Piranha Pumps & Dredges: dewatering, slurry, solids, floating pumps

Commonly asked questions

If I turn my dredge on in the morning and come back at the end of the day, will it have done my dredging for me? That is like asking, if I get in the back seat of my car, will it take me to work? Come on people, this is a piece of machinery that requires an attendant.

Here's another good one. I have an area overgrown with cattails. Will it chop up the cattails and dig up the roots? The answer is no. A $500,000 dredge would not do that. Dredges excavate sediment. That means sand, mud, decayed vegetation, sewage, gravel, shells, and virtually any type of sediment that is broken down into small particles that are not glued together. Dredges will not pump lily pads, moss, or any other stringy vegetation.

Will it pump leaves? The answer is yes, but there are some limitations. Our standard suction head has a strainer with 38 mm square holes the material must pass through before entering the suction hose. Leaves will have a tendency to collect on the strainer and starve the pump. We also offer a modified “leaf strainer” with 76 mm square holes. The “leaf strainer” allows a generous path for leaves to pass. However, it must be used with some caution. The standard strainer is designed to prevent large rocks, chunks of wood, etc, from damaging the pump. By utilizing the leaf strainer, you are eliminating this safe guard. Also, the dredge is intended to primarily excavate sediment with leaves scattered in the mix, and not the other way around. In other words, if you have clumps of leaves, or thick layers of leaves, you would be better off removing them by some other method.

What about clay? The term "clay" is actually a definition of particle size, although most people think of clay as gooey sticky mud that is difficult to wash off your shoes. An easy way to determine whether or not your material is suitable for the dredge, is to put a ball of it in a jar of water and shake it vigorously a few times. If it does not completely fall apart in the jar, then you are not going to be able to pump it.

How about using it in salt water? Salt water is fine but you will need to take extra care to hose the pumps and engines with fresh water after every use. The pontoon floats are made of high density polyethylene (HDPE), and are extremely resistant to salt, chemicals, and ultraviolet light. The frame has an oven baked urethane powder coated finish that is also resistant to corrosion and UV light. Also the pontoons are secured to the frame with stainless steel fasteners.

How long will my pumps last? That will depend upon the type of sediment you are pumping, and how extensively you use it. Sand is by far more abrasive than mud, and will wear your pump much more quickly. The key wear components in the dredge pump are made of highly abrasion resistant materials, are designed to withstand sand abrasion, and are relatively easy to replace with new parts. If you are utilizing it for intermittent cleaning of limited areas such as boat docks, waterfront, channels & canals, then you can expect it to run a long time before wearing anything out. On the other hand, if you are planning to pump sand for 10 hours a day for months, then you need to invest in one of our industrial dredges.



Piranha Pumps & Dredges
Ph.: +1 (505) 822-0449

+38 (050) 638-7576



Sales: Central, Eastern Europe & the CIS
Tel.:  +38 (044) 465-5082

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