O2 Cylinder/Oxygen Bottle Testing, Recertification & Filling

Extend your aero oxygen bottle’s lifespan with complete aircraft oxygen servicing.

The next time you need to test or refill your aircraft oxygen bottle, send it to the industry’s most trusted source.

We are the exclusive factory authorized overhaul and certification facility for Ontic Engineering’s Kidde Oxygen bottles and components throughout North and South America. We are also proud to service O2 cylinders and components from B/E Aerospace, Zodiac, Textron and other top manufacturers. For specific part numbers and OEMs, visit our Component Capabilities page.

Part Repair

Aircraft Oxygen Cylinder Hydrostatic Testing & Recertification

GlobalParts is DOT certified for hydrostatic testing of O2 cylinders.

Most oxygen cylinders must be tested and recertified every 5 years to make sure they can safely contain maximum fill pressure. Over time, cylinder vessels can deteriorate and weaken, making them susceptible to failure. With air pressures as high as 2250 psig, a failure can cause catastrophic damage to the aircraft and the people inside it.

Oxygen cylinder testing and recertification is not only only legally required, but it provides peace of mind. The vessel (O2 cylinder or bottle) is inspected for corrosion and damage, and the life limit checked. The recertification process also includes hydrostatic testing to determine the strength and integrity of the vessel.

What is aircraft oxygen bottle hydrostatic testing?

Hydrostatic testing obtains two measurements that relate to vessel integrity:

  •  Elastic expansion—the expansion which occurs when the bottle is under the maximum test pressure (how far the vessel expands under pressure)
  •  Permanent expansion—the expansion which remains after the pressure has been relieved (the “relaxed” state of the vessel)

These measurements must fall within a specified range. For example, if the elastic expansion is above the limit (the vessel expands too much under pressure), this results in a test failure and the oxygen cylinder or bottle is deemed unsafe for use. It isn’t structurally sound enough to withstand high pressure.

Who regulates hydrostatic testing for aircraft oxygen bottles and cylinders?

Oxygen cylinders and bottles used in aircraft may require hydrostatic testing per FAR regulations, but the DOT and Compressed Gas Association actually govern the specific requirements, test methods, and certifications for testing facilities.
GlobalParts is DOT certified for hydrostatic testing and meets all regulatory requirements.

How is the hydrostatic test performed?

The most common method is a water jacket volumetric expansion test, also called a hydraulic proof pressure test.

  1. The vessel (O2 cylinder or bottle) is filled with water and placed within a water jacket.
  2. The vessel is then pressurized with water to the rated test pressure.
  3. As the vessel expands under the pressure, it displaces water from the jacket. The volume of this displaced water is measured and used to determine the elastic expansion.
  4. Once the pressure is released and the vessel contracts, the previously displaced water is drawn back into the jacket. This measurement is also taken and used to determine the permanent expansion.

This is a reliable way to test oxygen bottles and cylinders safely. If the vessel does fail during the test, there is not the same risk of injury as a failure in the air. The water jacket simply expels the excess water.

Aircraft Oxygen Bottle Filling

We’re happy to provide a reliable and affordable source for aviation oxygen bottle refilling. If you’ve struggled to procure aero oxygen in your area, your local shop doesn’t have the right equipment, or you’re tired or seeing the prices rise as the number of suppliers dwindle, let us get you taken care of. With our quick turnarounds, we’ll have your O2 cylinder refilled so you can get back to high flying fast.