Skip to main content

Maintenance & repair

For optimum performances, all installations require regular maintenance. Air Liquide offers support with the maintenance of your installations.

  • Preventive maintenance
  • Curative maintenance
  • Troubleshooting and repair

For the fields of activity:

  • Biogas and Bio-LNG
  • LNG liquefaction for maritime activities
  • Helium and Hydrogen Cryogenics for scientific and industrial markets
  • Hydrogen distribution for mobility
  • Aeronautics and Defense

Preventive maintenance allows you to detect any possible faults and correct them before they affect the proper operation of your system. Preventive maintenance guarantees maximum technical availability and lifespan, thereby reducing your budget.


Liquefiers, refrigerators, and purifiers. We offer maintenance on a variety of equipment such as compressors, deoiling modules, cold boxes, pumping systems, as well as measurement and analysis devices.

  • Leak tightness tests
  • Re-calibration of measurement devices (detectors and sensors)
  • Re-sizing of valves in accordance with the regulations in force
  • Replacement of wearing parts
  • Verification of safety systems
  • Cleaning of filters and replacement if necessary
  • Maintenance of the compression system
  • Inspection of all the unit's equipment and components
  • Replacement and regeneration of activated charcoal in the oil removing system


A specialized preventive and curative service for all on-board and ground-based gas production equipment (nitrogen and oxygen). We also offer the repair, maintenance, and reconditioning of your breathing apparatus.


We offer a variety of different preventive and curative maintenance services for Air Liquide equipment installed on military and civil aircraft for the physiological protection of the pilot (oxygen needs and g-force resistance), as well as inerting of fuel tanks. This maintenance concerns:

The OBOGS: The "On-Board Oxygen Generating System", including its various components: concentrator, regulator, oxygen monitor, back-up oxygen source, battery casing, seat-aircraft connection, etc.

The OBIGGS: The "On-Board Inert Gas Generating System", including its various components: membrane, control panel, oxygen monitor, etc.


We carry out a variety of preventive and curative maintenance services for Air Liquide equipment, for aircraft support and operation.

This maintenance concerns:

The Mobile Gaseous Nitrogen Generator (GMAG), which produces aircraft-grade nitrogen for the maintenance of various actuating cylinders (for landing gear, flaps, etc.), inflating tires and, pressurization and inerting of engine containers.

The various aero-transportable O2 tanks dedicated to storing and distributing liquid oxygen.

The Gaseous Pressured Vaporization Unit (GPV) used for filling on-board oxygen bottles (ejector seat bottles for fighter planes and emergency bottles for passenger aircraft in the event of depressurization or smoke in the cabin).


We provide a wide range of services for the repair, maintenance and restoring of protective breathing equipment to a state of operational readiness (PBE 15-40F-80 and Oxalair smoke hoods), and for the maintenance and upgrade of on-board liquid oxygen tanks (Inalox).

These services have been awarded the EASA Part 145 maintenance approval, and are therefore recognized by the European Aviation Safety Agency in compliance with the ongoing regulation.


Air Liquide Cryogenic Services

Tel.: +33 (0)

Send an email 

Aerospace support

Ground and on-board equipment support:

Baptiste CALLIER

Tel.: +33 (0)4 76 43 66 43 

Spare parts support:

Christian BOS

Tel.: +33 (0)4 76 43 64 68 

Respiratory equipment support:

Valérie CHAISSE 

Tel.: +33 (0)4 76 43 63 14