Each article addresses one specific problem seen in plants, written by Hop Tien application engineers: air compressors, ammonia refrigeration compressors, oven chains, audit documentation, oil analysis reports. Exhibition and company news is in News.
Using another manufacturer's oil or grease? What the engineer checks for each machine group, base-oil tables from the manufacturers' documents and the Hop Tien lines for the same application (reference).
Screw, vane and reciprocating compressors using another manufacturer's mineral or synthetic oil.
Changing between mineral oils for NH₃ and to PAO: pour point, drained oil, seals.
Thickener, base oil viscosity, temperature and relubrication interval.
Six quick-selection pages by machine and operating conditions, with data per TDS and a form to reach an engineer.
Selection by viscosity 32, 46, 68, base oil and operating conditions.
By applicationBy the 120, 160, 200 and 260 °C thresholds; heat-resistant chain oils up to 300 °C.
By applicationBy the n·dm speed factor and base oil viscosity.
By applicationISO VG 150, 220, 320, 460; mineral, PAO, PAG, H1; hydraulic; circulating.
By applicationBy lubrication point in the plant and by the audit file.
By applicationPARATHERM NF, HE and CE by system temperature.
Reference pages for a group of frequent questions.
Which oil an NH₃ system needs; six differences between oils with the same base oil; what an incorrect changeover causes; the procedure: measure first, change correctly, check afterwards.
TopicFour factors behind the differences and a calculator for lubrication cost per 1,000 running hours.
SectionFive checks you can do on a drum; the counterfeit batch numbers in Lubrizol's warning; batch documents (CO, CQ, CoA, SDS, supplementary label); send a label photo for a free check by Hop Tien.
Trials, lubricant changeovers and oil analysis done at plants in Vietnam, with figures and site photos.
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 2019Newest first; each article addresses one specific problem in the plant.
Lubrizol's Aug 2025 warning poster with 8 batch numbers, four kinds of non-genuine stock, why POE oil from the wrong source damages compressors, and how to send label photos for a free check by Hop Tien.
15/Sep 2026TechnicalWhich oil your screw compressor needs is written on the machine itself: the manual, the oil label on the door and the discharge temperature under load. How to read all three and decide when to change the oil.
15/Sep 2026TechnicalTrade names change; base oils do not. How the four base oils in rotary screw compressor oil behave in Vietnamese conditions, why they cannot be mixed, and a table of which switches need a drain and which a full flush.
15/Sep 2026TechnicalRising compressor oil top-up, black oil at the drain points and evaporators that will not hold temperature: the oil's volatility and low-temperature flow are usually behind it.
15/Sep 2026TechnicalViscosity, TAN, water, iron, copper and silicon: what each one says about a screw compressor, with reference limits and three common patterns.
15/Sep 2026TechnicalRapid chain stretch and black carbon on bakery and dryer oven chains are usually caused by the oil and how it is applied, not by the chain. How to check, clean and select.
15/Sep 2026ComplianceThe lubricant records an FSSC 22000 or BRCGS auditor usually asks to see, the nonconformities that cost plants points, and how to file everything so you can answer in minutes.
15/Sep 2026