Finish Thompson DB Pumps Help Make Fishing Tackle

Wright McGill, manufacturer of Eagle Claw Fishing Tackle, is using Finish Thompson DB pumps in demanding metal-finishing applications. The company produces millions of high-quality fishhooks every year in styles and colours that require efficient precision metal-finishing processes. These processes include nickel, electroless nickel (EN), tin, brass, zinc, bronze and even gold plating. In addition to plating, Wright McGill's metal-finishing processes include washing, heat-treating and the application of various paint-type coatings.

In 2005, Finish Thompson completed the design of its latest magnetic drive pump, the DB Series, which features engineered plastics and other specialised materials to ensure optimum corrosion resistance. It also benefitted from the latest engineering technology, including computational fluid dynamics, finite element analysis and custom magnetic-design software. To complete the development and testing process, Finish Thompson needed an appropriately demanding test site and the Eagle Claw manufacturing site was happy to oblige.

One of the processes involved concentrated nitric acid, used as a stripping agent to remove built-up plating materials on barrels and other items used in plating processes. Nitric acid is extremely aggressive and highly oxidising; it is capable of dissolving most metals. It also has a severe effect on many other materials. Eventually, the nitric acid became saturated with the various plating products removed during the stripping process and engineers started to look at ways of reducing its use.

This led to the installation of the DB Series pump on a trial basis, within a filtration system that was designed to recycle the nitric acid. A DB test pump was manufactured from corrosion-resistant materials, including precision-moulded carbon-fibre filled PVDF, PTFE bushing, and powerful neodymium drive magnets encapsulated in pure PVDF. It was then installed in the nitric-acid recycling system. Once installed on the filtration system, it was used to circulate approximately 680 litres of nitric acid through a series of filters, with each filter removing progressively smaller particles.

The goal was to re-circulate the tank about three times per hour until the nitric acid was clean enough for reuse. The pump was in regular operation for six months while the effectiveness of the filtration process was evaluated. Due to the excellent performance and reliability of the pump in that test, Wright McGill continues to use Finish Thompson magnetic-drive pumps for handling corrosive and hazardous fluids in applications throughout its facility. As a result of the non-metallic materials used for both the housing and all the key wetted components, DB pumps are ideal for transferring corrosive liquids in chemical manufacturing, metal plating, surface treatment, wastewater treatment, electronics manufacture or anywhere that hazardous liquids need to be pumped safely.

They are available in a close-coupled design configuration for optimum magnet alignment and provide extended dry-running capability when specified with a carbon bushing; they are therefore protected from system upsets. Other benefits include high operating efficiency, resulting in lower energy consumption and improved hydraulic coverage for both 50 and 60Hz operation. They have evenly spaced impeller trims, enabling duty points to be precisely met and a two-piece impeller design that allows the impeller or inner drive magnet to be individually replaced.

The DB pumps also offer high working-pressure capability, which means fluids with a high specific gravity can be easily pumped without the need for impeller trimming. The pumps are designed for either horizontal or vertical installation (vertical when equipped with an IEC motor). They have a maximum operating temperature of 180F (82C) for the polypropylene model and 220F (104C) for the PVDF option.

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