Air Liquide ALPHAGAZ OP 350 User manual

R1-08/04/14
ALPHAGAZ logotype - cmyk
AIR LIQUIDE 62386
C 100
M 16
Y 0
K 27
C 0
M 20
Y 100
K 0
OP 350
Manifolds
Steel /brass
Operating manual

2
Manifolds steel /brass
Content Page
1Preliminary notes – Warranty and liability 4
2 Usage 5
2.1 Function 5
2.2 Type of Gas 5
2.3 Devices for requiring acceptance plants 5
2.4 General conditions for operation, transport and storage 5
2.5 Connections 5
2.6 Intended use 5
2.7 Guidelines 6
3Safety instructions 7
3.1 The handling of gases 7
3.2 Gas-specific design 7
3.3 Duties of the operator 7
3.4 Duties of the personnel 7
3.5 General regulations and notes 7
3.6 The resistance of the materials 7
3.7 Purging – leakage of harmful gases and vapors 7
3.8 Dangers due to pressure energy 7
3.9 Special hazards due to leakage 7
3.10 Dangers due to electrical energy 8
3.11 Cleaning the gas appliances and disposal of residues 8
3.12 Notes on special types of gas 8
4 Marking 8
4.1 Name plate 8
4.2 CE marking 8
5Flow scheme 9
6 Installation 10
6.1 Assembly 10
7 Operation 11
7.1 Commissioning 11
7.2 Changeover and cylinder change 11
7.3 Decommissioning 11
8Operation of the gas shortage warning device 12
8.1 General operation of the gas shortage warning device 12
8.2 Notes on pressure transmitter or cylinder scale 12
9Instructions for operation and maintenance 13
9.1 Troubleshooting 13
9.2 Maintenance 14
9.3 Repairs 15
9.4 Disposal and recycling 15
10 Gas compatibility 16

3
SGA2 SA
SGA2 SA V
SGA2 SA.S
SGA2 SA.S V
SGA2 P
SGA2 P V
SGA2 P.S
SGA2 P.S V
SGA2 M
SGA2 M V
1
1
1712
12
1271
6
1
7
4
11
11
11
2
22
22
3
3
8
6
6
6
9
9
9
10
10
1. Purge Valve
2. Process Gas Valve
3. Regulator
4. Regulator
5. Connection pig tails / flexible hose
6. Back pressure manometer gauge
7. Pre pressure manometer gauge
8. Active side switch
9. Block valve right
10. Block valve left
11. Safety relief valve
12. Outlet process gas
(Use of orifice (according to type of gas))
55

4
These devices are precision instruments of the highest qual-
ity. Through the use of selected materials, high surface qual-
ity and tightness it’s possible to control pressure and flow of
pures gases with consistent accuracy.
All steps – from conception, through production to final in-
spection – are subject to the strict criteria of our quality as-
surance according to DIN EN ISO 9001.
Each complete system and its individual parts are tested for
function and tested with helium for leak tightness, thus guar-
anteeing the well-known quality.
The warranty period of this fitting supplied by AIR LIQUIDE is
one year, including spare parts and repair, excluding postage
and packing costs.
Excluded from the warranty are gaskets, these parts are sub-
ject to natural wear.
No warranty is given for the following reasons:
• unsuitable and improper use
• improperly carried out repairs
• installation of non-original spare parts
• failure to follow these operating instructions.
For further information please refer to the General
Terms and Conditions of AIR LIQUIDE.
According to the legislator, the operator is responsible for the
safety and health of his employees. He is obliged to prepare
a risk analysis of his company. He must also provide employ-
ees with the necessary work equipment to prevent hazards
from arising. In addition, must regularly monitor and docu-
ment the safety-related systems document this.
This operating manual is intended to help that a small part
of these requirements can be met.
Our pressure control panels comply with the actual rules of
regulation and are design according to the state of the art.
Our “General Terms and Conditions of Sale and Terms of
Delivery” apply. These are available to the operator at the
latest upon conclusion of the contract. Warranty and liability
claims for personal injury and property damage are excluded
if they are attributable to one or more of the following causes:
• Improper use of the equipment.
• Improper installation, commissioning, operation and main-
tenance of the pressure and maintenance of the equip-
ment.
• Operation of the pressure equipment with defective safety
devices or improperly installed or or non-functioning safe-
ty and protective devices.
• Failure to observe the instructions in the operating manual
regarding transport, storage, assembly, commissioning,
operation, maintenance and set-up of the pressure equip-
ment.
• Unauthorized structural modifications to the pressure
equipment.
• Unauthorized alteration of the cylinder connections for the
use of other types of gas, exceeding the permissible inlet
pressure permissible inlet pressures, the use of foreign or
non-original seals.
• Inadequate monitoring of equipment, screwed connections
and sealing parts that are subject to wear.
• Improperly performed repairs.
• Exceeding or falling below the temperature range specified
in the data sheet during operation or during storage.
• Catastrophic events due to the effects of foreign bodies
and higher force majeure.
1 Preliminary notes
Warranty and liability

5
2.2 Type of Gas
Depending on the version of the manifold, for high purity
gases incl. 6.0. See gas compatibility table Chapter 10.
2.3 Devices for requiring acceptance
plants
Details of required test certificates or certificates for materi-
als, tightness, etc. must be known when the order is placed.
2.4 General conditions for operation,
transport and storage
Ambient temperatures: -20°C to 50°C
Transport and storage: -20°C to 55°C
Atmospheric conditions:
  rel.Humidity: 50 %at40°C
    90 %at20°C
Environment: ambient air free of unusual quantities of dust,
acids, corrosive gases or substances such as
smoke, steam, oil vapor, etc.
Note: Use of pressure control panels unprotected out-
doors will impair the quality of the gases and can en-
danger the functional safety.
Deviating conditions can be agreed between the manufac-
turer and user upon.
2.5 Connections
Input station:
More detailed information can be found in the corresponding
product data sheet.
Output Station:
More detailed information can be found in the corresponding
product data sheet.
Purge outlet:
More detailed information can be found in the corresponding
product data sheet.
2.6 Intended use
The pressure device is intended exclusively for the pressure
regulation of gaseous media from pressurized gas cylinders.
Any other use or use beyond this is considered to be not in
accordance with the intended use.
Intended use also includes
• observance of all instructions in the operating manual,
• observance of the inspection and maintenance work,
• observance of the type plate and the data sheet
2.1 Function
Pressure manifolds are used as central supply system for
technical and high-purity gases to supply one or more points
of use. The points of use are are supplied via a piping system
connected downstream the manifold.
Pressure control panels are available in various designs:
1. One-sided for connection of one or more cylinders.
These stations are used wherever a working process
can be interrupted due to a gas shortage or where the
gas consumption is so low that a cylinder change can
be calculated.
2. Manual changeover for connection of 2x1 or several
cylinders stored on two sides. The area of application
of this design is everywhere, where a process cannot be
interrupted due to a lack of gas, but a manual process
cannot be interrupted due to lack of gas, but a manual
changeoverispossible(e. g.duringnormalworking
hours).
3. Automatic changeover for connection of 2x1 or more
cylinders stored on two sides. If a working process runs
for a longer period of time and cannot be interrupted due
to lack of gas and a manual changeover is not possible
intermsoftime(e. g.outsideworkinghours,atnightor
at the weekend), then the use of these stations is re-
quired.
4. All pressure control panels can be supplied with pres-
sure transmitters. For flammable gases as Ex-version,
also for Ex-zone 1+2 applicable. The cylinder pressure
is measured in conjunction with a signal device which
indicates the level of ga in the cylinder. If the pressure
is below of a warning value, an alarm will be triggered.
5. Stations for oxygen, nitrous oxide and carbon dioxide
can be supplied with gas heaters.
6. If larger quantities of gas are required, it is of course
possible to luse cylinder bundles, which can be con-
nected via a high-pressure hose (please note the max.
flow rate of the station).
7. Pressure control panels can be extended as required by
retrofitting extension modules. The respective cylinder
pressure(max.200/300barat20 °C)isadjustedbythe
pressure regulator to the desired outlet pressure. The
exact parameters can be found from the data sheet or
product catalog.
8. A line shut-off valve should be installed in the pipeline
downstream of the battery pressure regulator. A protec-
tion against excess pressure of the main piping is man-
datory, here we recommend the installation of a suitable
safety valve. Options esspecially for the manifolds are
listed in the data sheet under “Options”.
2 Usage

6
2.7.5 FOOD regulation (EC) n°1935/2004
The AL equipment enhancing the term “FOOD” in their des-
ignation are specifically designed for use with food gases
used for food and beverage applications. They are compliant
withRegulationEC1935/2004whichrequiresthatpackaging
and articles intended to be in contact with foodstuffs are to
be manufactured in compliance with good manufacturing
practices and standard operating procedures.
Thus, under normal or foreseeable conditions of use, no
transferofcontaminants,e. g.metalelements,tofoodin
quantities that could endanger human health, modify food
composition or deteriorate organoleptic characteristics is
expected.
Nethertheless, the end-user must check the compliance with
an eventual national regulation.
Articles for food usage has a Food logo marking. For trace-
ability purposes, the batch number is written on each article
and AL can perform a batch recall, as requested by its Quality.
2.7.6 Cleaning
Each equipment is subject to a grease removal and a high
quality cleaning to preserve the purity of gas in the equipment
as well as for use with oxygen for compatible equipment. A
suitable packaging protects the equipment against exterior
pollutants during storage and transport.
Take care to avoid polluting the equipment during installa-
tion.
2.7.7 Testing
Prior to packing, each valve is checked for function and for
tightness.
2.7 Guidelines
2.7.1 Conformity
AIR LIQUIDE certifies that these equipment are in conformity
with the technical specifications of AIR LIQUIDE, which have
been manufactured, tested and inspected accordingly. The
manifolds are suitable for use with oxygen, provided that the
valve is specified for this purpose in chapter 10.
Please observe the relevant national and international laws,
regulations, directives,standards, technical rules as well as
the regulations and bulletins of employers’ liability insurance
association.
2.7.2 PED Directive 2014/68/EC:Pressurized equipment
TheAIRLIQUIDEfittingswithanominaldiameter< 25mm
(e. g.pressureregulators,valves,filters,etc.)meettherequire
mentsofArticle4,Paragraph3oftheDirective2014/68/EU
and the provisions of the article. Therefore these devices do
notbearaCEmarkingaccordingtoArticle18ofthisDirective.
2.7.3 ATEX Directive 2014/34/EC
The cylinder pressure regulators are not in the scope defined
in points a), b) et c) of the article of the ATEX Directive ; con-
sequently, they shall not bear the CE marking.
The regulators are not capable of causing an explosion
through their own potential sources of ignition: thus, they can
be installed in ATEX zone 1 or 2, provided that up to date
regulations, rules and operating instructions are observed
accordingly during installation and operation. Reminder: it is
the responsibility of the end user to define the ATEX zone.
2.7.4 REACH regulation (EC) n°1907/2006
The pressure reducers are made of brass parts, essentially
the body, which is a copper alloy with a lead content between
1 %and4 %w/w.Asrequestedbyart.33ofREACHRegulation
(Registration, Evaluation and Authorisation of Chemicals)
and with reference to current list of SVHC (substances of
very high concern) available on ECHA website, we inform that
leadmaybepresentinaconcentrationabove0,1 %inour
products made of brass.
Lead inclusion in the SVHC list in June 2018 does not modify
the use conditions described in operating instructions.
Lead will not be released to the surrounding environment or
the gas used during normal use. After product end of life, the
pressure reducers must be scrapped by an authorized metal
recycler.

7
3.5 General regulations and notes
The pressure control panels comply with the state of the art
and the recognized rules of technology. The devices have
been designed in accordance with the PED Article 4,
Paragraph 3, and are manufactured in accordance with good
engineering. Without the approval of the manufacturer no
modifications shall be made.
• Smokingorflames(e. g.candles)inthevicinityofyourgas
supply is strictly prohibited! Fire and explosion hazard!
• Donotuseinambienttemperaturesbelow 20 °Cand
above+ 50 °C,donotuseforgasesintheliquidphase.
• Use only for the marked pressures.
3.6 The resistance of the materials
The resistance of the materials is only ensured with dry gas
and dry flushed piping and fittings.Incorrect assembly, leak-
ing screw connections or improper purging can lead to a
limitation of the service life.
3.7 Purging – leakage of harmful gases
and vapors
When purging the system, care must be taken to ensure that
the gas can be discharged or disposal of the gas must be
ensured. This also applies to the outlet of the relief valve on
the pressure regulator.
When safety devices are open or in the event of a malfunction
harmful gases and vapors may escape. Ensure sufficient
ventilation or extraction.
3.8 Dangers due to pressure energy
Depressurize piping sections before starting repair work.
Check or even replace flexible hose at appropriate intervals,
even if no safety-relevant defects are apparent.
External influences such as high temperatures, heat radia-
tion, impact and the like, pressurized gas cylinders or pres-
surized system parts can become very hot or burst. Take
appropriate precautions and safety measures.
3.9 Special hazards due to leakage
Due to the use of very hazardous, hazardous or less hazard-
ous gases, leakages of equipment may result in danger to
life of the user.
Therefore, an operating instruction according to § 20
GefStoffV,anactualEUsafetydatasheetaccordingto§14
GefStoffV and a tremcard with instructions for the physician
in a suitable place.
Operators must be aware of the particular hazards of the gas
and of possible personal and other protective measures. be
pointed out.
3.1 The handling of gases
The handling of technical and high-purity gases, in particular
toxic (poisonous), flammable or fire-promoting gases, re-
quires expert knowledge, the observance of these operating
instructions and the existing regulations.
The training and regular safety instruction of the operating
personnel on how to handle this equipment, with toxic (poi-
sonous), flammable or fire-promoting gases and pressurized
gas containers is mandatory. In case of improper handling
and/or use of the equipment the equipment may result in
danger for the operating personnel and other persons as well
as damage to the system and the environment may occur.
These operating instructions must always be available to the
operating personnel at all times.
3.2 Gas-specific design
The manifold may only be used for the specified gas type
(see chapter 10). Alternating use for different gases and the
attachment of adapters to the cylinder connection is not per-
mitted. The selection of materials and gaskets is only related
to the respective specified gas type.
3.3 Duties of the operator
The operator is obligated to only allow persons to work on
the pressure device who
• are familiar with the basic regulations on work safety and
accident prevention and
• have permanent access to these regulations,
• have read and understood the safety chapter and the warn-
ing notes in this operating manual. These employees are
trained and instructed in order to be able to work on the
pressure control panels.
• The safety-conscious work of the personnel is checked at
regular intervals.
• The responsibilities of the personnel for assembly, com-
missioning and operating must be clearly defined.
• Personnel to be trained may only work on the pressure de-
vice under the supervision of an experienced supervisor.
• All safety and danger notices must always be kept in a
readable condition.
• The required personal protective gear must be provided by
the operator.
3.4 Duties of the personnel
All persons who are assigned to work on the pressure equip-
ment are obligated to read and understand the fundamental
safety and accident prevention regulations and to familiarize
themselves with the safety data sheet for the type of gas
used.
3 Safety instructions

8
4.1 Name plate
A name plate with following information is located on the
base plate of the manifold:
Manufacturer, date of manufacture, type designation, ap-
proved prepressure pressure (P1), unit-specific backpressure
or mean closing pressure (P2), maximum flow rate and part
number.
The serial number is printed as a device-specific identifier on
a separate label in barcode 128 and in plain text.
4.2 CE marking
Since the station has been designed according to “good en-
gineeringpractice”inaccordancewithArticle4,Para.3,the
station must not be CE marked. The marking of the manu-
facturer is affixed to the nameplate.
3.10 Dangers due to electrical energy
Work on electrical components, display and control units
(e. g.ALMS)mayonlybecarriedoutbyaqualifiedelectrician.
Check the electrical equipment of the plant regularly. Loose
connections and damaged cables must be immediately re-
paired or replaced.
The control cabinet or the electrical assemblies must always
be locked at all times. Access is only permitted to authorized
personnel with a key or tool.
If it is necessary to work on live parts, a second person must
be called to switch off the main switch if necessary.
3.11 Cleaning the gas appliances and
disposal of residues
Used equipment or equipment which is going through a main-
tenance check must be purged with inert gas (nitrogen, ar-
gon). Take care of solid gas residues in an appropriate man-
ner. In particular, do not contaminate with oily rags or lubri-
cants. Do not clean with solvents.
3.12 Notes on special types of gas
All parts that come into contact with oxygen must be kept
free of oil and grease. Only use lubricants with special oxygen
approval.
4 Marking

9
5 Flow scheme
SGA2 P
SGA2 P V
SGA2 P.S
SGA2 P.S V
SGA2 SA
SGA2 SA V
SGA2 SA.S
SGA2 SA.S V
SGA2 M
SGA2 M V

10
6.1.6 Check connection threads and connection surfaces
of the cylinder valves and the gaskets for proper con-
ditionandfit(seeFig.8.10 / 8.11).MountFlexible
hoses / pigtailswithhandconnection(Oringseal)
without tools on the cylinder valve. Before connecting
theflexiblehose / pigtail,brieflyopenthecylinder
valve once and then close it again, to blow out any dirt
particles that may be present. Do not stand in front of
the outlet opening of the of the valve (7) and make
sure that no danger arises from the escaping gas.
Good ventilation must be provided. Do not blow out
flammable, corrosive, toxic and irritant gases.
6.1.7 At the outlet of the pressure regulator (12), the orifice
plate included in the scope of delivery or optionally
supplied must be inserted or mounted, depending on
the type of gas.
Adapt the outlet to the pipeline by using a compres-
sion fitting. Shortly after the outlet of the pressure
regulator (12), a main line shut-off valve and, if neces-
sary, a safety valve should be installed in the pipeline.
6.1.8 When toxic or flammable gases are used, safe dis-
charge of the purge gas must be ensured. The exhaust
gas pipes must be connected to the outlet connection
of the blow-off valve on the pressure regulator (3 or 8)
and to the purging valves (1) by using compression
fittings.
6.1.9 After successful installation, the system must be purged
with dry inert gas of suitable quality (e.g. nitrogen). All
detachable connections must be leak tight. The tight-
ness test must be certified and checked repeatedly at
regular intervals.
6.1 Assembly
6.1.1 Assembly may only be carried out by persons who are
trained, experienced in the field of application (gas
installations) and have been instructed in safety tech-
nology. The trainings and instructions must be carried
out in regular intervals.
6.1.2 The pressure manifolds shall be supplied pre-assem-
bled as far as possible. Check scope of delivery in
accordance with the datasheet. Check on the basis of
the type plate whether the station is suitable for the
intended use (pressure, gas type, material).
6.1.3 Determine the dimensions of the drill holes according
to the data sheet and fasten the base plate with ap-
propriate screws.
6.1.4 The Cylinder brackets must be fixed on a Wall or similar.
The support must be sufficient to prevent the Cylinder
from falling down. When doing this the outer edges of
the base plate should be vertical and approx. 3/4 of
thecylinderheight(foracylinderheightof1500 mm,
thisisapprox.1100 mm)ashorizontalorientation.
6.1.5 Hose lines / spiral tubes (5) via adapter / check valve
or check valve with filter (antiflapping). First screw the
adapter / check valve into the station inlet first.
The tool must only be applied to the narrow hexagonal.
Then mount the hose line / spiral pipe on the check valve
while holding it against the fitting body with a second wrench.
6 Installation
O-Ring O-Ring
Abb. 8.10 300 bar Abb. 8.11 200 bar

11
7.2 Changeover and cylinder change
7.2.1 Close the cylinder valve of the emptied gas cylinder.
7.2.2 Close the service gas valve (2). For two-sided mani-
folds with manual changeover, simultaneously open
the service gas valve of the other side at the same
time.
For stations with semi-automatic changeover, turn the
handwheel of the changeover regulator (8) to the other
side. After that, close the service gas valve.
Now the arrow in the handwheel of the changeover
regulator (8) points to the side from which the gas is
to be tapped.
7.2.3 Open the purge valve (1) on the side where the change
of the cylinder needs to be performed (pressure re-
lief). Close the purge valve and loosen the cylinder
connection of the flexible hose / spiral tube (5) at the
corresponding cylinder valve and connect the new
cylinder (see also section 9.1 Commissioning).
7.2.4 Pressure build-up flushing as described in points 7.1.5
to 7.1.6 repeat at least 5 times.
7.2.5 Slowly open cylinder valve(s).
7.2.6 Slowly open service gas valve (2). For manifolds with
manual changeover, open only the service gas valve
(2) of the side that is to go into operation, keep the
other side closed.
7.2.7 After the cylinder has been changed, the cylinder con-
nections and the detachable connections must be
checked for leak tightness.
7.3 Decommissioning
7.3.1 Close all valves (including cylinder valves).
7.3.2 Open and close purge valve(s) (1).
7.3.3 Depressurize battery pressure regulator (3) completely
by removing gas from the end user so that the system
is completely depressurized (upstream and down-
stream pressure gauges show 0 bar).
7.3.4 Unscrew the adjusting handle of the pressure regula-
tor (3).
7.1 Commissioning
7.1.1 The manifold has been mounted according to chapter
6 and checked for possible leakages. The piping sys-
tem mounted behind the manifold is filled with inert
gas of the appropriate gas quality clean and dry and
checked for any leakages.
7.1.2 Close all shut-off valves (1+2) and line valve (option).
Unscrew the adjusting handle of the pressure regula-
tor (3).The regulator spring is relaxed (not with semi-
automatic versions).
7.1.3 Place full cylinders in front of the cylinder bracket and
secure it with the strap or chain against falling over.
Remove the protective cap of the cylinder. Check the
valve thread, connection surface and seals. Check
that flexible hoses and pigtails (5) are not damaged.
Replace damaged or worn seals. Only connect cylin-
ders with the same permissible filling pressures (ap-
plies only to manifolds with multiple cylinders).
7.1.4 Screwtheunionnutoftheflexiblehose / pigtail(5)by
hand to the sampling valve of the cylinder.
7.1.5 Slowly open the cylinder valve and close it again (in
the case of multiple cylinders manifolds, open and
close all bottle valves). Check connection at the cylin-
der valve for tightness.
7.1.6 Slowly open and close purge valve (1) (for two-sided
stations, open and close purging valves on both
sides).
Repeat procedure 7.1.5 to 7.1.6 at least 5 times.
7.1.7 Slowly open cylinder valve(s).
7.1.8 Slowly open the service gas valve (2). For manifolds
with manual changeover only the service gas valve (2)
of the side that is to go into operation, keep the other
side closed.
For stations with semi-automatic changeover the ar-
row in the handwheel of the changeover controller (8)
points to the side from which the sample is to be
taken.
7.1.9 Set the pressure regulator (3) to the desired outlet
pressure by turning the handle clockwise until the de-
sired outlet pressure can be seen on the pressure
gauge (7) (not applicable for SA/SA.S version). If nec-
essary, open the main shut-off valve of the piping sys-
tem (option) slowly so that the pressure in the down-
stream line builds up slowly.
7.1.10 Consumers can now be opened. Check pressure at
pressure regulator (7) and readjust if necessary.
7 Operation

12
8.2 Notes on pressure transmitter
or cylinder scale
The cylinder pressure at which a gas shortage signal is to be
issued can be set on the monitoring system.
For pressure control panels with automatic switchover,
the switching point for the gas shortage signal must
be higher than the changeover pressure of the mani-
fold, otherwise no no signal is given.
The electrical connection of the pressure transmitters or the
cylinder scales and the monitoring system may only be done
by respecting the operating instructions.
Further information on this can be found in the operating
instructions for the ALMS or ALMS Libra.
8.1 General operation of the gas shortage
warning device
The monitoring system consists of the pressure transducers
or a scales (ALMS Libra), the ALMS and the electrical signal
cables, for combustible gases as a blue cable in intrinsically
safe design.
The gas shortage warning is used to signal the emptying of
cylinders and to inform the operating personnel of the im-
pending changeover. This is done by means of an acoustic
signal (buzzer) and an optical signal (light emitting diode) on
the signaling device.
In the case of signaling devices that are connected to pres-
sure pressure transmitters, the current content (pressure) is
also directly displayed. These devices also have a second
pre-alarm.
The acoustic message (buzzer) can be acknowledged on the
signal device. However, the “Gas low” LED does not go out
until a full cylinder is connected.
The signal unit and the isolating switch must always
be outside the hazardous areas.
The adapter(s) for the pressure transmitter can be mounted
on the pressure manifold in different places. locations, de-
pending on the design of the pressure control panel.
An example is shown in the graphic below.
8 Operation of the gas shortage warning device
G 1/4"
Innen G 1/4" Innen

13
9.1 Troubleshooting
Fault Cause Troubleshooting
Assembly not possible Impossible assembly of the connections Verify the compatibility with gases, inlet and
outlet
Dammaged connection Change the connection
Insufficient output of gas
Cross section passage limited by a valve. Open the valve
Insufficient filled or empty cylinder Change the cylinder
Not operating valve Change the cylinder
Under-dimensioned equipment Contact AIR LIQUIDE
Equipment in output not operational Change the equipment
The gas source in
reserve drains without
being used (Change
over only)
Occasional over consumption Replace by an equipment with a lower output
Leakage Check out the gas tightness
Leakage at the main valve of the regulator Replace the main valve or the regulator
At the same pressure and
output entry, the outlet
pressure is not the same
which side you are using
Disturb regulators Adjust the regulators
Gas comes out of the
relief valve
Leakage at the flap of the regulator Replace the regulator
Defect relief valve Replace the relief valve
Frosting
Too low working pressure Close the cylinder valve. Increase the temper-
ature of the equipment above 0 °C
The used gas is argon (Ar), carbon dioxide
(CO2) or nitrous oxide (N2O) Mount an heater at the inlet
The outlet pressure
decreases Output flow too high Respect the regulator flow. Limit the flow by
using a valve or a calibrated orifice.
Vibrations
Output flow too high
Presence of a valve with rapid opening on the
outlet pipe.
Limit the flow by using a valve or a calibrated
orifice.
In case of malfunctions such as:
• Increase in back pressure without removal,
• leakages of the manifold or the outlet valves,
• visible damage,
• response of the relief valve on the pressure regulator,
• response of a safety valve,
the system must be taken out of operation immediately in
accordance with chapter 7.3 and a service technician must
be informed.
9 Instructions for operation and maintenance

14
9.2 Maintenance
Even though the equipment is reliable, it must be checked
periodically.
Since this task requires some precautions, it must be done
exclusively by a qualified technician.
The periodicity of this verification depends essentially on the
usage of the equipment (intensive, moderate, occasional).
We suggest the use of the following table to ensure an opti-
mum usage of your equipment:
V – to verify
C– to change
Periodically
Annually
Every 5 years
Leakage
Operation
condition of
threads
Sealing of
closure
Fastening
Appearance
Setting
Safety
Cleanliness
Labelling
Seal
Setting
Filter
Electrical
continuity
Cylinder/Manifold
connection
Flexible hoses /Pigtails V V V V V V C V C
Safety cable V V C
Racks V V
Chain V V
Fittings / Filters V V V V C
Manifold
Support plate V V V V V
HP Valves V V V
Regulators V V V V V V
LP Valves V V V
Relief valves V V C
Pressure Gauges V V V
Filters C
Others
2nd Stage reducer V V V C V C
Monitoring system V V V
Pipe network V V V V V V C V
The system should be checked by the manufacturer once a
year for functional and operational safety. We recommend a
maintenance contract – please do not hesitate to contact us.
The annual check of the flame back arrestors at downstream
point of us is required by law. The proof of this must be pro-
vided by the operator.
Flexible hoses must be checked as required, at least at inter-
vals within one year, in terms of their condition (integrity and
tightness) by an expert or by the manufacturer.

15
9.3 Repairs
For safety reasons, repairs may only be carried out in author-
ized workshops or by the manufacturer.
Only original spare parts shall be used.
After each repair, the manifold must be checked for function
and tightness. When putting the station back into operation
thefirstthingtodoistopurgethestationwithinertgas(e. g.
nitrogen).
In the event of improper repairs by unauthorized workshops,
modifications to the station or the use of non-original parts
immediately voids all liability and warranty of the manufac-
turer.
For further information please contact our personal at your
disposal.
9.4 Disposal and recycling
At the end of the equipment’s useful life or when it is impos-
sible to repair it, it is essential to respect the local regulations
forrecycling / disposalofourequipment.Topreventreuse,
these products must be unsuitable for use.
In accordance with EU Directive 2018/851 on waste, the
owner of the equipment ensures that when recovery is not
carriedoutinaccordancewitharticle10,thewastewillbe
subjected to safe disposal operations that comply with the
provisionsofarticle13ontheprotectionofhumanhealth
and the environment.
The licensee must take steps to promote high quality recy-
cling and, to this end, must establish separate waste collec-
tions when technically, environmentally and economically
feasible and adequate to meet the quality standards required
by the relevant recycling sectors.

16
10 Gas compatibility
Equipment Parameters Main gases
Item number
Adjustable
Back pressures / reserve
(bar)
Nominal flow rate
Nitrogen Nm3/h
Calibration of
relief valve (bar)
Inert gases
Argon-CO2-mixture
Carbon dioxide
Carbon monoxide
Breathable air
Synth. air
Oxygen
Nitrous oxide
Hydrogen
Acetylen
Propane
Propylene
Ethylene
Methane
Ammonia
SGA2-Stations brass chrome-plated SGA2 P 300-15-25 200972 2 - 15 25 21 300 50 300 300 SGA2 P V 300-15-25 154661 2 - 15 25 21 300 300 300 300 10 10 70 200 SGA2 P 300-50-100 154662 5 - 50 100 70 300 300 50 300 300 300 SGA2 M 300-15-25 154663 2 - 15 25 21 300 300 50 300 300 44 300 SGA2 M V 300-15-25 200973 2 - 15 25 21 300 300 300 10 10 70 200 SGA2 SA 300-12-15 173230 10,5 / 13,5 15 21 300 300 50 300 300 44 300 SGA2 SA V 300-12-15 173231 10,5 / 13,5 15 21 300 300 300 300 10 10 70 200 SGA2 SA 300-50-100 154656 41 / 50 100 70 300 300 50 300 300 SGA2-Stations steel SGA2 P.S 30-3-5 154660 0,5 - 3 5 4,2 6 SGA2 P.S 300-3-5 154657 0,5 - 3 5 6 300 300 50 200 300 300 SGA2 P.S V 300-15-25 154658 2 - 15 25 21 300 300 300 10 10 70 200 SGA2 P.S 300-25-40 154659 3 - 25 40 38 300 300 50 200 300 300 SGA2 SA.S V 300-10-15 154652 9 / 12 15 17 300 300 300 10 10 70 200 SGA2 SA.S 300-25-40 154653 23 / 28 40 38 300 300 50 200 300 300

17

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Air Liquide is present in 75 countries with approximately 66,400 employees
and serves more than 3.8 million customers and patients.
www.airliquide.de
Rev. 2.4 / 2023 / ce · OP 350 · Subject to technical modifications, all data supplied without liability.
Contact
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[e-mail]
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