (LN2) / -186 ℃ (LAr), filling factor 0.9, the main material
06Cr19Ni10 (304), the bottle is equipped with safety Valves, rupture discs, inlet and outlet
ports, gas ports, self-pressurizing ports, new level gauges, pressure gauges and automatic
pressure regulating devices in the bottle.
2.2 Level gauge
The level gauge system uses a capacitive level gauge, which consists of three subsystem
wires: a capacitance detector / plate, a signal converter and a display meter.

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 As a part of the overall cylinder, the capacitance detector is installed inside the cylinder.
Its role is based on the level of liquid level in the cylinder to produce a linear proportional
electrical signals, and sent to the signal converter. And then transmitted to the display
instrument by the converter according to the signal. The electrical signal is not affected by the
liquid level (liquid or gas phase) and the pressure, and can exactly reflect the level of the
liquid in the gas cylinder. Level sensor installed in the bottle near the end of the fill tube.
Note: The gauge uses a modular design, has been adjusted in place before the factory,
users do not need to adjust. If the measurement accuracy of the table is a problem, please
contact our service department.
2.3 Pressurizer
Pressurizer installed in the bottom of the bottle, to increase the bottle pressure, but when
the bottle liquid level is low, the supercharging speed is very slow, therefore, it is
recommended that users should be used before the bottle pressure To 0.8MPa or more, so that
the use of liquid pressure in the bottle to meet the requirements. Turbocharged when the
turbocharger to open the globe valve before the start booster, booster operator shall not leave,
should pay attention to changes in pressure, when the pressure rose to the specified pressure
to stop boosting, close the turbocharger inlet stop valve; low pressure In the specified pressure,
re-pressurization according to the above steps.
2.4 Valve

Chart 1

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No. code Name Function Remark
1 A2/A6 safety valve Protect bottle using discharge pressure 2.4MPa
High pressure
2 / pressure gage Display bottle pressure
0-6MPa
3 V2 Inlet valve Filling the liquid CO2 connection
4 A1/A4 Bursting disc Protect bottle using discharge pressure 3.6MPa
5 / Liquidometer Display the quantity of liquid
6 V1 Air release valve For pressure relief of dewar bottle
7 V3 Out of liquid valve Used to control the medium supply
8 V4 Pressure increase valve Increase pressure connection part
controller
9 V5 Pressure regulating valve Adjust pressure
a / Liquid inlet Used for filling the bottle connection
b / vent nozzle Used for bottle pressure relief connection
c / Liquid outlet Liquid outlet

3. Safety
This section of the manual deals with the necessary cryogenic equipment protection.
Liquid nitrogen, liquid argon bottle during the operation of the potential hazards mainly from
its physical properties:
Liquid nitrogen has an extremely low temperature at ambient atmospheric pressure: -
195.8 °C;
Liquid argon has very low temperature at ambient atmospheric pressure: -186 ° C;
With a large gas-liquid volume ratio, if decompression measures will lead to rapid pressure
increase. The standard liquid-to-liquid volume ratio of liquid nitrogen is 643: 1, the standard
liquid-to-liquid volume ratio of liquid argon is 780: 1

3.1 Safety measures

 Wear goggles, face mask, heat-insulating gloves;
 In the removal of parts to be repaired when the cylinder emptying, pressure relief.
Notice：
The formation of solid CO2 (dry ice): When the saturated vapor pressure of liquid
drops to 483Kpa, CO2 can form a solid state, so in the use, we must pay attention to its
pressure must be higher than this pressure to prevent the solid CO2 (dry ice) Formed and
blocked pipe.
CO2 liquid filling steps:
a) Connect one end of the hose connector to the inlet and outlet valves of medium and
high pressure cryogenic bottles;
b) Connect the other end of the hose to the corresponding valve on the tank containing

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 CO2 liquid;
c) open the pressure valve in the high-pressure low-temperature bottle, so that the
internal pressure rise;
d) Operate according to the operation manual of the tank and open the liquid phase
valve and vent valve of the tank;
e) Open the cryogenic bottle inlet and outlet valves. Through the valve to regulate the
flow and pressure of liquid;
f) Adjust the liquid valve and vent valve of the tank to maintain the pressure of the
filling pipe. The pressure in the equipment and filling pipe must be above 483Kpa,
otherwise the liquid will form solid CO2 (dry ice) to block the pipe;
g) After the filling is completed, close the large tank valve, and then close the cryogenic
bottle inlet and outlet valves and booster / regulator to release the pressure of the hose;
h) Remove the hose.

Thawing of solid CO2 (dry ice):

a) Determine the cause of the pressure drop, promptly eliminate the malfunction and
prevent recurrence;
b) connect the gas source bottle filled with high-pressure CO2 gas to icing medium and
high-pressure low-temperature bottles;
c) Open the valve of the vent valve and the gas source bottle of the cryogenic bottle, and
monitor the pressure change;
d) Observe the pressure of the frozen low-temperature bottle to 410Kpa pressure, and to
maintain this pressure, when the pressure gradually exceeds 410Kpa, indicating that the
ice has melted and continue to boost to between 1380 ~ 2070Kpa
Notice: CO2 liquid may be contaminated. Such as hydrocarbons, and not easy to clean
from the container and parts, so for filling CO2 liquid cryogenic bottles, do not allow
refilling of other gases. When changing the parts of the cryogenic bottle filled with CO2
liquid, the CO2 liquid in the bottle must be removed to prevent freezing and block the
pipeline.
3.2 Warning
 Transportation process cylinder is strictly prohibited collision;
 Protect eyes and exposed skin;
 Keep the equipment in a well-ventilated area;
 Ensure that the system is relieved when servicing or servicing equipment
 Level gauge battery, the display can not be part of the water;
4．Grounding system
No
5．Filling

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 5.1 Conventional filling
Empty bottles or first-use bottles should be filled with dry, hot, inert gas to displace the
air in the tank and remove the moisture in the tank to remove the air and impurities from the
connecting hose. The filling should only be carried out outdoors.
Cryogenic bottle filling is done via a separate hose. Filling liquid, first filling the filling
hose and the bottle connection port a, gas return hose and bottle gas phase b connection, and
then open the inlet valve V2 and gas valve V1, low temperature medium will be connected
through the hose into the bottle Liner. The liquid is sprinkled through the sprinkler pipe
mounted on the top of the liner. The purpose of this filling method is to reduce the pressure at
the top of the bottle and to reliquefy the flash vapors stored in the bottle to avoid blowout loss.
Note: The fill valve is a stop valve, which should be opened when filling.
Warning: Make sure the bottle of media before filling, such as bottle of media and
media to be filled inconsistent, the use of nitrogen completely replaced.
5.2 Deflated filling
A filling hose is used to connect the filling port on the filling stage with the filling port
of the bottle, and the gas return hose and the gas port of the bottle are connected to start filling.
When the pressure in the bottle rises, open the gas valve (Vent) V1. When the points on the
filling station show a weight of 710 (LN2,), 970 kg (LAr), stop filling (the empty weight of
the bottle is about 360 kg, marked on the cylinder nameplate with the weight of the cylinder).
Note: The pressure in a fully filled bottle rises very rapidly and may cause the quick
safety valve to open.
5.3 Hot bottle filling
Usually we will be the first time filled with low-temperature medium and stop
working for more than two weeks called empty bottle "bottle." The following is a hot
bottle filling procedure:
First of all, to the bottle filled with about 20L of liquid nitrogen or liquid argon, the
pre-cooled cylinder, 20-30 minutes later, according to the approved filling volume to the
bottle to continue filling;
When the pressure inside the bottle to normal pressure, the pipeline system leak
detection;
By reducing the pressure after venting can be carried out by conventional filling
procedures;
In addition, the blow-down filling procedure also applies to a known "hot bottle"
Note: The filling of the bottle should be the first air discharge.

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 5.4 Liquid supply
Open the liquid valve V3, the bottle of liquid will be pressed from the bottom of the
bottle into the station carburetor, after gasification and heating supply to users.
5.5 Gaseous supply
When the pressure on the bottle is high or before it is ready to shut down, open the gas
valve V1 and the vapors in the bottle are forced out of the top of the bottle into the vaporizer.
In the carburetor gasification, heating after the user. This method has a significant effect on
reducing the pressure in the bottle, and is also the best way to increase gas utilization and
extend the service life of the gas cylinder.
5.6 Liquid retention
The bottle of liquid should be left 2 ~ 3L appropriate, so that the bottle is cold, will not be
transformed into a "hot bottle."

6.Bottle storage
Bottles should be stored in a well-ventilated place and should not be exposed to prolonged
sun exposure. In addition to the following requirements, gas cylinders generally can not be
placed indoors:
1) The maximum amount of liquid medium in the cylinder is less than 15L;
2) A specially designed room (for example, ventilation control system) when the liquid
medium in the cylinder is between 15L and 430L.
7.Loading and unloading
7.1 Lifting
The bottles are designed and manufactured to withstand routine handling, however, they
can be damaged by harsh handling.
Caution: During lifting, keep the equipment steady and avoid colliding with other objects
to avoid damaging the equipment.
7.2 Move
The lower part of the bottle is fitted with four wheels, of which the gimbal mounted on
one side close to the valve and the unidirectional wheel on the other end provide the
flexibility to move in all directions.
Caution: All valves should be closed when moving the cylinder.
7.3 Transport

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 Unless the initial pressure in the container is less than 50% of the maximum working
pressure, it can not be shipped and is sealed at each outlet.
In order to prevent the bottles from moving or colliding with each other during
transportation, the ropes should be used to fix the equipment accordingly to ensure the safety
of transportation.
Warning: Can not be transported by elevator or lift; can not be transported in crowded
places or in enclosed cabins.
8.Maintenance
8.1 Leak detection
In order to ensure the normal operation of the bottle, pipeline system leak detection should
be carried out on a regular basis, if it is found that the leak point should be repaired
immediately. In some special conditions with the detector is difficult to accurately determine
the leak, you can check the leak with soap.
8.2 Leakage
Any leaks that have been discovered must be repaired:
If it is pipe thread leakage should be disconnected, clean the connection surface, the use
of the provisions of the sealant reassembly.
If the pipe leakage should be disassembled and strictly inspected, if the nut and sleeve
appearance without damage can continue to use, re-install the pipeline and tighten the nut, the
last pressure leak.
If a leak is found at the root of the safety valve or in the circuit, the pressure inside the
bottle must be vented to zero before starting service and the bottle's O2 has been completely
purged.
If a leak is found on the fill circuit, the pressure in the bottle must be vented to zero
before the start of service and the bottle's O2 has been completely purged.
8.3 Parts replacement
This section includes the knowledge of bottle maintenance and care. Before proceeding
according to the following procedure, first consult the equipment operation record and the
parts assembly drawing, and confirm the correct position according to the drawing.
 Safety valve
Bottle liner as a pressure vessel, the maximum working pressure is based on the relevant
specifications of the design and verification, and tested by the test. The data on the nameplate
of each bottle shows the highest working pressure. Usually the main relief valve opening
pressure of nominal working pressure of 1.0 to 1.2 times (but not more than 1.2 times).

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 Safety valve replacement should be carried out according to the following procedure:
1) Open the vent valve (V1, V3) to drain the tank pressure;
2) Remove the safety valve;
3) clean up the sealant and other impurities on the seat thread;
4) Install a new safety valve.
5) After the repair, leak detection reference 8.1.
Warning: Do not service or readjust safety valve.
 Manual stop valve assembly
If it is confirmed that there is a problem with a valve, the following procedures
should be followed:
First replace the parts, open the vent valve (V1), the pressure inside the bottle
drained;
1) If the vent valve is to be repaired, it should be preheated before disassembly; it is
advisable to use hot nitrogen,
2) If the liquid supply valve (V3, V4) is to be repaired, liquefy the liquid in the
cylinder to less than 1/2, vent all the pressure and preheat it;
3) No need to drain the liquid if maintenance inlet valve (V2) bleeds the pressure in
the bottle and warms it up.
4) Remove the handle fixing screws, washers, cap;
5) unscrew the bonnet, remove the stem and stem seal;
6) Remove the valve plug and bushing assembly;
7) clean the valve seat;
8) Leak detection after repair refer to 8.1
 Note: Any component in the system is absolutely forbidden to use direct flame
heating; it is forbidden to use metal tools, objects percussion, strong pull. Specific
procedures can contact our customer service department.
Vacuum failure
Normally, bottles filled with liquids with vacuum failure can experience "sweating" of
the bottle, frosting, or a sharp increase in pressure in the bottle. However, for a new bottle or a
bottle that has not been used for a long time, the pressure rises rapidly when the liquid is filled
due to the high temperature of the inner liner. This phenomenon should be normal.
Excessive pressure rise can be used as a basis for judging bottle vacuum failure. The
bottle's housing is equipped with a vacuum plug that will come off when the bottle is under

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vacuum. Usually, the vacuum plug coat with a plastic cap. Do not open the cap or vacuum
plug. If you find bottle vacuum failure, please return to the manufacturer for repair.
In short, vacuum failure is a rare occurrence, and the vacuum in the bottle is usually
maintained for several years, during which time the vacuum in the bottle is gradually (at a
very slow speed) declining. The so-called "soft" vacuum that appears on fixed bottles can be
judged by the rapid increase in pressure.
If the bottle vacuum plug is not abnormal, but also suspect vacuum failure, it must be
judged by checking the pressure rise time.
When the pressure in the test bottle rises, first fill the bottle with liquid, and then stop
when the liquid in the bottle is left with 3/4 or 1/2 remaining. The bottle is allowed to stand
for at least 12 hours and the rate of systemic pressure rise below about 0.3 MPa / d is normal.
It should be noted that the first hot bottle filling or over-filling of the bottle will also cause a
sharp increase in pressure.
A vacuum-disabled bottle, whose jacket pressure will rise at a rate of approximately 0.07
MPa / h, will show a noticeable change in pressure. Bottles especially the pipeline is more
concentrated parts and supporting the vicinity of the temperature lower than other parts of the
temperature, the shell frost or "sweating" or not depends on the ambient temperature and
humidity. The existence of this condensation phenomenon can not be used as a reliable
indicator of the existence of a bottle vacuum, and the bottle pressure rise rate test is the most
reliable and effective method of judgment.
A bottle that has been vacuum-disabled must be evacuated again by special equipment,
either on-site or unloaded. Specific operation details, please contact our customer service.

9. Emergency treatment plan

9.1 Emergency handling staff dress code:

Skin or eye contact with the liquefied medium can cause a burn injury such as burns; to
the eyes, skin and other parts of the easy contact with the liquid to be protected; wear
protective glasses or face cover, it is recommended to wear protective gloves and easy to take
off the long sleeve Sleeve, arm protection; wear no cuffs trousers, pants to cover the shoes to
block the overflow of liquid; emergency personnel should be cotton clothes, preferably no
part of the pocket did not roll up.

Caution: Do not splash or spill it.

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9.2 When overpressure relief:
At this point, should promptly open the deflation valve (V1), the bottle of overpressure
gas vented as soon as possible to the safety valve normal seat back so far. When venting air to
the atmosphere, it should be ensured in advance that there is no naked flame, combustibles
and no pedestrians in the vicinity. If the vent valve is not open enough for depressurization,
move the cylinder to an empty area, connect the hose and vent it from the inlet valve (V2).

9.3 Liner accidental leakage:

At this moment, if the internal liquid leaks and the inner container is under the pressure
of excess pressure, it is easy to cause and cause an accident. Carefully discharge the liquid in
the bottle out of the bottle or unload it into other intact bottles. If possible, the damaged bottle
should be transferred to the place without pedestrians for emergency treatment as soon as
possible.

9.4 When the valve is frozen:

If the valve is frozen, use clean, oil-free warm water or thawed nitrogen to operate. Do
not hammer or other objects percussion. Absolutely prohibit the use of flame direct heating;
prohibit the use of metal tools, objects percussion, hardened pull. Specific procedures can
contact our customer service department.

9.5 Fault and repair:

Malfunction Reason Solution
Aerated equipment set Adjust the filling device regulator to
When filling, the bottle pressure pressure too high the proper pressure.
is too high Normal phenomenon, press the
Hot bottle filling
airway to vent.
Improper pressure regulating Adjust the pressure regulator to the
When using gas, pressure in the valve adjustment appropriate pressure.
bottle is too high Pressure regulator failure,
Repair or replace pressure regulator.
damage
Over filling Fill according to the rated amount.
Normal phenomenon, increase gas
Pressure increase soon after Hot bottle filling
consumption.
filling
Loss of vacuum Return to the company maintenance.
Improper pressure regulating Adjust the pressure regulator to the
valve adjustment appropriate pressure
Repair pipe, pipe fittings. And leak
Bottle pressure is too low Gas pipeline and pipe leaks
again.
Liquid temperature is too low
Verify liquid quality and temperature
or quality problems
Before and after filling, the
Pressure gauge broken Replace the pressure gauge.
pressure gauge no response

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Safety valve open, no response
Pressure gauge broken Replace the pressure gauge.
pressure gauge
May be in use gas Normal
Cylinder head frosting Check, and then operating procedures
May be pipe leaks
overhaul.
Ambient temperature is too
Normal
Bottle sweating or frosting low, the air humidity
Vacuum failure Return to the company maintenance.
Liquid storage time is too long Using immediately or vent.

Safety valve open Increase pressure faster Check the cylinder is normal.
Safety valve set pressure is low According to the rules of safety valve
or fault replacement.
Fill the cylinder with the required
Cylinder liquid has run out
amount.
Level display zero Converter is not set properly Reset the converter capacitance.
Check each part for repair or
Monitor or converter damaged
replacement.
Converter is not set properly Reset the converter capacitance.

Liquid in the bottle after use Check each part for repair or
Monitor or converter damaged
liquid level display is full replacement
Wire breakage or connection Check the leads, dry the water and set
port water seepage the connection again
Supply pressure is too high or Check the set pressure is accurate or
Pipeline pressure regulator
too low not, the work is normal or not.
Gas, liquid has run out Filling liquid
Not gas
The supply valve is not open Open the supply valve.

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