LNG CARRIER MODEL (MEMBRANE CONTAINMENT)


 
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The LNG Carrier model (Membrane Containment) is based on a 138,000m3 vessel and comprises of four cargo tanks each containing two cargo pumps, a single spray pump, emergency cargo pump, load lines and spray rails. The construction of the interbarrier insulation spaces around the tanks have been carefully modelled to allow both the monitoring of the various temperature gradients within the system, and the effects of a leakage of cargo vapour into the spaces. 

Detailed description:

  • Cargo System - The cargo system of both types of model includes all the relevant pipelines for the movement of liquid and vapour around the vessel, together with connections into supplementary systems allowing all required operations to be conducted. The cargo manifold arrangement allows the operator to decide which manifolds should be used and connected to shore or atmosphere to allow loading / discharge operations or line purging operations to be conducted.
  • Vaporisers - Two vaporisers are incorporated, one for the supply of LNG vapour for “gassing up” and discharging purposes and the other for the supply of gas to the vessels boilers. All interlocks and alarms are provided as per the real vessel.
  • Compressors - Two high duty compressors are provided for the removal and circulation of LNG Vapour, along with two low duty compressors for the supply of boil off gas to the boilers. Full control mechanisms for the compressors are provided including automatic capacity control by adjustment of the inlet vane angle. Monitoring information includes the inlet and outlet pressures and temperatures together with flow.
  • Pump Controls - Automatic pump controls are provided which mimic the behaviour of the systems used on board the real vessels. Spray pump controls are provided with an additional controller to allow the required pressure to be maintained within the spray header to be set, and maintained for use when tank cooling or providing a supply to the Forcing vaporiser. Emergency Pump is also provided in each tank together with the appropriate equipment to allow the full installation procedures to be conducted.

  • Ballast & Auxiliary Systems - The ballast system comprises of two or three electric pumps for the supply and discharge of sea water ballast. A separate pump provides the supply to the stripping eductor. Connections are provided to allow the emptying of void spaces and to provide a supply to the Inert Gas Generator. 

 

The model incorporates all the systems associated with the cargo and those required for its operation. This allows the simulation of all the operations that are likely to be conducted on this type of vessel.