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Handbook Of Shaft Alignment Episode 1 Part 5

Tham khảo tài liệu 'handbook of shaft alignment episode 1 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 90 Shaft Alignment Handbook Third Edition It is important for the personnel who maintain rotating machinery to have a basic understanding of how machinery should be supported and what problems to look for in their foundations baseplates and frames to insure long-term alignment stability in their machinery. In addition to the machinery to ground or structure interface attention must also be directed to any physical attachments to the machinery such as piping conduit or ductwork. It is desirable to insure that these attachments produce the minimum amount of force on the machinery to also insure good stability. This chapter will hopefully provide the reader with the basic foundation design principles and some techniques to check equipment in the field to determine if problems exist with the foundation and frame or the interface between the machinery and the foundation or piping and conduit attached to the machine itself. 3.1 VARYING COMPOSITION OF EARTH S SURFACE LAYER The best place to start this discussion is at the bottom of things. All of us realize that there is a major difference in stability as we walk along a sandy beach and then step onto a large rock outcropping. Different soil conditions produce different amounts of firmness. Since rotating machinery could potentially be placed anywhere on the planet the soil conditions at that location need to be examined to determine the stability of the ground. For new installations or where foundations have shifted radically it may be a good idea to have boring tests conducted on soils where rotating machinery foundations will be installed. Table 3.1 shows safe bearing load ranges of typical soils. The recommended maximum soil load from a combination of both static and dynamic forces from the foundation and attached machinery should not exceed 75 of the allowable soil bearing capacity as shown in Table 3.1. 3.2 HOW DO WE HOLD THIS EQUIPMENT IN PLACE I suppose someone has attempted to sit a motor and a pump on the ground