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Sand and other abrasives are often a challenge for pump users in the power industry. Clearances on line shaft bearings and bowl wear rings open up, increasing pump vibrations and reducing pump efficiency. Greene, Tweed’s proprietary AR® thermoplastic materials exhibit outstanding wear characteristics in media containing solids.
AR1offers excellent abrasive resistance as well as chemical resistance approaching that of PTFE.AR1is rated from ambient to 120°F (50°C).AR1is easy to machine, and clearance requirements are easily determined.AR1works well in a variety of pumps in the power industry including those working with circulating water, open and closed cooling water and river water as well as screen wash pumps.ARmaterials have performance characteristics that exceed traditional technologies such as cutlass rubber, bronze and carbon materials.
Typical Properties
FEATURES & BENEFITS
Improvement of pump reliability over traditional bearing materials due to lower wear in abrasive media
Nongalling and nonseizing properties help avoid unplanned shutdowns due to pump failures caused by excessive vibration or dry-run startup
Extends lifetime and operation of mechanical seals and pumps due to excellent vibration dampening characteristics
Lower coefficient of friction aids survival in “off design” pump conditions, such as intermittent dry run, better than traditional materials like cutlass rubber
Easy to machine and install to exact finished dimensions, reducing pump repair turnaround times and lowering repair costs
Low hydrolysis or swell makes designing parts easier and helps maintain their physical properties in water applications
Very good physical properties allow the bearings to receive impact from the shaft or shaft sleeve without breaking or cracking during operation
AR® SERIES VS. TRADITIONAL MATERIALS
The chart shows percent weight change (loss) per hour of Greene, Tweed’s ARmaterials compared to traditional materials.
Note: Bearings made from each of the materials (size: 2 in. x 1.5 in. x 1.5 in./ 5.08 cm x 3.81 cm x 3.81 cm) were tested at 900 rpm under 25 psi (0.172 MPa). The run time of the test was eight hours. The test was conducted on 300 series SS shaft, in 95 percent water and 5 percent silica sand. All materials were tested at 70°F (22°C). Additionally, ARHT was tested at 250°F (121°C) in ethylene glycol.
Applications and Availability
APPLICATIONS
Circulating water pumps
Open and closed cooling water pumps
River water pumps
Screen wash pumps
Sump pumps
AVAILABILITY
Greene, Tweed manufactures AR1 machined components world-wide at our own QRCs (Quick Response Centers), dedicated machine centers, making them readily available in short-lead times. Greene, Tweed’s on-site manufacturing capabilities allow us to produce simple or complex parts to our customers’ specifications. Billet sizes range from diameters of 1 in. to 30 in. (2.54 cm to 76.2 cm) with lengths up to 9 in. (22.86 cm) (depending on diameter and wall thickness).
