Mertzon Gas Plant - Executive Summary
Mertzon Gas Plant Risk Management Plan: Executive Summary |
ACCIDENTAL RELEASE PREVENTION AND EMERGENCY RESPONSE POLICIES
The Mertzon Gas Plant has a long-standing commitment to the safety of the neighboring community as well as employees and contractors on plant property. Conoco, operator of the Mertzon Gas Plant, is dedicated to safety and environmental stewardship, which are two of the company's core values. Safety and protection of the environment are an integral part of Conoco's operations and corporate culture.
The Conoco Mertzon Gas Plant adheres to all Conoco policies, which can be summarized as follows with regard to safety and environmental stewardship:
7 All Safety and Environmental incidents are preventable.
7 The Goal is Zero - Zero Significant Incidents, Period.
7 All employees and contractors are responsible for their personal safety.
Conoco Corporate policies are embodied in the numerous Safety, Health, and Environmental Policies & Procedures which apply globally t
o Conoco operations. At the Mertzon Gas Plant, these policies are outlined and implemented via the Mertzon Gas Plant Safety, Health, and Environmental (SHE) Manual. This manual is available to all employees, and all employees have been trained in their specific responsibilities for Safety, Health, and Environmental compliance. In addition, the Mertzon Gas Plant complies with the Process Safety Management (PSM) Program requirements, which are managed and implemented via the Natural Gas and Gas Products (NG&GP) Process Safety Management Program manual. This manual is also available to all employees, and all employees receive specific training on Process Safety Management and their role in the program. The Mertzon Gas Plant also maintains an Incident Response Plan that details the complete Emergency Response program for the site.
The Mertzon Gas Plant's dedication to safety is demonstrated in many ways. The Plant and Conoco have a safety record that is consistently among the very b
est in the energy industry in the United States. To help ensure the safety of Conoco operations, the company invests significant resources in accident prevention. Accident prevention includes designing safe plants and operating facilities, conducting and providing safety training for employees and contractors, and developing and implementing safe work practices and procedures for the operation and maintenance of plants, processes, and operations facilities. Conoco's policies and dedication to safety and environmental stewardship help to prevent accidental releases. If, despite our best attempts to prevent such incidents, a release should occur, trained personnel will respond to, control, and contain the release in accordance with the plant's Incident Response Plan.
This document has been prepared in accordance with the EPA's new Risk Management Program (RMP) regulations (40 CFR Part 68), which were promulgated in the Federal Register on Thursday, June 20, 1996, Vol. 61, No. 120.
DESCRIPTION OF THE FACILITY AND THE REGULATED SUBSTANCES HANDLED
The Mertzon Gas Plant, located in Irion County, Texas, is owned and operated by Conoco Inc. Mertzon Gas Plant is a cryogenic natural gas processing plant which extracts hydrocarbon liquids from raw natural gas streams. The raw natural gas streams are delivered via pipeline to the plant from a local gathering system. After extraction of the hydrocarbon liquids, residue gas and these liquids are sold as product. The site consists of inlet gas separation, dehydration, cryogenic gas processing, compression, product storage and loading equipment. Products are transported from the facility via pipeline, and truck.
In accordance with the EPA's Risk Management Program (RMP) regulations (40 CFR Part 68), the Mertzon Gas Plant's inventory of chemicals was evaluated to determine if any regulated flammable or toxic substances were on the plant site in quantities above the threshold quantities. [Note: The term "threshold quan
tity" is the quantity above which the EPA has decided that the substance will be regulated.] Our evaluation determined that the following listed flammable substances are handled by the plant in quantities above the substance's threshold quantity: condensate, propane, and ethane/ propane/butane/condensate (EPBC) mix. [Note: condensate is exempt from threshold determination based on its National fire Protection Association (NFPA) rating of 3.] There are no toxic substances above the threshold quantity at the plant. Based on worst-case analyses of the regulated substances, the distances to endpoints (i.e. an overpressure of 1 psi) do not exceed the distances to public receptors (i.e., off-site residences, institutions, industrial, commercial and office buildings, parks, or recreational areas, inhabited or occupied by the public). In addition, the Mertzon Gas Plant has not had an accidental release in the past five years and emergency response procedures have been coordinated with co
mmunity response organizations. Therefore, the Mertzon Gas Plant is classified as a Program 1 process under the Accidental Release Prevention (ARP) Program.
WORST-CASE TOXIC RELEASE SCENARIO
The Mertzon Gas Plant does not have any toxic substances above threshold quantity. As the plant does not have any toxic substances, toxic release scenarios were not addressed.
WORST-CASE FLAMMABLE RELEASE SCENARIO
The RMP regulation requires the operator to model the worst-case release scenario, which the regulations define as the "release of the largest quantity of a regulated substance from a vessel or process line failure. For flammables, this hypothetical worst case assumes an instantaneous release and a vapor cloud explosion. These assumptions are required without regard to whether a scenario is realistic or improbable. Propane was used in the model for the hypothetical worst-case flammable scenario. The worst-case scenario was modeled on the assumption of the instantaneous release of
all of the propane in the largest propane vessel. Under the stipulated guidelines, this hypothetical release, if ignited, would have an off-site impact, as determined by the use of the OCA Guidance. [Note: The OCA Guidance is EPA's Off-Site Consequence Analysis Guidance document.]
Passive mitigation systems were not applied because of the assumption for the scenario that the entire contents of the vessel be instantaneously released. We believe that a vessel failure such as this is extremely unlikely because the vessels are carefully designed with significant engineering safety factors. In addition, all pressure vessels are carefully inspected and pressure tested before they are placed in service, and the Mertzon Gas Plant follows a rigorous Mechanical Integrity Program to ensure that all process equipment is properly maintained and inspected, to prevent leakage or failure.
GENERAL ACCIDENTAL RELEASE PREVENTION PROGRAM
Based on the criteria in 40 CFR 68.10, the distance to the s
pecified endpoint for the worst-case accidental release scenario for the following processes is less than the distance to the nearest public receptor: propane and EPBC mix. Within the past five years, the processes have had no accidental releases that caused off-site impacts as defined in the risk management program rule (40 CFR 68.10(b)(1)). No additional measures are necessary to prevent off-site impacts from accidental releases. In the event of fire, explosion, or a release of a regulated substance from the processes, entry within the distance to the specified endpoints may pose a danger to public emergency responders. Therefore, public emergency responders should not enter this area except as arranged with the emergency contact indicated in the Risk Management Plan. The undersigned certifies that, to the best of my knowledge, information, and belief, formed after reasonable inquiry, the information submitted is true, accurate, and complete.
THE FIVE-YEAR ACCIDENT HISTORY
eaths, injuries, or significant property damage on site, or known off-site deaths, injuries, evacuations, sheltering in place, property damage, or environmental damage have resulted from any activities or incidents at the Mertzon Gas Plant for the past five years.
THE EMERGENCY RESPONSE PROGRAM
The overall incident response program for the Mertzon Gas Plant is coordinated with the Mertzon Volunteer Fire Department and Sheriff's Department. This coordination includes periodic meetings of the Mertzon Gas plant personnel, fire chief, and sheriff. The Mertzon Gas Plant has around-the-clock communications capability with the Mertzon Volunteer Fire Department, and Sheriff's Department. This provides a method for notifying the public in the event of an incident, if necessary, as well as facilitating quick response to an incident. In addition to periodic meetings with the Mertzon Volunteer Fire Department and Sheriff's Department, the Mertzon Gas Plant conducts periodic emergency response
drills with the Mertzon Volunteer Fire Department and Sheriff's Department.