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MAXIMIZING PUMP EFFICIENCY, MINIMIZING PUMP DAMAGE
18 August 2003 - Greene Tweed & Co Benelux BV
| WR®525 and WR®300 materials help assure successful pump performance. This high level of performance is what customers expect and receive from Greene, Tweed products and systems. Added value comes from Greene, Tweed's experienced engineers and technical field personnel, who work closely with end users and OEMs to make sure their systems achieve top performance. |
WR 525 is a thermoplastic composite consisting of carbon fibre in a PEEK (polyetheretherketone) matrix. This fiber placement technology produces a material that is the ideal upgrade from metallic, carbon, and graphite wear components. The proof is in the performance. WR 525 provides such critical advantages as intermittent dry run capabilities; better strength than steel; low coefficient of thermal expansion; non-galling and non-seizing properties; low coefficient of friction; and excellent resistance to chemicals, impacts, thermal shocks, and hydrolysis. No wonder that WR 525 impeller rings, case rings, bushings are routinely used to replace metals and alloys in multistage pumps. In fact, the WR 525 has strength and wear properties that readily handle pressure velocities in large, high-horsepower, multistage pumps. Recently, when put to an OEM test with 6,000 starts and stops, the WR 525 exhibited no damage and no measurable wear. WR 300 is a long carbon fiber reinforced compression-molded PEEK. Components made of this material deliver superior performance and reliability beyond the reach of metallic wear materials. With a low coefficient of friction and anti-gal / anti-seize characteristics, the WR 300 is ideal for bushings, bearings, and case wear rings in most centrifugal pumps. WR® composite materials exibit outstanding performance in boiler feed, condensate, cooling tower, light hydrocarbon, aromatics, butadiene, and other low-specific-gravity media that have poor lubricating properties. In fact, the anti-gal and anti-seize profile of WR composites limits or eliminates damage when cavitation and/or bearing failure occurs. Additionally, anti-gal and anti-seize properties enable pump operators in many cases to increase pump efficiency by running tighter wear ring clearances. Running closer clearances reduces internal recirculation and has a stabilizing effect on the pumps rotor. When WR composites are properly applied in candidate pumps real gains in reliability and efficiency will be realized.
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About: Greene Tweed & Co Benelux BV
Greene, Tweed specialises in the development, manufacture and supply of rings, seals and profiles for industrial applications in which extremely high specifications are set for the material; brand names include Chemraz, WR and AR. An early product in the portfolio, the G-T Ring, was introduced and approved for use in the landing gear of the F-4 Phantom in 1964. The G-T Ring remains a core product in Aerospace landing gear today. As the business developed, strategy warranted the establishment of corporate headquarters in Kulpsville, Pa., USA. in the 1970s. With this foothold, the company expanded around the globe. In the early 1980s it introduced several versatile elastomers, such as Fluoraz, and designed pioneering product geometries, such as the first "capped seal." Arlon, a tough, high-temperature, semi-crystalline engineering polymer, also joined the product line, followed shortly by one of Greene, Tweed's most innovative products, Chemraz, a chemical-resistant elastomer, effective in the most extreme temperatures. Recognizing the race toward a global economy, Greene, Tweed began geographic expansion by opening offices in Germany, England and France. By the mid 1980s, Greene, Tweed had established a presence in the Pacific with a Japanese office. The Asian market has maintained its pattern of growth with additional offices today in Singapore and Korea. The turn of the century ushered in a new product, Orthtek, a lightweight, thermoplastic composite with high-strength and radiolucent properties, that satisfies the demands of the Medical and Biotechnology industry. Worldwide expansion has continued with new offices in the Netherlands, Italy and Spain. A tradition of creative and innovative ideas has also grown with the development of new products, from new composite technologies and vision systems to fibre optic connectors and extreme electrical connectors. Greene Tweed’s WR and AR product ranges are distributed by Flowserve all over Europe. In Belgium the Greene Tweed & Co products are also distributed by Humitab BVBA in St.Job in ‘t Goor.
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