Description

CEM – CE cast iron centrifugal pumps

CEM CE electric cast iron centrifugal pumps with marine painted cast iron head and impeller, widely used in the nautical sector to transfer and/or deliver freshwater where a large flow rate is needed such as air conditioning, HVAC, fuel transfer, cooling and circulation

A centrifugal pump is a mechanical device designed to move a fluid by means of the transfer of rotational energy from one or more driven rotors, called impellers.  Fluid enters the rapidly rotating impeller along its axis and is cast out by centrifugal force along its circumference through the impeller’s vane tips.  The action of the impeller increases the fluid’s velocity and pressure and also directs it towards the pump outlet.  The pump casing is specially designed to constrict the fluid from the pump inlet, direct it into the impeller and then slow and control the fluid before discharge

What are the main features of a centrifugal pump?

There are two main families of pumps: centrifugal and positive displacement pumps. In comparison to the latter, centrifugal pumps are usually specified for higher flows and for pumping lower viscosity liquids, down to 0.1 cP. In some chemical plants, 90% of the pumps in use will be centrifugal pumps. However, there are a number of applications for which positive displacement pumps are preferred.

What are the limitations of a centrifugal pump?

The efficient operation of a centrifugal pump relies on the constant, high-speed rotation of its impeller. With high viscosity feeds, centrifugal pumps become increasingly inefficient: there is greater resistance and a higher pressure is needed to maintain a specific flow rate. In general, centrifugal pumps are therefore suited to low pressure, high capacity, pumping applications of liquids with viscosities between 0.1 and 200 cP

Slurries such as mud, or high viscosity oils can cause excessive wear and overheating leading to damage and premature failures. Positive displacement pumps often operate at considerably lower speeds and are less prone to these problems

Any pumped medium that is sensitive to shearing (the separation of emulsions, slurries or biological liquids) can also be damaged by the high speed of a centrifugal pump’s impeller. In such cases, the lower speed of a positive displacement pump is preferred

A further limitation is that, unlike a positive displacement pump, a centrifugal pump cannot provide suction when dry: it must initially be primed with the pumped fluid. Centrifugal pumps are therefore not suited to any application where the supply is intermittent. Additionally, if the feed pressure is variable, a centrifugal pump produces a variable flow; a positive displacement pump is insensitive to changing pressures and will provide a constant output. So, in applications where accurate dosing is required, a positive displacement pump is preferred

CE cast iron centrifugal pumps MOTOR DETAIL:
Direct current: 

• Permanent magnet motor 12/24V DC
• Protection IP23-44
• Insulation Class F
• Continuous Duty (S1)

Alternating current:

• Induction electric motor
  • 110V single-phase (MS) – 60Hz (available on request)
  • 230V single-phase (M) – 50Hz (60hz available on request)
  • 230~400VAC Three-phase – 50Hz (60hz available on request)
• Protection IP54÷55
• Insulation Class F
• Continuous Duty (S1)

Scope of operation: Liquid free of solid impurities
Temperature range of the liquid: from + 0 to + 50 °C.
Max. suction depth: 7 m
Static pressure inside the pump body: 6 bar max.

About CEM Pumps and Blowers

Established in 1970 C.E.M. elettromeccanica S.r.l. has been a leading manufacturer of electric pumps and DC motors primarily focussed for use in the maritime sector
In the 48 years, we have been making motors and our constant expansion in the national and the international markets have resulted in the broadening of our extensive product range

…highest quality materials…design…innovative production processes…remarkable lifespan…

This makes us the ideal partner for large and medium-sized boat builders of pleasure, fishing and military vessels.

Our extensive range now includes:

• DC and AC electric pumps
• Belt driven pumps, with manual or electromagnetic clutch
• hydraulically driven pumps
• water pressure systems
• centrifugal and axial blowers
• diesel driven pumps
• manual pumps
• DC motors

Our commitment to using the highest quality materials used, the special care invested in the design and in the innovative production processes we adopt, we are able to offer excellent performances and a remarkable lifespan of our products exactly what you need when our product can offer extra hours of safety when in difficulty

The CEM factory is based in Nonantola close to Modena in Italy and is a family-owned business with generations of experience in the manufacture of pumps, blowers and electric motors

All of our products are built to standards that are in accordance with classification and certification can be obtained from each of the bodies: Bureau Veritas, Det Norske Veritas (DNV), Lloyd’s Register and RINA