Pressure relief system design aspects

First, the importance of learning lessons from past process safety incidents is highlighted in Section 3.2. The subsequent section presents preliminary hazard review procedure, risk matrix, what-if method, plot plan and layout review, pressure relief system review and fire safety design aspects. Section 3.4 presents PHA techniques and procedures hazards and operability analysis (HAZOP), failure modes and effects analysis (FMEA), instrumented protective system (IPS) design, fault trees, event trees, layer of protection analysis (LOPA) and finally SIS life eyele. The importanee of revision of PSI is highlighted in Seetion 3.5. 

Discharge of pressure relief systems and leaks . Although strictly not a category of waste distinct from those above, the design of a containment and treatment system for effluent must take into account the likelihood of the unexpected. Further consideration of these aspects is given later in this chapter. 

Many aspects of quench pool design (vessel, spargers, mechanical design loads, etc.) and operation are covered in Guidelines for Pressure Relief and Effluent Handling Systems (AIChE-CCPS, 1998), and it should be consulted when a quench pool has to be designed. 

Isolation valves are quite common at the inlet and outlet of PRVs. However, certain aspects need to be considered in designing the isolation system of a pressure relief valve. 

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