When failed equipment is sent to the equipment repair shop, the first step is disassembly and inspection. At this point, the shop knows the basic design and failure information about all equipment. Once a repair has been approved and performed by the shop, the shop also knows the cost of repair and warranty period.

Design Information:
Design information on equipments needed by the plant goes beyond just the nameplate data. Information such as a bearing currently installed, number of bars and slots, insulation class, and full load current is extremely helpful for plant condition analysis and testing, purchasing, and routine maintenance.



Root Cause of Failure:
Typically the plant will see the equipment's failure as why it stopped functioning, such as "winding failure" or "bearing failure." This level of information is not helpful in assisting the plant in understanding how to make the equipment live longer. The shop can usually determine the root cause of failure such as:

• Over greasing
• Dirty cooling passages
• Overload
• Power quality
• Inadequate lubrication
• Lighting strike
• Internal moisture
• Excessive starts
• Wrong lubricant

Once the plant knows root causes of failures, action can be taken to eliminate the root cause and obtain longer equipment life.

Date Received and Shipped:
These dates will allow the calculation of Mean Time to Repair and Mean Time Between Repairs.

Cost of Repair:
Upon disassembly and inspection, the plant may decide to overhaul the equipment or to scrap it and purchase new equipment. In either case, the cost of the failure needs to be stored with the failure information.

Warranty:
Equipment warranty is a special consideration of equipment management. Overhauled equipment often has a 1 or 2 year warranty and new equipment has a 1 to 5 year warranty. Many plants do not pursue warranty claims because the system required to easily warn them of a potential warranty claim does not exist. Often the savings obtained from warranty tracking will more than pay for the complete equipment management package.

Asset Group Analysis:
Tango™ provides reports on Asset Group Reliability measurements such as MTBF, root causes of failure, and cost of failure. Tango™ assists you in understanding how reliable your plant"s assets are and whether reliability improvement programs are working.