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White Paper - Pulp & Paper

White Paper - Pulp & Paper
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White Paper Pulp & Paper Market General Information Tuthill manufactures a wide range of positive displacement pumps in the internal gear, circumferential piston and external gear designs. Ranging in capacity from .5 GPH to 550 GPM and available in iron, stainless steel, and other materials. Tuthill pump products lend themselves to a variety of successful applications in the pulp and paper markets, With the GlobalGear® and Technaflo products, Tuthill offers a full range of very low to high flow rate magnetically coupled gear pumps. Magnetically coupled pumps are seal-less, and are used for difficult to seal liquids such as caustics, and for hazardous chemicals such as biocides. The GlobalGear® internal gear design pump offers a heavyduty modular design capable of back pullout access to the fluid chamber without disturbing the piping. The modular design features also minimize maintenance costs and inventory requirements compared to other internal gear pumps. The Tuthill HD Series is a circumferential piston design pump, capable of running dry without damage, handling a wide range of viscosities, slurries, and is a low shear design. This design incorporates the use of externally mounted, synchronized timing gears operating close clearance impellers with external shaft bearing support. It is available in ductile iron and stainless steel construction as standard. The Tuthill Technaflo products include precise, low-flow pumps available in a variety of materials of construction. For adjustable flow, these pumps can readily be supplied with variable frequency drives. These pumps can be supplied with accessories to support a variety of chemical feed control systems. TechnaFlo products are also available in Hastelloy C and Titanium construction. With a closed-loop feedback system, TechnaFlo products provide a pulse free accurate feed of chemicals in processes Black Liquor Soap – Pulp Mills Black liquor soap, a by-product of digestion in a kraft mill, tends to display characteristics such as abrasiveness, air entrainment, and a wide range of viscosities, dependent upon the temperature of the product. These characteristics require the use of a positive displacement pump, and the difficulties presented by the air entrainment and abrasives require the use of the Tuthill HD circumferential piston design pump. The Tuthill HD process pump is commonly used for pumping black liquor soap. Soap has traditionally been handled by gear pumps with short wear life due to meshing teeth on an abrasive fluid combined with system air entrainment. The Tuthill HD product, with its non-meshing impeller and ability to run dry, provides a real advantage on most applications. Tuthill enhances the rugged durability of its HD pumps by interference fitting the timing gears, increasing the pump’s ability to handle the most abusive pumping conditions. In addition, the use of carbon housing bushings provides the selflubricating qualities needed to run dry. Tuthill HD pumps generally are run at speeds of less than 250 RPM, which also adds to the life of the pump. They are used as black liquor soap transfer and power house feeds. For less demanding black liquor soap applications, Tuthill offers the GlobalGear® internal gear product line. It is available with a steam jacket and a variety of sealing arrangements. This product features a back pullout assembly to minimize down time when replacing fluid chamber components. The rotating components and bearing assembly can be removed without disturbing the installation piping. Excellence at work. Excellence in life.

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Tall Oil – Pulp Mills After the black liquor soap is converted to tall oil by a boiling process with sulfuric acid, it becomes a dark brown viscous liquid containing about 95% equal amounts of rosin acids and fatty acids. The tall oil is then processed further for use in protective coatings, inks, soaps, detergents, plasticizers and many other products. It is common to find Tuthill HD and GlobalGear® pumps in distillation plants producing tall oil. They are often used for black liquor soap loading, unloading and transfer; on tall oil loading, unloading and transfer and on pitch transfer and...

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