Objective: verify the hydrocracked mineral air compressor oil CPI-9370-46 under air-compressor conditions in Vietnam (hot discharge, dusty and humid compressor rooms) and use oil analysis to set the change interval for each machine. Six machines at three plants were monitored; this article presents three representative machines. Result: the normal samples held a viscosity of 44–50 mm²/s, within ISO VG 46, and a TAN below 0.5 mg KOH/g up to almost 5,000 hours; the 75 kW machine went on to 7,612 hours on one fill when monitoring ended (last analyzed sample at 4,872 hours); one case of water entering the oil was detected early through routine sampling and dealt with.
Binh Duong (now Ho Chi Minh City), North Central Vietnam, Dong Nai · Aug 2022 – Jul 2023
Objective: fill the ammonia refrigeration compressor oil CPI-1009-68 into four NH₃ screw compressors with 11,400–49,100 running hours without letting old oil and sludge contaminate the new oil. Method: drain the compressor unit and the separator through the machine's oil drain valve, clean the filter, drain every low point until the oil runs clear, and only then pump in the new oil; done during a maintenance stop, without dismantling the machines.
Dong Thap · Oct 2016
Objective: in a station with several machines, choose the oil by each machine's conditions and the base oil in it, and change the oil without carrying old deposits into the new oil. The 132 kW machine runs hot (display reading about 96 °C at the survey) and was on another manufacturer's PAG-based oil; it was switched to CPI-1522-46, a PAG/ester oil of the same family. The 200 kW machine runs cooler and was given the PAO oil CPI-4601-46. Both were drained completely, the separator tanks cleaned and the separator elements and filters replaced before filling; Hop Tien recommends an analysis sample after 500 hours.
Dong Nai · Nov 2018 – Aug 2019
Objective: clean the varnish out of a 75 kW screw air compressor with many years of service and switch it to an NSF H1 registered air compressor oil without a long shutdown. Method: run the cleaning oil CPI COMP CLEAN II (not an H1 oil) in production for up to 500 hours per TDS so the varnish dissolves gradually; drain completely, clean the system and replace the filters as recommended; only then fill the H1 oil CPI-4265-46F and monitor by periodic oil analysis according to the plant's maintenance schedule.
Binh Duong (now Ho Chi Minh City) · Mar 2019
Objective: clean the carbon deposits from the chain and guide rails of an 8-chamber stenter before switching to LUBCON TURMOFLUID 40 B chain oil, with a procedure that can be repeated on the other machines: mechanical cleaning, spraying the cleaning oil LUBCON TURMOWOODOIL MKP Cleaner at the chain's working temperature in several rounds, blowing with compressed air, then changing the oil. Results assessed visually (before/after photos) and by the maintenance team's observations.
Dong Nai · 2017
Objective: get data from real machines before changing grease: how long LUBCON grease stays on the draw-frame rollers compared with the grease in use, and which grease suits the spindle bearings of the ring frames (spindle speed about 19,500 rpm) and the open gears. Result: on the draw-frame rollers the LUBCON grease was still in place after at least 18 days (when the trial was stopped), compared with about 9 days for the grease in use; the open gears and the ring-frame spindle bearings were stable after two weeks by observation.
Mekong Delta · Jun 2017Figures come from on-site records and oil-analysis reports; results depend on each machine's operating conditions and are not a guarantee for every case.
Hop Tien runs a measured trial on one machine first, then proposes the full changeover.
