PIPENET has various applications in LNG industry. It is widely used all around the world on major LNG projects. One of the important applications of PIPENET Transient module is to model LNG loading systems in order to analyze potential pressure surges and cavitation and to suggest ways of eliminating these problems.

In our new application bulletin – Modelling LNG Loading Systems – we illustrate the use and benefits of PIPENET Transient module in mitigating potential pressure surges and cavitation in LNG loading systems. A number of scenarios are considered before arriving at the optimum philosophy of operation.

In particular, we consider the following two aspects of the normal shut down of the system. The simulations pinpoint the strategy for eliminating pressure surge problems.

  1. The pressure surge upstream of the shut off valve.

2. Cavitation in the loading arm.

Scenarios which were considered include various combinations of the following phenomena:

  • Shut down of the pump
  • Opening of the bypass valve
  • Back pressure at the tank
  • Closure of the tank valve
  • Higher elevation of the loading arm

In all the cases the shut off valve closes.

The document shows why it is essential to perform pressure surge analysis when designing LNG loading systems. The results of the simulations suggest that it is important to shut down the loading pumps and open the bypass valves. It is also important to have a back pressure at the end of the system. However, depending on the design and layout of the system it may be necessary to take other surge alleviating measures.

Read the complete application bulletin here