pertaining to the technology of the process should include at least the following: A block flow diagram or simplified process flow diagram Process chemistry and its properties Maximum intended inventory Safety upper and lower limits for such items as temperatures, pressures, flows or compositions An evaluation of the consequences of deviations, including those affecting the safety and health of the employees Information pertaining to the equipment in the process should include the following: Materials of construction Piping and instrument diagram (P&IDs) Electrical classification Relief system design and design basis Ventilation system design Design codes and standards employed Material and energy balances for processes built after May 26, 1992 Safety system (for example, interlocks, detection or suppression systems) The employer should document that equipment complies with recognized and generally accepted good engineering practices (RAGAGEP). For existing equipment designed and constructed in accordance with codes, standards or practices that are no longer in general use, the employer should determine and document that the equipment is designed, maintained, inspected, tested and operating in a safe manner. Compliance A process includes any group of vessels which are interconnected or separate and contain Highly Hazardous Chemicals (HHCs) which could be involved in a potential release. A process safety incident is the "Unexpected release of toxic, reactive, or flammable liquids and gases in processes involving highly hazardous chemicals. Incidents continue to occur in various industries that use highly hazardous chemicals which exhibit toxic, reactive, flammable, or even explosive properties, or may exhibit a combination of these properties. Regardless of the industry that uses these highly hazardous chemicals, there is a potential for an accidental release any time they are not properly controlled. This, in turn, creates the possibility of disaster. To help assure safe and healthy workplaces, OSHA has issued the Process Safety Management of Highly Hazardous Chemicals regulation (Title 29 of CFR Section 1910.119) which contains requirements for the management of hazards associated with processes using highly hazardous chemicals." Any facility that stores or uses a defined "highly hazardous chemical" must comply with OSHA's process safety management (PSM) regulations as well as the quite similar United States Environmental Protection Agency (EPA) Risk management program (RMP) regulations (Title 40 CFR Part 68). The EPA has published a model RMP plan for an ammonia refrigeration facility which provides excellent guidance on how to comply with either OSHA's PSM regulations or the EPA's RMP regulations. The Center for