AGA Gas, Inc. - Executive Summary
1. The accidental release prevention and emergency response policies at the facility: |
The AGA Gas, Inc. (AGA) facility located in Twinsburg, Ohio complies with NFPA requirements for LP-Gas storage, and it is our policy to adhere to all applicable federal, state, and local laws. If an emergency accidental release were to occur involving our propane or acetylene storage/handling systems, it is our policy to immediately notify the Twinsburg Fire Department and the AGA emergency response team, who would respond to the emergency.
2. A description of the facility and the regulated substances handled:
The AGA facility manufactures acetylene, and stores propane in above ground storage tanks (ASTs). Both gases are put into storage cylinders of various sizes before they are sold and shipped from the facility. The propane storage/handling process consists of one 30,000-gallon propane AST, propane cylinder filling equipment, filled propane cylinders of various sizes, and associated piping,
valves, and other miscellaneous equipment. The acetylene manufacturing/handling/storage process consists of a low pressure acetylene generator and a high pressure cylinder filling area. The low pressure acetylene generator uses calcium carbide to generate acetylene gas that is purified and stored in a "gas holder". The acetylene that is generated in the low pressure generator is piped to the high pressure cylinder fill area where it is compressed and routed through manifolds that are used to fill multiple cylinders.
3. The worst-case release scenario:
The worst-case release scenario for the AGA facility considers the potential failure of the 30,000-gallon propane storage tank filled to 80% of it's holding capacity (administrative controls limit each storage tank to 80% of capacity at 600F), resulting in a vapor cloud explosion. Utilizing a computer-based version (RMP*Comp) of the methodology presented in USEPA's "RMP Offsite Consequence Analysis Guidance", USEPA, May 24, 1996,
the distance to the flammable endpoint (1 psi overpressure) was determined to be 0.4 miles. The public receptors affected under this worst-case release scenario include commercial, office, and/or industrial facilities and residential property. The residential population within this 0.4-mile radius is approximately 490 persons, which was estimated using an Environmental Data Resources - Offsite Receptor Report.
4. The alternative release scenario:
The alternative release scenario for the AGA facility considers the potential release of propane from a 100-pound capacity storage cylinder (i.e., caused by a cylinder being knocked over, resulting in the cylinder valve being broken off), resulting in a vapor cloud explosion. The release rate of propane from the cylinder was estimated to be 1.67 pounds per minute. It was assumed that the release occurred for a duration of 60 minutes. Therefore, the alternative release scenario modeled a release of a total of 100 pounds of propane. Util
izing RMP*Comp, the distance to the flammable endpoint was determined to be 0.02 miles. The only affected public receptor under this alternative release scenario is an industrial facility. There is no residential population within this 0.02-mile radius.
5. The general accidental release prevention program and chemical-specific prevention steps:
The AGA facility complies with USEPA's accident prevention rule and all applicable federal, state and local codes and regulations. The propane and acetylene systems are designed, installed, and maintained in accordance with NFPA and state law at the AGA facility in Twinsburg, Ohio.
6. Five-year accident history:
The AGA facility has never had an accident involving its propane or acetylene processes.
7. The emergency response program:
In the event of an emergency accidental release involving our propane or acetelyene storage systems, it is AGA's policy to immediately notify the Twinsburg Fire Department and the AGA emergency response t
eam, who would respond to the emergency. We have communicated this policy with the Twinsburg Fire Department. All members of the AGA emergecy response team are properly trained to respond to emergencies at the facility. All employees have access to AGA's emergency action plan, and emergency response training is conducted annually.
8. Planned changes to improve safety: NONE