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Tham khảo tài liệu 'handbook of shaft alignment episode 3 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 690 Shaft Alignment Handbook Third Edition FIGURE 21.37 Remove the motor. FIGURE 21.38 Measure the eccentricity at the lower end of the pump shaft. Alignment Considerations for Specific Types of Machinery 691 FIGURE 21.39 Measure the eccentricity at the upper end of the pump shaft. the measurements as shown in Figure 21.41 and Figure 21.42. Ideally the runout should adhere to the guidelines discussed in Chapter 5. 4. Determine if the pump flange face is centered and perpendicular to the pump shaft as shown in Figure 21.43 through Figure 21.45. Since the mating flange faces are often rabbeted fits the rabbet surface is used to check for concentricity and the flange face surface is used for perpendicularity checks. 21.1.6.1 Additional Information on Vertically Mounted Centrifugal Pumps When the motor and pump are bolted together they effectively become one contiguous frame and OL2R machinery movement has very little effect on the alignment of the shafts. Since the entire drive system is typically attached to a floor or the structure of the building checks should be made to insure that the motor-pump assembly is firmly attached to the floor via the anchor bolts. Leakage at the packing gland and frequent replacements of the mechanical seal are indications that a misalignment condition or excessive runout may be the culprit. Excessive vibration can often be attributed to unbalance conditions in the motor armature or pump shafts but can also be traced to excessive runout conditions in the rotating assembly. 692 Shaft Alignment Handbook Third Edition FIGURE 21.40 Eccentricity measurements along the pump shaft and its extension. 21.1.7 Blowers and Fans There are several different designs of fans and blowers and again it would be difficult to cover every aspect of these types of machines. Similar to pumps their purpose is basically to move large volumes of a compressible fluid at low pressures from point A to point B. A large majority of smaller horsepower 5 to 200 hp units
