Case Studies - MagnaDrive Coupling Air Preheater

Minnesota Power Upgrade to MagnaDrive Magnetic Couplings on Air Pre-Heaters

 

1.0 Problem

Minnesota Power was experiencing vibration problems on their Air Pre-Heaters. In an effort to correct this problem, Minnesota Power implemented a preventative maintenance procedure that required all couplings to be re-greased during every outage.

Each re-greasing would tie up 3 Maintenance Technicians for 3 days. Worse yet, the reduction in vibration levels that was accomplished by the regreasing would only last a couple of weeks before the vibration would return.

2.0 Solution

MagnaDrive approached Minnesota Power with a proposal to replace the existing couplings with MagnaDrive Magnetic Couplings.

3.0 Result

Minnesota Power’s vibration problems on their Air Pre-Heaters have been completely eliminated. Estimated savings based on quarterly outages and 9 mandays per outage is:

 

4 outages X 9 man-days/outage X $600 /man-day = $21,600 annually!

 

Supporting Data:

 

Minnesota Power Cohassett, MN

• Vertical Market: Power Generation
• Application Type: Equipment/Machinery
• Product: Magnetic Coupling, Total of 4 in use
• Load Type: Air Preheater
• Motor Characteristics: 40 hp 1800 rpm

MagnaDrive Advanatages:

• Thermal Shaft Expansion
• Vibration Isolation
• Reduced Maintenance