Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION Pour Point Pour point is the lowest temperature at which the oil will just barely flow. It becomes very important in cold weather starting applications and in cylinder and packing lubrication with very cold suction temperatures. Flash Point Flash point is the lowest temperature at which the oil will vaporize to create a combustible mixture in air. If exposed to flame, the mixture will flash into flame and then extinguish itself. This is important in high temperature applications when the oil may come in contact with air. Lubricant Base Stock Liquid lubricants commonly used in compressors include petroleum based oils and synthetic fluids. All lubricant formulations start with base stock and lubricant additives are used to improve specific properties such as: • Increase the viscosity index • Inhibit oxidation • Depress the lubricant pour point • Inhibit rust formation • Improve detergency • Provide anti-wear protection • Provide extreme pressure protection • Alter the friction characteristics • Decrease the effects of gas dilution to resist "washing" of the lubricant due to water, wet or saturated gas, or dilutent properties of the gas stream. Petroleum-Based Lubricants (also referred to as mineral oils) Paraffinic Oils • Solvent refined or hydro-treated • West Texas Intermediate or Arab Light • Higher wax content • Viscosity Index, greater than 90 • Pour point around 25°F (-4°C) • This is the most common mineral oil base stock. Napthenic Oils • Solvent refined or hydro-treated • South Louisiana crude • Lower Wax content • Viscosity Index, less than 80 7/09 PAGE 4 - 3
FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION • Lower pour point than paraffinic oils • Better additive solvency Synthetic Lubricants Synthetic lubricants are man-made materials with more consistent, controlled chemical structures than petroleum lubricants. This improves predictability of viscosity and thermal stability that results in much higher viscosity indexes than mineral oils. Additives can be used to modify all the common lubrication characteristics to meet or exceed the performance of mineral oils. There are three major types of synthetic fluids used for lubrication. They are commonly referred to as PAO, Diester, and PAG. NOTE: MOST SYNTHETIC LUBRICANTS WITH THE PROPER VISCOSITY ARE ACCEPT- ABLE FOR USE IN THE COMPRESSOR FRAME. CHECK WITH YOUR LUBRI- CANT SUPPLIER OR ARIEL BEFORE USING ANY LUBRICANT, IF YOU HAVE ANY QUESTIONS ABOUT THE APPLICABILITY OF THE LUBRICANT IN THE FRAME. Polyalphaolefins (PAO) - Synthesized Hydrocarbons • Compatible with mineral oils • Most of the same properties as mineral oils • Requires additives to improve detergent action and improve seal compatibility • Soluble in hydrocarbon gases • High viscosity index, approximately 150 • Low pour point • High flash point Organic Esters - Diesters and Polyolesters • Compatible with mineral oils, PAO and PAG oils • Incompatible with some rubbers (O-rings), plastics, and paints; compatible with Viton • Primarily used in air compressors • Leaves a soft carbon deposit when oxidized • Breaks down in water • Higher flash point than mineral oils • Can be made only to a viscosity of approximately (85-90 cSt at 40°C) • Higher viscosity achieved with additives or blending with heavier oils • Low viscosity index, approximately 70 Polyalkylene Glycols (PAG) • Very good lubricant for high pressure applications • Does not foul reservoirs. Excellent for any reinjection application • Resistant to hydrocarbon gas dilution • Most are water soluble, verify application with lubricant supplier PAGE 4 - 4 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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