EXCESSIVE MOVEMENT SENSING SYSTEM
The MIB gas transfer system also includes a ‘Ships Excessive Movement Sensing System’ which integrates the input devices for the automatic release of the hoses in case of occurrence of an emergency or critical situation during the transfer operation, such as loss of mooring lines or fire onboard, etc.
The Excessive Movement Sensing System, also known as 3-wire positioning system (3-WPS) is a very simple to understand solution which provides 3 levels of alarm (pre-alarm, first alarm – ESD1, and second alarm – ESD2) each associated to the three different wires’ lengths.
The system is fully integrated with the ship’s IAS and ESD systems. The ‘Pre-Alarm’ alerts the vessels’ crew of a possible impending problem, such as vessel seperation, etc. The ESD1 signal generally triggers the cargo pump shutdown, the closure of deck manifold valving and so on. Finally the ESD2 signal activates the closure of the ERS double valves followed by the disconnection of the ERC – thus releasing all hoses from the vessel manifold simultaneously and in a safe way.