AFB (Air Fan Bearing) Assembly
2
Product Brochure Features and Benefits • Unique, patent-pending split design eliminates disassembly require- ments to streamline repair and reduce costs • Universal, turn-key solution requires no equipment modifications • Improves MTBF (mean time between failures) for decreased maintenance • Lowers life cycle cost of ACHE fans and avoids unplanned shutdowns • Non-galling WR ® 600 sleeve will not damage shaft and provides dry-run capability Applications Upper roller bearing replacement for ACHE fans found in refineries, chem- ical and gas processing plants, and power generation facilities. Patent-Pending Split Design In refineries, chemical plants, and power generation plants, essential process fluids are cooled by forcing air through a heat exchanger with a fan. These ACHE fans (Air-Cooled Heat Exchangers) use roller bearings to support the shaft that, due to the environment in which they operate, usually experiences short lifetimes and frequent failures. These failures cause plant shutdowns with potential losses of up to 25 percent of refining capacity. In addition, replacement of these bearings requires that the fan unit be completely disassembled – a process that can exceed $20,000 per repair and take 2–3 days to complete. Greene Tweed’s AFB assembly addresses this challenge, providing a turn-key solution that dramatically reduces maintenance requirements and replacement costs. Developed with a patent-pending split design, Greene Tweed’s AFB assembly consists of a WR ® 600 sleeve with MSE ® seals and a locking ring contained in a one-piece metallic housing. The unique split design eliminates the need to disas- semble the fan unit, reducing repair turnaround time from 2–3 days to less than four hours. Shaft seals prevent the ingress of dirt and moisture, and the non- contact bearing design minimizes wear for extended life. In addition, the non-galling WR ® 600 sleeve enables dry-run capability and will not damage the shaft in case of bearing failure. The result is an overall reduction in life cycle cost of the ACHE fan through less maintenance, easier repair, and avoidance of unplanned shutdowns. Life-Cycle Cost Impact The original contact bearing required three repairs within a 60-month period, totaling nearly $70,000 in costs. Greene Tweed’s AFB assembly was repaired once during the same 60-month period, with costs remaining under $25,000. On a site with 400 units, upgrading the lowest performing 20% (80 units) improved life-cycle cost by $3.4 million over five years. www.gtweed.com Statements and recommendations in this publication are based on our experience and knowledge of typical applications of this product and shall not constitute a guarantee of performance nor modify or alter our standard warranty applicable to such products. © 2018, Greene Tweed all rights reserved. All trademarks are property of their respective owners. 08/18-GT DS-US-PP-112 Contact Us Greene Tweed Houston, TX, USA Tel: +1.281.765.4500 Fax: +1.281.821.2696 AFB assembly 70,000 60,000 50,000 40,000 30,000 20,000 10,000 0 Bearing cost $24,000 $66,000 Initial changeout cost Additional change out cost Old bearing Greene Tweed AFB Life-C ycle Cost per ACHE Fan within a 60-month Period AFB (Air Fan Bearing) Assembly Turn-Key Solution Reduces Installation and Maintenance Costs
Transcript of AFB (Air Fan Bearing) Assembly
Product Brochure
Features and Benefits• Unique, patent-pending split design
eliminates disassembly require-ments to streamline repair and reduce costs
• Universal, turn-key solution requires no equipment modifications
• Improves MTBF (mean time between failures) for decreased maintenance
• Lowers life cycle cost of ACHE fans and avoids unplanned shutdowns
• Non-galling WR® 600 sleeve will not damage shaft and provides dry-run capability
ApplicationsUpper roller bearing replacement for ACHE fans found in refineries, chem-ical and gas processing plants, and power generation facilities.
Patent-Pending Split DesignIn refineries, chemical plants, and power generation plants, essential process fluids are cooled by forcing air through a heat exchanger with a fan. These ACHE fans (Air-Cooled Heat Exchangers) use roller bearings to support the shaft that, due to the environment in which they operate, usually experiences short lifetimes and frequent failures. These failures cause plant shutdowns with potential losses of up to 25 percent of refining capacity. In addition, replacement of these bearings requires that the fan unit be completely disassembled – a process that can exceed $20,000 per repair and take 2–3 days to complete. Greene Tweed’s AFB assembly addresses this challenge, providing a turn-key solution that dramatically reduces maintenance requirements and replacement costs. Developed with a patent-pending split design, Greene Tweed’s AFB assembly consists of a WR® 600 sleeve with MSE® seals and a locking ring contained in a one-piece metallic housing. The unique split design eliminates the need to disas- semble the fan unit, reducing repair turnaround time from 2–3 days to less than four hours. Shaft seals prevent the ingress of dirt and moisture, and the non- contact bearing design minimizes wear for extended life. In addition, the non-galling WR®600 sleeve enables dry-run capability and will not damage the shaft in case of bearing failure. The result is an overall reduction in life cycle cost of the ACHE fan through less maintenance, easier repair, and avoidance of unplanned shutdowns.
Life-Cycle Cost ImpactThe original contact bearing required three repairs within a 60-month period, totaling nearly $70,000 in costs. Greene Tweed’s AFB assembly was repaired once during the same 60-month period, with costs remaining under $25,000. On a site with 400 units, upgrading the lowest performing 20% (80 units) improved life-cycle cost by $3.4 million over five years.
www.gtweed.com
Statements and recommendations in this publication are based on our experience and knowledge of typical applications of this product and shall not constitute a guarantee of performance nor modify or alter our standard warranty applicable to such products.
© 2018, Greene Tweed all rights reserved. All trademarks are property of their respective owners. 08/18-GT DS-US-PP-112
Contact UsGreene Tweed Houston, TX, USA
Tel : +1.281.765.4500Fax: +1.281.821.2696
AFB assembly
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
Bearing cost
$24,000
$66,000
Initial changeout cost Additional change out cost
Old bearingGreene Tweed AFB
Life-Cycle Cost per ACHE Fanwithin a 60-month Period
AFB (Air Fan Bearing) AssemblyTurn-Key Solution Reduces Installation and Maintenance Costs
www.gtweed.com
Statements and recommendations in this publication are based on our experience and knowledge of typical applications of this product and shall not constitute a guarantee of performance nor modify or alter our standard warranty applicable to such products.
© 2018, Greene Tweed all rights reserved. All trademarks are property of their respective owners. 08/18-GT DS-US-PP-112
Contact UsGreene Tweed Houston, TX, USA
Tel : +1.281.765.4500Fax: +1.281.821.2696
Installation References
RefineryLocation
PreviousMTBF
*Greene Tweed
Installed AFB
Months in Service
as ofSeptember
2013
Increasein Life
Texas 13.5 June 2010 39 3x
Texas 13.5December
201034 2.5x
Texas 13.5February
201131 2.3x
Louisiana 21January 2011
32 1.5x
Louisiana 15 March 2011 30 2x
Part Numbers
ACHE Shaft Size (in.), Maximum Part Number
2 7/16 AFB – 2437
2 11/16 AFB – 2687
2 15/16 AFB – 2937
Repair Kit Part Numbers
ACHE Shaft Size (in.), Maximum Part Number
2 7/16 AFBR – 2437
2 11/16 AFBR – 2687
2 15/16 AFBR – 2937
Current Installations
*As of September 2013, all installations were performing as anticipated with enhanced rollout programs under discussion. Simulated second fit bearing installation and set-up time were confirmed at less than1 hour.
The first AFB assembly was installed in June 2010. It had been running for 39 months as of September 2013 –twice as long as the previous MTBF. Subsequent installations have performed similarly.
AvailabilityGreene Tweed provides all components of the AFB assembly together with the metallic housing. Three stan-dard sizes, listed in the following tables, are available in stock with typical delivery in 1 week. Custom shaft sizes up to 3 in. (8 cm) can be accommodated, but may require a longer lead time. Please contact a Greene Tweed representative for more information.
