Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION Thermostatic control valve (3) configuration may vary from this schematic, depending on valve size. In mixing mode, B connection is lube oil from main oil pump with tee connection to lube oil cooler inlet, C is from lube oil cooler outlet and A is to main oil filter. Valve connections A-B-C are marked on the valve. Packager Connection to Compressor Driven Oil Pump 1 2 8 Install Check Valve (8) if over 3 Ft. (0.9 m) vertical run to Oil Sump (9) Frame Oil Operating Conditions Compressor Frame Lubricant 9 A7 A1 A3 A4 A8 Oil Connections (See Ariel Outline Drawing for Details) A1 Packager Connection from Compressor Driven Oil Pump A2 Packager Connection to Oil Filter A3 Packager Connection - Oil from Compressor Crankcase A4 Lube Oil Compressor-Inlet-Connection to Gallery Tube. Oil Flows to the Crankshaft Main Bearings and through Drilled holes in the Crankshaft to Connecting Rod Bearings A5 Pressure Regulating Valve Return Connection to Crankcase, when applicable on some models A6 Filter Vent Return Connection to the Crankcase, when applicable on some models A7 Oil Tubing Connections from Frame Gallery Tube to Top & Bottom of the Crosshead Guides to Lubricate Crossheads A8 Compressor Crankcase Oil Drain A5 A6 Typical Dry Sump Design (“Dry” Crankcase) 4 8 Ariel recommends for use in the compressor frame, an ISO 150 grade paraffinic mineral oil that provides oxidation inhibition, rust and corrosion inhibition, and anti-wear properties. This is commonly called R&O oil. SAE 40 wt engine oil is also acceptable in the frame, but contains significant amounts of additives that are not necessary in a compressor. 7/09 PAGE 4 - 13 7 B A C 3 6 A2 A3 - From drive end of frame. 8 F 5 Piping and components by Ariel Piping and components by Packager System Components 1. Y - Strainer - Required (supplied unmounted by Ariel) 2. Compressor Driven Oil Pump (w/ Safety Relief Valve - used as a pressure regulating valve, or for some models when a separate regulating valve (6) is provided, as a relief valve) 3. Thermostatic Control Valve, 170°F (77°C) nominal rating - Required (available as an option from Ariel) 4. Pre-Lube Oil Pump - Required (with oil heating circuit when applicable) 5. Oil Filter 6. Pressure Regulating Valve (w/ Overflow Return to Crankcase), when applicable for some models 7. Oil Cooler - Required 8. Check Valve 9. Separate Lube Oil Reservoir (Oil Sump) - Required FIGURE 4-4 OPTIONAL DRY-SUMP FRAME LUBE OIL SCHEMATIC - TYPICAL
FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION In limited circumstances and with prior approval from Ariel, cold weather installations may use multi-viscosity oils in the compressor frame if the oil supplier can certify that the oil is shear stable. The viscosity of shear stable oil degrades less through use. Most oil suppliers will certify their oil as shear stable if the viscosity degrades less than a certain percentage in specific tests. As a result, multi-viscosity oils are subject to a shorter oil life than single straight grade oils by 30% to 50%. Synthetics such as PAG, PAO, or ester based lubricants are acceptable in the compressor frame provided they meet the operating viscosity requirements as outlined below. Compounded lubricants are prohibited in the frame. Oil Viscosity The minimum allowable viscosity of the oil going into the frame is 82.6 SUS (16 cSt). Typically this is the viscosity of ISO 150 grade oil at about 190°F (88°C). The maximum viscosity of the lube oil for cold ambient temperature starting is 15,000 SUS (3300 cSt). Typically this is the viscosity of ISO 150 grade oil at about 25°F (-4°C). Oil Pressure Normal pressure on the discharge side of the lube oil filter is factory set for 60 psig (4.1 bar g ) for compressors that were tested mechanically complete (has inspector tag). If tested at factory as mechanically incomplete (without inspector tag), normal oil pressure must be set by packager or at initial start-up to 60 psig (4.1 bar g ) at the lower of the Frame Rated Speed, cylinder (RPM) or driver speed, and at normal operating temperature. If the lube oil pressure drops below 50 psig (3.4 bar g ), the cause should be found and corrected. A low lube oil pressure shutdown, set at 35 psig (2.4 bar g ), is required for protection of the compressor during a sudden loss of oil pressure. The compressor should not operate for prolonged periods of time at less than 50 psig (3.4 bar g ) oil pressure. For proper operation of the thermostatic control valve, the maximum differential pressure between the hot oil supply line and the cooled oil return line is 10 psid (0.7 bar d ). Oil Temperature The minimum lube oil operating temperature is 150°F (66°C). This is the minimum temperature required to drive off water vapor. Maximum allowable oil temperature into the compressor frame is 190°F (88°C). A thermostatic control valve supplied by Ariel is set at 170°F (77°C). The oil temperature should be maintained as close to this temperature as possible. Higher temperatures increase the oxidation rate of the oil. For every 18°F (10°C) over 150°F (66°C), the oxidation rate of the oil doubles. Oil Maintenance Compressor frame lubricating oil should be changed as indicated in the regular maintenance intervals or with a filter change or when oil analysis results indicate the need. A more frequent oil change interval may be required if operating in an extremely dirty environment without sampling and analysis or if the oil supplier recommends it. PAGE 4 - 14 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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