Desmi DSL Centrifugal Pump For Tugboat Application

Desmi DSL Centrifugal Pump

Desmi DSL Centrifugal Pump For Tugboat Application

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.

The in-line DSL double suction centrifugal pump
Up to 5400 m³/h (23800 US gpm)

The DSL pumps are single-stage, double-suction, vertical, centrifugal pumps. The design of the suction side provides for a perfect flow, and the inlet is placed in line with the outlet. Add to this the advanced double-suction impeller and the result is high efficiency and low NPSHvalues.The DSL series is widely used within different applications and markets.

Design Features
The pumps are fitted with bearings and mechanical shaft seal at both top and bottom. This gives a robust construction, designed for trouble-free continuous duty. The pumps are radially split. In spacer design, service including replacement of bearings and mechanical shaft seal can be carried out without removing motor and piping. Significant advantages to the benefit of the service personnel.

Vertical In-line Double Suction Centrifugal Pump DSL

The DSL pumps are high capacity pumps.
Up to 5400 m3/h, pressure up to 90 mLC at 60 Hz

The DSL pumps are single-stage, double-suction, vertical, centrifugal pumps. The design of the suction side provides for a perfect flow, and the inlet is placed in line with the outlet. Add to this the advanced doublesuction impeller and the result is high efficiency and low NPSH-values.

Application

Ballast and cooling water pumping are among the many tasks that the DSL pumps solve to perfection. But also district heating and power plants together with many other industries will profit from using DSL pumps.

The pumps are fitted with bearings and mechanical shaft seal at both top and bottom. This gives a robust construction, designed for trouble-free continuous duty. The pumps are radially split. In spacer design, service including replacement of bearings and mechanical shaft seal, can be carried out without removing motor and piping. Significant advantages to the benefit of the service personnel. Furthermore, it is possible to supply the pump with a separate priming pumps or ejector.

Material combination
Nominal diameter (DN)	150 to 500
Flow rate	Up to 5400 m³/h (23800 US gpm)
Head	Up to 90 m (295 ft.)
Pressure	Up to 25 bar (363 psi)
Temperature	Up to 150°C (302°F)
Motor	Standard and EX motors
VFD	Bulkhead/Wall-mounted
ATEX approved.

Materials

Alternative material combinations such as stainless steel impeller are available. Maximum working temperature is 120oC for the standard model. For higher temperatures, please contact DESMI. Detailed installation and operation instructions are supplied together with the pump.

Material specification	A	D
Pump casing	Cast iron	Bronze
Impeller	NiAl-bronze	NiAl-bronze
Wear ring	NiAl-bronze	NiAl-bronze
Shaft seal cover	Cast iron	Bronze
Shaft	Stainless	Stainless
Shaft seal	Mechanical	Mechanical

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