Marine Vapor Recovery & Barge Degassing Services

North America’s Leader in Portable Marine Vapor Recovery Systems

Envent Corporation’s Portable Marine Vapor Recovery Systems are U.S. Coast Guard (USCG) compliant, meeting all requirements outlined under 33 CFR 154 Subpart P (Vapor Control Systems) and 46 CFR 39 (Vapor Control Systems for Tank Vessels). These federal standards govern the design, operation, and certification of vapor control systems used during high-stakes marine loading operations.

Our complete systems, the Envent Mobile Emission Control System (EMECS) and the Envent Dock Safety Unit (EDSU) are engineered to safely and efficiently destroy explosive vapors from marine cargo vessels during hydrocarbon loading activities, making sure full compliance with USCG-approved safety and emission control protocols.

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” They provided timely communication and, with the support of their teams, contributed to a safe Turnaround. Their quick response to events helped us maintain our commitments to safety and the environment. I would not hesitate to recommend them to lead crews on other jobs.”

Area Technical Manager at Irving Oil

“They deliver exceptional performance, over and beyond our expectations contractually.”

S&H Superintendent at BP

Based on this experience, I am comfortable recommending Envent Corporation for any degassing, vapor control, or related services. Their technical capability and consistent performance make them a dependable service provider.

Senior Project Engineer, Valero Houston Refinery

Envent Corporation completed their scope ahead of schedule and under budget. Their planning, resource management, and execution met the needs of the project.

Senior Project Engineer, Valero Houston Refinery

Safety remained a consistent focus during the project. Envent Corporation’s approach to identifying and addressing potential risks contributed to a safe work environment for personnel.

Senior Project Engineer, Valero Houston Refinery

Envent Corporation mobilized promptly and reached the required degas threshold within 18 hours of startup, prior to any tank washing or cleaning.

Senior Project Engineer, Valero Houston Refinery

Envent Corporation demonstrated professionalism and provided reliable engineering and operational support throughout the job.

Senior Project Engineer, Valero Houston Refinery

The Critical Need for Marine Emission Control

The Clean Air Act of 1990 mandates the control of volatile organic compound (VOC) emissions from all sources, including marine loading operations. To meet these requirements, Marine Vapor Recovery (MVR) systems at terminals must comply with both U.S. Coast Guard (USCG) and U.S. Environmental Protection Agency (EPA) regulations.

When new opportunities arise at your marine terminal, Envent delivers immediate, compliant solutions. Our portable systems provide all the performance of a fixed facility, without the capital cost, enabling terminals to load safely, maintain full environmental compliance, and protect nearby communities and waterways.

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Specialized Marine Vapor Control

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Barge Degassing
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Barge & Marine Vessel Degassing

Barge and ship degassing is significantly more complex than land-based operations, requiring strict adherence to both environmental Clean Air Act mandates and rigorous U.S. Coast Guard (USCG) safety standards. Envent is uniquely qualified to manage these overlapping regulations, providing the specialized, USCG-certified equipment and expertise necessary to ensure your marine operations remain 100% compliant and safe.

Envent Corporation’s Marine Vapor Control Systems are fully U.S. Coast Guard (USCG) compliant, meeting all requirements under 33 CFR 154 Subpart P for vapor control and destruction during marine operations. Envent delivers trusted, USCG-approved solutions for marine vapor control and degassing proven in ports and terminals across North America.

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Dockside Degassing of LNG
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Regulatory Requirements & Compliance

The Clean Air Act of 1990 requires control of VOC emissions from all sources, including marine loading, so Marine Vapor Recovery systems at terminals must comply with both U.S. Coast Guard and U.S. Environmental Protection Agency regulations to keep your project in full regulatory compliance.

  • Title 33 CFR Part 154 (Subpart P): USCG rules for marine vapor control systems.
  • Title 40 CFR Parts 61 and 63: EPA Clean Air Act rules for hazardous air pollutants and VOC emissions control.

Envent, setting the standard for compliant, USCG – and EPA – approved marine vapor control.

Featured case study

Mid-West, USCG Certified Marine Vapor Recovery System

The Problem : A refinery needed to perform pipeline maintenance without halting barge shipments. A total shutdown would have cost over $3M in lost revenue and violated strict USCG 33 CFR 154 emission standards.

What We Did : Envent provided a complete temporary Marine Vapor Control System (MVCS). We handled the vapor flow using an EMECS thermal oxidizer and a Dock Safety Unit (EDSU), allowing loading to continue safely while the pipeline was out of service.

The Result : The refinery avoided a $3M loss and maintained 100% regulatory compliance. We guaranteed >99.9% destruction efficiency and shortened the operational impact with zero safety incidents.

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Leader in Mobile Marine Vapor Control

Envent Corporation is the North American leader in mobile marine vapor control for ships and barges. With systems ready to deploy to ports across the continent, Envent is the industry’s #1 choice for safe, compliant, and cost-effective marine vapor management.

Our engineers work directly with your team to make sure all operations meet U.S. Coast Guard (USCG) standards under 33 CFR 154 (Subpart P), without the need for a time-consuming.

EPA BACT Standards:
Our vapor combustors are source-tested to meet U.S. EPA Best Available Control Technology (BACT) standards and are proven to deliver complete destruction efficiency with full safety redundancy.

  • Engineered Safety:
    The Envent Mobile Emission Control System (EMECS) and Envent Dock Safety Unit (EDSU) eliminate the need for permanent design, engineering, or permitting investments, allowing you to operate safely and in compliance without capital expense.

Core Benefits of the EMECS / EDSU Systems

By using our portable marine vapor destruction technology, terminals gain significant operational advantages:

  • Eliminate Capital Expenditure
    No massive upfront investment for permanent infrastructure.
  • Eliminate Engineering
    Envent Engineers handle everything, from setup to operation.
  • USCG Compliance (33 CFR 154 Subpart P)
    Our systems are pre-certified to meet rigorous U.S. Coast Guard safety standards.
  • Fully Integrated Dock Safety Unit
    Skid-mounted and operator-controlled for maximum reliability.
  • Pre-Approved HAZOP System
    Safety protocols are already established and verified.
  • Avoid Building Permits
    Mobile equipment bypasses traditional construction permitting delays.
  • Envent Handles air permit
    Envent manages the process to make sure your project stays compliant.

Envent delivers flexibility, compliance, and confidence, wherever your marine loading operations take you.

Envent Dock Safety Unit (EDSU)

The Envent Dock Safety Unit (EDSU) is a skid-mounted safety system that operates on the dock and, in some cases, may even act as the facility vapor connection itself. It is typically set up on the wharf adjacent to the marine vessel being loaded with hydrocarbon commodities to provide a critical interface between the vessel and the destruction equipment.

The EDSU receives vapors from marine cargo holds and incorporates multiple layers of engineered safety controls, including safety interlocks, detonation arrestors, and a vapor-enriching system designed to maintain vapor concentrations outside the explosive range before directing them to the vapor destruction unit. This system is fully U.S. Coast Guard (USCG) compliant and designed for rapid mobilization and quick setup.

Envent Mobile Emission Control System (EMECS)

The The Envent Mobile Emission Control System (EMECS) is a horizontal combustion thermal oxidizer engineered for Marine Vapor Recovery applications. Operating above a minimum EPA mandated temperature of 1400F, the EMECS makes sure complete combustion and destruction of hydrocarbon vapors generated during marine loading operations.

  • High-Capacity Performance
    Available in sizes ranging from 20 to 77 MMBTU/hr.
  • Safety First
    Features fire-safe valves, redundant detonation arrestors, and real-time monitoring to instantly detect and respond to process upsets.
  • Strategic Placement
    Typically positioned away from the wharf in a non-classified safe zone (minimum of 30 meters from the nearest active berth).

When paired with the Envent Dock Safety Unit (EDSU), the EMECS forms a fully certified, 100% compliant Marine Vapor Control System, designed for both short-term and long-term ship or barge loading vapor control needs.

Featured case study

North Dakota Tank Vapor Control

The Problem: A Bakken producer needed to fill 30 frac tanks simultaneously with high-vapor-pressure crude oil. The operation generated massive vapor flows (1,000 scfm) containing high concentrations of H₂S and BTEX. Traditional carbon systems were expected to saturate in days, requiring frequent, costly change-outs in a remote location and risking NDDEQ compliance violations.

What We Did: Envent deployed a specialized mobile thermal oxidizer capable of handling high-purity methane streams. We engineered a secure vapor-recovery connection from the ship’s tanks to our combustion unit, while OQ-qualified technicians provided 24/7 monitoring to maintain stable and complete vapor destruction..

The Result:The ESCRUB system achieved >99% removal efficiency and ran for 45+ days with zero media swaps, while the carbon system failed in under 12 days and required three change-outs. Envent saved the client $21,000 in direct costs, eliminated logistical delays, and ensured 100% regulatory compliance.

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Explore Envent’s Recent Marine Vapor Recovery & Barge Degassing Projects

From critical-path port operations to emergency maritime responses, Envent delivers engineering-driven results across the United States and Canada. Our project history showcases our ability to maintain 100% compliance while improving operational timelines for the world’s leading marine terminals and shipping operators.
Liquefied Natural Gas (LNG) Cargo Ship Degassing

Liquefied Natural Gas (LNG) Cargo Ship Degassing

June 17, 2025
Mid-West, USCG Certified Marine Vapor Recovery System

Mid-West, USCG Certified Marine Vapor Recovery System

June 17, 2025
California Refinery Barge Loading

California Refinery Barge Loading

July 2023
Liquefied Natural Gas (LNG) Barge Degassing – Alabama

Liquefied Natural Gas (LNG) Barge Degassing – Alabama

June 17, 2025
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Marine Vapor Recovery & Barge Degassing FAQs

Does Envent meet USCG standards?

Yes. Our systems are fully compliant with Title 33 CFR Part 154 Subpart P, the governing standard for marine vapor control systems. Every Envent system is pre-certified for marine applications and arrives on-site with a formal equipment letter, ensuring your operations meet both USCG and EPA requirements without the need for a costly or engineering delays.

Yes. We comply with Title 40, CFR, Parts 61 and 63 under the Clean Air Act, governing the control of hazardous air pollutants and VOC emissions.

Envent focuses on Marine Vapor Destruction because it is the most reliable method for achieving the >99.9% Destruction Removal Efficiency (DRE) required by the EPA and USCG. Our EMECS thermal oxidizers ensure that volatile hydrocarbons are completely neutralized rather than just captured, providing a safer and more definitive compliance solution for high-flow marine loading.

Yes. The Envent Dock Safety Unit (EDSU) is designed to act as the interface between the vessel and the destruction equipment, and in many cases, it acts as the facility vapor connection itself. Because this connection point is fluid under maritime regulations, we can position the EDSU on the wharf or dock to best fit your terminal’s layout.

Envent supports a wide range of tank vessels under 46 CFR 39 standards. We provide complete solutions for barge and ship loading, as well as marine vessel degassing to remove VOCs before maintenance or inspections.

The EDSU is a skid-mounted system positioned on the wharf that acts as the primary  safety interface. It provides multiple layers of protection, including detonation arrestors and a vapor-enriching system to keep vapor concentrations outside the explosive range.

The EMECS is a high-capacity  thermal oxidizer that operates at temperatures exceeding 1,400°F to guarantee complete combustion. It is strategically placed in a non-classified safe zone, typically at least 30 meters from the active berth.

Absolutely. Our portable systems provide the performance of a fixed facility without the massive capital expenditure. This allows terminals to handle new hydrocarbon loading opportunities immediately.

Yes. Envent handles the air permitting process and ensures your project remains in full compliance. Our mobile equipment allows your terminal to bypass traditional building permit delays, providing a streamlined path to operation.

The Envent Dock Safety Unit (EDSU) acts as a critical safety interface, often serving as the facility vapor connection itself. It utilizes multiple layers of protection, including detonation arrestors and vapor-enriching systems, to keep vapor concentrations outside of the explosive range before they reach the destruction unit.

Immediate, USCG-Compliant Marine Vapor Solutions

Expand your terminal’s capacity without the capital expense of fixed infrastructure. Envent’s engineering team provides complete USCG-compliant vapor recovery and degassing solutions that shorten your project timelines. We guarantee 100% regulatory standing and handle all permitting to keep your marine operations moving safely.
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