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There's much to consider before buying a pump.
Anyone wanting to buy a new pump for their water logistics system will need to answer a lot of questions first before the manufacturers choose the suitable pump Model.
Here is a brief overview of what to expect:
What should be pumped?
This is a fundamental question. Pumps cannot pump all fluids. What medium the slurry pump transport ? Used in which industry ? like gold mining , iron mining , or river sand pump suction? Or others industry . The Slurry Density ? the Solid Concentration? Corrosive or not ?
What pumping volume?
The water volume that needs to be pumped (l/min or m³/h) is usually the factor that dictates the required pump output. Each pump covers one range and has an optimum, which is why there are so many types &#; for instance, Naipu has more 30 model pumps . Naipu Slurry Pump can reach 5-m3/h. Don&#;t forget to take into account the diameter of any pipes through which the pumped volume needs to pass.
How high can the medium be pumped?
This question is linked to the previous one because the pumping volume will decrease the higher it is pumped. The main factor here is the absolute height difference between the lower and upper water level (geodetic head). High pressure pumps can pump up to more than 100 m. The same thing also applies if, instead, the horizontal distance is very large. If possible , could you please try to draw a sketch drawing about how you plan to install the pump , transport from where to where ? the horizontal tansport distance ? the vertical height? so that our engineer can calculate the exact head required. , Tip: Sometimes two (identical) pumps can be operated in series if an adapter is used &#; the second pump acts as a booster and almost doubles the output.
Does snoring occur?
This is what experts refer to when not only water, but also air, is suctioned in; for instance, at removal points where the water level is (too) low in some cases. This is critical for many pump motors because they will overheat very quickly without any water to cool them. Tip: Ensure that the pumps have a dry-run protection feature &#; this will allow them to withstand this torture.
Does the water volume vary?
If the pump is required infrequently, pumps with permanently attached level sensors are the solution because they switch on and off automatically. Electrode sensors are much more reliable than mechanical contact switches. Alternatively, an external control unit can be used. Tip: Frequency converters ensure a gentle start-up, prevent pressure surges and balance out multi-pump systems.
Electrical connection?
There are pumps for almost all capacity ranges. The higher the range, the higher the connected load needs to be, and an appropriate connection on site is required. Often the (high!) start-up current of the pump is not taken into account, especially when a power set is used. Most pumps are operated in in three phases .
Naipu Slurry Sand Pump can be drived by Motor or diesel. We can help to calculate the Motor power required.
Installation and operation?
Some pumps may only be installed in a dry environment in the pumping station. In contrast, submersible pumps are operated whilst submerged in the medium. The maximum submersion depth is stated in the data sheet. Some can even be mounted in a dry environment. Just ask if they are suitable for permanent operation. Tip: Ensure that the pump has a centrifugal oil lubrication system because these will work perfectly in either horizontal or vertical installation positions.
Should I carry out the maintenance work myself?
Anyone seeking to save money can carry out the most common maintenance tasks themselves on site, thereby ensuring that there are no downtimes because the pumps do not have to be returned to the manufacturer for servicing. Therefore, it is always a good idea to opt for modular pumps.
Naipu Pump is easy to maintenance , and we also can help you to do so and reduce the downtime.
Summary
It is advisable being well prepared when you talk to pump experts, because having the information about the application and local environment at your fingertips will speed up the process considerably.
And then there is the question of the delivery time. This might be decisive because there are only few manufacturers that have large stocks of pumps - most usually produce to order.
anyone who does not know the needs exactly can experiment before investing.
Welcome to contact us
ShiJiaZhuang NaiPu Pump Co.,Ltd
Contact person :Kitty Liu
Mobile/Wechat/ :+86-
Skype: Kitty_Naipump
With competitive price and timely delivery, SHANGLISHI sincerely hope to be your supplier and partner.
Mail: kitty at naipump dot com
Welcome to contact me for slurry pump catalogue and price list .
Do not let a pump run at zero flow
Do not let a pump operate for long periods of time at zero flow. In residential systems, the pressure switch shuts the pump down when the pressure is high which means there is low or no flow.
Do not let a pump run dry, use a check valve
Most pumps cannot run dry, ensure that the pump is always full of liquid. In residential systems, to ensure that the pump stays full of the liquid use a check valve (also called a foot valve) at the water source end of the suction line. Certain types of centrifugal pumps do not require a check valve as they can generate suction at the pump inlet to lift the fluid into the pump.
Suction valves
Gate valves at the pump suction and discharge should be used as these offer no resistance to flow and can provide a tight shut-off. Butterfly valves are often used but they do provide some resistance and their presence in the flow stream can potentially be a source of hang-ups which would be critical at the suction. They do close faster than gate valves but are not as leak proof.
Eccentric reducer
Always use an eccentric reducer at the pump suction when a pipe size transition is required. Put the flat on top when the fluid is coming from below or straight (see next Figure) and the flat on the bottom when the fluid is coming from the top. This will avoid an air pocket at the pump suction and allow air to be evacuated.
Flow control
If you need to control the flow, use a valve on the discharge side of the pump, never use a valve on the suction side for this purpose.
Plan ahead for flow meters
For new systems that do not have a flow meter, install flanges that are designed for an orifice plate in a straight part of the pipe and do not install the orifice plate. In the future, whoever trouble-shoots the pump will have a way to measure flow without the owner having to incur major downtime or expense. Note: orifice plates are not suitable for slurries.
Avoid pockets and high points
Avoid pockets or high point where air can accumulate in the discharge piping. An ideal pipe run is one where the piping gradually slopes up from the pump to the outlet. This will ensure that any air in the discharge side of the pump can be evacuated to the outlet.
Location of control valves
Position control valves closer to the pump discharge outlet than the system outlet. This will ensure positive pressure at the valve inlet and therefore reduce the risk of cavitation.
When the valve must be located at the outlet such as the feed to a tank, bring the end of the pipe to the bottom of the tank and put the valve close to that point to provide some pressure on the discharge side of the valve making it easier to size the valve, extending it&#;s life and reducing the possibility of cavitation.
The right pipe size
The right pipe size is a compromise between cost (bigger pipes are more expensive) and excessive friction loss (small pipes cause high friction loss and will affect the pump performance).
Generally speaking, the discharge pipe size can be the same size as the pump discharge connection, you can see if this is reasonable by calculating the friction loss of the whole system. For the suction side, you can also use the same size pipe as the pump suction connection, often one size bigger is used A typical velocity range used for sizing pipes on the discharge side of the pump is 9-12 ft/s and for the suction side 3-6 ft/s.
Pressure at high point of system
Calculate the level of pressure of the high point in your system. The pressure may be low enough for the fluid to vaporize and create a vapor pocket which will be detrimental to the performance of the system. The pressure at this point can be increased by installing a valve at some point past the high point and by closing this valve you can adjust the pressure at the high point. Of course, you will need to take that into account in the total head calculations of the pump.
Pump pressure rating and series operation
For series pump installations make sure that the pressure rating of the pumps is adequate. This is particularly critical in the case where the system could become plugged due to an obstruction. All the pumps will reach their shut-of head and the pressure produced will be cumulative. The same applies for the pressure rating of the pipes and flanges.
Avoid running pump in reverse direction
Avoid running a pump in reverse direction, pump shafts have been broken this way especially if the pump is started while running backwards. The simplest solution is to install a check valve on the discharge line.
If you want to learn more, please visit our website gravel slurry pump.