Shell Gas Compressor Oil S4 RN 68
Shell Gas Compressor Oil S4 RN 68 is an advanced synthetic lubricant developed specifically for rotary screw compressors operating with natural gas and other hydrocarbon gases. The oil is formulated using polyalkylene glycol (PAG) base fluids combined with advanced additive technology to provide excellent lubrication performance, improved equipment protection and extended service intervals. Its specialised formulation helps ensure efficient and reliable compressor operation in demanding gas compression environments.
One of the key advantages of Shell Gas Compressor Oil S4 RN 68 is its reduced hydrocarbon gas solubility. When conventional mineral oil-based lubricants are used in gas compressors, hydrocarbon gases can dissolve into the oil, causing viscosity loss and reducing lubrication effectiveness. Shell Gas Compressor Oil S4 RN 68 significantly reduces this effect by maintaining viscosity stability when exposed to hydrocarbon gases. This characteristic allows the lubricant to retain a strong lubricating film on compressor components, ensuring effective lubrication of rotors, shafts and bearings.
The oil also provides outstanding wear protection. The stable lubricating film formed by the lubricant helps reduce friction between rotor surfaces and protects critical compressor components from wear and corrosion. In rotary screw compressors, proper sealing between the rotors is essential for maintaining compression efficiency. Shell Gas Compressor Oil S4 RN 68 provides excellent sealing properties at the rotor mesh point, helping maintain compressor efficiency and reliable operation.
Another important benefit of the lubricant is its ability to support extended maintenance intervals. By maintaining viscosity stability and providing excellent lubrication protection, Shell Gas Compressor Oil S4 RN 68 helps reduce the frequency of oil changes and maintenance interventions. This helps lower maintenance costs while improving equipment availability in industrial gas compression systems.
Shell Gas Compressor Oil S4 RN 68 is particularly recommended for use in rotary screw compressors used for low-pressure natural gas compression. It is also suitable for compressors used in LPG bottling operations, where compression pressures may reach up to approximately 40 bar. In addition, the lubricant is suitable for compressors used in LNG and LPG vehicle refuelling systems and for compressors used in marine cargo transport vessels handling a range of hydrocarbon gases.
A further advantage of the oil is its versatility when handling different gas types. When used in marine cargo compressors, the lubricant allows compressors to operate with different hydrocarbon gases without requiring lubricant changes between cargo types. This simplifies operations and improves operational efficiency in gas transport systems.
Physical characteristics include a kinematic viscosity of approximately 78 mm²/s at 40°C and 14.4 mm²/s at 100°C, with a viscosity index greater than 200. The oil has a flash point above 220°C, a pour point of approximately –42°C and a density of around 1050 kg/m³ at 15°C. These characteristics support reliable lubrication performance across a wide range of compressor operating conditions.
