Refinery Vapor Control & Turnaround Emissions Management
North America’s Trusted Partner for Refinery Vapor Control & Turnaround Emissions Management
Time is money during a refinery shutdown, and when every hour counts, you need a partner who can deliver precision, speed, and regulatory certainty. That’s why companies call Envent Corporation for complete refinery turnaround services, from vapor control through water treatment, during these critical windows.
We provide custom-engineered solutions, including flareless options, integration with Flare Gas Recovery Units (FGRUs), and proven emissions-control technologies that keep your plant compliant and operational.
Why There Is a Critical Need for Specialized Turnaround Support ?
Envent understands that even the most carefully planned turnaround or MSS (Maintenance, Startup, Shutdown) event can face unexpected challenges that put compliance, safety, and schedules at risk.
Our Priorities are Simple
- Protect Your People
Making sure high-risk, time-critical refinery operations are safe. - Maintain Compliance
Adhering to strict EPA and ECCC reporting requirements. - Minimize Downtime
Every hour of downtime impacts profitability; our rapid response keeps your turnaround moving.
Why Choose Envent for Refinery Turnaround & Shutdown Support ?
With 30+ years of field experience, Envent is North America’s most trusted partner for refinery vapor control and turnaround emissions management.
Our Two-Goal Approach
- Keep Your Project on Schedule
Every hour of downtime impacts profitability. Our rapid response, detailed planning, and experienced operators keep your turnaround moving safely and efficiently. - Ensure Full Regulatory and Safety Compliance
From pre-start engineering through execution, Envent partners with your team to control emissions, verify results, and maintain transparency with regulators.
End‑to‑End Turnaround Support
Drawing on best practices from leading refinery emissions programs, Envent’s turnaround services include:
- Custom-Engineered Solutions
These include flareless options, integration with Flare Gas Recovery Units (FGRUs), and proven emissions,control technologies that keep your plant compliant and operational. - Full-Range Vapor Destruction
We manage hydrocarbon, hydrogen-rich, H₂S, nitrogen purge, and steam-assisted vapor streams during turnarounds, applying thermal oxidation or scrubbing as appropriate to the vapor composition. - Flare Minimization Strategies
Using strategies that reduce emissions, maintain compliance, and maintain good community relations. - Rapid-Deployment Systems
Thermal oxidizers and vapor control systems for de-inventory and degassing phases. - Custom Scrubber Systems
Dedicated systems for handling ammonia, hydrogen sulfide, and odor control. - Water Treatment Support
Effluent management during unit preparation, chemical cleaning, or maintenance cycles. - Certified Documentation
Data and compliance documentation to satisfy EPA and ECCC reporting requirements.
Proven Safety on Every Project
Everyone talks about safety, but few can back it up. Envent Corporation does, and our TRIR (Total Recordable Incident Rate) of 0.0 proves it.
Because we design, engineer, and build our own equipment, we understand every system from the inside out. That depth of knowledge allows our teams to work safely and confidently in even the most demanding refinery maintenance and industrial environments.
Safety isn’t just a policy at Envent; it’s a safety culture of constant improvement and accountability. We build new systems when a project needs them, so every client gets the latest safety safeguards available.
Our latest example is the Envent Turnaround Safety Skid. Engineered with built-in redundancy, reliability, and automatic isolation, it protects both the refinery and Envent’s equipment during an unexpected process upset.
This field-tested system provides an extra layer of protection that keeps people, property, and operations safe. At Envent, zero incidents isn’t just a goal, it’s the industry standard.
TIME IS MONEY— PETROLEUM REFINERY SECTOR STANDARDS (NESHAP)
When the Petroleum Refinery Sector Rule (40 CFR Part 63, Subpart CC) limits the use of your flares during a refinery turnaround, every hour of delay impacts your schedule and your bottom line.
The Envent Advantage for MSS Compliance
No Permanent Flare Limitations. We do not have to adhere to permanent flare limitations.
- Reduced Monitoring Burden
Unlike traditional flare systems, we are not required to maintain CEMS (Continuous Emissions Monitoring Systems) or a minimum BTU content going into our burner. - High-Flow Purging
This allows us to purge through much higher nitrogen and hydrogen flow rates during vessel purging following steam or chemical cleaning. - Improved Efficiency
Our process improves operational efficiency and shortens turnaround time by preventing extended depressurization and decontamination stalls.
Industry-Leading Mobile Vapor Destruction- That’s where Envent Corporation delivers a critical advantage. We own and operate the largest fleet of mobile thermal oxidizers in the United States, including the EMECS 77, the industry’s most powerful mobile unit, capable of handling 34,000 SCFM and 77 MMBTU/hr.
Compliance and Execution
- Dramatically Shorter Timeline
By deploying the right oxidizer capacity for each project, Envent greatly reduces depressurization time. - Guaranteed Destruction
Our systems make sure total vapor destruction is achieved. depressurization time. - 100% Regulatory Alignment
We maintain total compliance with all EPA and ECCC requirements.
At Envent, Petroleum refinery sector standards (NESHAP) compliance isn’t a constraint, it’s our competitive edge.
Featured case study
The Problem: A Houston refinery needed to degas its Fluid Catalytic Cracking Unit (FCCU) for a critical turnaround. The vessels contained high-volume VOCs and H2S that could not be vented or sent to the plant flare. Any delay in clearing these gasses would stall the entire maintenance schedule and increase costs.
What We Did: Envent deployed high-capacity mobile thermal oxidizers and a custom manifold system to degas multiple FCCU points at once. Our technicians managed the process 24/7, providing stable combustion and reaching 99.9% destruction efficiency.
The Result: The FCCU was cleared safely and turned over for maintenance ahead of schedule. Our flareless solution maintained 100% regulatory compliance, prevented site congestion, and shortened the refinery’s critical path timeline.
24/7 Turnaround Support When It Matters Most
When a refinery hits a snag during a turnaround and needs an expert turnkey contractor fast, they call Envent Corporation. When that happens, we mobilize immediately to keep projects on track and compliant. Or, if you’re in the turnaround planning phase now, it’s the right time to call Envent and get ahead of time on potential bottlenecks.
Strategic Planning and Long-Term Reliability
- Advanced Scheduling
Many of Envent’s clients schedule vapor control and water treatment services two to four years in advance of planned outages. - Preparation Quality
That level of preparation makes sure that when the time comes, engineering, permitting, and deployment move smoothly. - Regulatory Alignment
Our process keeps your facility fully aligned with local, state, and federal environmental regulations.
When safety, compliance, and reliability are non-negotiable, you call Envent, the turnaround specialist you trust, not a generalist you hope can handle it.
Specialized Solutions for Refinery Compliance
When every hour of a refinery shutdown impacts your bottom line, you need a partner that delivers precision and speed without compromising regulatory status.
Envent Corporation provides complete refinery turnaround services, ranging from vapor control to mobile water treatment. The facility maintains 100% compliance and maximum operational efficiency during critical MSS (Maintenance, Startup, and Shutdown) windows.
Petroleum Refinery Sector Risk & Technology Review (RSR)
Navigating the New EPA Refinery Sector Rules
The EPA’s latest Refinery Sector Rule (RSR) imposes more stringent emission limits, and Envent Corporation makes sure our customers stay 100% compliant. We understand the evolving regulatory landscape and engineer solutions that meet every new requirement with precision and reliability.
- Eliminated Exemptions
The RSR has removed exemptions for MSS (Maintenance, Startup, and Shutdown) emissions. Every event must now be managed and reported. - Benzene Fence Line Monitoring
The rule introduced Benzene Fence Line Monitoring to track facility-wide emissions. Envent provides the vapor control necessary to keep these levels below regulatory action limits. - Flare Management Plans
Every refinery is now required to maintain a Flare Management Plan to control flare emissions. - Flareless Turnaround Solutions
Envent provides proven, flareless turnaround solutions to help refineries meet these standards without the need for traditional flaring. - FGRU Support
We support Fuel Gas Recovery Units (FGRUs) to manage vapors without disruption, backed by real-world performance and documented case studies.
Featured case study
The Problem: A Port Arthur refinery needed to degas a Hydrocracker Unit without using the facility flare, which was already at maximum capacity. The project required a safe, high-volume method to destroy VOCs and H2S while meeting strict Refinery Sector Rule (RSR) standards and avoiding schedule delays.
What We Did: Envent deployed a fleet of high-capacity mobile thermal oxidizers for a complete flareless turnaround solution. Our team engineered a closed-loop system integrated directly into the unit’s piping technicians provided 24/7 monitoring to manage high flow rates and ensure stable vapor destruction.
The Result: The Hydrocracker was cleared for entry ahead of schedule with 99.9% destruction efficiency. By bypassing the plant flare, we eliminated visible emissions and avoided flaring events. The project maintained 100% regulatory compliance, keeping the refinery on the critical path for mechanical repairs.
Expert Engineering & Customized Turnaround Planning
Envent engineers work directly with your turnaround planning team and environmental department to develop custom solutions for every aspect of vapor control and water treatment, often months in advance of your outage.
- Internal Technical Knowledge
Because our engineers helped design and build the equipment we operate, they know exactly how to boost performance for your specific facility and operating conditions. - Fully Integrated Solutions
Each project combines expert operators, purpose-built equipment, and total compliance support. - On-Site Readiness
We guarantee you have everything on-site and ready when you need it, including: - Oxidizers and Scrubbers
- Knock-out Tanks and Frac Tanks
- Piping, Pumps, and Water Treatment Systems
- Chemical Treatment Systems
- Advanced Monitoring
Reporting and tracking are managed by seasoned Envent professionals to guarantee precision, reliability, and total compliance from planning through execution.
Featured case study
The Problem: A Gulf Coast refinery faced a critical 48-hour weather window to evacuate a 2-mile propane pipeline at >200 psig before a tropical storm. After a competitor took 4 days on a smaller line, the refinery needed a complete solution to reach 0% LEL immediately.
What We Did: Envent deployed an EMECS-70 thermal oxidizer and dual high-rate vaporizers to handle rapid liquid-to-vapor conversion. By using the propane as fuel for the destruction unit and finishing with a nitrogen purge, we maintained total process control.
The Result: The line was cleared in under 8 hours, 4x faster than the competition. This guaranteed environmental compliance, beat the storm, and ensured maximum site safety with zero flaring.
What Clients Say
“Envent’s team saved us days on our turnaround schedule and kept us 100% compliant. Their on-site operators and engineering support were exceptional, proactive, knowledgeable, and safety-driven.”
Refinery Maintenance Manager, Gulf Coast
Recent Refinery Turnaround Projects
Explore Envent’s recent refinery turnaround, tank degassing, pipeline degassing, and vapor control projects across refineries, terminals, pipelines, and marine facilities in the US and Canada.
Navigating the New EPA Refinery Sector Rules (RSR) FAQs
How does Envent handle new EPA RSR stringent emission limits?
The RSR eliminated exemptions for MSS emissions and introduced Benzene Fence Line Monitoring. Envent provides proven,flareless turnaround solutions and supports Fuel Gas Recovery Units (FGRUs) to help refineries meet these standards without disruption.
What is the mobilization timeframe for emergency snags?
We mobilize immediately to keep projects on track and compliant when a refinery hits a snag during a turnaround.
How does Envent help minimize refinery downtime during a turnaround?
Time is money during a shutdown, and we shorten timelines by using the largest fleet of mobile thermal oxidizers, including units capable of handling 34,000 SCFM. Unlike permanent flares, our systems can handle higher nitrogen and hydrogen flow rates during purging, which increases operational efficiency.
What is the benefit of a "flareless" turnaround solution?
Envent provides flareless options that help refineries meet strict MSS (Maintenance, Startup, and Shutdow standards. These strategies reduce emissions, protect your permits, and maintain positive community relations by avoiding visible flaring.
Can Envent manage both vapor and water treatment during a shutdown?
Yes, we provide a complete solution by treating both the vapor streams (like H₂S and benzene) and the water generated during unit cleaning and chemical maintenance cycles.
What safety safeguards are built into your turnaround equipment?
Safety is our top priority, evidenced by our 0.0 TRIR. Our new Turnaround Safety Skid features built-in redundancy and automatic isolation to protect the refinery during unexpected process upsets.
When should we start planning for vapor control for a scheduled outage?
Many clients schedule our services two to four years in advance. Early planned coordination ensures that engineering, permitting, and equipment deployment move seamlessly when the turnaround begins.
Can your systems handle hazardous streams like Hydrogen Sulfide (H₂S) and Ammonia?
Our latest custom scrubber systems are specifically engineered to handle ammonia, H₂S), and other complex odor control challenges during deinventory and degassing.
What makes Envent’s mobile thermal oxidizers different from refinery flares?
Do you provide on-site support and monitoring?
We deploy 24/7 field teams experienced in high-risk refinery operations. Our professionals manage sophisticated monitoring and reporting on-site to guarantee total vapor destruction and compliance.
Ready for a Safer, Faster Refinery Turnaround?
Partner with Envent Corporation to improve your operational efficiency with the industry’s largest and latest fleet of mobile thermal oxidizers. Our engineering team provides complete, custom-engineered solutions that guarantee 100% RSR compliance and shorten your critical path.
