is fully automated using a programmable logic controller (PLC) and personal computer for
remote, unattended operation. Sand production rates are continuously metered via the uses
of a flow meter and desensitometer.
The harbour crossing pipeline is fully welded, heavy wall steel.
It is entrenched under the main shipping channel. Cathodic protection is
by sacrificial anodes at each end of the pipe. The on-shore pipeline is medium density
polyethylene and joined by victaulic couplings.
Production capacity is 70 - 150 cu.m of in-situ sand per hour.
SlurrySystems initially dredged 230,00 cu.m of sand accumulation using a mobile Sand
Shifter/Jet Pump combination while installing the permanent system.
The technology used for the Portland system is suited to service multiple
entrances as a road transportable system.
To date, all maintenance on th Portland units has been carried out by
divers, without the need for expensive supporting equipment or recovery of the Sand