• Hydrogen compatible gas seals are mechanical, contact free, gas lubricated, face seals consisting of a rotating ring and a primary ring assembly. They are specifically manufactured to tolerate the injection of liquefied Hydrogen. Hydrogen compatible gas seals are mainly used in radial compressors for gas pipelines, oil refineries, gas turbines, and ammonia plants. They are used in all pipeline and plumbing systems which are exposed to hydrogen or liquefied hydrocarbon gases.
  
  

Double Seals

• A double seal is normally used when the processed gas is abrasive, as is hydrogen, or when vacuum formation in the seal chamber is possible. An inert gas like nitrogen is used as a buffer to pressurize the seal chamber, eliminating any chance of vacuum formation.
  
  

Tandem Seals

• Tandem Seals are the most widely used seals in the petrochemical industry today. They are typically used in very high pressure scenarios in the presence of highly abrasive gases like hydrogen. In a tandem seal, the inner seal is used to handle the pressure arising from the machine, while the outer seal acts as a back-up.
  
  

Buffered Tandem Seals

• When a tandem seal contains an intermediate seal, the outer seal is buffered with an inert gas like nitrogen which can be safely released into the atmosphere if the seal fails.