Industrial equipment is the heart of any production, and properly selected lubricants guarantee its uninterrupted operation. From conveyor belts to CNC machines, every part requires a specific lubricant that reduces friction, prevents wear and protects against corrosion. But how do you sort through hundreds of brands and types of oils when performance and safety are at stake?
In this article we will look at classification of industrial oils, their key characteristics and selection criteria for different types of equipment. You will find out what hydraulic oils different from compressorwhy do they use it in the food industry? H1-certified lubricants, and how to avoid common mistakes when changing the oil. And for clarity, there are comparative tables, checklists and answers to frequently asked questions from practicing engineers.
1. Classification of industrial lubricating oils: main types
All lubricants used in production are divided into groups according to purpose, composition and operating conditions. International standards (eg ISO 6743 or DIN 51502) help to unify labeling, but manufacturers often use their own designations. Let's look at the key categories:
- 🔧 General purpose industrial oils — for bearings, gearboxes, open gears. Examples: ISO VG 68, 100, 150.
- 💧 Hydraulic oils — for systems with high pressure (presses, machines). Marked as HL, HM, HV by DIN 51524.
- ⚙️ Gear (transmission) oils - for gear transmissions. Classification by AGMA or GL-4/GL-5.
- 🌀 Compressor oils — for air and gas compressors. Divided into oils for piston and screw compressors.
- 🍗 Food grade lubricants - certified according to NSF H1/H2 for equipment in contact with products.
- ⚡ Electrical insulating oils — for transformers and high-voltage equipment.
Important: metalworking oils (e.g. Coolant - cutting fluids) are often confused with industrial lubricants, but this is a separate category that requires special disposal.
2. Criteria for choosing oil for industrial equipment
An error in choosing a lubricant can lead to overheating of components, accelerated wear or even emergency stop of production. To avoid this, consider:
- 📏 Viscosity (index by ISO VG): determines the ability of the oil to maintain a protective film at different temperatures. For example, ISO VG 46 suitable for medium loads and VG 680 - for difficult conditions.
- 🌡️ Temperature range: oils with additives (HM) can withstand up to +120°C, and synthetic (PAO) - up to +150°C.
- 🔄 Service life: some oils require replacement every 2,000 hours, others (long-life) - once every 10,000 hours.
- 🛡️ Protective properties: extreme pressure (EP), anti-corrosion or anti-foam additives.
Warning: ⚠️ Attention — never mix oils of different types (for example, mineral with synthetic) without preliminary compatibility tests. This can cause sediment to form and clog the filters.
| Equipment type | Recommended oil | Key Additives | Replacement period (motor hours) |
|---|---|---|---|
| CNC machines (spindles) | ISO VG 32-68 (HM) | Anti-scuff, anti-oxidation | 4 000–6 000 |
| Screw compressors | DIN 51506 VDL | Anti-foam, heat-stable | 8 000 |
| Food equipment | NSF H1 (e.g. Klüberfood NH1 4-460) | Harmless to health | 2 000–3 000 |
| Hydraulic presses | HVLP (eg. Shell Tellus S4 VX) | Anti-wear, low temperature | 5 000–10 000 |
Before adding new oil, always check its compatibility with equipment sealing materials (e.g. NBR or Viton). Some synthetic oils can attack rubber gaskets.
3. Features of oils for the food and pharmaceutical industries
In industries where equipment comes into contact with food or medicine, specialized lubricants with certification NSF (USA) or ISO 21469. They are divided into three categories:
- 🍎 NSF H1 — accidental contact with the product is allowed (up to 10 mg/kg). Example: Mobil SHC Cibus Series.
- 🚫 NSF H2 — does not allow contact with the product, is used in closed systems.
- 💊 NSF 3H - for equipment that comes into contact with products during the production process (for example, molds for chocolate).
The key difference between these oils is no toxic additives (e.g. zinc or sulfur) and high resistance to water or steam washing. However, their cost is 2–3 times higher than standard industrial oils.
⚠️ Attention: When using H1-oils Be sure to keep a lubrication log indicating the date, oil type and volume. In the event of an audit (for example, HACCP) this will help confirm compliance with regulations.
What happens if you use regular oil in food production?
If uncertified oil comes into contact with the product, it may cause poisoning, allergic reactions or damage to the batch. In addition, this threatens fines from Rospotrebnadzor (up to 500 thousand rubles for legal entities) and product recall.
4. Synthetic vs mineral oils: what to choose?
The main difference is basic foundation:
- ♻️ Mineral oils - cheap, but quickly oxidize and require frequent replacement. Suitable for light loads (eg. ISO VG 32 for fans).
- 🧪 Synthetic oils (PAO, PAG, esters) - more expensive, but stable at extreme temperatures. Used in high speed bearings or vacuum pumps.
- ⚗️ Semi-synthetics - compromise on price and properties. Popular in hydraulic systems (HM oils).
Example: in screw compressors synthetic oils (PAG) reduce energy consumption by 5–7% due to less friction, but they cannot be used in older models with copper parts - they cause corrosion.
Check seal compatibility | Flush the system with a special solution (e.g. Flushing Oil)|Fill with synthetic to 50% and observe 100 hours|Completely change the oil and filters-->
5. Common mistakes when using lubricating oils
Even experienced engineers sometimes make mistakes that shorten the life of the equipment. Here are the most common:
- Ignoring manufacturer's recommendations. For example, fill ISO VG 100 instead of VG 150 into the gearbox will lead to its overheating.
- Neglecting oil analysis. Laboratory test (Ferrography, IR spectroscopy) can reveal metal particles or oxidation long before failure.
- Storing oils in improper conditions. Open barrels in a warehouse without climate control accumulate moisture and dust.
- Saving on filters. A cheap filter allows particles >10 microns in size to pass through, which accelerates bearing wear.
According to statistics SKF54% of bearing failures are due to improper lubrication rather than mechanical stress.
Regular monitoring of oil condition (visually or using sensors) can prevent 70% of equipment emergency stops.
6. How to properly store and dispose of industrial oils
The shelf life of oils in closed containers is from 3 to 5 years, but after opening it is reduced to 1–2 years. Basic rules:
- 🏭 Store barrels in a vertical position in a dry room at a temperature of +5...+30°C.
- 🚯 Use special oil collectors for used oils - they must not be poured down the drain!
- ♻️ Disposal is carried out by licensed companies (for example, EcoOil or RusOil). The fine for non-compliance is up to 250 thousand rubles. (Article 8.2 of the Code of Administrative Offenses of the Russian Federation).
Tip: for convenience, use color coding barrels (for example, red - hydraulic oil, blue - compressor oil). This will reduce the risk of mixing up oils when refueling.
7. Innovations in industrial lubricants: what awaits the industry?
Manufacturers are actively developing biodegradable oils (based on rapeseed or soybean oil) and "smart" lubricants with nanoparticles that restore microdamage to metal. For example:
- 🌱 Castrol Bio-Syn XTC — biodegradable hydraulic oil for environmentally sensitive industries.
- 🤖 Shell Omala S5 Wind — oil with nanoadditives for wind generators, reducing wear by 40%.
Also gaining popularity central lubrication systems with IoT sensors that monitor oil viscosity and contamination levels in real time.
FAQ: Frequently asked questions about industrial oils
Can automotive motor oil be used in industrial equipment?
No, it is absolutely not recommended. Automotive oils (SAE 10W-40) contain additives that are not intended for long-term operation under high loads. For example, they do not contain anti-foam additives, which are critical for hydraulic systems.
How often do you need to change the oil in a screw compressor?
The service life depends on the type of oil and operating conditions:
- Mineral oil: every 2,000–4,000 hours.
- Synthetic (PAO): 6,000–8,000 hours.
When working in dusty workshops, the interval is reduced by 30%.
What are the differences between oils? HL and HM for hydraulics?
HL (Hydraulic Oil L) - basic protection against corrosion and oxidation. HM (Hydraulic Oil M) contains anti-wear additives (for example, ZDDP) and is suitable for high pressure systems (>200 bar).
Do I need to flush the system when changing oil type?
Yes, if you switch from mineral to synthetic or change the viscosity by more than 2 grades (e.g. from VG 68 to VG 150). For washing, use special compounds (Flushing Oil) or oil of the same brand, but with reduced viscosity.
Which oil is suitable for high vacuum pumps?
Vacuum systems require oils with low vapor pressure (for example, Fomblin Y-VAC based on perfluoropolyethers). They do not evaporate in a vacuum and do not pollute the chamber.