(Daily Question) Coal-to-Oil and Olefins Forum, April 10, 2018
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3.jpg Participation: Prize of 5 Wealth； Correct answer: Reward of 10 wealth points ； Note: This post is valid for 48 hours. Question and answer: (DMTO) Olefin separation unit: Items to be checked before switching the cryogenic pump: (1) Is the lubricating oil level normal? ； (2) Is the pump pre-cooling satisfactory? ； (3) Is the barring gear operating normally? ； (4) Is the white oil level normal? ； (5) Is the valve switched on correctly? ； Note: The answers will be announced automatically in two days!
Answer: (1) Is the lubricating oil level normal?； (2) Is the pump pre-cooling satisfactory? ； (3) Is the barring gear operating normally? ； (4) Is the white oil level normal? ； (5) Is the valve switched on correctly? ；
A. Is the lubricating oil level normal? B. Is the pump pre-cooling satisfactory? C. Is barring operation normal? D. Are all valves opened/closed correctly?
1. Check whether the anchor bolts and other fixing bolts are loose, and ensure that the anti-static grounding is intact. 2. Check whether the protective covers are complete and securely fastened, and whether the electrical wiring is intact. 3. Check that all pressure gauges are in good condition and ensure they are in the operating position. 4. Check that the oil level is between 1/2 and 2/3; fill with wear-resistant lubricant if necessary. 5. Check whether the pressure in the liquid storage tank is normal. 6. Check the liquid level in the liquid storage tank.
1: Inspection 1. Check whether the foundation bolts and other fixing bolts are loose, and ensure that the anti-static grounding is in good condition. 2. Check whether the protective covers are complete and securely fastened, and whether the electrical wiring is intact. 3. Check that all pressure gauges are in good condition and ensure they are in the operating position. 4. Check that the oil level is between 1/2 and 2/3; fill with 46# wear-resistant lubricant if necessary. 5. Check the pressure in the liquid nitrogen storage tank; it should be between 0.02MPA and 0.8MPA. 6. Check the liquid level in the liquid nitrogen storage tank – it must not be below 0.4M, otherwise the pump will not be able to maintain a sufficient static head pressure. II: Pre-cooling 1. Open the inlet of the pump to allow the liquid to enter it. 2. Open the vent valve on the pump return pipeline to release the gas formed during pre-cooling; close the vent valve once liquid begins to spray out evenly, and then open the valve that leads from the return pipeline to the storage tank. 3. Wait for 5–10 minutes and observe until the liquid cylinder is evenly frosted, indicating that the pre-cooling process is complete. Step 3: Start the pump. 1. Open the pump’s outlet and check the flow path from the pump outlet to the vaporizer to ensure it is unobstructed. 2. Power on the pump and confirm that the motor’s electromagnetic speed control valve is in the zero position. 3. Start the pump and turn on the control switch for the motor’s electromagnetic speed control valve. Adjust the motor speed to 600RPM–1200RPM. 4. Observe the operation of the pump, checking for any abnormal noises and ensuring that the sound is normal.
(1) Is the lubricant level normal?； (2) Is the pump pre-cooling satisfactory? ； (3) Is the barring gear operating normally? ； (4) Is the white oil level normal? ； (5) Whether the valve is opened and closed correctly.
Before switching a cryopump, the items that need to be checked are: whether the lubricant level is normal; whether the pump has been properly pre-cooled; whether the pump rotates smoothly; and whether all valves are in the correct position.
(1) Is the lubricant level normal?； (2) Is the pump pre-cooling satisfactory? ； (3) Is the barring gear operating normally? ； (4) Is the white oil level normal? ； (5) Is the valve switched on correctly? ；
Answer: (1) Is the lubricating oil level normal?； (2) Is the pump pre-cooling satisfactory? ； (3) Is the barring gear operating normally? ； (4) Is the white oil level normal? ； (5) Is the valve switched on correctly? ；
This post was last edited by maysee on 2018-4-11 at 14:47. 1. Check that the foundation bolts and other fixing bolts are not loose, and that the anti-static grounding is in good condition. 2. Verify that the protective covers are present and securely fastened, as well as that the electrical wiring is in good condition. 3. Check that all pressure gauges are intact and positioned correctly for use. 4. Ensure that the oil level is between 1/2 and 2/3; fill it with 46# wear-resistant lubricant if necessary. 5. Check the pressure in the liquid nitrogen storage tank, which should be between 0.02MPA and 0.8MPA. 6. Check the liquid level in the liquid nitrogen storage tank – it must not be below 0.4M, otherwise the pump will not be able to maintain a sufficient static pressure.
1. Check whether the anchor bolts and other fixing bolts are loose, and ensure that the anti-static grounding is intact. 2. Check whether the protective covers are complete and securely fastened, and whether the electrical wiring is intact. 3. Check that all pressure gauges are in good condition and ensure they are in the operating position. 4. Check that the oil level is between 1/2 and 2/3; fill with 46# wear-resistant lubricant if necessary. 5. Check the pressure in the liquid nitrogen storage tank; it should be between 0.02MPA and 0.8MPA. 6. Check the liquid level in the liquid nitrogen storage tank – it must not be below 0.4M, otherwise the pump will not be able to maintain a sufficient static head pressure.