Desmi Centrifugal Pump For Offshore Type ESL
Metering pump, as the name suggests, is a type of pump which is used on a ship not only to transfer a liquid from one place to another but to supply it in a precise volume. Metering pump can be adjusted to provide different flow rates. They are generally used when the precision of volume to be delivered is very important.
The marine application of metering pump is in the form of chemical dosing pumps, which is used to transfer precise amount of dosing chemicals, especially in boilers. They are also used for dosing chemical additives to protect corrosion in the cooling water system. It is to note that the amount of dosing has to be precise. Overdosing or under-dosing may cause corrosion and other damages inside the boiler, which may end up in heavy repairs.
The metering pump is connected to the system in which the chemicals are injected with the help of valve in the pipeline. The pressure produced by this pump should be higher than the pressure in the pipeline, or else there will not be any dosing and the level of chemicals in the dosing tank will be the same.
The metering pumps consist of a small motor, which moves the plunger, in and out of the barrel, to provide pressure in the system. The check valves are provided in the suction and discharge side of the pump. A plunger type metering pump is a positive displacement pump and is suitable to use in a high-pressure system.
As this type of pump is frequently used to dispense concentrated and highly corrosive liquids, considerable care must be taken to ensure that the materials used in construction, particularly those of parts in direct contact with the liquid, are capable of resisting chemical reaction and corrosion.
ESL Centrifugal Pump
Desmi ESL Centrifugal Pump Design Features
ESL pumps are single-stage centrifugal pumps equipped with mechanical shaft seal for maximum life and minimum friction loss. ESL pumps are single-stage centrifugal pumps with connecting flanges according to international standards. Further the pumps can be fitted with electric motors with flange dimensions also according to all international standards.
High-Efficiency Vertical In-line Centrifugal Pumps
High-efficiency In-line centrifugal pumps
Up to 200 m³/h (880 US gpm)
DESMI ESL vertical in-line centrifugal pump is designe for special marine and offshore requirements in regard to :
• High efficiency
• Low NPSH
• Compact design
• Easy installation
• Low maintenance costs
Application areas
• Hot water circulation
• Fresh water circulation
• Refrigeration
• HVAC
• Hydrophore pump
• Cooling water
• The pump can be equipped with an air-driven or electrically driven priming device.
| Nominal diameter (DN) | 65 to 400 |
| Flow rate | Up to 200 m³/h (880 US gpm) |
| Head | Up to 65 m (210 ft) |
| Pressure | Up to 30 bar (435 psi) |
| Temperature | Up to 150°C (302°F) |
| Motor | Standard and EX motors |
| VFD | Direct or Bulkhead/Wall-mounted |
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Material specification
| Material specification |
A | D |
| Pump casing | Cast iron | Bronze (RG 5) |
| Impeller | Bronze (RG 10) |
Bronze (RG 10) |
| Wear ring | Bronze (RG 10) |
Bronze (RG 10) |
| Shaft | Duplex St. steel (1.4460) |
Duplex St. steel (1.4460) |
| Shaft seal | Mechanical | Mechanical |
The pumps are also available in other materials such as e.g. impeller in ducktile iron and various bronze alloys.
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