Vertical Multistage Centrifugal Pump
LVR(S) series vertical multistage centrifugal pump is widely used to transfer those liquids that are low-viscosity, non-inflammable and non-explosive and contain no solid particles or fibers. LEO centrifugal pumps are characterized by compact structure, great looks, high efficiency, low noise, reliable sealing and simple maintenance etc.
Our vertical multistage centrifugal pumps are increasingly used in the following areas:
Water supply: water supply and drainage for high-rise buildings, water filtration and transfer in waterworks, pressure increase in main pipes
Industry: rinsing and cleaning systems, boiler water supply, cooling water circulation, water treatment systems, auxiliary systems
Water treatment: ultra-filtration systems, reverse-osmosis systems, distillation systems, separators, swimming pools
Agricultural irrigation: sprinkler irrigation, drop irrigation
Food and beverage industries
Fire-fighting system
Operating Conditions of Vertical Multistage Centrifugal Pump
The liquids must not react with the pump materials. When liquids to be pumped have a higher density or viscosity than that of water, a high-power motor should be used.
Liquid temperature: -15℃~+120℃
Flow ranges: 0.4~28m3/h
pH: 3~9
Max. ambient temperature: +40℃
Max. operating pressure: 25bar
Altitude: up to 1000m
Motor of Vertical Multistage Centrifugal Pump
Totally enclosed & fan-cooled motor
Protection class: IP 55
Standard voltage: 50Hz 1X220-230/240V
3X200-220/346-380V
3X220-240/380-415V
3X380-415V
Ambient Temperature of Vertical Multistage Centrifugal Pump
Max. ambient temperature: +40℃.
When ambient temperature is above 40℃ or the centrifugal pump is installed at altitude of more than 1000 meters above sea level, an oversized motor should be used. Because the motor output power P2 will be decreased due to low air density and poor cooling effects. See the picture.
In such cases, it is necessary to use a motor with a higher output power rating.
For example, when the pump is installed at altitude of over 3500 meters above sea level, P2 will be decreased to 88%. When the ambient temperature is 70℃, P2 will be decreased to 78%.
Minimum Inlet Pressure-Push of Vertical Multistage Centrifugal Pump
Calculation of the inlet pressure "H" is recommended in the following situations:
High liquid temperature
The flow is significantly higher than the rated flow.
Water is drawn from depths or drawn through long pipes.
Poor inlet conditions
In order to prevent cavitation, make sure that there is a minimum pressure on the suction side of the pump. The maximum suction lift "H" in meters head can be calculated as follows:
If the "H" calculated is positive, the pump can operate at a suction life of maximum "H" meters head.
If the "H" calculated is negative, an inlet pressure of minimum "H" meters head is required.
Note
To avoid cavitation, never choose a pump with a duty point too far to the right on the NPSH curve.
Always check the NPSH value of the pump at the highest possible flow.
Maximum Inlet Pressure of Vertical Multistage Centrifugal Pump
The following table shows the maximum permissible inlet pressure. However, the max. permissible operating pressure should be higher than the current inlet pressure + the pressure against a closed valve.
If the maximum permissible operating pressure is exceeded, the bearing in the motor may be damaged and the life of the shaft seal may be reduced.
Pump Type | Maximum Inlet Pressure |
LVR1, LVS1 | |
-------------- | 10 [bar] |
LVR3, LVS3 | |
3 – 2 → 3 – 29 | 10[bar] |
3 – 31 → 3 – 26 | 15[bar] |
LVR5, LVS5 | |
5 – 2 → 5 – 16 | 10[bar] |
5 – 18 → 5 – 29 | 15[bar] |
LVR10, LVS10 | |
10 – 1 → 10 – 6 | 8[bar] |
10 – 7 → 10 – 22 | 10[bar] |
LVR15, LVS15 | |
15 – 1 → 15 – 3 | 8[bar] |
15 – 4 → 15 – 17 | 10[bar] |
LVR20, LVS20 | |
20 – 1 → 20 – 3 | 8[bar] |
20 – 4 → 20 – 17 | 10[bar] |
Guidelines
To Performance Curves
Tolerances to ISO 9906, Annex A.
Measurements have been made with airless water at a temperature of 20℃ and kinematic viscosity of 1mm'/s.
Due to the risk of overheating of the motor, the pump should not be used against a high head for a long time.
Minimum Flow Rate
To avoid overheating, the pump should not be used at a flow below the minimum flow rate. The curve below shows the minimum flow rate as a percentage of the nominal flow rate in relation to the liquid temperature.
Note: The outlet valve must be opened when the pump is in operation.
Terminal Box Positions
(Note: set to position 1 before delivery)
MODEL DESCRIPTION | LVR(S)1 | LVR(S)3 | LVR(S)5 | LVR(S)10 | LVR(S)15 | LVR(S)20 | ||||||
LVR1 | LVS1 | LVR3 | LVS3 | LVR5 | LVS5 | LVR10 | LVS10 | LVR15 | LVS15 | LVR20 | LVS20 | |
Rated flow [m3/h] | 1.0 | 3.0 | 5.0 | 10 | 15 | 20 | ||||||
Flow range [m3/h] | 0.6 – 2.4 | 1.2 – 4.5 | 2.5 – 8.5 | 5 – 13 | 8 – 23 | 10.5 – 29 | ||||||
Max. pressure [bar] | 16 | 25 | 16 | 25 | 16 | 25 | 25 | 25 | 25 | |||
Motor power [kW] | 0.37 – 2.2 | 0.37 – 3.0 | 0.37 – 4.0 | 0.37 – 7.5 | 1.1 – 1.5 | 1.1 – 18.5 | ||||||
-20 ~ +120 (Note: Both the Max. Permissible pressure and liquid temperature range refer to the pump capacity. ) | ||||||||||||
Max. pump efficiency [%] | 45 | 55 | 60 | 65 | 70 | 72 | ||||||
Pipe connection | ||||||||||||
Oval flange | ● | ● | ● | |||||||||
DIN flange | ● | ● | ● | ● | ● | ● | ||||||
Inlet / Outlet | G1 | 32 | G1 | 32 | G1 | 32 | 42 | 65 | 65 |
LEO is one of the leading vertical multistage centrifugal pump manufacturers and suppliers in China. GS, CE, UL, ETL, CB, EMC and EMF certification provide proof on the quality of our products. Currently our products such as peripheral pumps, centrifugal pumps, garden shredders and snow throwers etc. are widely used in industries such as petroleum, chemical, pharmaceutical, power, mining, and effluent treatment etc. Additionally, they are sought after in the USA, Germany, Russia, France, Britain, India, Australia, Israel, Brazil, among other countries.
We are looking forward to working with more global customers. You are welcome to contact us!