The modern crude oil refinery is designed to convert basic raw crude oil into various useful products through a series of separation and chemical processes. Refineries consist of many different processes such as distillation units, fractioning towers, alkylation units, catalytic crackers, reformers and coking units. Fire is a constant and significant risk in oil refineries –one that demands effective fire protection system. By nature, many refining applications are severe services characterized by extreme temperatures, erosion, corrosion, and high pressure drops. With strict environmental requirements, process equipment must also restrict fugitive emissions to acceptable limits.