This was done with no bad breaks and few shut-downs. of discharge-pipe, gravel containing boulders up to 200 lb. worked for nearly four years at League Island, Philadelphia, where it sucked up, passed through the pump, and forced through 3,700 ft. The large dredge of the Henry Steers Contracting Co. In harbor-operations, much larger stones are handled by suction-dredges. in diameter are not frequently encountered. whereas there are few profitable gold-fields which can be considered dredgeable, in which stones more than 12 in. In suction gold-dredges, this diameter has not usually exceeded 10 or 12 in. In my opinion, all three causes of trouble may be remedied: the first, by making stronger the parts most liable to wear and breakage the second, by means for loosening the gravel at the intake and the third, by sufficiently increasing the diameter of the suction-pipe. The suction hydraulic gold dredges have failed from three special causes: excessive wear and frequent breakage of pump-shell, runners and liners inability to dredge compact gravel which would not readily move towards the intake and, most important of all, closing of the suction-pipe by stones too large to enter it. VORTEX removal rates are ACTUAL removal rates as seen with actual material moved using Magnetite black iron sand and rocks weighing 2.375kg per liter as to the sample product.Repeated failures in attempts to work gold-bearing gravels by means of suction dredges have created the impression that this method is impracticable. VORTEX performance figures DO NOT have a small print clause with an Asterix symbol next to figures which would represent "best case Scenario" removal rates as opposed to actual removal rates. Suction does the work and water flow continues the work done. Once the hose is clear then water flow takes over. Powerful, simple, effective.Įxample: Getting a "RIDICULOUSLY THICK MILKSHAKE" ® ™ to move through a straw is similar to dredging a very sticky seabed and suction is key because if you drive a suction hose deep into sticky mud the water flow in the suction hose will often stall and the hose is essentially filled with a 'plug' of mud and only high suction will clear the hose. Vortex dredges have been designed to combine high suction values and high water volumes to tear up sticky soils with very high suction then keep it flowing with high water volume.
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