**Guidelines for Selection and Maintenance of Special Oil for Roots Blowers**
The lubricating oil (or grease) of Roots blower is the key to ensuring long-term stable operation of the equipment, and it needs to be strictly selected according to the fan type (gearbox, bearings), operating conditions (temperature, load) and manufacturer requirements. Here is a professional oil selection guide:
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**1、 Lubrication parts and oil types of Roots blower**
|* * Lubrication parts * * | * * Lubrication method * * | * * Recommended oil type * * | * * Function * *|
|----------------|-------------------|--------------------------------|-----------------------------|
|* * Gearbox * * | Splash/cycle lubrication | ISO VG220/VG320 synthetic gear oil | Reduce gear wear and heat dissipation|
|* * Bearings * * | Lubricating grease (common) | Lithium based grease (NLGI grade 2) | Rust prevention, noise reduction, and extended bearing life|
|* * High speed bearings * * | Forced oil lubrication | Turbine oil (ISO VG68) | High temperature and shear resistance|
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**2、 Core performance requirements for specialized lubricants**
1. * * Base oil type**
-Mineral oil: economical type, suitable for light load at room temperature (such as operation at 40 ℃).
-* * Synthetic oil * * (PAO/esters): resistant to high and low temperatures (-20 ℃~120 ℃), strong antioxidant properties, recommended for high pressure/high temperature conditions.
2. * * Viscosity Selection * * (ISO VG Standard)
-Gearbox: VG220 (normal temperature), VG320 (high temperature or heavy load).
-Bearing oil lubrication: VG68~VG100 (adjusted according to speed).
3. * * Additive formula**
-Extreme pressure anti-wear agent (such as ZDDP): protects gears from wear under high loads.
-Antioxidants: Extend oil change intervals (synthetic oil can last up to 8000 hours).
-Rust and anti-corrosion agents: Suitable for humid or corrosive environments.
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**3、 Recommended well-known brands**
|* * Brand * * | * * Recommended Products * * | * * Applicable Scenarios * *|
|--------------|-------------------------|-----------------------------|
|* * Mobil * * | Mobilgear 600 XP Series | High Pressure Gearbox (Extreme Pressure Resistant)|
|* * Shell * * | Omala 320 | High temperature industrial gearbox|
|* * Kl ü ber * * | Kl ü bersynth GH 6-220 | Food grade synthetic gear oil (NSF H1 certified)|
|* * Great Wall * * | L-CKD 220 heavy-duty gear oil | Domestic economical alternative solution|
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**4、 Key points for selecting lubricating grease**
1. * * Consistency grade * *: NLGI grade 2 (universal type), NLGI grade 1 (low temperature environment).
2. Temperature resistance:
-High temperature type: Drop point ≥ 200 ℃ (such as composite lithium grease).
-Low temperature type: can still be pumped at -30 ℃ (such as silicone grease).
3. * * Special Needs * *:
-* * Food grade * *: NSF H1 certification (such as Kl ü bersynth Food 46).
-Anti water erosion: Polyurea based grease (for wet conditions).
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**5、 Oil Change and Maintenance Standards**
1. Oil change cycle**
-Gearbox oil:
-Mineral oil: 3000-4000 hours or annually.
-Synthetic oil: 6000-8000 hours or every 2 years.
-Lubricating grease: replenished every 2000-3000 hours and replaced annually.
2. * * Oil change steps**
-After shutdown, drain the oil while it is still hot (old oil should be drained).
-Clean the fuel tank (rinse with new oil of the same model).
-Add oil to the center line of the fuel gauge (excessive amount can cause heating).
3. Oil testing**
-* * Routine monitoring * *: Check the oil level and color monthly (replace if it turns black or emulsified).
-* * Professional testing * *: Sampling and testing viscosity, moisture, and metal particle content annually.
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**6、 Common problem handling**
|* * Problem * * | * * Reason * * | * * Solution * *|
|-------------------|------------------------|-------------------------------|
|* * High oil temperature * * | Improper oil viscosity/insufficient oil volume | Replace with high viscosity oil or check the cooling system|
|Oil emulsion | Moisture intrusion (high humidity) | Change the oil and check the sealing|
|* * High gear noise * * | Oil film rupture/insufficient extreme pressure | Replace with synthetic oil containing extreme pressure additives|
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**7、 Precautions**
-* * Prohibition of mixing oil products * *: Mixing different brands/types of lubricants may cause sedimentation.
-Storage conditions: The oil drum should be sealed and stored in a cool place to avoid water ingress and oxidation.
-Environmental requirements: Waste oil should be treated as hazardous waste and should not be discharged indiscriminately.
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**Summary**
The selection of specialized oil for Roots blowers should follow the principle of "suitable temperature, suitable speed, and suitable load":
-Gearbox: High viscosity extreme pressure gear oil (VG220/VG320).
-* * Bearing * *: Long lasting lithium grease (NLGI grade 2).
-* * Harsh environment * *: Synthetic oil is preferred.
**Maintenance mnemonic * *:
-Regularly check for oil shortage prevention, replace according to standards, and do not compromise.
-* * High temperature heavy-duty selective synthesis * *, * * Food and pharmaceutical certification * *.
It is recommended to keep the lubricant specifications in the equipment manual and consult the manufacturer or oil supplier for professional matching if necessary.
