Shackelford, AE, Extension of the Relational Database to Common “Global” Scenarios, MKOPSC Symposium, (October, 2003).
The key to creating and maintaining comprehensive pressure relief system information is the relational database predicated on an equipment-based approach for individual overpressure scenario analysis and relief system design basis documentation. This method is based on the evaluation of all potential overpressure scenarios for a piece of equipment, regardless of the presence or absence of a pressure relief device. With the information for individual overpressure scenarios managed in a relational database, a logical extension can be applied to the common, or ‘global,’ overpressure scenarios with multiple releases to an effluent handling system. An effluent handling system should be designed to manage these ‘global’ scenarios adequately, and the design basis must be well documented. To ensure OSHA 1910.119 compliance, the information for the effluent handling design basis must be kept in a maintainable format. The relational database ensures both constraints are satisfied.
This methodical equipment-based approach is expanded to further define the process for designing or analyzing a pressure relief system to meet OSHA 1910.119 Process Safety Information (PSI) and Process Hazard Analysis (PHA) mandates. The method broadens the use of a relational database to include the relationships among the point sources of releases during a ‘global’ scenario, the effluent handling equipment, and the effluent handling networks. With the comprehensive pressure relief system information, the process safety manager can extend the scope of safety analysis to properly quantify and address the risks associated with a process.