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KSB Magnochem pumps reduce the risks in pumping lye

KSB Magnochem magnetic drive pumps have now been introduced by Freudenberg for the manufacture of its Wettex sponge cloths in Norrköping.

Caustic lye pumping; sodium hydroxide pumping; leakage prevention; sealless pumps; magnetic drive pumps;

The project: Improving lye pumping at Freudenberg

Manufacturing Wettex sponge cloths involves many processes.  In one of these cellulose is dissolved in a tank together with lye (NaOH) to a slurry. The slurry is then pressed away and the cellulose continuous in the process to become viscose. The removed lye is re-used and pumped back into the storage tank. KSB magdrive pumps have now replaced the old pumps used on feeding the mixing tank and recirculating the reclaimed NaOH. By this, a potential leakage has been eliminated.

The client: Freudenberg Home and Cleaning Solutions AB

Vileda Wettex®, is one of the most internationally recognized household brands, alongside others such as Vileda®, O'Cedar®, Gala® and Swash®. The division Freudenberg Home and Cleaning Solutions GmbH (FHCS) are divided into the Consumer Division (approx. 85% of sales) and the Professional Division. FHCS is a subsidiary of the Freudenberg Group, an international family-owned German company with over 170 years of history.

The challenge: Risk-free pumping at Freudenberg Norrköping

To deliver a pumping solution for the safe and risk-free handling of sodium hydroxide and soda lye using sealless pumps. These pumps should be capable of operating efficiently in order to ensure optimum use of the pumped fluid, simple maintenance and optimized running costs.

The criteria was that it shall be a sealless magnetic coupled pump with good quality.

Pump design and operating requirements:

  • 2 x Magnochem MAC050 pumps, one base plate mounted and one close-coupled surface mounted. Product handled: soda lye in concentrations of 20 and 10 percent at flow rates of 8m³/h and 4m³/h.
  • 2 x Magnochem MAC080 pumps, close-coupled and surface mounted. Product handled: sodium hydroxide in 20 per cent concentration at flow rates of 30m³/h.

All pumps with a requested pressure capability of 16bar and supplied with IE3 electric motors.

KSB’s Magnochem handles the pumping of the sodium hydroxide and soda lye.

Before cutting the sponge cloth into correct widths, it has to be washed in large basins containing caustic.

The solution: Magdrive sealless pumps

KSB Sweden offered the Magnochem pump, its features and benefits being quickly recognized by the customer as being best suited to the application. The pumps have now been running for two years.
Leakage can be avoided by using magdrive sealless pumps because their concept gives the advantage of having only two static seals, which ensures a high degree of security. KSB has paid particular attention to the design of the magnetic coupling and the routing of circulation, cooling and lubricating flows. This allows the operator to choose between four operating modes ranging from a simple internal circulation to a so-called dead-end configuration with an auxiliary hydraulic system. As an option, an external heat exchanger can be installed. This means that the pump set can be optimized for the pumping of polymerizing, coagulating and crystallizing as well as low-boiling fluids.

The cans are available in metals such as Hastelloy or Titanium and can also be made of zirconium oxide depending on customer requirements. The latter is extremely resistant to corrosion and does not produce eddy currents when a magnetic field passes through it. Unnecessary heat losses which would reduce output and compromise pump efficiency are thus eliminated. The engineers have selected samarium-cobalt as a material for the magnets as it is highly temperature-resistant and has excellent magnetic characteristics.

Diamond-coated plain bearings ensure effective anti-seizure properties in the event of insufficient lubrication, a feature which, combined with an optimised arrangement of the radial plain bearings, is particularly beneficial in ensuring the pump’s operating reliability. Multiple coupling dimensions are available for each pump size, avoiding the need for oversized magnetic drives. The pumps feature very low vibration levels during operation as each pump rotor is subjected to static and dynamic balancing in the manufacturing process.

At the motor end, optional leakage barriers such as shaft seal rings offer an additional level of reliability and protect the generously dimensioned rolling element bearings as well as the environment from any fluid escaping. The space around the rotor can be monitored using sensors.

As well as the conventional version in back pull-out design, a close-coupled variant is available in 44 sizes for installation in confined spaces. The Magnochem series offers flow rates up to 1,400 m3/h at a maximum head of 233 meters, with operating temperatures ranging from -90°C to +300°C.

Right now just four new pumps are being used on this process. As a bonus, the company is also saving Freudenberg 2000€ a year as a result of changing to the new KSB pumps. Eventually older pumps from other manufacturers will be replaced with KSB pumps on a range of applications as and when required.

Data I Facts I Figures

  • Location: Norrköping, Sweden
  • Client:
    FHCS Norrköping is a company belonging to the Freudenberg Group – a global technology group with around 50,000 employees in some 60 countries and annual sales of more than 9.4 billion euros in 2018.The figures are taken from the latest Annual Report.
    Key Figures 2018
  • Area of application: Pumping of lye at the production of sponge cloths

KSB : un des leaders du marché mondial des pompes et de la robinetterie industrielles

Fondée en 1871 à Frankenthal (Allemagne), l’entreprise KSB compte parmi les principaux fabricants de pompes et de robinetterie industrielles depuis plus d’un siècle. Avec plus de 15 500 employés dans le monde entier ainsi que ses propres filiales, sites de production et entreprises de Service, KSB développe et fabrique des pompes sur mesure destinées aux applications les plus diverses.

Les produits du fabricant de pompes expérimenté sont utilisés dans les domaines du bâtiment et de l’industrie, du transport de l’eau et de l’épuration des eaux usées ainsi que dans les processus des centrales électriques. Grâce à un programme innovant de recherche et de développement, KSB est en mesure de satisfaire les exigences les plus variées de sa clientèle. Le fabricant de pompes KSB est renommé pour sa grande expérience et son savoir-faire technique.

Le fabricant de pompes KSB : la solution idéale pour votre installation
Les pompes et la robinetterie industrielles de KSB se prêtent à une large gamme d’applications et offrent un excellent rendement énergétique. Les produits KSB se caractérisent par une technique très innovante et font leurs preuves depuis de nombreuses années dans des installations. C’est le cas notamment de la pompe à eau normalisée Etanorm : avec plus de 1,5 million de groupes motopompes vendus, ce modèle compte parmi les pompes à eau normalisées ayant le plus de succès au niveau mondial.

Les pièces de rechange et les prestations de Service de KSB garantissent la sécurité de fonctionnement des pompes et de la robinetterie industrielles de la marque. L’hydraulique, le génie des matériaux et l’automatisation sont les atouts technologiques du fabricant de pompes KSB et c’est là que réside la clé du succès de ses pompes haute performance.

Un Service compétent dès le début
Grâce à ses nombreux sites de production, le fabricant de pompes KSB assure la proximité avec ses clients et leur garantit un Service de très haut niveau. Des spécialistes certifiés, riches d’une longue expérience, sont les garants d’une excellente qualité. Le Service KSB prend en charge la mise en service, l’inspection, l’entretien et la maintenance de vos pompes, de votre robinetterie et de l’ensemble de vos installations directement sur site. KSB assure également la livraison rapide de pièces de rechange pour vous fournir directement le meilleur Service possible.