標準號：IS 2974 Pt.3-1975
發布日期：1976/1/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard ( Part III) deals with the design of foundations, such as frame foundations and other similar supported constructions of reinforced concrete for the installation of rotary machines of speed 1 500 rev/min or more ( such as generators, blowers and compressors).1.2 Rotary machines are classified on the basis of their speed as follows:Low frequency Up to 1 500 rev/minMedium frequency 1 500 and up to 3000 rev/minHigh frequency 3 000 rev/min and overwhere N is frequency in revolutions per minute.