[Q&A Question 184] 2018.07.08

1. Check the measuring instruments. The proper operation of the compressor unit is checked using the monitoring data listed below. During the first 3 months of operation, record the actual readings in the work log at intervals of not less than 1 hour; after those 3 months, make entries in the work log at intervals of 4 hours for: a. inlet pressure, b. inlet temperature, c. outlet pressure, d. outlet temperature, e. oil pressure before the oil cooler (= after the oil pump), f. oil temperature after the oil cooler, g. oil pressure after the oil filter (= at the control valve). (Adjust as necessary through the control valve) h. Pressure difference across the oil filter; i. Oil pressure before the bearings; j. Bearing temperature (adjust the oil flow rate if necessary); k. Oil level in the tank; l. In addition to monitoring the instruments built into the unit, it is also important to check for any scraping noises during operation of the compressor, as well as any leaks of oil, gas, or water. 2. Matters to note during operation: (1) Thoroughly check for leaks; any leaks found must be corrected immediately, as hydrogen is odorless and difficult to detect, and it can explode upon contact with sparks, resulting in serious safety accidents. (2) The vibration and temperature of the compressor should be monitored through continuous measurement. (3) To ensure that oil flows through the bearings of the compressor, all oil sight glasses in the oil outlet lines should be checked regularly. (4) Clean the fuel tank. Once a month, remove any water and sludge that may have accumulated in the fuel tank. The inlet coarse filter inside the oil pipeline should be cleaned regularly. (5) Check the oil filter/cooler. Monthly (but immediately switch the dual oil coolers or oil filter to the backup units if the oil temperature downstream of the oil cooler rises or the pressure difference across the oil filter increases). Before switching to the oil cooler, the cooling water for the backup cooler should be turned on. Also open the vent valve on the water tank until water flows out through it, after which the valve should be closed. (6) Check the pressure difference gauge on the filter: if the gauge reading is close to zero, the filter is damaged or leaking! (7) When switching to the backup cooler and backup filter, it should be done slowly, and this can be carried out while the compressor unit is running. Used coolers or filters must have the oil and sludge removed, and then solid contaminants should be eliminated through flushing, brushing, or the use of chemical solutions. If the filter element is found to be damaged, a new filter element must be replaced. Note: Every time a oil cooler or oil filter is replaced, it must be recorded in the work log! Inspection: Manually ventilate the float trap once per shift by activating the float rod (if an oil trap is provided). At least after each inspection, it is necessary to check whether the safety valve and all other protective devices are functioning properly. (8) The drainage pipes should be checked once a week to ensure they are not blocked. (9) Check the oil. During operation, this compressor should have its oil quality checked every 3 months to ensure it is normal (during the first 3 months of operation, checks are required on a monthly basis). If it no longer meets the specified parameter values, the oil should be replaced. All oil changes must be recorded in the work diary, indicating the amount of oil replaced and the grade of the oil. (10) Check the cooling water. The cooling water should also be checked once a month. The measured analytical values should be compared with those specified in the technical specifications at the time of ordering the compressor unit. The analysis values from each inspection and measurement of the cooling water must be recorded in the work diary!

Check whether any tools or components left over from maintenance have entered the compressor cylinder, and also verify that the air valves are installed correctly.

①Confirm that the machinery, electrical systems, and instruments are in good condition； ②Verify that the lubricating oil pressure and temperature are normal, and that the oil cooler is in operation ； ③No jamming when turning the crank manually ； ④Verify valve status ； ⑤Start the host, slowly open the inlet valve, and load it.

1. Check the lubricating oil pressure, which should be within the normal range of 0.2–0.4 MPa. 2. Check that the cooling water discharge temperature is ≤37–40°C. 3. Check the temperature of the lubricating oil in the engine’s oil sump; it should not exceed 60°C. 4. Check the temperature of the spindle bearing pads; it should not exceed 70°C. 5. Check the exhaust temperature; it should not exceed the set value. 6. Check the exhaust pressure; it should not exceed the set value. 7. Check whether the instruments in the automatic control section are functioning properly, and whether the ammeter readings are normal. 8. Check whether the intake valve cover is hot and whether the sound of the valve is normal. 9. Pay attention to listening for any abnormal noises or impacts as the various components operate. 10. Eliminate oil, water, and air leaks in all areas. 11. Keep records of the compressor’s operating conditions.

Various temperatures, various pressures, vibration, circulating water pressure, lubricating oil pressure, current.

(1) Check for any abnormal phenomena such as impacts or collisions inside the cylinder； (2) Check the lubrication and cooling conditions

(1) Check for any abnormal phenomena such as impacts or collisions inside the cylinder； (2) Check the lubrication and cooling conditions

Check: Whether the intake and exhaust temperatures and pressures are abnormal； Is there an issue with the oil pump system? ； Is the bearing temperature abnormal? ； Are there any abnormal noises from the reciprocating components? ； Is there any leakage from the filler? ； Are the intake and exhaust valves And the main oil pump reliable? ； Are the safety valves and bypass valves leaking? ； Are all the parameters of the motor normal? ； Are the cooling water flow rate, temperature, and color normal? ； Check for leaks at the connections of each fitting.

(1) Check for any abnormal phenomena such as impacts or collisions inside the cylinder； (2) Check the lubrication and cooling conditions ； (3) Check the outlet pressure; the exhaust volume meets the process requirements

1. Check the lubricating oil pressure, which should be within the normal range of 0.2–0.4 MPa. 2. Check that the cooling water discharge temperature is ≤37–40°C. 3. Check the temperature of the lubricating oil in the engine’s oil sump; it should not exceed 60°C. 4. Check the temperature of the spindle bearing pads; it should not exceed 70°C. 5. Check the exhaust temperature; it should not exceed the set value. 6. Check the exhaust pressure; it should not exceed the set value. 7. Check whether the instruments in the automatic control section are functioning properly, and whether the ammeter readings are normal. 8. Check whether the intake valve cover is hot and whether the sound of the valve is normal. 9. Pay attention to listening for any abnormal noises or impacts as the various components operate. 10. Eliminate oil, water, and air leaks in all areas. 11. Keep records of the compressor’s operating conditions.