X stand 6 # compressor column 6 connecting rod fault case

X stand 6 # compressor column connecting rod navarre fault case 2020-6 11 - 04 north China branch of a plant equipment shall case 01 compressed daniudi gas field X stand yu Yang district is located in yulin city in rural village of knife rabbit rabbit, design of natural gas processing scale & 50 times; 108 nm3 /。 Pressurization process built and put into production in December 2013, glycol was main function is to deal with after pressurization transmission of natural gas. 11 station core equipment for domestic large electric displacement reciprocating natural gas compressor. Six models for 6 rdsa - # compressor 1 / YZYKK710 - 6 g, single power of 3000 kw, adopt symmetrical balance type reciprocating piston compressor, compression six-cylinder level, has the characteristics of high speed balance. Single machine design flow are 151. 44 ~ 525报; 104 nm3 / d, inlet pressure 2. 0 ~ 4. 50 mpa, exhaust pressure 4 design. 85-6. Lubricating oil pressure 0 0 mpa, design. 35 ~ 0. 42 MPa。 6 # compressor before failure due to the electricity grid shakes, entrance ESDV ball valve shutoff, cause the compressor stops abnormally 3 times. 02 event after a March 1, 2017, at 11:00 am 6 # compressor rev machine running, loading operation, 11:30 vibration alarm unit drive on the downtime. On checking the fifth column, the column 6 crosshead slide side have pap alloy and copper alloy powder ( See figure 1) , remove the connecting rod, found that column 6 connecting rod serious wear and tear on a central crack, oil groove edge burr ( See figure 2) In the crankshaft journal have quantity babbitt felt; Fifth column connecting rod moderate wear, and the crankshaft journal with a small amount of babbitt metal bond. Fault occurs, the 6 # unit total running time of 10678 h, three-level maintenance after the running time of 778 h. Figure 1:6 column cross side powder in figure 2:6 column cross side powder 03, measures to 1. On-site screening crankcase each connection position, check vibration detector sensor and its wiring. 2. Further inspection of the operation of the main oil pump, open the crankcase, without exception. 3. Check the connecting rod, the spindle watts, found that five columns, 6 columns connecting rod navarre, crank shaft neck babbitt felt, was carried out on the crankshaft grinding, grinding was carried out on the five columns connecting rod repair, replace 6 column connecting rod. 4. Clean up the crankcase oil sump metal particles, inspection on lubrication system, change the lubricating oil and filter cartridge. 5. Start the compressor no-load commissioning, observe the parameters such as compressor oil pressure, vibration, temperature, normal load after operation. 04 original for analysis, the direct reason for unit load stops abnormally on the impact of units, lead to bearing shell strain. The indirect reason 1. Earlier unit has three stops abnormally, the impact of unit, the connecting rod has certain impact injury and abnormal wear and tear. 2. Unit design flaws, in the case of sudden failure or a power outage, compressor stop saying of lubrication, the lubrication does not reach the designated position, lubrication part caused a certain degree of wear and tear. 3. Lavoie five columns, column 6 connecting rod everywhere in the end of the main oil passage, oil pressure when the emergency stop, the lowest amount of lubricating oil is in short supply. 05 fan measures on 1. Compressor unit power supply reliability, improve yard ESD system reliability, reduce the abnormal downtime. 2. To improve the compressor control logic, the auxiliary pump instead of UPS power supply, make the compressor in the case of sudden power outages, normal boot after lubrication system, ensure the normal lubrication parts after downtime. 3. In accordance with the requirements for maintaining regular replacement of oil filter, ensure the filtering effect, ensure clean oil, reducing impurity damage in friction pair in the lubricating oil. 4. In accordance with the regulations for the lubricating oil regularly to test the product, found the abnormal situation timely stop trying.