Mobile Tank & Vessel Degassing Services
Engineering Excellence in Emission Control
Since 1992, Envent Corporation has provided the petrochemical and midstream sectors with the fastest, safest, and most proven degassing technology in North America. Our proprietary EMTOS (Envent Mobile Thermal Oxidation System) and EMECS (Envent Mobile Emission Control System) are engineered to minimize downtime with 100% regulatory compliance.
EMTOS: Direct-Flame Thermal Oxidation
Our EMTOS units are EPA-recognized as Best Available Control Technology (BACT).
- Performance
Guaranteed >99.99% Destruction Removal Efficiency (DRE). - Operating Temperature
≥ 1,400 °F to eliminate VOCs, Benzene, H₂S, and Butadiene. - Capacity
250 – 4,500 CFM units available. - Speed
Degas a 150-ft tank in as little as 6 hours; a 250-ft tank in under 24 hours.
EMECS: High-Capacity Vapor Combustion
Envent’s EMECS fleet provides the highest thermal destruction capacity in the industry for high-volume tank refilling and degassing.
- Flow Rates
Safely refill tanks at rates up to 20,000 barrels per hour. - Fleet
20 – 75 MMBTU/hr systems; the largest and newest fleet in North America.
Global Regulatory Compliance & Permitting Expertise
Trust is built on compliance. Envent systems exceed the strictest air quality standards across the US and Canada. We don’t just provide equipment; we provide the permitting strategy and regulatory peace of mind required for Title V and MACT standards.
Our engineering team bridges the gap between complex environmental mandates and field execution, delivering the verified performance data and certified technical logs necessary to withstand the most rigorous agency audits.
EMTOS and EMECS exceed the strict rules in every major jurisdiction including but not limited to:
- EPA NSPS & MACT (40 CFR Parts 60 & 63)
- SCAQMD Rule 1149 (South Coast AQMD Tank Degassing)
- TCEQ Chapter 115 (Texas Storage Tank Degassing)
- CARB Vapor Recovery Rules (California Air Resources Board)
- BAAQMD Regulation 8 (Bay Area AQMD)
- NJDEP Air Permits (New Jersey)
- LDEQ Air Quality Regulations (Louisiana)
- Washington DOE Air Quality Permits
- Ontario MECP Air Emissions (Canada)
- Canadian Environmental Protection Act (CEPA) Registry
Coverage extends to virtually every other state, provincial, and local air district across the U.S. and Canada.
Need a permit fast? We maintain existing relationships with regulators to streamline your approval timeline.
Advanced Emission Control Technology: The Envent Advantage
High-Performance Thermal Oxidation
Our proprietary thermal oxidizers provide the highest heat-input and flow-rate capacities available in a mobile configuration, make sure rapid degassing without compromising safety.
- Scale & Capacity
Units range from 250 CFM to 6,000 CFM with heat ratings from 1.5 MMBTU to 77 MMBTU. - Destruction Efficiency
Engineered to maintain temperatures ≥ 1,400°F, achieving a guaranteed >99.99% Destruction Removal Efficiency (DRE). - Compliance
Fully compliant with EPA BACT (Best Available Control Technology) and MACT standards.
Comprehensive Vapor Scrubbing & Adsorption
For applications where combustion isn’t ideal or where specific chemical neutralization is required, Envent utilizes a multi-stage scrubbing approach.This method uses mechanical separation and liquid media to neutralize toxic gases like ammonia and H2S at the molecular level.
- Recirculating Scrubbers
Designed for high-concentration H₂S and acid gas removal. - Passive Systems
Scalable solutions for vacuum trucks, frac tanks, and temporary process upsets. - Carbon Adsorption
Specialized media for polishing and final-stage VOC removal to meet “non-detect” requirements.
Safety-First Engineering & Operational Flexibility
- HAZOP Integration
We don’t just deploy; we analyze. Hazardous Operability Studies (HAZOP) are performed on all systems to mitigate risks before the project begins. - Hazardous Area Rating
Our fleet includes Class 1, Div 2 certified systems, allowing for safe operation in explosive atmospheres (Zones 1 & 2). - Service Models
We offer high-touch Turnkey Operations (Envent technicians on-site 24/7) or Long-Term Rentals for ongoing facility compliance.
Our engineering approach handles site-specific pressures and chemicals. By pairing strict safety with modular equipment, we adapt to field changes without compromising compliance.
Comprehensive Vapor Profile: Compounds We Control
- VOCs & BTEX Control
We provide high-efficiency abatement for Benzene, Toluene, Ethylbenzene, and Xylenes using a dual-stage approach of thermal oxidation and specialized adsorption media. - H₂S & Sulfur Management
We eliminate Hydrogen Sulfide (H₂S) and odors from Mercaptans through a two-part process involving liquid scrubbing and high-temperature oxidation. - Regulated HAPs & Specialty Toxics
Our technology is engineered to destroy high-risk pollutants like Ethylene Oxide (EtO) and chlorinated hydrocarbons while preventing the formation of dioxins. - Pyrophoric & Reactive Species
We use chemical circulation and real-time monitoring to stabilize reactive iron sulfide scales before equipment is opened to the atmosphere.
Why Industry Leaders Trust Envent
Since 1992, Envent Corporation has remained the premier choice for North America’s most complex tank degassing and vapor control challenges. By combining the continent’s largest fleet of EMTOS and EMECS thermal oxidizers with a “Safety-First” engineering culture, we don’t just manage emissions we provide operational certainty.
The Envent Approach
- Rapid Mobilization
24/7 emergency response to minimize facility downtime. - Total Compliance
100% adherence to EPA, SCAQMD, TCEQ, and LDEQ mandates. - Proven Results
99.99% DRE on VOCs, H₂S, and high-hazard HAPs. - Engineering Depth
Custom HAZOP-backed solutions for every project.
Our commitment extends beyond equipment to provide the technical certainty needed for high-stakes operations. Every project includes certified data logging and real-time monitoring to provide a defensible performance record for state and federal auditors.
What Our Clients Say
Featured Case Studies
The Problem: A Gulf Coast refinery faced a critical reactor failure in its alkylation unit. With a 7-day restart window, the team had to degas a 90% hydrogen vapor stream under extreme conditions 200 PSIG and 320°F while adhering to a strict “no-flaring” mandate.
What We Did: Envent deployed the EMECS-77, the nation’s largest mobile emission control system. Our engineers combined high-capacity thermal oxidation with chemical scrubbing to neutralize toxic compounds. Using high-pressure heat exchangers and detonation arrestors, we safely managed the explosive hydrogen levels across three cleaning phases.
The Result: The reactor was back in service by Day 7, preventing millions in losses. The project achieved 99.9% destruction efficiency and 100% compliance with BWON and Refinery Sector Rules, all with zero safety incidents.
The Problem: A Southern California facility faced VOC leaks up to 10,000 ppmv from aging DAF cell lids. These fugitive emissions risked $25,000 daily fines under SCAQMD Rule 1173. Temporary carbon canisters had failed to stop the leaks, leaving the site open to regulatory action.
What We Did: Envent installed a permanent, plant-integrated thermal oxidizer system. By using motorized dampers to maintain continuous negative pressure across all DAF cells, the system captures vapors before they can escape. The automated, PLC-driven unit was tied into plant utilities to lower fuel costs and allow for 24/7 unmanned operation.
The Result: The site achieved 100% elimination of fugitive emissions, with post-installation tests recording 0 ppmv at every seal. The facility passed all inspections and removed the DAF cells from mandatory monitoring lists. This long-term solution reduced labor costs and is built for 20 years of service.
Tank & Vessel Degassing: Frequently Asked Questions
What is the difference between EMTOS and EMECS?
How quickly can Envent degas a large storage tank?
Does Envent handle the permitting process with local air districts?
What is Destruction Removal Efficiency (DRE), and what does Envent guarantee?
Can your systems handle high-concentration Hydrogen Sulfide (H₂S)?
Are Envent systems safe for use in explosive environments?
Yes. Our fleet includes Class 1, Division 2 certified systems specifically engineered for hazardous locations. Additionally, we conduct HAZOP (Hazardous Operability Studies) on all systems to ensure fail-safe operations.
What compounds are your mobile units permitted to treat?
Our permits cover a wide range of regulated substances, including BTEX (Benzene, Toluene, Ethylbenzene, Xylene), 1,3-Butadiene, Ethylene Oxide (EtO), Ammonia, and Chlorinated Hydrocarbons (VCM, EDC, etc.).
Do you offer 24/7 emergency response for vapor control?
Yes. Envent maintains a 24-hour emergency hotline(888-997-9465). We have the largest fleet in North America, allowing us to mobilize equipment and engineering crews rapidly to stabilize sites following equipment failure or accidental releases.
How do you monitor emissions during a project?
We provide continuous emissions monitoring using FID/PID sensors, flow meters, and temperature chart recorders. This data ensures 100% transparency and provides the necessary documentation for your regulatory compliance records.
Can you support vacuum truck and barge loading operations?
Yes. We provide specialized vapor recovery and control for liquid ring vacuum trucks, marine barge loading, and railcar loading. Our systems prevent the release of displaced vapors during high-volume product transfers.
Partner with America’s Degassing Experts
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