Gregg E. Johnson, Sr. Global Product Manager, Masterflex Bioprocessing, USA.
Pulp & paper operations continuously handle abrasive slurries and highly aggressive chemicals – and this creates huge demands on pumping systems. The recovery of back liquor soap, for example, contains particulate matter, is abrasive, hot, and entrained gases can cause seal failure in certain pump designs. Lime slurries used to produce bleach liquor can easily settle out and clog valves. In addition, maintaining precise, consistent, repeatable flow rates often present major challenges for the metering of dyes, sizing agents, retention aids, and other chemicals.
Masterflex® L/S® Series peristaltic pumps, are impervious to highly abrasive fluids and gentle on shear sensitive materials. Handling tough, viscous slurries are never a problem due to the pump’s high suction lift capabilities. Plus, there are no glands, valves, or seals to become clogged or wear out. These peristaltic pumps can also run dry. And, unlike many pump designs used in pulp & paper processes, these maintain a precise, constant flow rate with excellent repeatability – providing volumetric accuracies of ± 0.5% of liquid volume, or better.
Masterflex hose pumps provide pulp and paper operations with extremely versatile liquid chemical feed and fluid handling solutions with the highest reliability, volumetric accuracy, and long-term operation, plus simple, low maintenance. Masterflex L/S peristaltic pump systems are ideal for handling virtually any chemical, slurry, and additive at pulp and paper operations. The only material the fluid touches is the inside of the tubing, and since no other parts of the pump ever contact the solution, only the tubing ever needs to be cleaned or changed, which is a very quick and simple procedure.
Masterflex L/S pumps are the ideal solution for efficiently carrying out the demanding bulk transfer and chemical metering applications of pulp & paper manufacturers. Aggressive materials, such as phosphoric acid, soda ash and sodium nitrate solution, or Kaolin and clays containing latex and abrasive silica, can lead to defective valves and premature pump wear on other pump types. However, these materials remain inside the pump’s hose or tubing at all times and cannot contaminate and damage the pump or meter. The pump’s non-intrusive design provides a straight flow path with no dead flow areas for slurry to agglomerate, harden, and contaminate the process. Flow rates are accurate up to ± 0.5%. These pumps are innovative, cost-effective peristaltic pumping systems which exhibit low shear force, so it’s gentle on polymers and shear-sensitive slurries, and its variable speed operation allows for precise control of flow or pressure over a wide operating range to maintain process integrity. For metering process sensitive materials, such as dyes, optical brightening agents, and retention aids, Masterflex pumps provide high accuracy, repeatability, and reliability, especially when compared to diaphragm metering pumps, which often cause excessive downtime for cleaning, stripping and repair. A well-balanced range of capacities and flexibility combines with excellent repeatability and optimal chemical resistance to provide for precision, high reliability and long-term operation for handling virtually all chemical products for pulp & paper production.