|The Advantages of
The fixed transfer
system and pumping station can be fully automated and controlled by a programmable logic
controller for remote operation and monitoring. A magnetic flow meter in conjunction with
a nuclear densitometer, interface with the PLC to provide continuous monitoring and
recording of transferred sand volumes.
The transfer system operates according to control sequences programmed into the PLC. It
is intended the system will only be operated manually when required for equipment testing
All external commands are entered through a keyboard attached to the operator interface
computer and all system parameters are displayed on the computer's monitor. System alarms,
operatingdata and production reports are printed on the printer attached to the computer.
When all the deposited sand over the Sand Shifter has been recovered, or if the
operation reaches a pre-set stop time, the system is flushed and shut down. After each
operating period a production report is printed summarising the major parameters of the
The fully automated system utilises electrical power and operating costs are minimised
by programming the system to operated using off-peak power. The system does not require a
dedicated operator, only a System Supervisor to implement maintenance schedules, input
operating start times and file production reports.
The Submarine Sand Shifter method of permanent sands bypassing, offers a number
of environmental advantages not available to conventional dredging.
The system does not allow sand to accumulate, the sand is bypassed at a rate equal to
the nett longshore drift. Sandplumes are not generated and the regular volumes of sand
transferred are not sufficient to inundate marine habitats.
Under Australian legislation the operation of the bypass system would not be considered
dredging, hence dredging consents or authorisation to dispose of material at sea may not
Operating on electricity, there are no atmospheric emissions or fuels that could pose a
spillage problem. Noise from the electric motors powering the pump is minimal and
contained within the pump enclosure.
The Submarine Sand Shifter unit and supporting hoses are buried beneath the sea floor
and do not obstruct navigation. The control room and pumping station are the only
facilities visible, and are designed to blend in with their surrounds.