مهندسی شیمی

Changes to a flare header system can run in the millions. Flare QRA systematically evaluates the risk associated with relief headers and flare systems and helps reduce the costs associated with the perceived need to retrofit existing headers or construct new ones.

While PPM® includes baseline flare calculations and can provide a worst-case estimate of the safety of a multiple unit header system, Flare QRA delivers a more realistic analysis of scenarios involving multiple units.

Flare QRA uses data from the PPM® database, standard statistical analysis and Monte Carlo methodology to provide an objective assessment of the risk associated with multiple releases to relief header and flare systems (global scenarios). This is accomplished by accounting for existing layers of protection in the facility that would serve to reduce or eliminate relief loads, as well as the expected frequency of the global scenario.

Applications:

• Installation of additional processing units that are routed to an existing relief header and flare system
• Implementation of debottlenecking projects or increased plant throughputs
• Routing one relief header to another flare to facilitate flare maintenance
• Identification of “new” global scenarios based on plant experience

Key features:

• Systematic evaluation of all layers of protection present to reduce relief loads
• Accounts for expected frequency of global scenarios
• Provides direct link between relief scenario and vessel overpressure
• Applicable to relief header hydraulics, flare radiation, and liquid separation equipment
• Evaluation of risk associated with individual equipment/relief header system as a whole
• Relational database structure facilitates maintenance of the model