How to Design the Emergency Relief System

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DÜPERTHAL Sicherheitstechnik GmbH & Co. KG

Effective process safety and risk management starts with understanding the hazards that are present in the process. Process Hazard Analysis (PHA) should be conducted throughout the life of a process from initial laboratory trials, through operation, until the process is decommissioned.

At different stages of a process life cycle, different PHA techniques may need to be used. Various current techniques used for conducting PHAs are: Preliminary or Inherent Hazard Analysis, HAZOP studies, Failure Modes and Effects Analysis and Emergency Relief System (ERS) Design.

Emergency Relief System Design

Emergency Relief System (ERS) design is an essential part of process safety management and keystone in achieving process safety. Effective ERS design helps companies meet risk-management goals, compliance requirements and sound business practices. DIERS (Design Institute for Emergency Relief Systems) Technology is an example of good engineering practice for process safety management of highly hazardous chemicals.

There are several software like SuperChems, ioXpress, which are used for conducting risk screening, documenting PHAs and conducting hazard assessments. These tools are essential for any plant manager with safety or risk management responsibility. Legal compliance requires process expansions or modifications of relief system design documentation up to date, and non-conformity of the same results in costly fines. Relief and flare systems are affected by processing modification, expansion, debottlenecking and other changes, and documentation must be updated accordingly. Using software tools such as SuperChems, one can perform sizing calculations, account for header and flare stack hydraulics, and calculate the radiation effects due to flaring....

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