November 2005

Special Report: Plant Safety and Environment

Applying safety instrumented systems to raw natural gas complexes

Safety transmitters provide a higher level of protection than conventional instruments

In the production of gases from natural gas wells, safety instrumented systems (SISs) can protect critical piping and dehydration processes from high pressures, while minimizing the risk of undesirable emissions. Raw natural gas commonly contains varied concentrations of methane, carbon dioxide, hydrogen sulfide, nitrogen, helium and water at high pressures. The raw gases contain both free and entrained water; dehydration systems remove the water. Removing water. Dehydration facilities typically collect the raw natural gas from multiple wells that are miles apart (Fig. 1). Their purpose is to minimize the corrosive nature of the gas. Following dehydration, the gas goes to a plant that

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