Marathon Oil Company - Cotton Valley Gas Plant - Executive Summary |
|
26789 LDQ Facility ID Number COTTON VALLEY GAS PLANT RISK MANAGEMENT PLAN EXECUTIVE SUMMARY ACCIDENTAL RELEASE PREVENTION AND RESPONSE POLICIES The Cotton Valley Gas Plant (CVGP) has a long-standing commitment to safety as evidenced by over fifty years of no significant releases or failures. Preventative maintenance programs and systems are in place to reduce the potential for undesirable events. Emergency response plans and procedures are in place to handle problems if they arise. This Risk Management Plan (RMP) identifies potential release scenarios, safeguards and emergency response procedures. CVGP: DESCRIPTION AND REGULATED SUBSTANCES The CVGP is located just south of Cotton Valley, LA. The plant processes natural gas and condensate. Six systems process the incoming hydrocarbons; inlet separation and compression, condensate stabilization, amine system, dehydration, cryogenic system, and the fractionation train. Regulated flammable materials in natural gas such as metha ne, ethane, propane, butane, and pentane are present at the plant. Chemicals are utilized at the gas plant, however the type and quantity at the CVGP are not regulated as toxics under the RMP program. OFFSITE CONSEQUENCE ANALYSIS RESULTS An offsite consequence analysis was performed for a worse case release scenario for flammable substances, since the CVGP is a Program One facility. The CVGP is considered one process due to the close proximity of process vessels and storage areas. Therefore, one scenario is presented for a worse case release. Worse Case Scenario (WCS) The WCS for a flammable release was determined to be a vapor cloud explosion of a propane storage tank. The safeguards in place to prevent an accidental release from this tank make this release scenario far from probable. Regardless of the safety systems in place, the release scenario has been developed for the worse case "what if" scenario for the CVGP. Under the RMP regulations, a WCS for flammable substances must consider a vapor cloud explosion event. An end point based on a one psi overpressure is required. A vapor cloud explosion involving the pentane tank could possibly affect a 0.12 mile radius around the tank. Alternate Release Scenario (ARS) No ARS is required since the facility is Program One FIVE-YEAR ACCIDENT HISTORY With respect to flammables regulated under RMP, the CVGP has an excellent record of accident prevention over the past five years. No offsite events occurred during this time period. The only onsite event occurred in 1997 and resulted in a contractor injury. All events are investigated to determine ways to mitigate accident potential. Appropriate steps are taken to maintain safe and environmentally sound operations. EMERGENCY RESPONSE PROGRAM INFORMATION An Emergency Response Plan is maintained to protect worker and public safety, as well as the environment. This plan has been designed to address response to all emergencies including the WCS. Response s trategies include detailed procedures for notification of employees, management, responders, and the public of an emergency situation. Communication, control of any releases, safety measures, and post incident recovery are included in the plan. Phone numbers for medical facilities are included as well as pertinent Material Safety Data Sheets (MSDS) that identify safety and medical information. The plan has been coordinated with local response organizations such as the Webster Parish LEPC, the Cotton Valley Fire Department, and the Webster Parish Sheriff's Office. The Cotton Valley Fire Department will coordinate fire department response. The sheriff's office will contact residents in the area and control access to the site. Personnel are trained on the aspects of the plan at least annually. A schedule for performing emergency response drills as well as coordination of periodic drills with local responders is discussed in the plan. The plan is reviewed and updated at least annua lly. PLANNED CHANGES TO IMPROVE SAFETY No particular changes are planned at this time. However, safety policies and procedures are continually reviewed and updated in order to improve safety. |