Definition - What does Dewatering mean?

Dewatering is a technique used to remove water from hydrocarbon streams. At times it is also used to remove excess water in industrial equipment so as to save them from corrosion. In dewatering, a surface treatment solvent which is designed for use in components and systems is used to remove water from bare metal surfaces.

It is designed on the basis of:

  • The substrate material
  • The surrounding conditions
  • The intention of protection
  • The time duration for protection (temporary or long-term)
  • The method of application (brushing, spraying, swabbing or immersion in a tank)
  • The compatibility with other treatments to be used on the surface
  • The nature of the film
  • The drying time.

Petropedia explains Dewatering

In any production activities, water is extracted from the earth's surface along with crude oil or natural gas. Before these highly valued hydrocarbons are sold they need to be processed, stabilized and conditioned. Once crude oil is stabilized, dewatering and desalination activities are performed that help in the removal of water molecules as well as fine solid particles.

With respect to corrosion, the dewatering corrosion preventives are made from hydrocarbons, non-volatile corrosion inhibitors, and chemically polar-active additives. This ensures that when the dewatering corrosion preventives come in contact with the surface of a metal, upon exposure to the atmosphere, they evaporate and leave the surface dry. In the end, what is left on the surface of the substrate is a thin protective greasy, waxy or oily film.

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