(Daily Question) Coal-to-oil and olefins forum, 1.4.2018

1. Since metering pumps are dynamic equipment, their moving parts raise the issue of lubrication. Before starting, it is necessary to ensure that the transmission gearbox has been filled with the required amount of lubricating oil – this is something that only needs to be checked for piston-type metering pumps. For hydraulic diaphragm metering pumps, hydraulic oil also needs to be poured into the hydraulic chamber. Next, it is important to check whether the inlet and outlet valves of the pump are fully open. Finally, it is necessary to confirm that the rotation direction of the motor is correct. 2. Pump startup: Once the above basic parameters are determined, the pump can be started. 3. Verification of operation after startup: After a new pump is installed or after it has been repaired, it is necessary to recalibrate the pump once it is started up. First, the plunger’s zero position needs to be calibrated. Second, in the case of hydraulic diaphragm metering pumps, it is required to vent the hydraulic oil chamber; this is usually done manually for single-diaphragm metering pumps, while it is automated in double-diaphragm pumps. Third, double-diaphragm metering pumps also require venting between the two diaphragms, and this must be carried out according to the specifications provided by each manufacturer. Only after all three aspects have been confirmed can it be said that the metering pump has been started correctly.

(1) Check whether the lubricating oil level of the metering pump is normal. (2) Set the stroke to zero. (3) Open the inlet and outlet valves fully. (4) Start the motor. (5) Adjust the stroke to the desired position

(1) Check whether the lubricating oil level of the metering pump is normal. (2) Set the stroke to zero. (3) Open the inlet and outlet valves fully. (4) Verify that the motor is rotating in the correct direction before starting it. (5) Adjust the stroke to the desired position

(1) Check whether the lubricating oil level of the metering pump is normal. (2) Set the stroke to zero. (3) Open the inlet and outlet valves fully. (4) Start the motor. (5) Adjust the stroke to the desired position

1. Preparation checks before starting the pump: First, it is necessary to verify whether the pump’s installation meets the required standards, which should be determined according to the specifications set by each manufacturer. 　　Since metering pumps are mechanical devices, their moving parts raise the issue of lubrication. Before starting, it is necessary to ensure that the transmission gearbox has been filled with the required amount of lubricating oil – this is something that only needs to be checked for piston-type metering pumps. For hydraulic diaphragm metering pumps, hydraulic oil also needs to be poured into the hydraulic chamber. Next, it is important to check whether the inlet and outlet valves of the pump are fully open. Finally, it is necessary to confirm that the rotation direction of the motor is correct. 　　2. Pump start-up: The pump can be started once the above basic parameters have been determined. 　　3. Verification of operation after startup: When a new pump or a pump that has been overhauled is started, it is necessary to recalibrate the pump. First, the plunger’s zero position needs to be adjusted. Second, in the case of hydraulic diaphragm metering pumps, it is required to vent air from the hydraulic oil chamber; this is usually done manually for single-diaphragm metering pumps, while double-diaphragm pumps handle this process automatically. Third, double-diaphragm metering pumps also require venting air between the two diaphragms, and this must be carried out according to the specifications provided by each manufacturer. 　　Only after all three aspects have been confirmed can it be said that the metering pump has been started correctly.

(1) Check whether the lubricating oil level of the metering pump is normal: (2) Set the stroke to zero: (3) Open the inlet and outlet valves fully: (4) Start the motor: (5) Adjust the stroke to the desired position

First, open the inlet and outlet valves of the pump, then set the pump’s stroke to zero, start the pump, and subsequently adjust the pump’s stroke or frequency to an appropriate value.

　1. Preparation checks before starting the pump: First, it is necessary to verify whether the pump’s installation meets the required standards, which should be determined according to the specifications set by each manufacturer. 　　Since metering pumps are mechanical devices, their moving parts raise the issue of lubrication. Before starting, it is necessary to ensure that the transmission gearbox has been filled with the required amount of lubricating oil – this is something that only needs to be checked for piston-type metering pumps. For hydraulic diaphragm metering pumps, hydraulic oil also needs to be poured into the hydraulic chamber. Next, it is important to check whether the inlet and outlet valves of the pump are fully open. Finally, it is necessary to confirm that the rotation direction of the motor is correct. 　　2. Pump start-up: The pump can be started once the above basic parameters have been determined. 　　3. Verification of operation after startup: When a new pump or a pump that has been overhauled is started, it is necessary to recalibrate the pump. First, the plunger’s zero position needs to be adjusted. Second, in the case of hydraulic diaphragm metering pumps, it is required to vent air from the hydraulic oil chamber; this is usually done manually for single-diaphragm metering pumps, while double-diaphragm pumps handle this process automatically. Third, double-diaphragm metering pumps also require venting air between the two diaphragms, and this must be carried out according to the specifications provided by each manufacturer. 　　Only after all three aspects have been confirmed can it be said that the metering pump has been started correctly.

1. Preparation checks before starting the pump: First, it is necessary to verify whether the pump’s installation meets the required standards, which should be determined according to the specifications set by each manufacturer. 　　Since metering pumps are mechanical devices, their moving parts raise the issue of lubrication. Before starting, it is necessary to ensure that the transmission gearbox has been filled with the required amount of lubricating oil – this is something that only needs to be checked for piston-type metering pumps. For hydraulic diaphragm metering pumps, hydraulic oil also needs to be poured into the hydraulic chamber. Next, it is important to check whether the inlet and outlet valves of the pump are fully open. Finally, it is necessary to confirm that the rotation direction of the motor is correct. 　　2. Pump start-up: The pump can be started once the above basic parameters have been determined. 　　3. Verification of operation after startup: When a new pump or a pump that has been overhauled is started, it is necessary to recalibrate the pump. First, the plunger’s zero position needs to be adjusted. Second, in the case of hydraulic diaphragm metering pumps, it is required to vent air from the hydraulic oil chamber; this is usually done manually for single-diaphragm metering pumps, while double-diaphragm pumps handle this process automatically. Third, double-diaphragm metering pumps also require venting air between the two diaphragms, and this must be carried out according to the specifications provided by each manufacturer. 　　Only after all three aspects have been confirmed can it be said that the metering pump has been started correctly. Attention! ! ! Precautions for the first start-up of a metering pump: 1) Rotate the adjustment dial counterclockwise to position 0 (the minimum stroke of the pump), zero the gauge, reinstall it and secure it in place, then set the plunger stroke to 30%–40% of the maximum stroke. 2). During the first start-up, let the pump run for 10–20 seconds before stopping it for 20–30 seconds; repeat this process at least 10 times to fill the diaphragm oil chamber. During this operation period, pay attention to any abnormal noises from the motor or other moving parts, and address any issues promptly. 3). At zero pressure, run the pump for about an hour, then gradually increase the stroke while checking the flow rate in the discharge pipeline, and preheat the oil temperature in the frame. 4). Set the flow rate to 100% of its maximum value, and gradually increase the pressure to the rated value; operate for 30–60 minutes. Check for leaks at the plunger packing seal (the leakage rate should be controlled at one ten-thousandth of the flow rate; 1 milliliter is approximately 15 drops) as well as the temperature rise of all moving parts (the temperature of the lubricating oil should not exceed 60°C during continuous long-term operation).

1. Since metering pumps are dynamic equipment, their moving parts raise the issue of lubrication. Before starting, it is necessary to ensure that the transmission gearbox has been filled with the required amount of lubricating oil – this is something that only needs to be checked for piston-type metering pumps. For hydraulic diaphragm metering pumps, hydraulic oil also needs to be poured into the hydraulic chamber. Next, it is important to check whether the inlet and outlet valves of the pump are fully open. Finally, it is necessary to confirm that the rotation direction of the motor is correct. 2. Pump startup: Once the above basic parameters are determined, the pump can be started. 3. Verification of operation after startup: After a new pump is installed or after it has been repaired, it is necessary to recalibrate the pump once it is started up. First, the plunger’s zero position needs to be calibrated. Second, in the case of hydraulic diaphragm metering pumps, it is required to vent the hydraulic oil chamber; this is usually done manually for single-diaphragm metering pumps, while it is automated in double-diaphragm pumps. Third, double-diaphragm metering pumps also require venting between the two diaphragms, and this must be carried out according to the specifications provided by each manufacturer. Only after all three aspects have been confirmed can it be said that the metering pump has been started correctly.