Cedar Bayou, TX, Water Filtration & Discharge Project

Cedar Bayou, TX, Water Filtration & Discharge Project

Portfolio Categories: All and Mobile Water Treatment.

Challenge
A Houston-based chemical company had consistent issues with high amounts of suspended solids in their storm water. The run-off collected on-site would foul up their treatment facility which reduced their capacity for treatment. As a result, our customer would have to rent extra containers to divert excess flow. Do to the storm water build up; the customer needed a solution as soon as possible.

Solution
Envent engineers addressed this emergency issue with a mobile sand filter system that was capable of handling the required flow and suspended solid concentration. The engineered system required minimal supervision because of automatic back-flushing and redundant features.

Benefit
The mobile system allowed us to maneuver in to place quickly providing the immediate response to the customer’s issue. The system easily connected upstream and in-line to the customer’s treatment facility, the sand filter system removed 90% of the solids which enabled the treatment facility to perform more efficiently without the need for additional water storage.

"Removed 90% of the solids which enabled the treatment facility to perform more efficiently"

Pennsylvania Refinery, Pipeline Degassing

Portfolio Categories: All, Case Studies, and Degassing.

Challenge
A 12” propane pipeline was being re-commissioned by a refinery in Pennsylvania. During the re-commissioning of the pipeline a leak was detected. The leak was isolated between two stations roughly 16 miles of pipeline. In total 12,000 barrels of propane needed to be combusted as quickly as possible.

Solution
Liquid propane was routed to two 200 gallon/hour vaporizers and then to a 20 million BTU/hr thermal oxidizer. In addition to being used as fuel to keep the burners lit, the vaporized gases were sent into the process line to be destroyed. By using the vapors in two ways, the time to depressure the pipeline was completed 4 times as fast.

Benefit
The pipeline was safely depressured and degased of liquid propane. The use of Envent’s thermal oxidizer was safer than running directly to the mobile flare because there is no detonation arrestor on a mobile flare. This safety feature is one of many which helped make the job safe, as well as time efficient.

By using the vapors in two ways, the time to depressure the pipeline was completed 4 times as fast.

Torrance, California Refinery Emergency Turnaround Support

Portfolio Categories: All and Turnaround Services.

Challenge
A refinery’s primary flare for the onsite tank farm was being taken offline for emergency maintenance. Envent provided a thermal oxidizer capable of destroying vapors during this maintenance period. The vapors of over 10 tanks were routed to Envent’s thermal oxidizer during this time.

Solution
Envent was able to correctly size a thermal oxidizer capable of handling the concentrated vapor stream from all the tanks. Envent was also able to respond within 4 hours, which ensured the customer stayed within the site’s emissions permit. Envent handled the emissions for this facility for an entire month until the primary flare was returned to service.

Benefit
The facility was able to continue tank farm operations during the emergency turnaround without shutting down. The site remained in operation without any regulatory fines.

Client continued tank farm operations during the emergency turnaround without shutting down.

San Francisco, Gasoline Barge Degassing

Portfolio Categories: All, Case Studies, and Marine Vapor Recovery.

Challenge
An energy and industrial services company needed to degas a barge in California. The barge was made up of 10 individual compartments each capable of holding 8,000 barrels of gasoline. The energy company was in need of someone who could degas all ten compartments quickly and effectively.

Solution
After speaking with the customer, Envent was able to provide a quick and effective solution for degassing all the compartments. The engineering experts at Envent ensured all the necessary permits were obtained, and made sure the customer was in compliance with local laws. Envent decided to use an EMTOS unit with a hose routed to the barge. The EMTOS, or Envent Mobile Thermal Oxidizer System, flowed at an average of around 1300 SCFM throughout the degas, with a 99.9% destruction efficiency.

Benefit
The EMTOS was able to degas each compartment in two hours each. The customer was happy with the ease of transferring the different compartments into the EMTOS. The barge was able to be cleaned and recommissioned ahead of schedule, which increased profitability for the customer.

Degassed each compartment in 2 hours, with a 99.9% destruction efficiency.

Kentucky Refinery, Emergency Tank Degas

Portfolio Categories: All, Case Studies, and Degassing.

Challenge
A tank farm customer requested Envent be onsite for an unscheduled tank refill within 4 hours. The fill rate was to be 2500 barrels/hour of gasoline. The tank size was 250,000 barrel tank with a slotted gauge vapor connection point.

Solution
Envent was able to mobilize an Emtos 2500 thermal oxidizer within the hour. Envent was onsite within two hours and set up and ready to process vapors within the 4 hour time frame. The thermal oxidizer captured and destroyed greater than 99.9% of all vapors displaced by the refilling of the gasoline tank.

Benefit
The tank farm was able to complete the tank refill on schedule with no down time. Envent was able to respond to the emergency quickly and safely, which saved the customer thousands of dollars in down time.

Envent was able to respond to the emergency quickly and safely, which saved the customer thousands of dollars in down time.

San Francisco, Marine Terminal Barge Degas

Portfolio Categories: All and Marine Vapor Recovery.

Challenge
Marine loading services typically don’t come with extensive prior notification. A client notified Envent on May 13th at 09:00 that a barge would commence loading at 10:00 on May 15th and would require Envent’s vapor control expertise. The load consisted of 250,000 barrels of high octane naphtha loaded at approximately 3,300 barrels per hour. Envent’s team quickly notified the SCAQMD (South Coast Air Quality Management District)  that vapor control activities would be occurring (a regulatory compliance requirement).

Solution
Testing and preparations were completed on the EDSU (Envent Dockside Safety Unit) and EMECS-42 (Envent Mobile Emission Control System) to maintain compliance with the US Coast Guard regulations. As loading commenced, the client’s terminal pumps failed to provide consistent loading rates and large fluctuations were experienced in the EDSU and EMECS-42.

Benefit
Envent’s experienced crew successfully maintained the required 99% DRE (Destruction Rate Efficiency) and completed the barge loading. The client saved approximately $147,000 by contracting Envent as the mobile vapor control provider.

Cost Savings: $147,000 Location:  West Coast Terminal Product: High Octane Naphtha

Louisiana Refinery, H2S & Sulfur Dioxide (SO2) Vapor Scrubber

Portfolio Categories: All and Vapor Scrubbing.

Challenge
A customer requested our specialty vapor scrubber experience to evaluate controls needed on a sulfuric acid tank. Occasionally, the tank would vent and sulfur dioxide odor would be registered at a nearby school. They restricted operations until a solution could be achieved.

Solution
Envent engineers offered our high flow recirculating scrubber and EMTOS unit. The combination resulted in 100% vapor abatement while allowing operations to commence undisturbed.

Benefit
In addition to the scrubber eliminating the sulfuric acid vapors, our EMTOS thermal oxidizer was used downstream to remove all of the unwanted hydrocarbon vapors. The tank was returned to service much quicker and safer than in the years prior. The nearby school was no longer affected, which is immeasurable for a plant, and operations were no longer restricted for the customer.

Project: Sulfur Dioxide Vapor Scrubber Location: Beaumont, Texas Product: Sulfuric Acid

Central California Dewatering and Treatment for Soil Excavation

Portfolio Categories: All, Case Studies, and Mobile Water Treatment.

Challange
A customer at a Super Fund Site in Central California needed support to dewater a pit dug in a neighborhood in order to remove contaminated soil. Hauling out the wet soil would have added higher shipping cost and additional hazards over the road. The discharge limits had to meet the local POTW regulatory permit for the on-site treatment to be cheaper than hauling off.

Solution
Envent quickly responded with unmanned automated treatment system. Sump pumps in custom containers were utilized with float switched to automatically turn on and off depending on the water level. Water was treated and pumped in to two 500 BBL temporary storage tanks. Automatic discharge was executed with an additional pump operated by automatic float switches. For additional safety measures on the unmanned system, high level float switches and a trouble alarm were utilized in combination with an automatic dialer to notify Envent and the customer if any issues occurred.

Benefits
By expediting the sampling and analysis, the turnaround time for the laboratory result was shortened and the total project time had been cut significantly. Eventually the overall cost of treating and discharging the water was at a fraction of the cost had the soil been hauled off wet and treated off site. The automatization significantly reduced the cost of onsite manpower and added the safety of high level floats to prevent any tanks from being over filled. The customer was pleased with the quick operations and savings of our treatment system.

"Cost of treating and discharging the water was at a fraction of the cost"

Northern California, Pipeline Blowdown

Portfolio Categories: All, Case Studies, and Degassing.

Challenge
A pipeline company in Northern California needed to blow down their natural gas pipeline for repairs and inspection. The 18” line was initially depressured to the minimum possible pressure, which still left 90 PSI of natural gas. Also, the zero-liquid condition could not be determined prior to operation.

Solution
Envent efficiently mobilized a high pressure separator and a thermal oxidizer to blow down the pipeline within a short period of time. After destructing the remaining gas in the line with the EMTOS unit, four volume line sweeps were performed to leave the piping free of residual gas. After the blow-down, the customer could reroute the interconnecting piping, hydrotest the new portion and recharge the lines back up to 400 PSI.

Benefits
Due to Envent’s sound planning and efficient engineering approach, the pipeline company could finish their modification on schedule and safely in environmental compliance of the local air board. A great saving was achieved when the downtime was reduced by Envent operations.

Four volume line sweeps were performed to leave the piping free of residual gas.

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