Vapour recovery units (VRUs) have become essential equipment for upstream oil and gas producers operating under EPA's OOOOb regulations. As enforcement timelines advance and inspection requirements tighten, operators need to understand both the technical and regulatory dimensions of VRU deployment. What OOOOb Requires for Storage Tank Vapours EPA's OOOOb rule establishes emission limits for storage vessels, pneumatic controllers, and other components at well sites and compressor stations. For storage vessels above threshold emission levels, operators must reduce VOC emissions by 95% — typically achieved through a vapour recovery unit or combustion device. VRU Technology and Integration A vapour recovery unit...