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Handbook Of Shaft Alignment Episode 2 Part 8

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Tham khảo tài liệu 'handbook of shaft alignment 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 | 480 Shaft Alignment Handbook Third Edition FIGURE 16.4 Compressor case. FIGURE 16.5 Thermal image of compressor case. Measuring and Compensating for Off-Line 481 FIGURE 16.6 Axial flow compressors. instruments scan the object for the infrared radiation and amplify the converted electrical signals from a supercooled photodetector onto a cathode ray tube CRT where a photographic image of the object can be recorded. Figure 16.4 shows a three-stage centrifugal compressor case and Figure 16.5 illustrates the temperature profile when the compressor is running under full load. The white areas show where the infrared radiation heat is the greatest. The hottest areas in the image are approximately 135 F. Figure 16.6 shows an axial flow compressor with rigid supports at the inlet end and flexible supports at the discharge end. Figure 16.7 illustrates the thermal profile of the discharge end with the compressor running under load note the hot spot at the one o clock position . Figure 16.8 shows a closer view of the flexible support leg. The lifting eye is at the left side of the photograph and the flex leg is the black portion just to the right of the lifting eye. The photograph clearly shows that the support leg stays at ambient temperatures and does not expand thermally as originally thought when the machinery was installed . Although movement of rotating machinery casings does not occur solely from temperature changes in the supporting structures and the casings themselves infrared thermographic studies can assist in understanding the nature of the thermal expansion that is taking place. 16.7 INSIDE MICROMETER-TOOLING BALL-ANGLE MEASUREMENT DEVICES Another technique that falls into the category of movement of a machine case centerline with respect to its baseplate is performed using tooling balls as reference points and measuring the distance between the tooling balls with inside micrometers or with an inside micrometer and an inclinometer angle measuring device . 482 .