This can be caused by dredging an excess of sand, causing the suction hose to load up, or a rock that has become stuck in the suction system. The suction system can become jammed while dredging. It is important to ensure that no air leaks occur in the suction system. The suction will commence as soon as the air is passed through the system. When the tip of the suction hose is taken out of the water during operation air will to enter the suction system and cause the suction power to cease temporarily, until submerged again. Priming the suction hose need not be of concern in most dredging operations, but is important to understand the principal.
VENTURI DREDGE PUMP FREE
It is recommended that the intake portion of the foot valve be placed in a sand free environment underwater, such as a small bucket or pan. Excess amounts of sand could dam age the water pump seal, or pump impeller. Caution must be exercised to prevent sand from entering the foot valve or intake portion of the pump. The larger dredges that have a rigid foot valve, are easily primed by removing the cap provided on the foot valve and filling, until water overflows. It sometimes may become necessary to hold the discharge hose above the level of the pump to complete the priming operation. A pump is fully primed when water is observed flowing out of the discharge end of the pump. This will cause water to become pumped into the foot valve assembly into the pump. Priming the pump on some of the smaller models is accomplished by thrusting the foot valve back and forth under the surface of the water in a reciprocating motion. Without the presence of water in the pump, friction could cause a seal to overheat and require replacement. All jetting pumps provided with our dredges have a mechanical water pump seal.
VENTURI DREDGE PUMP FULL
This means the pump must be full of water and all air removed. Normal conditions require a sluice box to be cleaned only once or twice a day.īefore starting the engine, the pump must be fully primed. This continuous self cleaning principal allows a dredge to be operated for prolonged periods of time. This force allows the heavier material to settle out of suspension and the lighter, non value bearing material to be washed away. As material flows over the riffles a eddy current is formed between each riffle opening. This type of riffle has proven to be the most efficient gold recovery system. The riffles, or gold traps in the sluice box are best described as "Hungarian Riffles". The lighter non bearing values and larger aggregate are returned back into the water. Often values are recovered and easily observed before they even enter the riffle section. The smaller and heavier particles drop below the classifier screen into an area of less velocity, allowing a slower and more selective classification of values. As a slurry of water and gravel enters the header box and is spread evenly over a classifier screen. As indicated in the diagram gravel is dredged into the suction hose and is delivered to the sluice box header. A high velocity jet stream is created within the jet tube producing a powerful vacuum. A volume of water is pumped through a tapered orifice (jet), by a special designed water pump.
VENTURI DREDGE PUMP PORTABLE
The vacuum on a portable dredge is created by a "venturi principal". THE FOLLOWING INFORMATION SHOULD ENABLE YOU TO UNDERSTAND THE BASIC THEORY OF OPERATION OF A PORTABLE DREDGE.įor more complete understanding on this subject, we recommend you read any one of a variety of books available through the Library of Books, such as The Gold Miners Handbook, Dredging for Gold or Advanced Dredging Techniques. GOLD DREDGE OPERATING INSTRUCTIONS - courtesy of keene engineering. Home > Gold Mining Equipment > Black Sand Magnets (Gold Magnet) > Black Sand Gold Recovery - Part 2 > Black Sand Concentrates > Fine Gold Recovery Equipment > Gold Prospecting - FREE TIPS > Panning For Gold > Gold Prospecting EQUIPMENT (SEE ALL) > Proline Gold Dredges > Diving Equipment > Gold DREDGES for Sale - Keene > Dredge instructions We offer many sizes and styles to choose from and maintain a good supply of various size hose clamps and couplings.Home > Gold Prospecting - FREE TIPS > Panning For Gold > Gold Prospecting EQUIPMENT (SEE ALL) > Proline Gold Dredges > Diving Equipment > Gold DREDGES for Sale - Keene > Dredge instructions We stock suction hoses for dredging, pressure hoses for powering dredges, and layflat hoses for highbanking use.
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