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Gas recovery unit - Helium-Recovery Unit - HRU
Helium Recovery Units - The perfect technology for reducing helium costsThe recovery of used helium is particularly useful for meeting the environmental certification requirements under DIN EN ISO 14001 and for saving resources. The units are designed as stand-alone systems and can recover helium test gas regardless of the leak detection system manufacturer. Depending on the process parameters, up to 98 % of the inert gas can be recovered with helium concentrations between 10 % and 95 %. The recovery percentage depends on the type and version of the helium recovery unit, on the parameter settings and the helium density in the connected detection systems.
The maximum possible working pressures in the systems can be either 10 bar, 35 bar, 55 bar or 200 bar. The maximum helium flow is between 170 and 550 standard liters per minute depending on the system version and pressure level. In general, two possible Pfeiffer Vacuum helium recovery systems are available: The balloon recovery and the tank recovery. They are based on the formula p V = constant.
* In balloon recovery, the helium is collected in a balloon which inflates when being filled. In this principle, the storage in the balloon is realized by the volume. The pressure within the balloon remains constant under atmospheric conditions.
* The tank recovery has the helium pre-compressed in a pressure tank at a constant volume, while the pressure constantly increases. In addition, special customized, alternative solutions can be provided upon request.