tailieunhanh - Machinery Components Maintenance And Repair Episode 2 Part 8

Tham khảo tài liệu 'machinery components maintenance and repair episode 2 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 490 Machinery Component Maintenance and Repair Figure 8-27. Another classical problem is erosion of steam turbine casings in the grooves that retain the diaphragms. These can be restored to original dimensions using a combination of welding and mechanical techniques. Figure 8-28. Turbine diaphragm for the casing shown in Figure 8-27. Steam erosion which is very evident on the outer diameter is repaired by welding. Nozzles can also be repaired although these are in good condition. Repair and Maintenance of Rotating Equipment Components 491 Will a Repairer Manufacture Spare Parts The supply of spare parts is a specialized function requiring the knowhow of the original equipment manufacturer OEM . Another OEM can indeed reconstruct spare parts manufactured by others. However he has to spend engineering hours to create a drawing and to specify the processes and quality controls. This means that it is often more economical to buy parts from the original manufacturer. An expert repairer who is also an OEM has the capability of designing and manufacturing a spare part required to complete a repair and will do so if needed. One should be wary of any repairer offering only spare parts since these will often not meet the original specifications and quality controls. Proof of Repairability An expert repairer keeps careful records of his activities. One of the quality records maintained is a job folder for each repair containing all the information pertaining to that repair. This includes dimensional checks nondestructive examination specifications in-progress quality records and a detailed list of the work carried out. Another set of records contains certified repair procedures carried out on certain classes of parts. This in effect is a repair manual containing all the necessary procedures specifications and quality checks to carry out a repair. This is also a record of repairs actually carried out proved and documented. By repeating the exact same process on a similar part