Emergency Isolation Valves (EIVs) are commonly provided at pump suction for butane and more volatile products and also for liquids handled above auto-ignition temperature. This practice of providing EIVs at pump suction is however, not widely followed for flammable liquids, particularly those operating at elevated temperatures as in many refinery units. The scope of this paper is to review the requirement for EIVs in such applications, considering the processing conditions, plant piping configurations and the hazards associated with such liquid releases. The paper draws on the authors' experience and observation from various plant design on different plant configurations.
