Cavitation is an issue that plagues many of our industrial water pump customers, and can cause very serious damage to the water pump's impeller while slowing down the overall pump flow and effectiveness. How do you avoid cavitation? First, let’s explore exactly what cavitation is, what types of cavitation exist, and then how to prevent or fix this issue.
What is Water Pump Cavitation?
Cavitation is the process in which rapid changes in pressure in a liquid lead to small, vapor filled cavities where the pressure is low. These cavities, or bubbles, can collapse when put into high pressure water and cause a shock wave that can damage the impeller. In simpler terms: the changes in pressure cause bubbles, and when the bubbles increase in pressure they burst and cause shockwaves inside the pump. These shockwaves wear down the impeller and the pump body (volute) over time and can cause some very serious damage which may seem surprising given the size and strength of the bubbles. How is it that bubbles bursting can wear down a metal impeller? The reason cavitation can be so damaging is that it affects the pump over a long period of time. The cavitation may not immediately affect the pump, but over a long period of time, with constant cavitation happening, even a metal impeller can become worn down by bubbles. Before we talk about how to prevent cavitation, we need to talk about the symptoms, the five different types of cavitation, and how they happen.
Symptoms of Pump Cavitation
Before you jump to the assumption that you are dealing with pump cavitation, you need to know the symptoms of it, and make sure that you can properly ensure that any issues you are having are indeed cavitation. The first thing you can easily check for is any unusual noise coming from your pump. When the bubbles burst and cause cavitation, they make a bubbling, almost cracking sound. Another noise to look out for is a rattling coming from the impeller housing, often described by many people as “marbles bouncing around inside the pump.”
This is obviously a sound you don’t want to hear, but it’s an easy way to know that your pump might have a problem like cavitation. The next thing you can check for is if the pump is experiencing any unusual vibrating or shaking. Any cavitation can cause the pump to vibrate and shake, so watch out for your water pump vibrating strangely. You also need to check that your pump has the correct flow and pressure. If either one is decreasing, you could have a cavitation problem inside your pump. The last thing to check without opening the pump up is whether or not your equipment is using more power than usual to move the impeller. If it is cavitation, the bubbles are slowing the impeller down and causing the engine or motor to have to use more power to operate the impeller.
Any more symptoms of pump cavitation require inspection of the pump’s internal parts. Check the impeller and make sure it hasn’t sustained any erosion damage. If it has, or there are small parts of the impeller broken off inside the pump, you almost certainly have a cavitation problem. You should also check your seals and bearings, as cavitation can sometimes cause them to leak or fail.
VaporizationVaporization is the most common type of cavitation, and as such is the one that most people are looking to avoid and fix. Often called inadequate NPSHa cavitation or classic cavitation, vaporization happens when the liquid inside the pump passes through the suction side of the impeller which has lower pressure, creating the bubbles. Once the liquid passes through the impeller, any bubbles will cavitate when they encounter the higher pressure, causing the shockwaves. As you already may be able to tell, this can be a very common problem, because it can happen so easily. There are, however, solutions to help prevent vaporization cavitation in your water pump.
This first thing you may want to try is to reduce the RPM (rotations per minute), also known as the motor speed. Slowing down the pump will help reduce the speed at which liquid is flowing, and will also help decrease the head pressure. Just be careful not to reduce the power of your motor too much, as doing so can prevent your pump from pumping at the rate you need it to. Another way to help prevent vaporization cavitation is to purchase an impeller inducer (if your pump is capable of utilizing an inducer). An impeller inducer is basically a smaller impeller that you attach to the front of the main impeller. It is mainly used to increase the pump suction head, or pressure, as well as to help avoid cavitation, as the bubbles that are formed don’t have the main impeller front to attach to. The only problem with this solution is that you would have to buy an impeller inducer, as opposed to changing something in your pump. There are however other ways to try and reduce or prevent vaporization cavitation from happening, such as trying to reduce the temperature of your water pump, as hotter temperatures can also cause vaporization cavitation, as the heat literally vaporizes the water into bubbles. You could also try increasing the liquid level around the suction area of your pump to try and prevent cavitation. It's also possible to increase the diameter of the eye of your impeller, meaning that you will have less surface area for cavitation to occur on the suction side of your impeller. Only do this if it will not affect the amount of liquid you need pumped and has been approved by the manufacturer.
Internal CirculationAnother type of cavitation that can happen inside your pump is called internal circulation. This type of cavitation is a little simpler than vaporization, and can be easier to fix and avoid, as long as you have good pump maintenance. Internal circulation cavitation occurs when the pump discharge port isn’t getting liquid out at the right rate, so any liquid that wasn’t discharged as a result is recirculated back through the water pump. This recirculated liquid goes back through the high- and low-pressure points, causing it to have high heat and velocity, creating the cavitation bubbles that can damage your impeller. A common cause for your pump not discharging enough liquid or discharging it too slowly is that the discharge port was left open while the pump was still running. This is something you should always avoid, as leaving the discharge port closed can cause more problems than just cavitation, which is already something you want to avoid at all costs. In order to fix or avoid internal circulation cavitation, you need to be especially watchful of your discharge port, not allowing it to close while you are running your pump and completing regular maintenance to ensure everything is moving and working well. To make sure your discharge port is functioning, open the pump’s restricted discharge valve and look for any blockage that could be causing the liquid to recirculate. If there is any blockage, remove it and make sure the discharge port is clean and open so that your pump can effectively operate.
You should also make sure that the discharge line has the appropriate pressure. If the pressure is too little or too much you may have a problem with your header. If this is the case, you may need to replace the header to make sure you have the right amount of pressure. Also make sure that the check valve is installed correctly, as a common issue when installing the check valve is that it has been installed backwards. This is as easy as removing the check valve and re-installing it correctly. Any issue with internal circulation is usually related to the discharge line, so always make sure that you are on top of its maintenance and care so that you can avoid damage to your pump and save yourself time.
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The motor used to power a centrifugal pump needs to be able to produce enough torque to start the pump and bring it to an optimal operating speed. If a motor lacks enough torque to operate a pump, the pump may not start or may only operate at a reduced speed. The centrifugal pump suppliers at pump repair in dubai will guide you through the pump motor selection process.
A pump’s torque-speed curve is used to determine the appropriate motor to match with it. A pump’s torque-speed curve is produced by plotting the percentage of full load torque (FLT) vertically against the percentage of full load speed (FLS) plotted horizontally.
The torque-speed curve is similar for all centrifugal pumps due to simple math: the pump torque varies as the square of its speed. However, when the pump is at rest—0% full load speed—the full load torque is never also 0%. Starting a rotating pump requires the motor to overcome the pump inertia and static friction.
To overcome pump inertia and static friction, approximately 20% of full load torque is required. As the pump’s speed increases, the required torque gradually declines. For example, at about 15% full load speed the required torque typically is around 5% or 10% full load torque. As shown below, the pump torque-speed curve follows the square law:
Like pumps, motors produce a torque-speed curve of their own. By overlaying the torque-speed curve of a pump and a motor, one can verify that the motor is producing enough accelerating torque to drive the pump to full speed.
Torque and Motor Selection for Centrifugal PumpsA motor’s horsepower (HP) is used as a baseline measure of its capabilities in the field. HP is a combination of torque and speed (RPM), with 1 HP equal to 550 foot pounds per second, or 33,000 foot pounds per minute. A motor’s torque can be calculated using its horsepower using this formula, which is derived from an expression of HP as a function of torque:
T = (5,250 x HP) / N
Where T = Torque and N = RPM.
When a pump needs a new motor, three values will drive the motor selection process:
The Importance of Pump Inertia in Motor Selection
Another important factor in motor selection is the pump’s inertia value at the motor shaft. Inertia is a measure of an object’s resistance to movement change. The higher the pump inertia, the longer the motor will take to start the pump and bring it to full load speed.
This is significant because motors draw current to bring pumps up to speed. The longer a motor takes to overcome a pump’s inertia, the more heat it will generate. A motor must be sized to handle the pump’s inertia to avoid damaging the motor’s windings.
Inertia is based on one of two approaches:
How Does a Gearbox Influence Inertia?
If a motor directly drives the pump, the values of the pump and pump-motor coupling inertias are the same regardless of pump speed. If the pump is driven by a gearbox and motor, however, the gearbox can have a major impact on inertia values. In this application inertia can be expressed as:
Pump & Coupling Inertia Totals x (Gearbox Ratio)2
A gearbox’s effect on inertia can be understood by analogy to a bicycle. When a bicycle is ridden at high speeds, the rider may change to a higher gear ratio (one greater than 1.0) to go faster. Such a ratio also requires the rider to put in more effort. Likewise, if a gearbox shifts to a higher gear ratio, the motor will have a higher load. The same logic applies if the gearbox is reducing the motor speed to drive the pump slower. When the gearbox ratio is less than 1.0, it will reduce the load requirements on the motor.
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Submersible pumps of all types can provide decades of reliable performance if you can maintain them correctly and watch for wear and tear. Use these useful tips to watch for any changes and to schedule appropriate services for your submersible pumps, whether used for your own property or for an industrial application.
Maintaining regular inspections
Submersible pumps will quite often go substantial periods of time without being seen, however, there are a few easy maintenance checks you can do to ensure optimal performance and longevity. The first is to monitor the output of the pump to ensure everything is running as usual. From the surface, be sure to check for water leaks, assess the condition of electrical wiring and arrange valves and seals to be changed on time according to the manufacturer’s or supplier’s directions. It’s a good idea to book in annual maintenance inspections at a minimum from your local pump service team, who will provide you with a record of each service and what has been checked.
Symptoms to look out for in submersible pumpsKeep an eye out for these signs of failure or lesser performance on a regular basis, and you’ll be better equipped to address pump problems before they become unmanageable.
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Water pressure is the factor that can make or break a satisfying shower, give you the power to suds up your dishwater or give you a quick rinse of your soapy hands. For municipal water supply, the water pressure is mainly controlled by the city or township, although there are a few internal plumbing issues that can decrease pressure. When you have a well for your home’s water supply, the technology of your pressure tank will give you the pressure through your pipes.
Your well, water pump and pressure tank work together to get the water from the water table to your home. The well pump pulls or pushes — depending on the type of pump — the water from the well, sending it to the pressure tank, which holds the water under pressure until something in your plumbing system is turned on. The pressure tank creates pressure with a portion of its tank filled with compressed air.
When a water valve is opened within your home’s plumbing, the tank pushes out the water through the piping and then only fills up again when the pressure in the tank falls below a specific pressure rating. By having the pressure tank hold a significant amount of water, there is less wear and tear on the well pump because it doesn’t have to cycle on and off as often. Since well pumps are a bit more work to repair and replace, the pressure tank, specifically the right size of pressure tank, is an important component to a well water system.
How Water Pressure Tanks Work
Once the water is in the pressure tank, how does it know when to get more? By the hard-working pressure switch. When the tank pushes out enough water to trigger the pressure switch, it then allows more water in from the well pump. The tank is refilled to its maximum capacity, measured by the pressure gauge on the tank, and then it shuts off again. The pressure switches are set to a 20-psi range of the starting and stopping pressures. So if a pressure switch is set for 40 to 60 psi, when enough water is drained from the tank to reduce pressure to 40 psi, the pressure tank will turn on to collect water from the well through the water pump and turn off when the pressure in the tank reaches 60 psi.
Having the correct size of pressure tank for your house is important to the long life of your water pump and pressure tank. Most manufacturers provide a handy chart to size the right tank for your home, but getting a new pressure tank is one of those installations that’s best left to a professional who will know just the right tank for your home and ensure everything is connected properly.
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Take a bit of time to check the health of your well pump and all the parts that get that water from the ground to your house. You’ll likely be saving yourself some unnecessary repairs and replacements when you notice elements that aren’t working their best or issues that could become a major expense.
Here are some of the more common pressure tank issues homeowners run into that you can easily fix yourself, along with some insights to help you understand more complicated problems that you’ll need the extended knowledge of a plumber for.
Pressure Switch Maintenance
The pressure switch located near the bottom of your pressure tank requires periodic maintenance and is the most common culprit of problems with pumping your well water. Troubleshooting your well water problems is best started with the pressure switch
As with anything in your home that has power running through it, you should turn off the breaker in your electrical box to the pressure tank and well pump before working on it. It could be set up as one large breaker of 30 amps or more or a double circuit breaker with two lower amperages in tandem on the panelboard. The pressure tank and well pump should be wired on the same breaker, so if you find a label for “well” or “water pump,” that should be the power shut-off for the pressure tank, too.
Once you’re sure the power is off to the pressure tank — you can test with a non-contact voltage tester --follow these steps to perform basic maintenance on your pressure switch:
This is a great maintenance task to do on a bi-annual basis, especially if your pressure pump is in a high-humidity area like the basement. If you were trying to get your water supply back to your house with the pressure switch maintenance and it didn’t seem to do the trick, you may need a new pressure switch.
Pressure Switch ReplacementSwitches are available in three different pressure ranges: 40 to 60 psi, 30 to 50 psi and 20 to 40 psi. Your pressure tank was designed to work properly with only one of these ranges, so be sure to check which range is right for your tank. You can usually find this information printed on the inside of the switch cover.
Here are the step-by-step directions to replace your pressure switch:
If neither of these quick fixes got your system running again, you may have an issue with your pressure tank or water pump. A tank or pump failure can be caused by a number of factors: age, low-quality components, running without water, constant cycling or a clogged intake valve. Water pumps and pressure tanks don’t need much in the way of maintenance, but they do need the right environment to reach their life expectancy.
Even the most seasoned do-it-yourselfer backs off from water pump replacement or pressure tank issues. A submersible pump needs to be pulled up a long way from your well, and once it’s up, you may not be too sure what you’re going to do with it. Someone trained in water pump technology will be able to make a repair or recognize the time has come for a replacement. Even above-ground jet pumps contain a number of components that aren’t easy to troubleshoot without training and experience.
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What are the Factors to Consider While Choosing a Water Pump?
Just like all other gadgets, there are several factors to consider while choosing the right pump that suits your specific application.
Here are the Top Factors to Consider:
For most homes, a water pump with flow rates ranging from 100–200 litres is sufficient. On the other hand, for commercial applications, like industries and factories, you’ll need pumps with a flow capacity of over 2500 litres per minute.
This means, bigger the size of the inlet valve, the higher is the amount of water that is dispatched from the pump. Simply put, bigger the inlet size, faster will be the pump able to do its job and higher is the amount of water dispatched.
Let’s explain this with an example. For instance, when you buy a water pump with a maximum head of 80 metres, then it means that if you try to pump water to heights higher than 80 metres, the pump’s flow rate will reduce to zero.
The general rule of thumb is to choose water pumps with a maximum head that is higher than the height you want to displace the liquid.
Say, you want to pump water to a height of 50 metres, then you should look for pumps with a maximum head of 60 metres or more.
Do your homework. Do your research on pump brands, read reviews or ask your peers. Spend some time investigating the quality of the pump, including the motor and engine. Remember the time you spend on evaluating the quality of the pump will save you tons of money, later on.
Liquid to be Dispatched
This is the final factor that you’ll have to consider. Some pumps work only for water, while others can handle liquids with higher viscosities. If you’re looking for pumps for applications like paper manufacturing, food processing, sugar refining or chemical plants, then you’ll need to pump liquids with high viscosities.
Make sure that the pump you choose is suited to the liquid you want to transfer.
If you need any further help in choosing the right pumps for your specific application in dubai UAE, don’t hesitate to get in touch with our pump experts here at Water Pump Repair Dubai, to be connected with our friendly sales representatives, who will walk you through the entire process.
Cheers and Good Luck on Finding the Right Pump for your Applications!
Water Pump Repair Dubai is the company to call for Repair and or maintenance of pump systems, for 3 years they have been serving Dubai, Sharjah and other areas. When it comes to sewage pumps, storm water pumps, booster pumps, AC pumps, irrigation pumps, water feature pumps, commercial pool pumps and others we are the one’s to call.
Sewage pumps are used when you are unable to make gravity grade from plumbing fixtures to the city sewer main. The pump system usually consists of one or two submersible pumps that are located in a sump or vault, usually below ground. The sewage flows into the sump until it reaches a certain level; at that point a float switch activates the pumps to lift the sewage up to the gravity main sewer.
There are usually four float switches, the lower float is the off float, the next float up is the lead float, this float will bring on one pump and then alternate to the second pump every other time so they get equal run time and equal wear, you never want a pump to sit idle for long periods as it can corrode and lock up another words fail. This is why it is important to have a control panel that has the capability of alternating from the number one pump to the number two pump. In the case one of the pumps fail, the water level may rise up to the third float switch which will try to run both pumps, this is called the lag float switch.
The forth float up is the alarm float so in the case that both pumps fail the alarm will ring and warn of a potential flood situation. If the Sewer Ejector Pump System fails then it can result in very heavy damages by flooding the wastewater and sewage in your basements and crawlspaces. Flushing items such as mop fibers, diapers, feminine napkins, paper towels, papers, and other non-biodegradable materials will greatly affect the process of pumping. This may cause leaks, clogging and other sewage troubles.
Many homes that are below curb level have pump systems and most all commercial buildings that have subterranean parking or basements have sewage pump systems and or storm water pump systems. It is very important to have a Planned Maintenance Program to insure that the pump systems work when needed; most systems are forgotten about until they totally fail causing even more expense and frustration. Water Pump Repair services over 1000 pumps in Dubai. Water Pump Dubai Planned Maintenance Programs to bring peace of mind that your pump system will perform when it is needed. Water pump repair dubai is available 24 hours a day 7 days a week. We are always there for our residential, commercial, industrial and municipal customers.
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Using a well for your water supply is a definite plus over paying for municipal water, but it does not come without challenges. If your water stops flowing when on municipal water, you just pick up the phone and call for water pump repair service. With a well, the repair is all on you. You must diagnose why you do not have water and then seek the repair needed. In many cases, the problem is that you need well pump repair or replacement.
There may have been a few signs that your well pump was starting to go bad. For instance, it may have been providing lower water pressure or perhaps running nearly constantly. If you notice either of these symptoms, you should call for servicing right away. There is more chance of being able to resolve the problem with well pump repair if you do not wait until it completely fails. This still depends upon what is causing the problem, however.
If you do find yourself without water flow of any kind, there are other factors besides needing well pump repair that could be the issue. A loss of power is one possibility. If your home electricity is still working, check the fuse panel or circuit breaker box to see if the well pump is getting power. If, after changing the fuse or resetting the breaker, you still do not have water, then a power issue is less likely, but there could still be a fault somewhere in the wiring. Another cause for the lack of water could be that the water level in the well has dropped below the pump, or that the pump has disconnected and fallen away from the piping.
If your troubleshooting has not been able to yield a reason for your lack of water, give us a call at Benjamin Franklin Plumbing – Hendersonville. We offer well pump repair and replacement services that will get you back to having water again if the well pump is the problem. We offer StraightForward Pricing and an on-time guarantee so give us a call today at water pump repair dubai!
Your home or business requires a well pump, whether you’re in the heart of the city or a few miles outside of town. The water you rely on every day needs a way to get into your house, regardless of whether that happens via a supply line or your own tankl. When you turn on the faucet, you expect to see water. That’s where the water pump comes into play.
Water pumps use a motor to transport water to your home. There are two different types of pumps: jet and submersible. When you are looking to repair or replace your unit, the first thing you’ll need to determine is which type of water pump you’ll need.
Water Pump Options: Jet or SubmersibleIf you’ve been researching water pumps online you might have noticed that there’s two common types of pumps – the jet and the submersible pump. What’s the difference between these two options?
Jet pump – The jet pump is primarily used when the water table is high. Because the water is already so close to the surface, it can be collected much more easily. A jet pump is powered by an electric motor, which helps it to suction water up out of the earth. If your water table is more than 25 feet deep, a jet pump can still be used, it would just need to be configured for a deep-well system.
Submersible pump – If your water table is much lower, suction simply won’t do the trick. A submersible pump is located right inside the well rather than above it. The motor in this style pump drives water up the pipes and into the plumbing system of the home. Submersible pumps are generally more efficient than jet pumps, and last quite a long time. However, any repairs will need to be done by a professional plumber since it requires pulling the pump from the well casing.
How to Know It’s Time to Replace Your Water Pump
There are several signs that your water pump needs repair, some more noticeable than others. Perhaps the most obvious indicator is a total absence of water when you turn on the faucet. Though this can be traced to other issues, a faulty water pump is certainly something that should be considered. Similarly, a weak water flow, dirty water, or a sputtering of air when you turn on the water can also be warning signs that your well pump is on its way out.
In some cases, you won’t notice a change in your water pressure at all. Instead, you may detect strange noises coming from your water tank, or you may hear that your pump runs nonstop. Perhaps you don’t realize there’s a problem until you receive an unexpectedly high utility bill. That is a wake-up call no one wants to receive!
Work with Professional Plumbers at water pump repair dubai
When you need a water pump serviced or installed, contact a professional plumber that you can trust. A locally-owned company like water pump dubai is dedicated to delivering first-rate service while keeping prices as low as possible. We go the extra mile that those bigger name companies can’t, and because we don’t have to pay franchise fees, we’re able to offer the guaranteed lowest prices in Dubai and the surrounding areas.
When you work with the plumbing experts at water pump repair dubai you get so much more for your hard-earned money. We perform a free plumbing inspection with every plumbing repair service, so we can be sure that we’re not missing anything that you may want to repair while we’re on site. We’re upfront and transparent with our estimates and invoicing, so you’ll know ahead of time what you’ll be charged, and that you’re getting the best rate possible.
If you’re a business owner, our service agreements will cover the regular plumbing and maintenance that your business requires for a fair price. You can just set it and forget it!
Whether it’s your water pump, or something else, you can count on the team at water pump dubai for expert residential and commercial plumbing service in Dubai and the surrounding areas. Contact us water pump repair dubai or give us a call to schedule your appointment! You can reach us at +971 4 252 2966.
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Having a sump pump in your home can be the difference between worry-free rainstorms and costly water damage. As residents of Dubai, we understand the importance of having an efficient sump pump to keep your home from flooding during heavy rains. Water Pump Repair Dubai is your local sump pump repair and replacement team providing quality results you can count on.
What are the benefits of an efficient sump pump?If you live on a floodplain, a sump pump is crucial to keep excess water out of your home during heavy rain or increased hydrostatic pressure. Even on sunny days, homes built in areas where the water table is close to the surface are in danger of being rushed with excess water.
A sump pump keeps this water at bay and prevents it from reaching high levels. This keeps water away from electrical outlets and wires. It also limits the extent of water damage to the home.
What are the different types of pumps?There are various types of sump pumps, each with their own advantages.
What common problems can we help you solve? The most common sump pump problem is loss of power. To prevent this, we recommend installing a backup unit.
The switch on the pump can also become stuck; this prevents the pump from knowing that it needs to activate when the water level rises.
An incorrectly sized sump pump can also become overwhelmed if it fails to meet the demands of the rising water level. The pipes that direct the water away from your home can also freeze, preventing the pump from performing its job properly.
If you need water pump repair service your existing sump pump, call your water pump repair plumber for comprehensive service. We will make recommendations specific to your home’s needs and ensure your property is ready to weather any storm.