Adequate Design Evaluation for Vapor Collection & Control Systems

SLR’s proprietary Excel-based transient model is capable of predicting and trending tank system pressure over time to determine if pressure relief set points will be exceeded.

Peak vapor flow conditions occurring during treater or separator liquid dumps to atmospheric storage tank batteries can overwhelm inadequately designed or sized vapor collection and control systems, resulting in venting from thief hatches and/or pressure relief devices (PRDs). An “adequate design standard” has emerged as a consequence of recent Environmental Protection Agency (EPA) and state agency civil enforcement actions. Recently finalized New Source Performance Standards (NSPS) OOOOa requires a “sufficient design and capacity” assessment and certification of new tanks by a qualified professional engineer.

Using our proprietary Excel-based transient model, SLR can assess existing production tank battery vapor collection and control systems to determine if such systems can accommodate peak vapor flow conditions. SLR’s transient model is capable of predicting and trending tank system pressure over time to determine if pressure relief set points will be exceeded. The model accounts for the dynamic and intermittent nature of tank system operation and accumulation (surge capacity) within the tank vapor space.