Heavy Duty Balanced Opposed Compressors - Ariel Corporation

13.11.2012 Views
FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION lead or copper based bearing materials. Frame Oil System Components Oil Strainer An oil strainer, installed upstream of the pump will prevent very large particles and objects from getting into the pump. Ariel supplies a 30 mesh (595 microns) strainer on all JGM:N:P:Q:JG:J:A:R:W:H:E:K:T compressors and a 40 mesh (400 microns) strainer on all JGC:D:U:Z:B:V, KBB:V compressors. Oil Pump The oil pump constantly supplies oil to all the journal bearings, bushings and crosshead sliding surfaces. The pump is direct coupled to the crankshaft by a chain and sprocket and is designed to provide adequate oil flow to the bearings when the compressor is operating at the Minimum Speed rating (typically one-half of maximum allowable frame speed). The compressor frame driven lube oil pumps maintain oil pressure with a spring loaded regulating valve within the pump head (some models have a separate pressure regulator). Lube system pressure can be raised or lowered by adjusting the spring tension on this valve. Oil Cooler An oil cooler is required and the packager is responsible for sizing the oil cooler. Ariel can supply the oil cooler as a purchased separately item. Factors that must be taken into account while sizing a cooler, are the cooling medium, cooling medium temperature, cooling medium flow rate, lube oil temperature, and lube oil flow rate. Oil heat rejection data for each frame is available in the Ariel Electronic Data Book (contact your Packager or Ariel when you need this information). The Data Book also specifies the required flow rate and temperature of cooling water necessary to properly cool the oil with Ariel supplied coolers. Insufficient cooling water flow rate is the primary cause of high oil temperatures. The cooler should be mounted as close to the compressor as possible, with piping of adequate size to minimize pressure drop of both the lubricating oil and the cooling medium. 7/09 PAGE 4 - 7

FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION Oil Temperature Control Valve Thermostatic valves are required in conjunction with the cooler to control the oil temperature in the compressor. The thermostatic valve is a three way valve that has a temperature sensitive element. As the oil is heated the sensing element will open the third port in the valve. There are two configurations for installing a thermostatic valve: diverting mode and mixing mode. Ariel recommends installation of the thermostatic valve in the mixing mode. In the mixing mode, as the oil heats up, the element opens a port in the thermostatic valve that allows oil from the cooler to mix with the hot oil from the bypass. In the diverting mode, the oil is diverted to the cooler when the oil from the compressor is hot enough to open the valve. The diverting mode monitors the temperature of the oil coming out of the compressor. The mixing mode monitors the temperature of the oil going into the compressor. Oil Filtration Oil filters are required on all compressor frames to remove contamination that can damage the equipment and contamination that can damage the oil. Contaminants that damage the equipment can be: • Wear particles from the equipment Lube Oil from Main Oil Pump • Airborne particles such as dust or sand • Solid particles from the gas stream • Dirt from new oil from the refinery Contaminants that damage the oil can be: Lube Oil Cooler Lube Oil to Main Oil Filter Thermostatic Control Valve Thermostatic control valve 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. FIGURE 4-2 LUBE OIL THERMOSTATIC VALVE IN MIXING MODE • Soot (commonly from combustion in an engine) • Oxidized oil components • Air bubbles The JGC/4, JGD/4, JGU/4, JGZ/4, JGB/4, JGV/4, KBB/4, KBV/4, JGE/6, JGK/6, JGT/6, JGC/ 6, JGD/6, JGU/6, JGZ/6, JGB/6, JGV/6, KBB/6 and KBV/6 compressors are equipped with simplex, cartridge style pleated synthetic type filters as standard. Cartridge filters are rated as 1 micron nominal and 12 micron absolute filters. The Beta ratings are ß1 = 2, ß5 = 10 and ß12 = 75. All other Ariel frames are equipped with simplex, spin-on resin-impregnated type filters as standard. Spin on filters have a 5 micron nominal and 17 micron absolute rating. The Beta ratings are ß5 = 2 and ß17 = 75. There are many spin on filters that will fit an Ariel compressor, but very few meet the filtration PAGE 4 - 8 7/09 B A C

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