Definition - What does Eliminator mean?

An eliminator is a device that is used to remove air and gas from upstream and midstream equipment. It removes oxygen and various other dissolved gases from a boiler feedwater system. This removal is important as the dissolved oxygen present in the boiler feedwater causes corrosion damage to the steam systems. Carbonic acid is formed when dissolved CO2 combines with water which causes further corrosion. Sometimes, eliminators are also known as deaerators because they function in a way similar to deaerators.

Petropedia explains Eliminator

Eliminators are used to protect steam systems from the harmful effects of corrosive gases. They accomplish this by lowering the concentrations of dissolved carbon dioxide and oxygen to a level at which corrosion is minimized. The design of an effective system is based on the amount of gases that are to be removed and final desired concentration of oxygen gas. They use steam for heating water to full saturation temperature to correspond to the steam pressure in the eliminator and carry away the dissolved gases. The flow of steam can be parallel, counter or cross to water flow. These devices are designed to reduce the oxygen level down to 7ppb by weight or less, and eliminate carbon dioxide as well.

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