A Vapor Recovery Unit (VRU) is a specialized compression package, which aims to lower emissions levels, while recovering valuable hydrocarbons to be sold or reused as fuel onsite. A package for vapor recovery can capture about 95% of Btu-rich vapors, generating many benefits, guaranteeing less air pollution, and recovering vapors to be used as fuel.
Garo is specialized in designing and engineering tank Vapor Recovery Systems, using liquid ring compressors as the means of compression.
When crude oil is stored in storage tanks, the vapor space above the liquid will become saturated with VOCs to reach equilibrium. Changing liquid levels due to loading and unloading of the tank will cause changes in the vapor space. As the tank is unloaded (drained) vapor must be added into the tank above the liquid to maintain a slightly positive pressure inside the tank to keep it from collapsing as the liquid is evacuated. As the tank is loaded (filled) the vapor above the liquid must be removed to keep the tank from over pressuring and potentially rupturing. Ambient temperature changes can also change the vapor pressure inside the tank above the liquid and can lead to venting of the VOC saturated vapor or to air ingress into the tank forming a potentially explosive atmosphere inside the tank. The VOC containing vapor that is vented through boil-off (hot ambient days) or through loading operations can be recovered and compressed, instead of being released into the atmosphere.
GARO Single-Stage Liquid Ring Compressor
GARO Two-Stage Liquid Ring Compressor