Tritech Merlin, Руководство по эксплуатации продукта

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Merlin
0711-SOM-00001, Issue: 03 13 © Tritech International Ltd.
4. Principles of Operation
4.1. Suction Operation
The Merlin pump is based on the principles of the annular eductor pump. It has a monoblock
configuration in which the eductor pump and power pump are contained within a common
body.
The power for the eductor section of the pump is provided by a stream of clean water driven
by the centrifugal impeller section.
Clean water is drawn into the inlet, passes through the impeller of the power pump and is
then injected into the main suction stream via the annular eductor nozzle.
The main suction stream can convey heavy contamination of sand, mud, gravel and drilling
debris.
The pump has a retro flush valve just behind the eductor. When this is closed (operating
cylinder extended) the power fluid is then directed to the suction nozzle. This feature can be
used to clear a blocked suction nozzle or to complete a deburial operation by removing the
sand and mud from around an object.
The optimum performance will be obtained with the nozzle pushed deep into the debris and
agitated gently. Where a great deal of debris is encountered it will be necessary to keep
withdrawing the nozzle.
4.2. Jetting Operation
The body of the pump contains a jetting valve. The purpose of the valve is to provide water to
the jetting outlet. The valve may be configured to maintain suction during jetting operations.
For normal dredging operations the jet valve should be kept shut.
Note
The Merlin can be setup to restrict flow through the jetting valve. To implement
this place the M8 x 16 SKT CAP (item 9) in one of the three holes in the housing
mounting plate (item 1 - see Appendix B, Merlin Assembly ).
• Hole 1 gives : ‘low jetting, high flow’
• Hole 2 gives : ‘medium jetting, medium flow’
• Hole 3 gives : ‘high jetting, low flow’