For more than 150 years, Greene Tweed’s customers have relied on the company’s materials expertise and collaborative approach for the design and manufacture of elastomeric, thermoplastic, and thermoplastic composite solutions to increase meantime between repair (MTBR) and increase operational safety and environmental compliance.
Our seals, engineered components, and thermoplastic composite wear parts deliver proven performance in aggressive media such as hydrocarbons and aromatics, ethylene oxide, inorganic bases, solvents, steam, oxidizing acids, alcohols, sour gases, and amines. Our solutions are found in equipment commonly used in chemical processing including compressors, pumps, mixers, centrifuges, filtration systems, instrumentation, mechanical seals, and valves.
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Chemical Processing Applications and Solutions
A Greene Tweed seal in a centrifugal compressor can help increase reliability and efficiency. Our portfolio includes a variety of geometries, including MSE® lip seals, labyrinth seals, and o-rings. Through careful material selection, seals are optimized for chemical resistance and temperature to minimize the likelihood of unplanned downtime. Our elastomer portfolio includes grades of Chemraz® FFKM and Fusion® FKM qualified for rapid gas decompression (RGD) under the ISO 23936-2 testing standard.
Greene Tweed can provide machined Arlon® and Avalon® parts for use in reciprocating compressors. Products include piston and rider rings, valve plates, and valve poppets.
Greene Tweed offers a variety of products for the instrumentation market, including support rings, clamping rings, support bodies, housings, insulators, and more. Manufactured from our proprietary portfolio of materials, our engineered solutions are installed to increase reliability in pressure transducers, level or temperature transmitters, flow meters, and liquid analytical instruments such as conductivity sensors and DO or ORP sensors.
Greene Tweed’s mechanical seal solutions:
- Increase overall equipment reliability
- Withstand upset conditions
- Enable standardization
- Reduce total cost of ownership
Greene Tweed offers a variety of elastomers for o-rings used as secondary seals within a mechanical seal. Chemraz® provides the broadest chemical compatibility range of all elastomers, with a high temperature capability up to 615°F (324°C). Fusion® and Fluoraz® are typically chosen for chemical compatibility performance and temperatures up to 450°F (232°C). For low-temperature performance, Xyfluor®, a proprietary highly fluorinated elastomer, offers best-in-class performance down to -76°F (-60°C). Lip seals and MSE® seals may be recommended for high-pressure applications that require robust resistance to a variety of chemicals.
Arlon® 4020 labyrinth seals are a suitable solution to eliminate sealing corrosion in dry gas seals. A Greene Tweed engineer can recommend the appropriate material and secondary seal geometry.
In addition to a variety of sealing options, Greene Tweed offers pump components engineered from our high-performance thermoplastic composite materials for centrifugal pumps and seal-less (magnetic drive and canned motor) pumps. In challenging chemical processing environments, components must withstand aggressive media across a wide range of application parameters, including abrasive and corrosive liquids.
These fluids can cause damage leading to machinery failure and costly downtime. In centrifugal pumps, wear materials act as a buffer between rotating and stationary parts that are traditionally metallic. To avoid galling and possible equipment seizure, dynamic metal clearances are set at a generous minimum as an industry standard. Non-metallic wear parts, such as those manufactured from Greene Tweed’s thermoplastic composites, enable smaller dynamic clearances. A smaller dynamic clearance has two distinct advantages. First, the reduced clearance restricts the recirculation of process media, thereby improving system efficiency. Second, the reduced clearance generates increased fluid pressure around the shaft, resulting in shaft stabilization and reduced system vibration.
For more than two decades, our best-in-class thermoplastic composite WR® and AR® components have performed successfully while extending MTBR in chemical processing environments in API and ANSI pump configurations.
Greene Tweed offers solutions for valves that reduce leakage and fugitive emissions and optimize performance.
We offer elastomeric seals, valve seats, bushings, and stem seals, engineered for a variety of valve types, including ball valves, needle nose valves, gate valves, globe valves, check valves, instrumentation valves, and more. Greene Tweed’s Arlon® and Avalon® materials are extensively used as valve seats in demanding valve applications. Our knowledge of these materials and their behavior during molding and machining processes enable us to produce parts with consistent material characteristics and very close dimensional tolerances, resulting in lower deformation under load (creep), lower leakage rates, and higher temperature ratings.