TAILIEUCHUNG - Machinery Components Maintenance And Repair Episode 2 Part 9

Tham khảo tài liệu 'machinery components maintenance and repair episode 2 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Centrifugal Compressor Rotor Repair 515 Journal surface Surfaces that have been scratched pitted or scraped to depths of in. or less are acceptable for use. Deeper imperfections in the range of to in. must be restored by strapping. Thrust collar does it have good finish Use same guidelines as for journals. Is the locking nut and key tight If the collar is removed is its fit proper It should have to in. interference minimum. 3. The journals coupling fits overspeed trip and other highly polished areas should be tightly wrapped and sealed with protective cloth. 4. The rotor should be sandblasted using No. 5 grade 80 120 mesh polishing compound silica sand or aluminum oxide. 5. When the rotor is clean it should be again visually inspected. 6. Impellers and shaft sleeve rubs rubs in excess of 5 mils deep in labyrinth areas require reclaiming of that area. 7. Wheel location have any wheels shifted out of position Wheel location should be measured from a thrust collar locating shoulder. There should be a 4-5 mil gap between each component of the rotor . each impeller each sleeve etc. 8. On areas suspected of having heat checking or cracks a dye penetrant check should be made using standard techniques or Zyglo a. Preparation Cracks in forgings probably have breathed that is they have opened and closed during heat cycles drawing in moist air that has condensed in the cracks forming oxides and filling cracks with moisture. This prevents penetration by crack detection solutions. To overcome this condition all areas to be tested should be heated by a gas torch to about 250 F and allowed to cool before application of the penetrant. These tests require a smooth surface as any irregularities will trap penetrant and make it difficult to remove thus giving a false indication or obscuring a real defect. b. Application The penetrant is applied to the surface and allowed to seep into cracks for 15 to 20 minutes. The surface is then cleaned and a .

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