The remaining end of the motor drives a three-stage integral gear compressor (12,553, 17,934 and 25,174 rpm) via a gear flex coupling. The NAP2 PAC consist of a 50 Hz 4-pole, sleeved bearing supported, 2.6 MW electric motor driving from one end a step-up gearbox, which is coupled to a hot gas expander, fitted with tilting pad bearings, via a gear type coupling. The NAP2 PAC (Primary Air Compressor) is one of two critical compressor trains within Nitric Acid Plant No.2 and is equipped with an online vibration monitoring & protection system with online diagnostic software. The clients site consists of 3 nitric acid plants along with one ammonia plant for the manufacture of various explosive products, primarily supplied to the Australian mining industry. Thereafter, pertinent recommendations in relation to corrective maintenance actions were provided to both the end user and the OEM which assisted their mechanical investigations. This case highlights how a suitably instrumented compressor train connected to a diagnostic platform (S1 Evo) provided critical information (data) to the Bently Nevada diagnostic engineers, enabling a thorough into investigation into the vibration related issue, as well as determining the root cause. This case describes how the remote diagnostic team resolved a vibration related issue on the NAP2 PAC Primary Air Compressor.
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