11
2.2.3 Skid
assembly
Reference drawings
Dimensional drawing and parts list ballast skid Mark 6M
0806-1288
The skid assembly contains the necessary items to handle the sampled ballast water and to
measure the oil content. In the skid assembly there is a pneumatically operated shuttle valve (5),
and a window wash pump (1).
The shuttle valve (5) selects between fresh water, forward or backward flush and sample water.
Also contained within the skid assembly is the detector cell (6) which contains the electronic sensing
system to determine oil content. On the left hand side of the skid assembly is the window wash
pump (1). This is a pneumatically operated pump which provides a 1 to 10 pressure boost to the
window flushing water. Also included in the skid assembly is a flow shuttle valve (5), which sets a
back pressure on the sample pump and a magnetic flow sensor (3) to determine flow through the
skid assembly.
The skid assembly is normally mounted in the pump room opposite the EPU on the engine room
side of the bulkhead.
2.2.4 Pump/motor
assembly
Reference drawings
Dimensional drawing sample pump/motor Ballast Monitor Mark 6
0806-1076
Assembly drawing sample pump Ballast Monitor Mark 6
0806-1260
The pump/motor assembly comprise a high shear vortex pump, a gas tight bulkhead seal and a
motor. The pump provides a degree of sample water conditioning as the shearing effect tends to
produce droplets of oil of roughly similar size. The pump has a mechanical seal to provide sealing
on the shaft. This shaft fits directly on the motor shaft and is inter-connected by a lantern ring. The
shaft passes through a bulkhead seal, which consists of a number of rubber lip seals which are oil
lubricated to form a gas tight seal. The motor is directly bolted to the bulkhead seal. The motor is
suitable for 380V or 440V at 50Hz or 60Hz, runs at 2850rpm or 3420rpm respectively and is
constructed to IP55 and isolation Class F, IEC 34-1.
2.2.5 Flowmeter
system
Reference drawings
Installation flowmeter Ballast Monitor Mark 5/6
0806-8016
Bulkhead penetration and piping diagram Mark 6M
0806-8038
The flow of water through the orifice plate causes a pressure difference across the plate. This
differential pressure is converted into a mA signal and transmitted to the EPU by the dP/I
transmitter.
The manifold valve block fitted to the differential pressure transmitter, has three shut-off valves. The
two outer valves are for blocking off the pressure sensing lines from the sensor. The centre valve
serves as an equalizing valve to balance the pressure at both sides of the transmitter.
See drawing
0806-8038
(sheet 2 of 4) for configuration of the system.
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