Pit & Quarry, November 2018
WASHING CLASSIFYING Maintaining vital processing equipment o youve done the research planning and finally purchased a classifying tank or fine material screw washer Now what Its time to start thinking about the best maintenance practices to ensure maximum availability of your equipment and reduce total production costs Putting in place standard processes can lead to years of continuous efficient operation Regardless of your site or equipment all maintenance programs should have similar objectives These include Being proactive instead of reactive Ensuring the equipment can be operated safely and efficiently Ensuring a targeted reliability of equipment at a rated capacity Maximizing the life of equipment Ensuring training is provided to effectively perform and support maintenance activities SAND CLASSIFYING TANK MAINTENANCE All sands cause wear on processing equipment to varying degrees In sand classifying tanks valves and valve seats are among the most commonly replaced items While some manufacturers original components are hard cast iron alloys intended for abrasion resistance these parts are often replaced by polyurethane components that offer extended wear life in most instances Valve rods torque motor paddles and paddle rods should be periodically inspected for wear and replaced when needed Sand discharging from the valves exits the sand classifying tank via down pipes often equipped with elbows to a sectionalized collecting flume The elbows handling coarse sand experience wear and require more frequent replacement than valves discharging finer sand While many sand classifying tanks have used steel pipes and hard iron elbows these metal components have been replaced with thick walled PVC pipes and polyurethane elbows that are easier to handle quicker to replace and provide equal or extended performance Liners in the sloping double or triple cell collecting flume should be visually inspected and replaced as needed too The flumes are used to direct the classified sands to dewatering equipment Types of liners include abrasion resistant steel rubber and polyurethane Liners should cover not only the bottom of the flume but also the sides to protect the fabricated steel flume The opening and closing of the sand classifying tank valves is made via hydraulic cylinders connected to a valve rod A self contained hydraulic power 16 PIT QUARRY November 2018 pitandquarry com ALL IMAGES MCLANAHAN CORP Tips and tricks to keep your classifying tank and fine material screw washer up and running EDITED BY KEVIN YANIK S All electric systems wiring and hydraulic lines in sand classifying tanks should be checked periodically to make sure they are functioning properly and do not cause an improper grounding or leakage
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