Soap manufacturing is no longer one-size-fits-all. So the pumps you employ need to be adaptable, explains Mark Pyk of Blackmer...
Soaps and detergents serve as an imperative part of our lives, one that would make life much more challenging without modern advances. Before the days of stacked shelves with a wide variety of cleaning choices, soaps were simply a combination of boiled fats, oils and ashes.
During World War I, however, a shortage of fats led to the invention of synthetic detergents, which evolved into manufacturers producing the varieties we see today. Soap and detergent production now consists of merging fatty acids with alkali, glycerin or sulfuric acid.
The soap and detergent market has four segments – laundry and fabric washing; household cleaners; personal cleansing products; and dishwashing cleaners. With this variety of cleaners, manufacturers need equipment that can process a wide range of raw materials, each with its own complexities.
The composition of sliding vane pumps makes them ideal for soap and detergent manufacturing. Sliding vane pumps feature a rotor with retractable vanes that protrude and retract as the rotor operates. This setup creates chambers for liquid to pool into, while the next vane pushes it to the discharge side of the pump.
Self-adjusting sliding vanes sustain the pump’s volumetric performance, making the pump energy efficient while also preventing product slip. While vanes do wear over time, a worn vane simply protrudes further out of its rotor slot, ensuring that tight internal clearances remain consistent. The pump’s ability to sustain volumetric consistency ensures that it will run effectively and efficiently over its lifetime.
Another feature is the lack of metal-to-metal contact, commonly found in other pumping technologies, such as gear pumps. When metal-to-metal contact occurs frequently, the possibility of pump friction and galling increases. Sliding vane pumps don’t suffer from these problems due to their construction, which also aids in the pump’s longevity.
Sliding vane pumps can also handle liquids with viscosities as low as 0.2 cP and as high as 22,500 cP, while also experiencing no adverse performance effects when processing liquids between 3 to 100 cP and 100 to 5,000 cP.
Additionally, they can handle liquids with small particulates up to 25% concentrations, a useful attribute when disposing of waste fats after manufacturing soap; shear-sensitive open flow paths within the pump chamber and slow internal flow velocities that gently pass solids through the internal flow stages. The particles are not moved violently through the pump casing, as is the case with pump styles that rely on high internal flow velocities to operate effectively.
Another attribute is their self-priming ability and their suction lift capabilities. This pump technology can create an internal vacuum strong enough to strip and lift valuable soap and detergent materials out of the lines, pumps and tanks. Operators don’t have to worry about losing raw materials and processed ingredients inside their equipment.
Sliding vane pumps also are available in materials that work well with the soap and detergent manufacturing process. Housings are available in stainless steel or ductile iron, while the vanes themselves can be made from a variety of materials that pair well with soaps and detergents.
Sliding vane pumps’ ability to handle multiple liquids with different viscosities, as well as their volumetric efficiency and consistency with several raw materials, make them a reliable choice for manufacturers.
Mark Pyk is marketing communications manager for Blackmer