Steps to stop the compressor

I’m not sure if this will be useful to you. 2DW-56/0.6-8.7 type chloromethane compressor. 1. Close the suction ball valve. 2. Stop the motor. 3. Close the outlet stop valve, open the bypass valve, and open the vent valve to release pressure completely. 4. Go to the control room and press the “Oil Pump Stop” button. “Press the “PLC Power Off” key, and set the start selection key to the neutral position.

1 Before starting up: a. Check the “shift handover record”. Check the tightness of fasteners such as the foundation nuts of the air compressor and the valve cover nuts of each intake and exhaust valve. Check whether the power supply voltage is normal. d. Check the tightness of the V-belt and whether the coupling is properly installed. e. Check whether the safety protection devices of the air compressor are reliable, whether the instruments are functioning properly, and whether all the pipeline valves are in good condition. f. Check whether the oil levels in the aircraft’s oil sump and the filler are normal. g. Open the inlet and outlet valves, start the circulation water pump to ensure smooth water flow, and check for any leaks at the connections. h. Close the unloading valve (or open the exhaust bypass vent valve) to reduce the starting load of the air compressor. j. Check whether the start buttons for the electrical appliances and the air compressor motor are in the start position. Power can be turned on to start the device if there are no issues. 2. Start up and operate: a. First, toggle the motor start switch in intermittent mode to listen for any abnormal noises from the various moving parts of the air compressor. The motor can be started only after confirming normal operation. b. After the motor starts, the air compressor should run idle for 5-6 minutes, after which the intake valve should be gradually opened to introduce load. c. When the air compressor is in operation, it is necessary to regularly check whether the level of oil in the oil reservoir of the compressor, as well as the oil level and the number of oil drops in the oil filler, are within normal ranges. Constantly monitor and check the readings on all pressure gauges and temperature gauges to ensure they remain within the specified allowable ranges. Taking the 4L?/FONT>20/8 air compressor as an example: the exhaust pressure gauge at the first stage should be 0.2?/FONT>0.22 MPa, not exceeding 0.24 MPa ； The secondary exhaust pressure gauge should read 0.78 MPa, not exceeding 0.82 MPa ； The lubricating oil pressure gauge should read 0.1?/FONT>0.2 MPa, and it must not be lower than 0.1 MPa ； The exhaust temperature at all levels shall not exceed 160 degrees. The exhaust temperature of the cooling water shall not exceed 40 degrees. The oil temperature inside the engine body should not exceed 60 degrees. e. Continuously monitor the temperature rise of the motor, as well as the readings on the ammeter and voltmeter; these values should remain within the specified allowable ranges. f. When the pressure in the gas storage tank reaches the specified value, it is necessary to check whether the safety valve and pressure regulator operate promptly and reliably ； Periodically perform manual or automatic venting tests on the safety valve. g. When the air compressor is in operation, the oil and water in the oil-water separator must be drained every 2 hours of operation; the condensed oil and water in the air storage tank should be drained once per shift. The frequency of drainage should be increased when the air temperature is high. h. The air compressor should be shut down urgently under the following conditions; the cause must be identified and resolved before it can be restarted. The primary and secondary exhaust pressure gauges suddenly exceed the specified values ； ②If the supply of cooling water is suddenly interrupted, and the machine is operated for a long time after the water supply is cut off, it is absolutely not advisable to inject new cooling water into the cylinder water jackets immediately; instead, wait until the cylinders have cooled down on their own before resuming operation by supplying water ； ③The temperature of any part of the air compressor exceeds the allowable value ； ④The air compressor emits abnormal noises, such as metal collisions and looseness at various connections ； ⑤When the supply of lubricating oil is suddenly interrupted ； ⑥When the air compressor has severe air or water leaks ； ⑦When there is severe sparking at the primary circuit connection between the slip ring and brushes of the motor ； ⑧When other serious faults are detected ； ⑨When maintaining air compressor equipment, the power supply must be turned off first, and any remaining air in the equipment and pipelines must be drained before proceeding. When cleaning the cylinder and valve components, kerosene should be used (gasoline is not allowed); after cleaning, wait until all the kerosene has evaporated before assembling them. During maintenance and disassembly, debris such as wood chips, pieces of leather, cotton yarn, etc., must not fall into the cylinders, air storage tanks, or air pipelines, to prevent blockages that could lead to accidents ； ⑩When the air compressor is in operation, every hour, each measurement value, operational status, and results of routine equipment inspections should be recorded in the operation and inspection logbook. 3 Shutdown a. Gradually close the load-reduction valve (or open the exhaust bypass vent valve) to bring the air compressor into no-load operation. b. Cut off the power supply. c. The circulating water pump can be stopped and the cooling water inlet valve can be closed only 15 minutes after the air compressor is shut down. d. Drain the oil and water condensed in the intercooler and air reservoir ； In cold winter conditions, all water stored in the water jackets at various levels and in the intercooler should be drained to prevent the engine block from cracking due to freezing. e. Perform routine maintenance. f. Fill out the \"Shift Handover Record\" to ensure proper handover of duties.

1. The on-site operators reduce the load of the unit by using the load control selector switches on the on-site control cabinet, from 100% to 50% to 0%. 2. Confirm that the unit is under no load, shut down the main motor; after the compressor stops operating, shut down the oil injector as well. 3. Isolate the process gas system, close the inlet and outlet valves, and vent the vessel. 4. After the inlet and outlet pressures are balanced, start the turning device to turn the unit. Close the nitrogen supply valve of the compressor isolation chamber, and drain condensate from the unit inter-stage separator and the unit’s middle section. 5. Once the unit’s barring rotation is complete and the oil pump has been running until the bearings reach normal temperature, the on-site operator manually shuts down the oil pump. 6. If the parking time is long, cool the cylinder cooling system, the inter-stage water coolers, the compressor oil station water coolers, the water station water coolers, and the motor water coolers using cooling water.

There are two types of compressor shutdowns: normal shutdown and emergency shutdown. In a normal shutdown, the dry gas seal is switched off, the compressor’s load is reduced, and the valves are opened to induce surge until the anti-surge valves are fully open. Once the rotational speed has dropped to an appropriate level, the shutdown button can be pressed to stop the compressor. After that, the warm pipe vent is activated, steam drainage is enabled, and the main steam valve is closed

It doesn’t matter how to park the vehicle; what’s important is to pay attention when starting the compressor. First, open the outlet (there’s no need to mention checking the oil and water levels, etc.). In our company, failing to open the outlet first caused the compressor piston to break, leading to serious consequences including even an explosion. As for shutting down the machine, it’s obvious what to do – it’s not important

Run it at level 1 first to reduce the load. Close the outlet valve and drain it upside down. Shut down the host again.

Another very important point is that you must perform an N-substitution after parking; otherwise, the chlorosilane liquid will cool down, which is not good for the compressor.

Shutting down procedures: Shutdowns generally fall into two categories: normal shutdown and emergency shutdown. Shutdowns that are carried out according to pre-planned schedules, or as required by the operation of the unit and with the approval of higher authorities, are considered normal shutdowns; they are also known as planned shutdowns or routine shutdowns. On the other hand, shutdowns that occur when the unit cannot operate properly due to equipment failures or accidents, and are implemented in order to prevent the accident from worsening, are emergency shutdowns. The reasons and purposes for these two types of shutdowns differ, and accordingly, the procedures for carrying out them also vary. 1. Normal shutdown. 1.1 Notify the control center to reduce load and prepare for shutdown. 1.2 After the unit is running steadily at no load and at the rated speed, press the “Normal Shutdown” button to reduce the turbine speed until it stops. Calculate the coasting time. 1.3 Supply power to the barring motor; once the turbine has stopped rotating, activate the barring mechanism. 1.4 Depending on the degree of load reduction, cut off the steam extraction from the turbine at the appropriate time, that is, close the extraction quick-shut valve (to prevent steam from the extraction pipeline from flowing back into the turbine). 1.5 Adjust the seal steam for the shaft seals in a timely manner as the rotational speed decreases. 1.6 Pay attention to the liquid level in the condenser hot well, and adjust the condensate recirculation rate in a timely manner. 1.7 Central control room or on-site emergency shutdown: To shut down the system from the central control room, press the “Emergency Shutdown” button on the control governor panel. In the event of an on-site shutdown, press the manual shutdown button or the shutdown solenoid valve. 1.8 After shutdown, check whether the quick-shut valves, the control steam valves, the intermediate extraction control steam valves, and the extraction quick-shut valves are closed; record the rotor coastdown time and listen to the sounds inside the turbine. 1.9 Stop the main exhaust pump. 1.10 When the rotational speed is below 500 r/min and the vacuum drops to -20~-30 kPa, stop the pump and cease supplying steam to the shaft seal. It is strictly prohibited to stop the shaft seal steam prematurely. 1.11 Activate all drain valves on the turbine itself and its pipelines. 1.12 The condensate pump shall continue to operate; when the temperature of the hot well is below 50°C, switch the control switch of the condensate pump to the “manual” position to stop it. 1.13 Keep the oil temperature at 35°C during shutdown. Stop the barring gear as appropriate, and switch the transfer switch of the lubricating oil pump to the “manual” position to stop the operation of the oil pump. 1.14 Close the primary and secondary gate valves of the main steam pipeline, as well as the water supply valves in various pipelines and the turbine’s own drain valves. 2 Emergency Shutdown 2.1 Items related to emergency shutdown 2.2 The unit’s speed increased to the overspeed trip speed of 13,026 rpm/min without an emergency shutdown occurring. 2.3 The vibration of the unit suddenly increases, with the amplitude reaching or exceeding the specified limit values. 2.4 Abnormal noises are heard from the unit. 2.5 Water hammer occurred in the unit. 2.6 Sparks occur at the shaft seal. 2.7 If the temperature of any bearing in the unit rises sharply, reaching the specified limit value (for turbines: ≥120℃ ； Compressor ≥115℃ ； ). 2.8 Sudden increase in the shaft displacement of the rotor exceeding the specified limit value (for turbines: ≥0.6 mm) ； Compressor ≥ 0.7mm). 2.9 The oil system catches fire and the fire cannot be extinguished quickly. 2.10 Rupture of the main steam pipe or pressure oil pipe. 2.11 The vacuum or extraction steam pressure suddenly exceeds the limit value. 2.12 Accidents occur in the process system (sudden changes in steam parameters, loss of circulating water, loss of steam). 2.13 All other factors requiring an emergency stop. 3 Emergency shutdown steps. 3.1 Immediately contact the dispatcher on-site or in the control room to inform the relevant personnel; shut down the equipment on-site or press the “Emergency Stop” button, while in the control room press the “Emergency Stop” key on the governor control panel. In cases of emergency, it is possible to shut down the equipment first and then get in touch. 3.2 Confirm high compressor pressure ； The anti-surge valve and vent valve of the low-pressure cylinder are fully open. 3.3 Ensure that the quick-shut valve, steam valve, intermediate extraction control valve, and extraction quick-shut check valve are all in the fully closed position. 3.4 To stop the rotor as quickly as possible, the vacuum should be broken, the pump should be stopped, and the exhaust safety valve should be opened. The vacuum is zero; stop supplying steam to the shaft seal and shut down the shaft seal cooler. 3.5 After the rotor has come to rest, barring emergency shutdowns caused by internal unit failures such as loss of oil supply to the bearings, bearing burnout, or severe damage to the rotor, the rotor should be turned immediately. 3.6 Other operations are the same as those for normal shutdown.