Vapour Recovery Units and OOOOb Compliance: Engineering Solutions for Oil and Gas Operators
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 captures low-pressure vapours from storage tank vents, compresses them, and routes the recovered gas into a sales line or facility fuel system. The captured vapours have BTU value — meaning a VRU does not just reduce emissions, it generates a revenue stream. When VRU capacity is exceeded, overflow typically routes to a flare system (heroprocesssolutions.com/flares/) or enclosed combustor as a secondary control device.
Selecting the Right Configuration
VRU sizing depends on storage throughput, vapour pressure of the produced crude, and ambient temperature ranges. Under-sized units fail to capture peak vapour loads. A proper engineering evaluation should model vapour generation across seasonal temperature extremes before specifying compressor size and inlet pressure rating.
Backup Combustion and Compliance Continuity
Regulatory compliance requires that tank vapours are controlled continuously — including during VRU maintenance windows. Best practice is to install a small enclosed combustor or flare as a backup control device that activates automatically when the VRU goes offline, protecting operators from permit exceedances during planned and unplanned downtime.
Roderick Smith is a writer, blogger, and business owner. He has been writing for over 5 years and his blog naouelmoha.net offers valuable information about the business, health, law, and the latest technology. Roderick lives in Nashville with his wife and three children.
