News 09/21/2022Good to KNOW: which seals are suitable for use in hydrogen applications? 

In addition to pressure and temperature, the permeation and diffusion of hydrogen through the seal material plays a decisive role.  

Another important aspect becomes apparent in elastomer seals at higher pressures (>30 bar) and a rapidly occurring pressure relief. Due to its very small molecular size, the H2 gas accumulates in the tiny cavities of the seal. In case of a sudden pressure release in the system to be sealed, the H2 gas also relaxes in the cavities inside the seal and the gas cannot escape as quickly.  

The result -> explosive decompression  

• The seal bursts or is even destroyed   
• The effect of the seal is lost  

A sudden pressure release is unavoidable in many cases. Therefore, the seals must be specially tested for this event.    

Recognizable by one of the following characteristics:   

• NORSOK Standard M-710 tested   
• AED = Anti-Explosive Decompression   
• RGD = Rapid Gas Decompression  

Sound technical advice is essential in any case. The technical experts at GOETZE will only be too pleased to help you.