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The MAN developed ME-GI pump vaporizer unit
(PVU) is a standardized compact, high quality pump unit for supply of LNG to
MAN B&W two-stroke ME-GI engines. The pump unit includes pump, vaporizer,
filters and a control system with safety functions and a high degree of
integration with the MAN B&W ME-GI engine.
The PVU is designed to pressurize and
vaporize the LNG to the pressure and temperature required by the MAN B&W
two-stroke ME-GI engine.
The PVU receives subcooled LNG supplied by a
cryogenic centrifugal pump and the LNG is pressurized by a high pressure
reciprocating pump, consisting of three cylinders actuated by linear hydraulic
pistons. The pressurized LNG flows through a compact printed circuit heat exchanger,
where it is heated by warm glycol water.
Fine particles present in the gas are caught
by the high pressure filter, before the gas is directed towards the gas valve
train (GVT) and the engine. The gas pressure is controlled by control of
hydraulic flow to the pump.
The separate control of the three pump heads provides
With a compact and intelligent design, the
PVU introduces a considerable saving in the complete low flashpoint fuel supply
system (LFSS). This is because of the simplifications implemented in the
design, resulting in a reduced number of sub-systems and components and due to
the cryogenic pumps being actuated individually, enabling embedded redundancy.
This means that one pump cylinder can be taken out of service for overhaul, while
the remaining two are fully operational, and can supply 100% of the required
capacity. In comparison, traditional crankshaft driven pumps require two
complete units to allow system redundancy. By choosing hydraulic supply for the
PVU from the ME-engine HPS, the installation cost is further reduced
The PVU control system is designed based on
knowledge of the ME-GI engine and the PVU mechanics. This ensures dedicated
control integration between the systems, and high gas supply control accuracy and
condition monitoring features. The engine gas pressure and flow demands are
quickly transferred to the PVU, resulting in a stable gas pressure control, in which
it secures efficient ramp up and ramp down in all operating conditions.
Further, the GVT downstream of the PVU is controlled by the ME-GI engine
control system, ensuring integrated control with the ME-GI engine. The PVU
control system is based on the same hardware platform as the ME engine control
system, which means that no extra spare parts are required.
Feb 06, 2018