Cryospain is proud of the broad range of technical engineering services we offer. Key among these is cryogenic filling station maintenance. We’d like you to see with your own eyes how we approach a job like this. In this video, you can see how we went about the maintenance of a medical oxygen station in Madrid, the home of Cryospain.

Rules and regulations

When customers trust us with testing their cryogenic filling station, that’s a huge responsibility. So first things first, we always check we are adhering to every current regulation.

For these jobs, we need to ensure we meet the standards on pressure equipment set out in Royal Decree 2060/2080. We also have to get approval from the Directorate General of Industry, Energy and Mines. This allows us to carry out the pressure test with liquid oxygen from the station itself. There’s a very good reason for this.

Understanding the risks…

Inside the cryogenic filling station, liquid oxygen is circulating at -186ºC. As a result, any trace of humidity caught in these temperatures would immediately freeze.

The potential implications in practical terms?


Solidified elements could damage any control or safety equipment within the cryogenic filling station. If we carried out the tests using water, drying the pipes would be a painstaking task. It would also be many hours until the product’s purity levels were back to normal.

…and eliminating them

Our operations technicians know the drill:

Firstly, they isolate each section of the circuit they need to test. This involves installing a safety valve set to 1.05 times the test pressure. Secondly, they inspect the joints, the welds and every accessory. This is the only way they can be 100% sure the circuit is watertight.

Once they’re satisfied with what they see, they can begin the test.


Our technicians introduce oxygen into the cryogenic filling station circuit. Then they gradually increase the pressure. They work to intervals, allowing the system pressure to stabilise.

Once they’ve reached test pressure, they maintain it for 30 minutes. This is to check that there are no deformations in the pipes and that gauge pressure doesn’t fall.

When the time is up, they reduce pressure again. They then run a final facility-wide check for deformations. If everything’s as it should be, the test has been a success.

Above and beyond

Our technicians and engineers are all qualified to carry out ITC EP-4 and ITC EP-6 inspections. In other words, your cryogenic filling station is in good hands.

Cryospain is committed to the maintenance of your cryogenic equipment and facilities. We apply our sector’s most cutting-edge testing techniques to the tools of your trade. And we go above and beyond to more than meet all current regulations, both legal and technical.

Guaranteed results. Total peace of mind.

So why not contact us today?

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