March 2011

Special Report: Corrosion Control

Flare stack structure revamp: A case history

An innovative approach was used to repair an older flare structure online without an extensive shutdown

Singh, S., Reliance Industries Ltd.

A gas flare, alternatively known as a flare stack, is an elevated vertical conveyance that is part of installations such as oil and gas wells, oil rigs, refineries, chemical, petrochemical and natural gas plants, and other facilities (Fig. 1). On oil- production rigs and in refineries and petrochemical plants, the flare stacks primarily serve to protect vessels or pipes from over-pressuring during unexpected plant upsets.     Fig. 1. Flare stack. Safety system. Whenever plant equipment is over-pressured, the pressure, relief valves on the equipment automatically release gases (and sometimes liquids as well) that are routed through large piping runs called flare head

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