The convoluted cylinder bellows "HG Power Plant" is reinforced from inside and out making the operation more like a "rocking" piston pump. The Model 625 Hand Dredge, works like a typical recreational suction dredge, only the suction is direct and not dependent upon a power jet venturi that seeks to produce a more constant vacuum. On average, siphons 1625 gallons per hour (27+ gallons per minute), and simplifies siphon dredging by serving as the priming device to keep the siphon alive. Adding extra hose is recommended, or upgrading to 2" hose to minimize 1 1/2" plug ups. Compare that to the world famous TV vacuum cleaner commercial that used a 16 pound bowling ball to prove their product and that was with a 6" cone so that created a larger area to apply vacuum over, still experts place the water lift of that vacuum at 65", so the model 625 is twice as powerful.ĭuring the pump down phase, the slurry of sand, gravel, and gold that was on the way up the intake pipe may loose momentum and begin to fall back, but a rapid succession of pump strokes will keep it moving towards the pump virtually walking the dredged material all of the way up and into the pump. Model 625's can pump over 25 gallons of water per a minute. If this calculation is right that 11.2487 lbs.would be a lot of weight that could be held to the end of the 1.71 I.D. PVC pipe, yielding 55 cubic inches or 30 1/2 fluid ounces.ġ atmosphere (29.92 inches mercury) = 14.695948775 pounds per square inchĤ.898 psi x 2.29658 sq. It was equipped with 24" of class 200 1 1/2 in. The Model 625 was tested using a vacuum gage and regularly achieved and held a -10 in/hg, that's more than 1/3 of an atmosphere. Pulling the handle can more than double the mechanical force of the incomming water when compared to siphoning and improves the potential for gold recovery from cracks and crevices. With a single elongation stroke of the HG Power Plant, the M625 hand powered suction GOLD dredge is capable of producing enormous suction at the intake nozzle attributable to it's sealed chamber construction. Model 625 HDPBHD Hand Dredge with the Experimental Gravity Trap GOLD Concentrator
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