Tobee® What can you recommend to increase safe operation of my slurry pump?
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Apart from the usual guarding of rotating components, it is important to get advice from the manufacturer or their dealer. This is especially true if buying a Slurry Pump secondhand &#; just because the manual says it was designed to pump 2,000 gpm, it may not pump anywhere close to that if the duty isn&#;t the same as the original. Each duty is very specific. Let&#;s say you installed the Slurry Pump and had the wrong size pipe, you could have a critical issue with material settling out, which may even cause the Pump to explode.
This phenomenon has been reported by the Mine Safety and Health Administration ( bulletin) as a major concern. If a condition occurs that blocks the inlet pipe and outlet pipe of the Slurry Pump, it is estimated that 40% of the energy from the motor will go to heating the contents of the wet end of the Slurry Pump. The heat rise can be rapid and steam pressure will build, and an explosion can occur. Confirming the correct flow rate to keep materials in suspension and maintaining the design percent solids and particle size can reduce this risk. Installing power and pressure monitoring sensors that are interlocked and/or alarmed are also advised. Tobee&#;s recently developed thermocouple device is another safety feature when fitted and alarmed.
Good process design, proper mechanical design of sumps and piping, and use of safety related add-ons are factors determining the safe operation of a Slurry Pump. The manufacturer is always the best place to start.
When I reduced the length of pipe line, why did the slurry pump trip out on overload?
Because the Slurry Pump is running at fixed speed and hasn&#;t been told that you removed a section of pipe, it will keep spinning away but now finds it is easier to slurry pump. If you look at your slurry pump curve, you will see that if you lower the head (resistance) that the Slurry Pump is pumping against, the new duty point will move to the right and the speed curve and head will intersect at a higher flowrate. The higher flowrate means more work is being done and thus power demand is greater. It would be the same if you reduced the height you are pumping to. The opposite occurs if you increase the head by adding pipe or vertical height to the discharge point. The danger with increasing the head without changing the speed is the lower flowrate that results, which may be below the critical setting velocity. Contact the slurry pump manufacturer if you are contemplating changes to any part of your slurry pumping system.
Can I use oil in my slurry pump bearings?
Tobee&#;s slurry pump bearing assemblies are designed around the use of grease lubrication - this means that the seals being used are not suitable for oil. It is more complicated to design for oil and any leakage is far more troublesome for both lack of lubrication and the spillage. Grease lubrication simplifies maintenance and is appropriate for the rpms typically seen in this type of equipment
I have an old slurry pump sump that my grandfather used in our old plant, can I use that for my new plant?
Rather than just say no, which would be the first reaction from any Slurry Pump manufacturer, let&#;s examine why you probably don&#;t want to consider this. From our perspective, 90% of problems are on the suction side of a Slurry Pump. Of those problems, 90% of those are associated with poor sump design, such as wrong wall angles (buildup in valley angles and corners), too shallow (vortexing), too big (settling and sloughing), too small (air entrainment, vortexing) and incorrect suction line (entrainment and NPSH issues). The science of sump design doesn&#;t start or finish with a cube or an old truck-mounted water tank &#; a correctly designed sump can save you many thousands of dollars in maintenance on your Slurry Pump, or even save a life.
My slurry pump bearings are running hot, what should I do?
How hot are they? Tobee&#;s slurry pump bearings are designed to run at a relatively high temperature &#; we set a maximum of 120 &#; (248 &#;). Possible reasons for bearings running hot logically include slurry pump bearing failure; however, typically there will be other symptoms, such as unusual noise. Bearing failure can occur soon after gland failure if slurry has entered the seal at the wet end of the Slurry Pump.
It may simply be a faulty bearing. Were original equipment manufacturer bearings used during the last repair? It wouldn&#;t be the first time that price over value resulted in low-quality bearings being substituted.
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Failure, or symptoms of failure, can also occur due to high belt tension (drive end) or air entrainment or cavitation (wet end), which will ultimately damage the bearings. Confirm the temperature rise (rises over time or almost immediate) and ultimate temperature. Look for other symptoms, such as noise. Ensuring personal safety, use a listening stick against the housing for signs that the bearings are not running smoothly. Consult the factory with the range of symptoms.
Fortunately, Tobee&#;s slurry pump bearing assemblies are simple to repair &#; purchase a bearing repair kit and follow the instructions. Be prepared with an oven for heating, but the assembly requires no preload settings &#; just locate the bearings in place, lubricate and put the end caps on, finish lubrication and you are done.
HEBEI TOBEE PUMP CO.,LIMITED
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There&#;s a lot to think about when shopping for a new pump, and we don&#;t blame you if you feel a bit overwhelmed by the range of options and industry terminology that gets thrown around. To help make your decision a little easier, we&#;ve prepared a blog post outlining our top 6 questions to ask yourself prior to choosing a pump. As always, our team are standing by ready to assist with any questions you may have about our range.
Fluid Type
Truflo supply pumps for agriculture, construction, emergency, industrial, mining, municipal, quarrying and tunnelling. Each industry requires pumps for different reasons, and our systems can be used for water through to oil and slurry.
Before selecting a pump, you should determine the specific gravity and viscosity of the fluid you are planning to pump. It is even more helpful if you are able to provide us with the names and concentrations of any chemicals, as well as solid particle sizes and average temperature. The more detail you give us, the better equipped we are to supply you with a pump that will serve your needs long-term.
Flow Rate
Every pump has a specified flow rate measured in gallons per minute (GPM), and this will be mentioned on the product page. If you have a high flow rate, you will need a large diameter pump. You should also consider what you plan to do with the liquid, whether it be decanting, dosing or transferring.
GPM?
Viscosity
High viscosity liquids and liquids containing chemicals require heavy-duty pumps with high resistance to corrosion and proven durability. No one wants to experience premature failure due to specifying the wrong pump, and nor do you want to blow the budget by over specifying. You should try to establish the viscosity of your liquid before selecting a pump.
Discharge
If you will be pumping across a long distance with the help of vertical and horizontal pipes, you will need to consider friction loss. This can be caused by everything from pipe type through to the viscosity of the liquid. Any decrease in pumping pressure will adversely affect your operation and efficiency. Think about the distance to your discharge point and whether you will be able to get by with open free flow pipes. In some cases, it may be necessary to use pressured pipes instead.
Whether you are pumping a short run or a long distance there are some specific considerations that need to be taken into account. These being, Static height, this being the vertical height between water level (or where the pump will sit) to the highest point on the discharge pipe run. This may or may not be at your discharge point. Pipeline length, what is the length of pipe required to get to your discharge point. Do I have a pipeline profile? Pipe Size, Type etc, what type of pipe will be used? Concrete, poly, steel and what size will be required to achieve the flowrate required, is the pipe rated for the pressure of the system? From this information we can assist you to work out the Total Dynamic Head (TDH) of your system
Suction Pipe
Selecting an under or oversized suction pipe can cause inefficient transport of fluid from source to pump. Whilst calculating power is important, you&#;ll also need to consider the resistance caused by friction. Using an oversized suction line will result in higher energy costs and increased wear and tear. You may also experience cavitation, whereby pockets of air/vapour occur within the fluid as a result of pressure changes. This can cause extensive damage to your pump system and impeller. If you expect reliable performance, you should take resistance calculations into account. Don&#;t be tempted to go for a longer suction line than necessary, as a shorter line will not only be cheaper but also much more reliable and efficient.
Power
Buyers can choose from diesel, electric and petrol pumps. Think about what type of power source would best suit your needs. Technology has come a long way, and variable speed motors have made pumps more efficient than ever before.
Need Further Assistance? Contact Tru-Flo Today
When selecting a pump, it is important to take the above factors into account. By asking yourself these questions prior to purchase, you will be able to select the right pump the first time round and enjoy many years of reliable service.
If you would like further advice on our product range or assistance in choosing the right product for your application, please contact our team on +61 2 today, or submit an enquiry via our website.
If you are looking for more details, kindly visit Slurry Pumps export.