Operating procedures for screw compressors

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This post was last edited by Yiding on 2010-4-1 at 22:53. I. Precautions: a. When using an air hose, ensure that its size is appropriate for the working pressure involved; do not use hoses that are scratched, damaged, or prone to deformation. The types and sizes of the connectors and fasteners at the ends of the hose must also be correct. When releasing compressed air, hold the open end firmly, otherwise the hose may swing around and cause injury. Never direct compressed air at people. Be very careful when using compressed air to clean equipment, and wear goggles. b. Do not operate the compressor in areas where there is a risk of inhaling flammable or toxic gases. c. Do not operate under pressures exceeding those specified on the nameplate, and try to avoid operating at pressures below those specified. d. All canopy side doors must be closed during operation. e. Regularly check (a) the availability of safety devices. (b) The condition of the hose. (c) Whether there is any leakage. (d) All electrical connections shall be secure and in good condition. II. Preparatory work before initial startup a. Remove wooden pegs, shims, clamps, and supports. b. Check whether the wiring is correct. c. Check the setting value of the motor overload relay. d. Check whether the electrical wiring meets the requirements of safety regulations; the insulation must be grounded to prevent short circuits, and the power switch should be located near the unit. e. Fill the gas tank/oil-gas separator until the oil level reaches “70” on the gauge. f. Connect the water supply. g. Close the two discharge valves. h. Connect to the power supply, start it and then stop it immediately to move the motor slightly; check whether the rotation direction matches the direction indicated by the arrow on the sleeve. If not, rewire it. i. Start the unit; after checking for oil leaks during no-load operation, open the air supply valve. j. Gradually close the gas supply valve until the compressor operates under unloaded conditions ； Check whether the unit is operating properly during load operation; pay attention to whether the condensate can be discharged automatically, in order to verify whether the float valve in the water-gas separator is functioning correctly. k. Check the pressure regulator’s unloaded and loaded pressure setpoints. l. Park. m. Drive for 10 minutes and check the oil level; it should be close to the “0” mark on the gauge. III. Before starting: a. Check that the oil level indicated by the oil level gauge is close to the “0” position; if refueling is necessary, do so according to the prescribed procedure. b. Close the water-steam separator and the gas cooling gas discharge valve. IV. Startup a. Connect the water supply. c. Connect to the power supply, start the motor, and check whether the “Power” indicator light is on. d. Press the “Start” button; once started, the “Start” indicator light should turn on while all other alarm indicator lights should turn off. e. Check for oil leaks; the number of startups within one hour should not exceed 10 times. f. Open the air supply valve. g. Press “Load”, and the compressor begins to operate normally and supply air. V. Operation: The following inspections should be carried out regularly: a. The oil level in the air tank/oil-gas separator. If the oil level is too low, add oil until it reaches the “0” position during operation. When adding oil, stop the machine first and relieve pressure before loosening the oil filler plug to add oil. b. Gas supply temperature. c. Float valve of the water-vapor separator, for automatic discharge of condensate. d. The exhaust temperature should not exceed the specified value; the door should be closed after inspection. e. The pressure regulator should be unloaded when the compressor’s operating pressure is at the upper limit, and loaded when it is at the lower limit. VI. Parking a. Close the gas supply valve. b. Press the “Uninstall” button and run it for at least another 30 seconds. c. Press the “Stop” button; the “Run” indicator light goes out and the motor stops. d. Open the drain valve to drain the condensate from the water-gas separator and the gas cooler. e. Drain the cooling water from the cooler.