Energy Efficient Shroud Selection

Most shrouds of metallic, sealless magnetic drive pumps are made of metal because the choice of pump material automatically dictates the choice of shroud material. Magnets on each side of the shroud transfer the energy from the rotor on the atmospheric side to the rotor on the medium side through the metallic shroud. Depending on the material, size and thickness of the shroud, energy is wasted through eddy current losses caused by forcing eddy currents through a metallic constriction.

CP’s standard shroud on its metallic magnetic drive pumps

The pumps in the MKP series are metallic, sealless magnetic drive centrifugal pumps built to EN-22858. They use the reverse drive principle, having the magnetic rotor on the outer diameter of the shroud and the driven magnet on the inner and atmospheric side of the shroud. The impeller rotates about a stationary axis integrated in the suction side of the casing, minimising axial and radial forces and thus making the conventionally required second bearing redundant. MKP pumps need just one single bearing and consequently have fewer parts. This gives users of CP pumps an unrivalled advantage since they require a far smaller inventory of spare parts and can minimise their maintenance costs.

CP’s non-metallic shroud on its metallic magnetic drive pumps

CP offers a non-metallic shroud for the MKP series as a cost neutral solution to improve the energy efficiency of magnetic drive pumps by eliminating eddy current losses. Compared to the metallic shrouds typically used, this gives end-users the following benefits:

• No eddy currents are generated in the shroud during operation.
• Due to lower energy requirements, outdated chemical process pumps with mechanical seals can be replaced with sealless magnetic drive MKP pumps without changing the motor power requirements.
• The overall efficiency of existing CP pumps can be significantly increased by replacing existing shrouds with non-metallic shrouds to eliminate eddy current losses.
• As pumps with non-metallic shrouds require less energy, smaller motors can be used, which in turn reduces capital costs.
• CP's non-metallic shrouds have the same dimensions as the existing metallic shrouds so retrofitting is possible.
• The non-metallic shroud is designed for PN16 or PN25, identical to that on the MKP pumps. This special shroud has good chemical resistance and can be used at temperatures up to 200°C.
• Use of non-metallic shrouds does not generate additional costs.

Non-metallic shrouds on metallic, sealless magnetic drive centrifugal pumps will reduce your energy costs. This is why CP offers you a wide range of MKP sizes fitted with a non-metallic shroud.

CP offers non-metallic shrouds for the following metallic magnetic drive pumps

• MKP
• MKTP