Application of Safety Instrumented Systems in Liquified Natural Gas (LNG) Processes

At first glance, one might assume that Liquefied Natural Gas (LNG) processing is simply a compression process. Deeper observation reveals unique process challenges of flammable and explosible materials, high-pressure rotating equipment, and cryogenic conditions. LNG facilities are typically developed by connecting highly specialized process units designed and constructed by technology providers. Establishing a consistent and effective Safety Instrumented System (SIS) philosophy across the entire facility requires careful thought and negotiations to align all technology providers to the same page. This paper will highlight some of the project management concerns when working with packaged equipment through a study of some specific Safety Instrumented Function (SIF) examples.