Pressure transients in piping systems occur whenever there is a change in fluid velocity. If this change is large enough, the pressure wave produced can exceed the Maximum Operating Pressure (MOP) of the system. Canadian and US regulations allow liquid petroleum systems to exceed the MOP under abnormal operating conditions however these surges cannot exceed 110% of MOP even for short periods of time. As part of meeting these regulations, the authors have applied complex computational modeling tools, developed methodologies, and company standards to identify sources of pressure surges, with the ultimate purpose of providing protection solutions useful for mitigating overpressures in oil injection facilities with low rated piping. These computational models and identification methodologies are based on a) abnormal operating conditions recorded in the past, b) potential worst case scenarios of terminal transients, and c) are particularly sensitive to input data such as piping characteristics, fluid types, and the initial states of the operating system. Our paper discusses the above mentioned transient simulation methodologies and their importance in meeting regulations.

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