Marine Vapor Recovery

Envent Mobile USCG Certified Marine Emission Control Systems

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 standards govern the design, operation, and certification of vapor control systems used during marine loading operations.

Our 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, ensuring full compliance with USCG-approved safety and emission control protocols.

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.

Envent delivers flexibility, safety, and proven USCG-compliant performance — wherever your marine operations take you.

Barge Degassing

Marine Vessel Degassing

Degassing of barges and ships follows the same principles as land-based tank degassing, as both contain volatile organic compounds (VOCs) that must be controlled and destroyed under local, state, and federal Clean Air Act regulations.

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.

REGULATORY REQUIREMENTS

Regulatory Compliance

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.

Envent’s systems are fully compliant with:

Title 33, Code of Federal Regulations (CFR), Part 154 – USCG regulations governing marine vapor control systems
Title 40, CFR, Parts 61 and 63 – EPA regulations under the Clean Air Act governing the control of hazardous air pollutants and VOC emissions.

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

Leader in Mobile Marine Vapor Control

North America’s 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.

Envent’s Portable Dock Safety Skids and high-capacity vapor combustion units can be mobilized rapidly, giving marine terminals the flexibility to maintain full operational and regulatory compliance. Our engineers work directly with your team to ensure all operations meet U.S. Coast Guard standards under 33 CFR 154—without the need for a time-consuming “gap analysis.”

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.

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.

Benefits of the EMECS / EDSU include:

Eliminate Capital Expenditure
Eliminate Engineering — Envent Engineers Handle Everything
Eliminate CEQA Permitting
USCG Compliance (33 CFR 154) — No “Gap Analysis” Required
Fully Integrated Dock Safety Unit — Skid Mounted and Operator Controlled
Pre-Approved HAZOP System
Avoid Building Permits
Avoid Air Permitting — Envent Manages the Process

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

Envent Dock Safety Unit (EDSU)

The Envent Dock Safety Unit (EDSU) is a skid-mounted safety system positioned near the facility’s vapor connection — typically on the wharf or dock adjacent to the marine vessel being loaded with hydrocarbon commodities.

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 — providing safe, reliable vapor handling for marine loading operations without permanent installation or capital investment.

Envent Mobile Emission Control System (EMECS)

The Envent Mobile Emission Control System (EMECS) is a horizontal combustion thermal oxidizer engineered for Marine Vapor Recovery applications. Capable of operating at temperatures exceeding 1,400°F, the EMECS ensures complete combustion and destruction of hydrocarbon vapors generated during marine loading operations.

Available in sizes ranging from 20 to 77 MMBTU/hr, the EMECS features a fully enclosed firebox with dual horizontally fired waste-gas burners, each equipped with fixed pilots and flame safeguard systems for reliable ignition and sustained performance. This design delivers high destruction efficiency while maintaining operational safety in dynamic marine environments.

The EMECS is typically positioned away from the wharf or dock—in a non-classified safe zone—to allow safe combustion operations. To maintain safety clearances, the system is located a minimum of 30 meters from the nearest active berth.

Fully compliant with all U.S. Coast Guard (USCG) regulations, the EMECS incorporates multiple built-in safety systems, including fire-safe valves, redundant detonation arrestors, and real-time monitoring instrumentation capable of instantly detecting and responding to process upsets.

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.