The standard Diving Equipment Specialties 4" diameter water dredge requires a minimum water pump of 350 GPM ( gallons per minute ) or more. Longer exhaust hoses are also possible, with the same caveat.
Greater depths are possible with longer supply hoses, but pressure losses due to hose friction may reduce performance. Full-power operation at depths of 60-150 ft is well within the capabilities of this dredge as supplied. Unlike air-powered dredges which require more HP to produce the necessary pressure and volume of air with depth, the Diving Equipment Specialties water dredge retains full effectiveness at any depth up to 150 feet, and is limited only by the length of the water supply hose. Suction head grips are fully adjustable for low-fatigue single-handed control. Water dredge suction head shown assembled to venturi elbow. A variety of user-selected configurations are possible and easily switched between, with the venturi elbow placed either at the suction end or the exhaust end of the dredge. A grate on the water intake prevents larger objects that could jam inside the tube from being drawn into the dredge. The strong suction created at the intake end draws up bottom sediments, which are ejected 15' away from the work site, far enough to avoid fall-back into the working hole and reduce clouding. This simple yet highly effective device works by injecting a high speed jet of water into the 4" main tube 4" of the venturi elbow, entraining a much greater stream of water inside the dredge. And since it is constructed of 100% stainless steel with no moving parts, it is practically indestructible and rust-proof, unlike other dredges constructed from lesser materials. Whether your goal is marine artifact recovery, salvage, or underwater construction, with a portable and affordable Diving Equipment Specialties dredging system you are in business. Stainless Steel Straight Twin Jet Water Dredge and swivel suction nozzleĭiving Equipment Specialties builds stainless steel water dredges for underwater digging and sells complete, turn-key underwater dredging systems for both private and commercial use.
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