Page 176 - Compression Machinery for Oil and Gas

164 SECTION II Types of Equipment

In many respects, the design of an IGC has many similarities with other
turbo-compressor designs. This chapter discussed several areas of the design
process and highlighted some aspects unique to IGCs. For example, bearing
design has to consider gear loads and multiple operating conditions, and rotor-
dynamics analysis can be more complicated, especially if there significant cou-
pling between the bull gear and pinions. Also, the casing design of an IGC is
particularly unique and has different loading requirements (e.g., piping loads
and overhung weight) and assembly tolerance mitigation schemes than found
on other compressor types.
Finally, the applications of IGCs were discussed. Beginning with plant air
service since before the 1950s, IGC applications have expanded into the process
industry and are used in air separation, midstream production with LNG, power
generation, etc. Due to the advantages of IGCs, their applications continue to
increase.

References
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[3] K. Wygant, J. Bygrave, W. Bosen, R. Pelton, in: Tutorial on the application and design of inte-
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[6] ASME n.d. Boiler and Pressure Vessel Code, American Society of Mechanical Engineers.
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[8] API 613 n.d., “Special Purpose Gear Units for Petroleum, Chemical, and Gas Industry
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[9] ISO 6336 n.d., “Calculation of Load Capacity of Spur and Helical Gears,” International
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[11] API 684 n.d., “Paragraphs Rotodynamic Tutorial: Lateral Critical Speeds, Unbalance
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[13] D.W. Dudley, Handbook of Practical Gear Design, McGraw-Hill, New York, 1984.