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Strainers
Pumping water also means that you might be pumping potentially contaminated water. Sewage or flood waters also come with lots of debris and sludgy sentiment that has the ability to clog and deteriorate your water pump. A strainer can prevent those mishaps. By investing in an add-on strainer, you can be confident that any contaminants will be caught before entering the inner mechanisms of your water pump. Depending on what size of solids you’re dealing with, you’ll want to be sure you’re choosing the appropriate size of holes for your strainer.
Hose Kits
You already know you need one hose when working with your water pump, no matter what the application. There are some applications which will require the use of more than one hose. If your task requires you to transfer water from point A to point B, you’ll want to look into purchasing a hose kit so you have the appropriate length hose for your job. Hose kits are essential for any trash-pumping tasks.
Discharge Hose
A discharge hose may or may not be included in your hose kit, as discussed above. The discharge hose is specifically designed to help draw water away from a flooded area, and towards the newly designated location. If you live in a flood-heavy area, like the Midwest, a discharge hose is a must have for your water pump preparedness kit.
Wheel Kits
Wheel kits are one of the most handy accessories to have stored in your shed or garage. Trying to load and haul a water pump can be an energy and time consuming process, but have no fear! By keeping a wheel kit handy, you can create easy access for your water pump. For less money than a trolley or a truck, a wheel kit easily attaches itself to your water pump so you can wheel the pump right where you need it. Save your energy for the task at hand, not tugging and pulling a heavy machine to your work site.
Nozzles
If you’re concerned about keeping control over the flow of water coming out of your pump, consider a nozzle attachment. Many nozzles are now equipped with a pistol-style grip so you can more easily hold the nozzle while aiming it directly where you need the water to be. A quick fix accessory that makes water pumping tasks even easier!
Coupling
If you’re using multiple hoses for your water pump applications, a coupling or “adapter” will help make your work easier. A coupling allows operators to quickly connect their water pumps while avoiding the time-consuming use of threading, tools, lugs, twisting, springs, and ball bearings. Couplings help you increase the efficiency of your work. Ideal for utility and irrigation contractors, municipalities, and other industrial uses.
For more info contact water pump dubai or call us at +971 4 252 2966
Pumping water also means that you might be pumping potentially contaminated water. Sewage or flood waters also come with lots of debris and sludgy sentiment that has the ability to clog and deteriorate your water pump. A strainer can prevent those mishaps. By investing in an add-on strainer, you can be confident that any contaminants will be caught before entering the inner mechanisms of your water pump. Depending on what size of solids you’re dealing with, you’ll want to be sure you’re choosing the appropriate size of holes for your strainer.
Hose Kits
You already know you need one hose when working with your water pump, no matter what the application. There are some applications which will require the use of more than one hose. If your task requires you to transfer water from point A to point B, you’ll want to look into purchasing a hose kit so you have the appropriate length hose for your job. Hose kits are essential for any trash-pumping tasks.
Discharge Hose
A discharge hose may or may not be included in your hose kit, as discussed above. The discharge hose is specifically designed to help draw water away from a flooded area, and towards the newly designated location. If you live in a flood-heavy area, like the Midwest, a discharge hose is a must have for your water pump preparedness kit.
Wheel Kits
Wheel kits are one of the most handy accessories to have stored in your shed or garage. Trying to load and haul a water pump can be an energy and time consuming process, but have no fear! By keeping a wheel kit handy, you can create easy access for your water pump. For less money than a trolley or a truck, a wheel kit easily attaches itself to your water pump so you can wheel the pump right where you need it. Save your energy for the task at hand, not tugging and pulling a heavy machine to your work site.
Nozzles
If you’re concerned about keeping control over the flow of water coming out of your pump, consider a nozzle attachment. Many nozzles are now equipped with a pistol-style grip so you can more easily hold the nozzle while aiming it directly where you need the water to be. A quick fix accessory that makes water pumping tasks even easier!
Coupling
If you’re using multiple hoses for your water pump applications, a coupling or “adapter” will help make your work easier. A coupling allows operators to quickly connect their water pumps while avoiding the time-consuming use of threading, tools, lugs, twisting, springs, and ball bearings. Couplings help you increase the efficiency of your work. Ideal for utility and irrigation contractors, municipalities, and other industrial uses.
For more info contact water pump dubai or call us at +971 4 252 2966
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Water system motors that are used in wells, fountains, and aerators are typically filled with a water based solution. In a deep well, you don't generally worry about the motor freezing; however, in fountains or ponds, your water pump must be protected. If you remove the pump entirely, you'll want to store the motor somewhere it won't freeze.
Another option for winter storage for a pond, fountain, or aerator is to sink or weigh the motor to the bottom of the pond. If you do this, you'll want to be sure to place the motor below the lowest freeze level.
You do not want to let your surface pumps freeze. In cold weather areas, most everyone knows to drain or winterize an above ground water system. But problem areas do exist – in the normally warmer Southern states, water pump operators might be caught off guard with a sudden cold snap.
Water expands as it freezes. Without some place to handle the extra volume, the ice will inevitably break in the pump or piping. As cold weather approaches, don't forget to protect your above ground water system, plumbing, and pump equipment from freezing. In year-round-homes, the well pump can often still set idle for long enough that the water may freeze solid. It might be necessary to provide additional heat to prevent freezing in these circumstances. If the temperatures go very low, you can keep a small amount of water running continuously until the temperature comes back up to a safe temperature, as running water is more difficult to freeze.
When you're dealing with a jet or centrifugal pump that you're not going to use for a few months, draining the system and moving the pump to a warmer location is one of the best solutions.
To drain the pump, remove the drain plug on top of the pump case, or open a faucet. This allows air into the pump body. Then, take off the drain plug on the bottom of the pump case. This allows the water to flow through and out of the pump body.
Remember, there's also going to be water that's stuck in the suction and discharge pipes. You should blow this excess water out with an air compressor.
The last step is to protect your pump against any water that might get stuck in the pump casing even after you've drained it. Use propylene glycol (food grade) – never ethylene glycol (or RV antifreeze) as its extremely dangerous. Before you put propylene glycol into the pump body, replace the drain plugs. First insert the bottom drian plug, and pour the propylene glycol into the top port. Then you can reinsert the top drain plug.
For more info contact water pump dubai or call us at +971 4 252 2966
Another option for winter storage for a pond, fountain, or aerator is to sink or weigh the motor to the bottom of the pond. If you do this, you'll want to be sure to place the motor below the lowest freeze level.
You do not want to let your surface pumps freeze. In cold weather areas, most everyone knows to drain or winterize an above ground water system. But problem areas do exist – in the normally warmer Southern states, water pump operators might be caught off guard with a sudden cold snap.
Water expands as it freezes. Without some place to handle the extra volume, the ice will inevitably break in the pump or piping. As cold weather approaches, don't forget to protect your above ground water system, plumbing, and pump equipment from freezing. In year-round-homes, the well pump can often still set idle for long enough that the water may freeze solid. It might be necessary to provide additional heat to prevent freezing in these circumstances. If the temperatures go very low, you can keep a small amount of water running continuously until the temperature comes back up to a safe temperature, as running water is more difficult to freeze.
When you're dealing with a jet or centrifugal pump that you're not going to use for a few months, draining the system and moving the pump to a warmer location is one of the best solutions.
To drain the pump, remove the drain plug on top of the pump case, or open a faucet. This allows air into the pump body. Then, take off the drain plug on the bottom of the pump case. This allows the water to flow through and out of the pump body.
Remember, there's also going to be water that's stuck in the suction and discharge pipes. You should blow this excess water out with an air compressor.
The last step is to protect your pump against any water that might get stuck in the pump casing even after you've drained it. Use propylene glycol (food grade) – never ethylene glycol (or RV antifreeze) as its extremely dangerous. Before you put propylene glycol into the pump body, replace the drain plugs. First insert the bottom drian plug, and pour the propylene glycol into the top port. Then you can reinsert the top drain plug.
For more info contact water pump dubai or call us at +971 4 252 2966
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A centrifugal pump is very versatile, and can be used for agriculture, industrial, and many other applications. Their main job is to transport liquid from one place to another.
Some centrifugal water pumps have solids handling capabilities, which means they can move liquids that have solids in them (up to a certain extent), as well as chemicals, making these pumps very popular. Centrifugal pumps are classified as kinetic pumps, and the way centrifugal pumps move a substance is through kinetic energy (motion). This is done through a part called the impeller, which is a large, usually metal rotor, that spins very quickly, much like the impeller on a motor boat.
The basic parts of a centrifugal water pump:
Pump Body/Casing
The pump body, or casing, is the external case of a water pump. It’s what houses the impeller, the volute, and all the other internal parts. The pump body is most commonly made of cast iron, due to more economical manufacturing costs, but can also be made of stainless steel, bronze, plastic or other materials. Its main purpose is to house all the internal working parts of the pump. It’s like the case of a computer, in that it keeps all the parts in, and helps protect them.
Volute
A water pump volute is a kind of curved funnel leading to the discharge port that widens out the farther it goes. It is a casing around the impeller that the liquid comes into contact with as it enters the pump. As the water enters the volute, the volute helps decrease the speed/flow of the water or liquid, while increasing the pressure, which helps to balance the pressure on the impeller shaft. The volute can be made of either cast iron, steel, plastic, or bronze.
Some centrifugal pumps incorporate the pump body and volute as one piece, thus the pump body/casing also functions as the volute.
Impeller
The impeller can be made of a variety of materials. The most common are cast iron, bronze, brass, stainless steel and plastic. Bronze and stainless steel are mostly used for ocean water, while temperature resistant steel can be used for hot or cold water. Plastic is most commonly used for chemicals and other caustic and corrosive liquids.
The liquid comes in through the suction port (inlet), which then pushes it towards the pump impeller. As the impeller spins very quickly, it forces the liquid out of the discharge port (outlet). It works much like a vacuum cleaner, in that the energy from the impeller sucks the liquid in, spins it around, and pushes it back out the discharge port at a high rate of speed.
Power
A centrifugal pump can be powered from a variety of power sources. Most commonly, they are powered by an electric motor, a gas or diesel-powered engine, or a hydraulic motor, all which power the pump by driving the shaft that spins the impeller.
Pump Shaft
Another important part of a centrifugal pump is the pump shaft, which is what the impeller is mounted to. The pump shaft connects to the motor or engine, which then powers the impeller and makes it spin. An important part of the shaft is the shaft sleeve, often made of cast iron, stainless steel or bronze which helps to better fit the impeller onto the shaft, as well as protecting the shaft from damage and wear and tear.
For more info contact water pump dubai or call us at +971 4 252 2966
Some centrifugal water pumps have solids handling capabilities, which means they can move liquids that have solids in them (up to a certain extent), as well as chemicals, making these pumps very popular. Centrifugal pumps are classified as kinetic pumps, and the way centrifugal pumps move a substance is through kinetic energy (motion). This is done through a part called the impeller, which is a large, usually metal rotor, that spins very quickly, much like the impeller on a motor boat.
The basic parts of a centrifugal water pump:
Pump Body/Casing
The pump body, or casing, is the external case of a water pump. It’s what houses the impeller, the volute, and all the other internal parts. The pump body is most commonly made of cast iron, due to more economical manufacturing costs, but can also be made of stainless steel, bronze, plastic or other materials. Its main purpose is to house all the internal working parts of the pump. It’s like the case of a computer, in that it keeps all the parts in, and helps protect them.
Volute
A water pump volute is a kind of curved funnel leading to the discharge port that widens out the farther it goes. It is a casing around the impeller that the liquid comes into contact with as it enters the pump. As the water enters the volute, the volute helps decrease the speed/flow of the water or liquid, while increasing the pressure, which helps to balance the pressure on the impeller shaft. The volute can be made of either cast iron, steel, plastic, or bronze.
Some centrifugal pumps incorporate the pump body and volute as one piece, thus the pump body/casing also functions as the volute.
Impeller
The impeller can be made of a variety of materials. The most common are cast iron, bronze, brass, stainless steel and plastic. Bronze and stainless steel are mostly used for ocean water, while temperature resistant steel can be used for hot or cold water. Plastic is most commonly used for chemicals and other caustic and corrosive liquids.
The liquid comes in through the suction port (inlet), which then pushes it towards the pump impeller. As the impeller spins very quickly, it forces the liquid out of the discharge port (outlet). It works much like a vacuum cleaner, in that the energy from the impeller sucks the liquid in, spins it around, and pushes it back out the discharge port at a high rate of speed.
Power
A centrifugal pump can be powered from a variety of power sources. Most commonly, they are powered by an electric motor, a gas or diesel-powered engine, or a hydraulic motor, all which power the pump by driving the shaft that spins the impeller.
Pump Shaft
Another important part of a centrifugal pump is the pump shaft, which is what the impeller is mounted to. The pump shaft connects to the motor or engine, which then powers the impeller and makes it spin. An important part of the shaft is the shaft sleeve, often made of cast iron, stainless steel or bronze which helps to better fit the impeller onto the shaft, as well as protecting the shaft from damage and wear and tear.
For more info contact water pump dubai or call us at +971 4 252 2966
- Published on
Commercial buildings use Heating, Ventilation and Air Conditioning (HVAC) systems to dehumidify and to cool the building. Modern commercial buildings seek efficient HVAC systems and components as part of broader initiatives centered on building performance and sustainability. Building occupants similarly carry great expectations, that the HVAC system will function as intended to create a comfortable interior environment regardless of the conditions external to the building.
Chillers have become an essential HVAC component of a wide variety of commercial facilities, including hotels, restaurants, hospitals, sporting arenas, industrial and manufacturing plants, etc. The industry has long recognized that chiller systems represent the single largest consumer of electrical usage in most facilities. They can easily consume more than 50% of the total electrical usage during seasonal periods. Chillers can combine to use approximately 20% of the total electric power generated. Moreover, estimates that chillers can expend up to 30% in additional energy usage due to various operational inefficiencies. These acknowledged inefficiencies cost companies and building facilities billions of dollars annually.
In general, a chiller facilitates the transfer of heat from an internal environment to an external environment. This heat-transfer device relies on the physical state of a refrigerant as it circulates through the chiller system. Certainly, chillers can function as the heart of any central HVAC system.
How Does a Chiller Work?
A chiller works on the principle of vapor compression or vapor absorption. Chillers provide a continuous flow of coolant to the cold side of a process water system at a desired temperature of about 50°F (10°C). The coolant is then pumped through the process, extracting heat out of one area of a facility (e.g., machinery, process equipment, etc.) as it flows back to the return side of the process water system.
A chiller uses a vapor compression mechanical refrigeration system that connects to the process water system through a device called an evaporator. Refrigerant circulates through an evaporator, compressor, condenser and expansion device of a chiller. A thermodynamic process occurs in each of above components of a chiller. The evaporator functions as a heat exchanger such that heat captured by the process coolant flow transfers to the refrigerant. As the heat-transfer takes place, the refrigerant evaporates, changing from a low-pressure liquid into vapor, while the temperature of the process coolant reduces.
The refrigerant then flows to a compressor, which performs multiple functions. First, it removes refrigerant from the evaporator and ensures that the pressure in the evaporator remains low enough to absorb heat at the correct rate. Second, it raises the pressure in outgoing refrigerant vapor to ensure that its temperature remains high enough to release heat when it reaches the condenser. The refrigerant returns to a liquid state at the condenser. The latent heat given up as the refrigerant changes from vapor to liquid is carried away from the environment by a cooling medium (air or water).
For more info contact water pump dubai or call us at +971 4 252 2966
Chillers have become an essential HVAC component of a wide variety of commercial facilities, including hotels, restaurants, hospitals, sporting arenas, industrial and manufacturing plants, etc. The industry has long recognized that chiller systems represent the single largest consumer of electrical usage in most facilities. They can easily consume more than 50% of the total electrical usage during seasonal periods. Chillers can combine to use approximately 20% of the total electric power generated. Moreover, estimates that chillers can expend up to 30% in additional energy usage due to various operational inefficiencies. These acknowledged inefficiencies cost companies and building facilities billions of dollars annually.
In general, a chiller facilitates the transfer of heat from an internal environment to an external environment. This heat-transfer device relies on the physical state of a refrigerant as it circulates through the chiller system. Certainly, chillers can function as the heart of any central HVAC system.
How Does a Chiller Work?
A chiller works on the principle of vapor compression or vapor absorption. Chillers provide a continuous flow of coolant to the cold side of a process water system at a desired temperature of about 50°F (10°C). The coolant is then pumped through the process, extracting heat out of one area of a facility (e.g., machinery, process equipment, etc.) as it flows back to the return side of the process water system.
A chiller uses a vapor compression mechanical refrigeration system that connects to the process water system through a device called an evaporator. Refrigerant circulates through an evaporator, compressor, condenser and expansion device of a chiller. A thermodynamic process occurs in each of above components of a chiller. The evaporator functions as a heat exchanger such that heat captured by the process coolant flow transfers to the refrigerant. As the heat-transfer takes place, the refrigerant evaporates, changing from a low-pressure liquid into vapor, while the temperature of the process coolant reduces.
The refrigerant then flows to a compressor, which performs multiple functions. First, it removes refrigerant from the evaporator and ensures that the pressure in the evaporator remains low enough to absorb heat at the correct rate. Second, it raises the pressure in outgoing refrigerant vapor to ensure that its temperature remains high enough to release heat when it reaches the condenser. The refrigerant returns to a liquid state at the condenser. The latent heat given up as the refrigerant changes from vapor to liquid is carried away from the environment by a cooling medium (air or water).
For more info contact water pump dubai or call us at +971 4 252 2966
- Published on
The condenser water pumps take hot water from the condenser to the cooling tower, and the chilled water pumps take cold water from the chiller to your AC unit.
When the pump fails, water is not circulated as efficiently or at all, compromising the performance of your entire system. Thankfully, pumps often signal that there is something wrong, and these signals usually come in the form of odd and loud pump noises.
Loud and unusual sounds emanating from circulating pumps are always a red flag, a sign that something is wrong either with the pump or in the water lines.
Let’s take a look at a few problems in a building system that are commonly the cause of pump noises, and how to fix them.
1. Air in The System
If you don’t have an air separator installed, you will most likely have to deal with air in your system at some point. When this happens, it’s important to inspect the water lines and bleed the system.
Modern pumps have bleeder valves that make the process very easy. Slowly open the valve until you start hearing a hissing noise. Once the hissing ceases, you will see a slight dribble of water, indicating that the pump no longer has air. At this point, you can close the valve.
After doing this, make sure that the pump has been installed correctly. Even a few degrees of inclination or misalignment will allow air to get locked in the pump.
2. Incorrect Pump Size
Both oversized and undersized pumps can lead to noises in the system, but the solution to deal with each case is different.
Pumps can be oversized for several reasons. It could happen due to a degree of error in the planning and design stage when engineers need to “guesstimate” piping length and fittings, or it could be purposely designed this way so the system can expand in the future and the “right-size” pump today would not be able to meet the future demand of tomorrow.
Sometimes a pump replacement is needed right away, and the supplier didn’t have the perfect replacement in stock, or the engineers choose an oversized pump already considering an expected build-up of corrosion in the pipes that require more pump head.
Regardless of the reason that led to an oversized pump, having one can always cause excessive noise and vibration, loosing up connections and joints and causing piping fatigue.
To solve the issue, you can take the following actions:
If the system is undersized, it can’t provide the duty needed, it can also lead to deadheading - when a pump’s discharge is closed because of a blockage in the line or an unintentional closed valve. When this happens, the fluid churns inside the pump until it heats up into a vapor, causing noise and damage. Deadheaded pumps can lead to motor burn out, a damaged impeller, seal leakage, cracked bushings, and compromised elastomers, ultimately killing the pump.
In systems with undersized pumps, you can verify if the existing pump can handle a larger motor to avoid dead head. Even though it may be the cheapest way to handle the problem, it is not the best and the solution would just be temporary.
3. Excessive Wear of Bearings
Only some pumps have bearing assemblies, not all. However, all electric pump motors have bearings, and the excessive wear of bearings – whether on the assembly or inside the motor - can cause pump noise.
The good news is that pump models with bearing assemblies usually have the components available for purchase, and they are inexpensive and easy to replace.
The bad news is that motor bearings are not sold as components, and when the bearings wear out in the motor, you need to replace the entire part.
The life of a bearing is determined by how many hours it takes for the metal to “fatigue,” but many factors can affect this, such as static overload, corrosion, lack of excess of lubricant, overheat, misalignment, and contamination. So, the best way to avoid bearings from wearing out too fast is via preventive maintenance and a comprehensive inspection of your system.
4. Clogged System
Water with rust and other sediments can wear out the circulating pump and clog the impeller. When this happens, noise is a consequence. To get rid of it, there is no magic bullet: the solution is in cleaning the system.
Many HVAC systems have dedicated filtration systems and dirt separators to prevent clogging from happening. Sediments can be easily removed from the system through water blowdown.
These systems protect not only pumps but all the other HVAC units in the system.
5. Incorrect Speed Setting
High-quality and modern pumps usually have 3 flow settings, while older pumps may have only one or two. That’s why older pumps are typically noisier than others. They are less efficient, and the energy loss is usually translated into a humming noise.
If your pump is making this noise and you have more than one option of flow setting to work with, locate the flow switch and turn it down one level. Then check the radiators and tower rails to verify if they are still getting up to the temperature they should. If so, then leave it this way.
If you operate with a VFD and your pump is still making a humming noise, check to see if you have a correct grounding of the motor to the VFD. In many cases, incorrect grounding allows the system to act as a noise transmitter.
6. Lack of NPSHa or Incorrect Install Causing Lack of NPSHa
To understand this, we need to take a step back and take a quick look at pump operation. Bernoulli's principle shows us that fluid flows from areas of high pressure to areas of low pressure.
HVAC pumps operate by creating low pressure at the inlet, allowing the water to be pushed into the pump. As the fluid flows through the pump, the pressure decreases. If the pressure at the inlet happens to fall below the vapor pressure of the fluid, air bubbles form at the inlet. These bubbles can cause cavitation, leading to pump noise, damage, and lower capacity.
Net Positive Suction Head or NPSH is the difference between liquid pressure at the pump suction and liquid vapor pressure and is expressed in terms of the height of the liquid column. NPSH needs to be usually 3 to 5 feet to avoid cavitation.
If detected in an inspection that there’s a problem with the NPSH, basically two things can be done: first, there’s the option to choose a more appropriate pump for the application (our recommendation if the pump has already suffered irreparable damage due to cavitation). Second, the system can be reevaluated to see if elevating the cooling tower can increase NPSHa (the absolute pressure at the suction port of the pump) or if fittings that rob current NPSHa can be reduced.
If you need assistance with anything related to circulating pumps, contact water pump dubai. we can go wherever you are to inspect your pump if you are experiencing loud and unusual noises.
When the pump fails, water is not circulated as efficiently or at all, compromising the performance of your entire system. Thankfully, pumps often signal that there is something wrong, and these signals usually come in the form of odd and loud pump noises.
Loud and unusual sounds emanating from circulating pumps are always a red flag, a sign that something is wrong either with the pump or in the water lines.
Let’s take a look at a few problems in a building system that are commonly the cause of pump noises, and how to fix them.
1. Air in The System
If you don’t have an air separator installed, you will most likely have to deal with air in your system at some point. When this happens, it’s important to inspect the water lines and bleed the system.
Modern pumps have bleeder valves that make the process very easy. Slowly open the valve until you start hearing a hissing noise. Once the hissing ceases, you will see a slight dribble of water, indicating that the pump no longer has air. At this point, you can close the valve.
After doing this, make sure that the pump has been installed correctly. Even a few degrees of inclination or misalignment will allow air to get locked in the pump.
2. Incorrect Pump Size
Both oversized and undersized pumps can lead to noises in the system, but the solution to deal with each case is different.
Pumps can be oversized for several reasons. It could happen due to a degree of error in the planning and design stage when engineers need to “guesstimate” piping length and fittings, or it could be purposely designed this way so the system can expand in the future and the “right-size” pump today would not be able to meet the future demand of tomorrow.
Sometimes a pump replacement is needed right away, and the supplier didn’t have the perfect replacement in stock, or the engineers choose an oversized pump already considering an expected build-up of corrosion in the pipes that require more pump head.
Regardless of the reason that led to an oversized pump, having one can always cause excessive noise and vibration, loosing up connections and joints and causing piping fatigue.
To solve the issue, you can take the following actions:
- Throttle the pressure-side valves until the noises are eliminated
- Trim the impeller diameter
- Reduce pump speed
- Add a flow recirculation line
- Install a variable frequency drive and remove control valves
If the system is undersized, it can’t provide the duty needed, it can also lead to deadheading - when a pump’s discharge is closed because of a blockage in the line or an unintentional closed valve. When this happens, the fluid churns inside the pump until it heats up into a vapor, causing noise and damage. Deadheaded pumps can lead to motor burn out, a damaged impeller, seal leakage, cracked bushings, and compromised elastomers, ultimately killing the pump.
In systems with undersized pumps, you can verify if the existing pump can handle a larger motor to avoid dead head. Even though it may be the cheapest way to handle the problem, it is not the best and the solution would just be temporary.
3. Excessive Wear of Bearings
Only some pumps have bearing assemblies, not all. However, all electric pump motors have bearings, and the excessive wear of bearings – whether on the assembly or inside the motor - can cause pump noise.
The good news is that pump models with bearing assemblies usually have the components available for purchase, and they are inexpensive and easy to replace.
The bad news is that motor bearings are not sold as components, and when the bearings wear out in the motor, you need to replace the entire part.
The life of a bearing is determined by how many hours it takes for the metal to “fatigue,” but many factors can affect this, such as static overload, corrosion, lack of excess of lubricant, overheat, misalignment, and contamination. So, the best way to avoid bearings from wearing out too fast is via preventive maintenance and a comprehensive inspection of your system.
4. Clogged System
Water with rust and other sediments can wear out the circulating pump and clog the impeller. When this happens, noise is a consequence. To get rid of it, there is no magic bullet: the solution is in cleaning the system.
Many HVAC systems have dedicated filtration systems and dirt separators to prevent clogging from happening. Sediments can be easily removed from the system through water blowdown.
These systems protect not only pumps but all the other HVAC units in the system.
5. Incorrect Speed Setting
High-quality and modern pumps usually have 3 flow settings, while older pumps may have only one or two. That’s why older pumps are typically noisier than others. They are less efficient, and the energy loss is usually translated into a humming noise.
If your pump is making this noise and you have more than one option of flow setting to work with, locate the flow switch and turn it down one level. Then check the radiators and tower rails to verify if they are still getting up to the temperature they should. If so, then leave it this way.
If you operate with a VFD and your pump is still making a humming noise, check to see if you have a correct grounding of the motor to the VFD. In many cases, incorrect grounding allows the system to act as a noise transmitter.
6. Lack of NPSHa or Incorrect Install Causing Lack of NPSHa
To understand this, we need to take a step back and take a quick look at pump operation. Bernoulli's principle shows us that fluid flows from areas of high pressure to areas of low pressure.
HVAC pumps operate by creating low pressure at the inlet, allowing the water to be pushed into the pump. As the fluid flows through the pump, the pressure decreases. If the pressure at the inlet happens to fall below the vapor pressure of the fluid, air bubbles form at the inlet. These bubbles can cause cavitation, leading to pump noise, damage, and lower capacity.
Net Positive Suction Head or NPSH is the difference between liquid pressure at the pump suction and liquid vapor pressure and is expressed in terms of the height of the liquid column. NPSH needs to be usually 3 to 5 feet to avoid cavitation.
If detected in an inspection that there’s a problem with the NPSH, basically two things can be done: first, there’s the option to choose a more appropriate pump for the application (our recommendation if the pump has already suffered irreparable damage due to cavitation). Second, the system can be reevaluated to see if elevating the cooling tower can increase NPSHa (the absolute pressure at the suction port of the pump) or if fittings that rob current NPSHa can be reduced.
If you need assistance with anything related to circulating pumps, contact water pump dubai. we can go wherever you are to inspect your pump if you are experiencing loud and unusual noises.
- Published on
Types of Chillers:
As described, two different cooling mediums (air or water) can facilitate the transfer of the latent heat given up as the refrigerant changes from vapor to liquid. Thus, chillers can use two different types of condensers, air-cooled and water-cooled.
Water-cooled chillers feature a water-cooled condenser connected with a cooling tower. They have commonly been used for medium and large installations that have a sufficient water supply. Water-cooled chillers can produce more constant performance for commercial and industrial air conditioning because of the relative independence to fluctuations of the ambient temperature. Water-cooled chillers range in size from small 20-ton capacity models to several thousand-ton models that cool the world’s largest facilities such as airports, shopping malls and other facilities.
A typical water-cooled chiller uses recirculating condenser water from a cooling tower to condense the refrigerant. A water-cooled chiller contains a refrigerant dependent on the entering condenser water temperature (and flow rate), which functions in relation to the ambient wet-bulb temperature. Since the wet-bulb temperature is always lower than the dry-bulb temperature, the refrigerant condensing temperature (and pressure) in a water-cooled chiller can often operate significantly lower than an air-cooled chiller. Thus, water-cooled chillers can operate more efficiently.
Water-cooled chillers typically reside indoors in an environment protected from the elements. Hence, water-cooled chiller can offer a longer lifespan. Water-cooled chillers typically represent the only option for larger installations. The additional cooling tower system will require additional installation expense and maintenance as compared to air-cooled chillers.
Air-Cooled Chillers:
Air-cooled chillers rely on a condenser cooled by the environment air. Thus, air-cooled chillers may find common application in smaller or medium installations where space constraints may exist. An air-cooled chiller can represent the most practical choice in scenarios where water represents a scarce resource.
A typical air-cooled chiller can feature propeller fans or mechanical refrigeration cycles to draw ambient air over a finned coil to condense the refrigerant. The condensation of the refrigerant vapor in the air-cooled condenser enables the transfer of heat to the atmosphere.
Air-cooled chillers offer the significant advantage of lower installation costs. Simpler maintenance also results due to their relative simplicity as compared to water-cooled chillers. Air-cooled chillers will occupy less space, but will mostly reside outside a facility. Thus, the outdoor elements will compromise their functional lifespan.
The all-inclusive nature of air-cooled chillers reduces maintenance costs. Their relative simplicity coupled with reduced space requirements produces great advantages in many types of installations.
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As described, two different cooling mediums (air or water) can facilitate the transfer of the latent heat given up as the refrigerant changes from vapor to liquid. Thus, chillers can use two different types of condensers, air-cooled and water-cooled.
- Air-cooled condensers resemble the “radiators” that cool automobile engines. They use a motorized blower to force air across a grid of refrigerant lines. Unless they are specially designed for high-ambient conditions, air-cooled condensers require ambient temperatures of 95°F (35°C) or below to operate effectively.
- Water-cooled condensers perform the same function as air-cooled condensers, but require two steps to complete the heat transfer. First, heat moves from refrigerant vapor into the condenser water. Then, the warm condenser water is pumped to a cooling tower where the process heat is ultimately discharged to the atmosphere.
Water-cooled chillers feature a water-cooled condenser connected with a cooling tower. They have commonly been used for medium and large installations that have a sufficient water supply. Water-cooled chillers can produce more constant performance for commercial and industrial air conditioning because of the relative independence to fluctuations of the ambient temperature. Water-cooled chillers range in size from small 20-ton capacity models to several thousand-ton models that cool the world’s largest facilities such as airports, shopping malls and other facilities.
A typical water-cooled chiller uses recirculating condenser water from a cooling tower to condense the refrigerant. A water-cooled chiller contains a refrigerant dependent on the entering condenser water temperature (and flow rate), which functions in relation to the ambient wet-bulb temperature. Since the wet-bulb temperature is always lower than the dry-bulb temperature, the refrigerant condensing temperature (and pressure) in a water-cooled chiller can often operate significantly lower than an air-cooled chiller. Thus, water-cooled chillers can operate more efficiently.
Water-cooled chillers typically reside indoors in an environment protected from the elements. Hence, water-cooled chiller can offer a longer lifespan. Water-cooled chillers typically represent the only option for larger installations. The additional cooling tower system will require additional installation expense and maintenance as compared to air-cooled chillers.
Air-Cooled Chillers:
Air-cooled chillers rely on a condenser cooled by the environment air. Thus, air-cooled chillers may find common application in smaller or medium installations where space constraints may exist. An air-cooled chiller can represent the most practical choice in scenarios where water represents a scarce resource.
A typical air-cooled chiller can feature propeller fans or mechanical refrigeration cycles to draw ambient air over a finned coil to condense the refrigerant. The condensation of the refrigerant vapor in the air-cooled condenser enables the transfer of heat to the atmosphere.
Air-cooled chillers offer the significant advantage of lower installation costs. Simpler maintenance also results due to their relative simplicity as compared to water-cooled chillers. Air-cooled chillers will occupy less space, but will mostly reside outside a facility. Thus, the outdoor elements will compromise their functional lifespan.
The all-inclusive nature of air-cooled chillers reduces maintenance costs. Their relative simplicity coupled with reduced space requirements produces great advantages in many types of installations.
For more info contact water pump dubai or call us at +971 4 252 2966
