Southwest Shipyard LP
In 2009, the Southwest Shipyard LP facility, located in Channelview, Texas, reduced Volatile Organic Compounds (VOCs) emissions from marine barge cleaning operations by approximately 49 tons. Approximately 51 percent of this reduction, approximately 25 tons, was the direct result of an operating procedure change related to barge venting and vapor capture initiated in early 2009. While operating a facility in a non-attainment county in Texas, reductions in VOCs emissions from business activities are critical to improving the environment.
Southwest Shipyard LP operates two (2) flares at the site for the purpose of VOC destruction, Barge Cleaning Flare 1 and 2. According to the air permit issued by the Texas Commission on Environmental Quality, all vapor emitted from a barge containing a chemical listed in specific attachments to the permit must be routed to a flare or carbon adsorption unit during degassing operation for vapor destruction. Additionally, the connection to the flare or carbon adsorption unit must be maintained until the concentration for the chemical being degassed is no greater than the limits specified in the attachments prior to the barge being allowed to vent to the atmosphere. Minimum degassing levels in ppmv for the compounds to be routed to the flares range between 10,000 and 50 ppmv. In order to reduce the amount of VOCs being emitted from the facility, the company changed the Standard Operating Procedure for degassing barges as follows in routing required compounds to the flares: All compounds required to be routed to the flares during barge degassing will continue to be routed to the flare venting system until the concentration of the chemical be degassed is less than 50 ppmv. As a result of implementing the changed SOP, the facility has successfully reduced the amount of VOCs being emitted by approximately 25 tons.
Details of Reductions
Additional Information :
An additional benefit of this project is a reduction in potential emissions of Benzene from the site. The site is located very near the Lynchburg Area Monitor. In the past, elevated benzene levels recorded at this monitor station have resulted the area being designated on the Air Pollutant Watch List for Benzene. Recently benzene was removed from the Air Pollutant Watch List (APWL) for the Lynchburg area. Reductions in benzene emissions due to this project may have contributed to the reduction achieved.