Challenge A Gulf Coast Refinery scheduled turnaround required taking the Mid Crude and West LEU process units out of service. To achieve this, the units needed to be depressurized and decontaminated of LEL and H2S. Solution Envent supplied two temporary degassing and vapor control systems to safely and efficiently combust VOCs from the two […]
Challenge During a scheduled refinery turnaround, a customer needed to safely degas their Selective Hydrocracking Unit to perform critical maintenance. The unit would undergo hot hydrogen stripping to purge residual hydrocarbons, but strict emission control limitations at the facility’s flare stack required an alternative vapor control system for handling high volumes of hydrogen and nitrogen […]
Challenge The customer needed to clear their hydrotreater of volatile vapors and product in order to allow manned entry for maintenance activities. During this process, there would be limited availability to use the flare or FGRU to purge vapors from the unit. Additionally, there were high concentrations of hydrogen gas and H2S that needed to […]
Challenge A major Houston refinery engaged Envent Corporation in a competitive bidding process alongside several thermal oxidizer companies to support the cleaning and degassing of an underground API separator. This rectangular tank with an external-floating roof had accumulated years of wastewater hydrocarbons from multiple refinery operations—resulting in a potentially hazardous, unidentified mix of vapors and […]
Challenge A Gulf Coast refinery encountered an emergency shutdown on one of its reactors due to spent catalyst, requiring immediate replacement. The replacement had to be completed quickly to avoid delaying the startup of the refinery’s alkylation unit. The cleaning and neutralization process required three distinct phases and involved a complex atmosphere of: Pressures exceeding […]
Challenge A large gulf coast refinery was planning major equipment turnaround on multiple process units. While defining the scope of the work, they estimated that their Flare Header would quickly reach maximum capacity with vent gas from the process unit depressure and decontamination steps. The environmental department required the project to limit all emissions to […]
Challenge A major oil and gas refinery in Louisiana was fast approaching on a major turnaround where the coker flare and adjacent unit would need to be taken down for maintenance. The adjacent unit was home to the flare scrubber where all daily vents from multiple units, such as the Coker, Diesel Hydrotreater, Sulfur Plant, […]
Challenge A client asked Envent to help them to do the vapor control on the fuel gas recovery line at their refinery during their hydrogen plant turnaround event. As the hydrogen plant was being taken offline, the refinery fuel gas consumption would decrease, causing an excess of fuel gas. The excess capacity of the […]
Challenge Envent was challenged with depressurizing a propane line, within the confines of a gulf coast refinery. The line measured over 2 miles, was above 200 psig, and was full of liquid propane gas. Envent needed to ensure the pipeline was cleared and ready for Hotwork within a 2 day time frame due to inclement […]
An 80,000 bbl. /day crude distillation unit underwent a month long planned shutdown in order to perform maintenance on their exchangers, and pressure vessels.
A Mid-West refinery was preparing for an internal pipeline maintenance project and was exploring options for how to take the vent and a refined product pipeline out of service to sustain refinery production and continue to ship refined project to market…
A Midwest refinery contracted Envent to provide degassing and vapor control services. The refinery planned a major turnaround and had multiple critical-path process units that needed industrial degassing and industrial vapor control services for safe entry into process vessels.
