Page "Oil refinery" Paragraph 82

Materials methods include selecting the proper material for the application.

In areas of minimal corrosion, cheap materials are preferable, but when bad corrosion can occur, more expensive but longer lasting materials should be used.

Other materials methods come in the form of protective barriers between corrosive substances and the equipment metals.

These can be either a lining of refractory material such as standard Portland cement or other special acid-resistant cements that are shot onto the inner surface of the vessel.

Also available are thin overlays of more expensive metals that protect cheaper metal against corrosion without requiring lots of material.