The Mini dredge has a high chrome iron impeller. High chrome iron impellers are usually only found in severe duty industrial slurry pumps because they are so hard they are expensive to machine. The top abrasion resistant impeller material is high chrome iron. The next level above cast iron is ductile iron. Cast iron is popular inexpensive material, and serves adequately for non-abrasive pump applications. You will find that most trash pumps have a cast iron impeller. The second most vulnerable component to abrasive wear is the impeller. Our seal spring is tucked away in a recess machined in the pump housing, sealed away from abrasives and debris. Lazy pump manufacturers, leave that spring exposed in the water way behind the impeller, rendering it vulnerable to abrasive wear and to collecting stringy material & debris. Also, in order for mechanical seals to work, they all utilize a stainless steel compression spring to hold the seal faces together. Our seals have a large inside diameter with a lot of space between the seal and the shaft preventing seal damage from shock. When a hard piece of debris (rock, wood, etc) hits the pump impeller, it deflects the shaft momentarily and fractures the seal. Small diameter seals fit snug on the drive shaft. We also make the seal much larger in diameter than those found in most “trash pumps”. Silicon carbide is a premium seal material that is utilized in most industrial grade pumps. The Mini dredge pump is equipped with an oversized silicon carbide shaft seal. ![]() A leaky shaft seal will disable your pump completely, by allowing air to enter the pump case instead of water being drawn up the suction hose. The shaft seal is the component that seals the engine shaft as it enters the pump case. Carbon/ceramic is the cheapest seal material there is and is a strong indication that your pump is designed to pump water only. Cheap trash pumps usually utilize small diameter carbon/ ceramic shaft seals. The agitator water jet system is necessary to deliver kinetic energy (energy of motion) to the sediment to take it from a solid state rendering it a fluid slurry.Ĭheap trash pumps are not designed to withstand abrasion or shock. Please allow at least two hours between the time your land excursion begins or ends and your flight.First of all, a self priming pump alone is not very effective in removing sediment. Guests need to make sure they do not reserve Land Excursions on the day of cruise tour arrival or departure that will conflict with their air schedules. Have your gold turned into a memorable keepsake while you enjoy complimentary coffee and fresh homemade cookies before boarding the train for the return back to the station. Once the train arrives at the camp, local miners will give a brief but informative course in mining, and then you will try panning for yourself! You will find gold- we guarantee it! Nothing beats the thrill of grabbing a sack filled with pay dirt and getting your chance to strike it rich.įinally, explore the dredge camp and visit the gift shop where you can have your gold weighed and find out the dollar value based on the current market price. The train ride takes you to Gold Dredge 8, a National Historical Monument, where you will see first hand how the dredge worked the gold fields. ![]() As the train chugs out of the station, the conductor will play songs from days gone by and tell tales of prospectors who arrived by the thousands during the gold rush. Then you and your family hop aboard the hand-built replica of the narrow-gauge Tanana Valley Railroad that delivered supplies to the gold mining camps scattered throughout the area in the early 1900s. Be sure to read the Special Notes further down this page for important requirements and restriction.īefore you board our train, enjoy a close up view of the TransAlaska pipeline and a presentation about the history and operation of the pipeline.
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