Vapor Control & Degassing Services


Evergreen’s GEM division has been performing various forms of vapor, odor and emissions control since 1994. Our staff is trained and experienced in applying cutting-edge treatment technologies to ensure our clients emissions challenges are met while we focus on safety and compliance.  Whether it's vapor combustion, liquid vapor scrubbing, or carbon absorption, Evergreen has the appropriate solution.

Tank & Pipeline Degassing

Evergreen’s GEM division offers mobile vapor control and degassing through a variety of proven technologies. Our staff is trained and experienced in applying cutting-edge technologies to ensure our customers’ emissions challenges are met with emphasis on safety and compliance. Based on customer project specifics including tank size and product type, our equipment diversity brings unique project efficiencies by applying the properly sized unit to a tank or pipeline. We operate a diverse fleet of Mobile Vapor Combustion Units ranging in size from 1.5 MMBTU to 60 MMBTU and can handle various vapor flow rates up to 3,000 SCFM. (Access Equipment Specification Sheets) By offering the broadest range of vapor combustor sizes, we have the ability to handle low-flow passive vapor control needs, or specialty high-flow vapor destruction, typical for large product or crude tanks. Whether it’s vapor combustion, liquid vapor scrubbing, or carbon absorption, we have the appropriate solution.

Vapor Scrubbing & Odor Control

Evergreen’s GEM division provides liquid scrubbing solutions to enhance carbon vapor control systems. We utilize specialized chemistry to control VOC's, proprietary caustic solution to scrub H2S, and acid to remove ammonia from vapor streams. Frequent carbon burnout is often an issue for vacuum truck exhaust during turnarounds, tank cleaning and pipeline suction projects involving crude oil and gasoline or other light-ends. Combining a liquid scrubber with activated carbon will prevent the need for frequent stoppages to replace spent carbon, as well as reduce spikes in vapor concentrations which can quickly raise the temperature of carbon to dangerous levels.

Our in-house equipment has flow capacity of up to 5,000 SCFM.  We offer single vessel, combination vessel, and a number of specialty packed scrubbers. (Access Equipment Specification Sheets) 

Similarly, our combination of carbon with liquid scrubbing is often the most cost-effective approach for controlling vapors generated by sludge processing operations, barges, tankers, and API separators.

Marine Vapor Control Services

Our GEM division has applied the extensive experience in vapor combustion to controlling the vapor emissions from product or crude oil marine loading activity. With the high-flow capacity of our thermal units, our marine loading clients are able to obtain the necessary flow rates needed to meet the shipment demands of their customers. In combination with a GEM Dock Safety Skid (DSS), our systems are Coast Guard Compliant per 33 CFR 154 Subpart E are provided with a facility CE certification. Our Marine Vapor Control Systems have served customers on all coasts as well as on the major inland waterways throughout the US and is experienced working with the USCG to help obtain the necessary permits required for safe loading operations.

We recognize the importance of equipment reliability by prioritizing preventative and scheduled maintenance and will dispatch our technical personnel from any of our service locations throughout the US at a moment’s notice to minimize downtime. 

Barge & Ship Degassing

Our vapor combustion equipment has been often utilized for the degassing of barges or ships that transport volatile products throughout our inland waterway systems or over oceans. We routinely clear vapors from compartments after product stripping, prior to entry for safe cleaning, or for safe transport to loading destination. Our vapor control systems comply with applicable USCG regulations.   

Featured Project

Eliminate Hydrogen Sulfide from Barges Prior to Cleaning

Vapor Scrubbing & Odor Control | Industrial Cleaner – Gulf. Read More


Let Evergreen handle all your industrial service needs. Get in touch with us today!

Contact Us


Corporate Headquarters
704-C Old Underwood Rd.
La Porte, Texas 77571
Phone: 281.478.5800
Toll-Free: 1.877.267.2840
Fax: 281.478.5004

7888 Beauxart Garden Rd.
Nederland, TX 77627
Phone: 409.727.2900

Corpus Christi
421A Junior Beck Drive
Corpus Christi, TX 78405
Phone: 361.452.2331

La Porte
704-C Old Underwood Rd.
La Porte, Texas 77571
Phone: 281.542.1052
Fax: 281.542.9870

La Porte 
1434 Sens Rd. 
LaPorte, TX 77571 
Phone: 281.471.0107 
Fax: 281.471.01622

1004 Pine Street
Monroe, LA 71201
Phone: 318.324.9444

Texas City
3331 FM 1765
Texas City, TX 77590
Phone: 409.945.6700

Lake Charles
214 Walcot Rd.
Westlake, LA 70669
Phone: 337.882.6588

El Dorado
765 Del Tin Highway
El Dorado, AR 71730
Phone: 870.863.8744

West Coast Locations

Northern California
3915 Teal Ct.
Benicia, CA 94510
Phone: 707.751.1710
Fax: 707.751.1711

Southern California
2525 Cherry Hill Ave. 
​Suite 105
Signal Hill, CA 90755 
Phone: 562.436.2999 
Fax: 562.495.1039