Abstract

Dynamic Computer Simulation is an effective tool for efficient design. It can be used to:

• Evaluate/design control systems

• Evaluate system behavior during emergency upsets

• Establish/verify startup and shutdown procedure

• Train startup and plant operators

This paper documents how dynamic simulation has been applied to three areas of a LNG operation. They are:

1. Centrifugal compressor systems

2. Integrated electric/steam utility plant

3. Gas gathering and condensate removal facility

In Area #1, the paper discusses the application of dynamic simulation to centrifugal compressor control system design. It presents case histories involving the design of anti-surge protection for large compressor systems. It documents how simulation is used to test and amend start-up procedures.

In Area #2, the paper discusses how simulation is used to design a pressure letdown control system. The simulation model is used to demonstrate how the utility plant would maintain steam and electrical balances during emergency upsets; e.g., compressor trips, trubine trips, boiler trips, etc.

In Area #3, the pressure behavior of a gas gathering facility during normal and upset conditions is determined by the performance of the pressure-flow control system. The paper discusses how dynamic simulation has been used to evaluate and redesign such control systems.

The paper concludes with a brief discussion of how a dynamic simulation model is developed.