Heavy Duty Balanced Opposed Compressors - Ariel Corporation

13.11.2012 Views
FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION ratings of Ariel filters. For this reason, Ariel does not recommend after market filters. Exercise caution if an after market filter is installed. Do not use a by-pass type filter. Pressure gauges are provided for monitoring pressure drop across the filter. Differential pressure is the primary indication of a plugged filter. Compressor Prelube Pump An automated compressor pre-lube system is strongly recommended for all Ariel compressors to extend bearing life and reduce operating costs. Compressors that meet any of the following criteria are required to have an automated pre-lube system to provide oil flow prior to start-up: 1. Electric motor driven compressors. 2. Unattended-start compressors, regardless of driver type. 3. All large frame compressor models (JGC, JGD, JGZ, JGU, JGB, JGV, KBB and KBV). Automated compressor pre-lube systems must be designed and sized to provide 10 psig (0.7 bar g ) minimum pressure for a minimum of 30 seconds prior to starting, at the inlet to the oil gallery (after the filter), with minimum start-up oil viscosity and maximum allowable filter differential pressure. It is suggested that the prelube pump be sized at approximately 25% of the frame oil pump capacity. Reference Technical Manual, Section 1, Frame Specification Tables for frame oil pump flow rates, or see the Electronic Databook in the Ariel Performance Program. The purpose is to be sure there is oil flow to all bearings and bushings, and the clearances are filled with oil prior to start-up. A start permissive is desirable to sense for minimum required pressure/time at the inlet to the oil gallery. Automated systems are to provide for shutdown if 35 psig (2.4 bar g ) oil pressure is not achieved within 10 seconds after the initiation of start-up (from when crankshaft starts to turn). If a compressor will not start or shuts down at start-up due to low oil pressure, do not attempt to re-start until the cause of low pressure is corrected. Engine driven compressors with manual pre-lube pumps are to be adequately pre-lubed prior to starting. If 35 psig (2.4 bar g ) oil pressure is not achieved within 10 seconds after reaching engine idle speed, shutdown the compressor and correct the cause. Repeat manual pre-lube prior to each cranking for start-up. Pre-lube pumps are to be located prior to the oil filter. When oil pressure exceeds 35 psig (2.4 bar g ) at start-up, a low oil pressure shutdown set at 35 psig (2.4 bar g ) must be active for all compressors. Oil Heaters Frame oil heaters may be needed if the compressor must be started in cold weather applications. Depending on the operational aspects of the compressor, one possible heating mode is to maintain the temperature in the compressor frame to a minimum temperature so that the compressor can be started immediately if needed, see Table 4-1. Another mode is to heat the oil from ambient to a minimum temperature prior to starting, see Table 4-2. The specific application requirements will determine which heating mode is necessary. Circulation type heaters are recommended. All compressor models have at least one connection for a heater. Four and Six throw frames have two locations. The maximum allowable wattage per unit area for an immersion heater is 15 W/in 2 (2.3 W/cm 2 ). This limit will prevent oil 7/09 PAGE 4 - 9

FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION from coking on the heater element and reducing the efficiency of the heater. It will also prevent the coked oil particles from contaminating the remaining oil. JGU:Z, JGB:V and KBB:V models are designed to use circulation heating only. MODEL TABLE 4-1 HEAT REQUIRED TO MAINTAIN MINIMUM FRAME TEMPERATURE MULTIPLY TIMES DIFFERENTIAL BETWEEN OIL & AMBIENT TEMPERATURE Lube Oil Analysis Sampling Point 2-THROW 4-THROW 6-THROW kW/°F (kW/°C) kW/°F (kW/°C) kW/°F (kW/°C) JGM:N:Q:P 0.0086 (0.0155) --- --- --- --- JG:A 0.0094 (0.0170) 0.0179 (0.0322) 0.0261 (0.0470) JGW:R:J 0.0147 (0.0265) 0.0289 (0.0520) 0.0419 (0.0754) JGH:E:K:T 0.0252 (0.0454) 0.0492 (0.0886) 0.0731 (0.1316) JGC:D 0.0392 (0.0706) 0.0722 (0.1300) 0.1044 (0.1880) JGU:Z 0.0534 (0.0961) 0.0944 (0.1700) 0.1319 (0.2374) JGB:V & KBB:V --- --- 0.1295 (0.2331) 0.1768 (0.3182) MODEL TABLE 4-2 HEAT REQUIRED TO WARM COLD COMPRESSOR FRAME & OIL MULTIPLY TIMES TEMPERATURE RISE DIVIDED BY TIME (h) 2-THROW 4-THROW 6-THROW kW-h/°F (kW-h/°C) kW-h/°F (kW-h/°C) kW-h/°F (kW-h/°C) JGM:N:Q:P 0.0275 (0.0495) --- --- --- --- JG:A 0.0352 (0.0634) 0.0818 (0.1472) 0.1347 (0.3425) JGW:R:J 0.0591 (0.1064) 0.1212 (0.2182) 0.1832 (0.3298) JGH:E 0.1368 (0.2462) 0.2962 (0.5332) 0.4526 (0.8147) JGK:T 0.1494 (0.2689) 0.3024 (0.5832) 0.4526 (0.8147) JGC:D 0.2684 (0.4831) 0.5614 (1.0105) 0.8074 (1.4533) JGU:Z 0.4496 (0.8093) 0.8900 (1.6020) 1.2421 (2.2358) JGB:V & KBB:V --- --- 1.4176 (2.5517) 2.0224 (3.6403) A sampling point should be installed at a convenient location between the oil pump and the filter. This should be installed at an easily accessible location and designed to minimize the amount of dirt or debris that can collect around the dispensing point. A needle valve should be used to better control the flow of the pressurized oil. PAGE 4 - 10 7/09

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