【Daily Question 2019】LNG Section – Question No. 4-24

Visual inspection, vibration inspection, outlet pressure inspection, etc

Answer: (1) Wear the appropriate personal protective equipment, prepare the necessary tools, and clean the area around the pump； (2) Check that the pumps, pressure gauges, coupling covers, coupling bolts, foundation bolts, valves, and pipeline flange gaskets are in good condition ； (3) Verify that the inlet and outlet processes and the fluid level meet the conditions for starting the pump ； (4) Open the inlet valve and slightly open the pump outlet vent valve; once oil is visible in the vent and no gas is present, close the vent valve ； (5) Check that the cooling water for the pump is functioning properly ； (6) Verify that the quality of the lubricating oil is acceptable and the amount is appropriate ； (7) Manually turn the shaft two full turns; there is no unevenness in the torque ； (8) Check that the hot oil pump is preheating properly; ensure all checks are completed before starting the pump

1. Rotate the pump to check for any sticking. 2. Check the lubricant level and quality. 3. Check the status of the inlet and outlet valves of the pump. 4. Check the power indicator light on the control panel. 5. Check the pressure gauge at the pump’s outlet

1. Check whether parameters such as the voltage and current of the drive motor, as well as the water outlet pressure of the water pump, are within normal ranges. If any abnormalities are detected, the cause must be investigated; if necessary, stop the pump for inspection. 2. Check the operating sound and vibration of the unit. 3. Check whether the packing gland is properly tightened, whether there is normal dripping, and whether the packing box is overheating. 4. Check whether the bearing is operating properly (oil temperature, oil level, oil quality) and whether there are any abnormal noises. 5. Check whether the temperature of the motor windings is normal and whether the temperature rise exceeds the allowable value. 6. Check whether there are any unusual odors in the pump room; if a burnt smell is detected, it is necessary to verify whether electrical equipment such as the motor is functioning properly, and the machine should be shut down for a thorough inspection if needed. 7. Pay attention to checking the water level in the tank to prevent the pump from running dry.

1. Clean away the dirt, rags, and other debris around the pump; ensure that the pump body and motor are clean. 2. Prepare the necessary tools: adjustable wrenches, oil containers, screwdrivers, valve wrenches, stethoscopes

1 Pump and auxiliary systems  (1) Check for any abnormal vibrations in the pump.  (2) Check whether the bearing temperature is normal.  (3) Check if the lubricant level is within the normal range.  (4) Verify that the temperature and pressure of the lubricant are normal.  (5) Check the return flow of the lubricant to ensure it is functioning properly.  (6) Confirm that the quality of the lubricant meets the requirements.  (7) Check that there are no leaks.  (8) Verify that the sealing fluid is in good condition.  (9) Ensure that the cooling medium used for sealing is functioning properly.  (10) Check that the cooling water is operating normally. 2 Power equipment  (1) Check whether the motor is running properly (refer to the motor operation guidelines).  (2) Verify that the speed of the turbine is stable and within the normal range (refer to the turbine operation guidelines). 3 Process system  (1) Check whether the pressure at the pump inlet is stable and normal.  (2) Check whether the pressure at the pump outlet is stable and normal. 4 Others  (1) Rotate the standby pump as specified.  (2) Take precautions against freezing in winter 

1. Clean the dirt, rags, and other debris around the pump; maintain cleanliness of the pump body and motor

1. Clean the dirt, rags, and other debris around the pump; ensure that the pump body and motor are in clean condition. 2. Prepare the commonly used tools: adjustable wrench, oil can, screwdriver, valve wrench, stethoscope, rag, etc. 3. Contact the electrician to supply power, carry out inspection work, and turn the motor manually in its operating direction. 4. Check all attachments and protective covers to ensure they are firmly installed and in good working condition.

1. Check whether parameters such as the voltage and current of the drive motor, as well as the water outlet pressure of the water pump, are within normal ranges. If any abnormalities are detected, the cause must be investigated; if necessary, stop the pump for inspection. 2. Check the operating sound and vibration of the unit. 3. Check whether the packing gland is properly tightened, whether there is normal dripping, and whether the packing box is overheating. 4. Check whether the bearing is operating properly (oil temperature, oil level, oil quality) and whether there are any abnormal noises. 5. Check whether the temperature of the motor windings is normal and whether the temperature rise exceeds the allowable value. 6. Check whether there are any unusual odors in the pump room; if a burnt smell is detected, it is necessary to verify whether electrical equipment such as the motor is functioning properly, and the machine should be shut down for a thorough inspection if needed. 7. Pay attention to checking the water level in the tank to prevent the pump from running dry.

Pressure, current, oil level, vibration