These compression devices are also adversely affected by the flare gas stream, which is often poor quality. For many facilities with an FGR system, one of the most common causes of unplanned flaring is due to the breaking-down or ‘tripping’ of FGR compression equipment, counter to its very purpose to reduce flaring.
However, due to their reliance upon moving parts in direct contact with flare gas, rotating equipment is prone to break-down. Traditionally, rotating-type compression equipment has been employed to compress low pressure flare gas including Liquid-ring, Screw, Sliding Vane or Reciprocating-type compressors. Most commonly, recovered flare gas can be used as fuel gas or returned to production, providing some commercial value to the Operator.Īs most flare systems operate at low pressures (close to atmospheric pressure), gas compression is required to increase the gas pressure to allow the recovered flare gas to be used as a fuel gas or returned to production. This involves recovering flare gas and diverting it away from the flare system to an alternative destination, thereby avoiding the need to burn the gas to atmosphere. However, outside of these emergency cases, many facilities also carry out continuous or routine flaring, where purge gas, waste gas and other low-pressure gasses are sent to flare to be burned to atmosphere.Īs the environmental and subsequent legislative pressures have increased over recent years, Operators are actively looking for low cost, reliable Flare Gas Recovery (FGR) solutions. In an emergency or similar process shutdown event where pressure relief is required, the flare system must safely and reliably handle and dispose of waste gas through burning it to atmosphere. A reliable flare system is an important part of most oil and gas facilities.
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