In a pharma plant the production lines get the attention, but the utilities keep the plant in compliance. Air handling units hold clean-room pressure, temperature and humidity. Chillers and cooling towers hold process temperatures. Compressors supply process and instrument air, and pumps move purified water and utilities around the site. When an AHU fan bearing fails, the result can be a stopped batch and a deviation report, not just a repair.
Grease AHU fan and pump motor bearings with a long-life polyurea grease, in the right quantity, at the interval on the motor or bearing plate. Keep AHU and cooling-tower belt drives tensioned and aligned. Use only the oil the chiller or compressor maker specifies, and record every lubrication task in the plant's maintenance log. Points where lubricant could reach product follow the plant's food-grade (H1) rules.
| Equipment | Lubrication point | What to use | Typical check |
|---|---|---|---|
| AHU supply and return fans | Fan and motor bearings | Polyurea grease, NLGI 2, or as specified | Grease at the plate interval; vibration and temperature monthly |
| AHU fans | Belt drive | Wedge belts (SPZ, SPA) as fitted | Tension and alignment at every PM |
| Chillers | Refrigeration compressor | Only the refrigeration oil the chiller maker specifies | Oil level and maker's tests |
| Lubricated air compressors | Crankcase or sump | Compressor oil of the maker's grade | Drain condensate daily |
| Oil-free compressors | Gearbox and bearings | The maker's specified oil | Oil level at PM |
| Purified water and utility pumps | Motor and pump bearings | Polyurea grease or as specified | Temperature and noise |
| Cooling tower fans | Right-angle gearbox | EP gear oil of the maker's grade | Level and water in oil, monthly |
AHU fans run continuously, often for years, and their bearings fail for a few repeat reasons:
Polyurea grease is the usual choice for electric motor and fan bearings: it runs quietly, lasts long and stays stable at higher speeds and temperatures.
A slipping belt means lower fan speed and less airflow, which can show up as a pressure or air-change problem in the clean room before anyone hears a squeal. Check tension and alignment at every preventive-maintenance visit, replace all belts on a multi-belt drive together, and keep a spare set for each AHU. Wedge belts carry more power in narrower pulleys, and Beltone wedge belts are static conductive, which helps where dust and static matter.
A chiller compressor's oil is matched to its refrigerant. Topping up with a general compressor oil can damage the compressor and contaminate the refrigerant circuit. Use only the oil the chiller maker specifies, and leave chiller oil work to trained technicians.
Product-contact and clean-room air usually comes from oil-free compressors or from lubricated compressors with proper filtration, as your plant's air quality specification requires. For lubricated reciprocating compressors in utilities, use the compressor oil grade the maker specifies and drain condensate from receivers daily. Our guide to screw vs reciprocating compressor oil explains the differences.
Cooling tower fans often run through a right-angle gearbox in a wet, misty place. Check the oil level and look for a milky colour, which means water in the oil. Use the EP gear oil grade the gearbox maker specifies.
Auditors expect to see that utilities are maintained under control. A simple lubrication register covers it:
Label grease guns and oil cans with the lubricant they hold, and store H1 and standard lubricants separately.
Store lubricants outside clean rooms, take only what a job needs, wipe off excess grease after every task and use dedicated, labelled tools. Most lubrication-related audit findings come from housekeeping, not from the lubricant itself.
For lubricants on the production side, including tablet presses and packing lines, see our page on pharmaceutical industry lubricants.
Which grease is used in AHU fan bearings?Usually a polyurea grease of NLGI 2, or the grease the fan or bearing maker specifies, applied in the right quantity at the plate interval.
How often should AHU belts be checked?At every preventive-maintenance visit: tension by measurement, alignment and wear. Replace all belts on a drive together.
Can any compressor oil be used in a chiller?No. Chiller compressor oil is matched to the refrigerant. Use only the oil the chiller maker specifies.
What should a lubrication register contain?The equipment and point, the lubricant and grade, the quantity and interval, and the date, person and observation for each task.
Maintaining utilities at a pharma plant? Send us your AHU, compressor, pump and cooling-tower list, and our team will prepare a lubrication schedule you can put straight into your maintenance log.