This paper describes the efforts involved in successfully designing a large scale offshore liquid fuel unloading system. The hydraulic transient analyses conducted during various design stages produced acceptable transient pressures under various transient events including pump trip, normal and emergency shutdowns (ESDs), confirmed that the maximum marine tanker design rail pressures were within limits, and determined that the transient pulse loading on various above-ground pipe segments can be substantially reduced by providing effective surge relief devices. The paper also describes experience gained in designing and maintaining the air vessels to ensure their availability in protecting the system piping.

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