Some questions related to storage and transportation

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1. What is the function of the liquefied gas pump seal oil storage tank? Answer: The seal oil tank is connected to the double-end mechanical seal chamber of the pump; the seal oil introduced serves to cool, lubricate, and seal. When the mechanical seal is damaged and leaks, liquefied gas enters the seal oil tank, causing the pressure in that tank to rise; this indicates a leak in the mechanical seal. It is necessary to switch to the backup pump promptly to prevent accidents caused by the leaking liquefied gas. 2. What are the methods to deal with pipeline icing and blockage of drainage pipes during liquefied gas dehydration? (1) Close the tank base valve. (2) Use circulating water to slowly thaw the area around the tank base valve from the drain outlet. (3) Steam purging is strictly prohibited. (4) Prevent sudden release of liquefied gas during operation. 3. What is the working principle and flow path of the natural gas inlet flow meter? Sound waves propagate through fluids; their speed increases in the direction of flow and decreases in the opposite direction. For the same distance traveled, different propagation times occur. The average flow velocity is determined by utilizing the relationship between this difference in propagation speeds and the flow velocity of the fluid being measured. Process flow: (1) Go to the hydrogen production unit; (2) Enter the fuel gas pipeline network after pressure reduction to balance the pressure. (3) Go to the cafeteria 4. What is the method for replacing spherical tanks? (1) Open the vent valve on the top of the tank, fill water in from the water inlet line at the bottom of the tank, and allow air to escape from the top. Stop filling water once water begins to flow out of the vent valve at the top. (2) Close the vent valve on the top of the tank, open the nitrogen valve on the top of the tank, and open the dehydration valve at the bottom of the tank to drain all the water; keep the pressure gauge showing a slight positive pressure, then close the dehydration valve. (3) Collect nitrogen at 0.1 MPA, and vent from the top of the tank. Repeat 3–4 times. (4) Samples are taken from the top and bottom of the tank respectively; the analysis is considered successful when the oxygen content is less than 0.5%. (5) Maintain a slight positive pressure inside the tank. 5. What are the reasons for black smoke when a torch is burning, and what are the solutions? Reason: 1. The device emits a large amount of oil and gas, with insufficient air supply, resulting in incomplete combustion. 2. The vent gas contains a high proportion of heavy components. Solution: 1. Adjust the atomized steam to ensure more thorough mixing of oil and gas, resulting in complete combustion. 2. The control room has requested that the facility reduce its emissions. 3. After the black smoke is eliminated, adjust the steam promptly to protect the torch tip while also saving steam. 6. What aspects should be checked during the normal operation of a centrifugal pump? 1) Check that the current does not exceed the rated value. 2) Check whether the pump’s outlet pressure and flow rate are normal. 3) Check whether the pump body and motor operate smoothly, with no abnormal noises. 4) Check the temperature of the bearings in the motor and pump. The temperature of the motor bearings should not exceed 75°C, and the temperature of the pump bearings should not exceed 70°C. 5) Check the lubrication system to ensure an adequate amount of lubricant is available. (1/2–2/3) 6) Check for leaks in the mechanical seal; if the leakage exceeds the allowable limit (5–6 drops per minute), the pump should be stopped for inspection. 7. What are the functions and purposes of oil blending? Answer: The oil must possess the properties required for use, ensuring qualified and stable quality ； Improve the performance of oil products, raise the quality level of products, and enhance the economic and social benefits for enterprises. Make full use of raw materials, apply components rationally, increase the variety and quantity of products to meet market demands. 8. Why isn’t an automatic dehydrator installed on the benzene tank? For highly toxic substances and gases containing corrosive substances, separate emission systems should be installed. Benzene is classified as Category I (extremely hazardous), and due to the uncertainty in the operation of automatic dehumidifiers, poor dehumidification results may occur; therefore, automatic dehumidifiers are not used. 9. When the unit is started up, how is the sealing oil for normal pressure and catalytic start-up supplied to the unit? When the unit is started up, atmospheric-pressure, catalytically processed diesel is transferred back to the unit from the finished product tank area via the diesel inlet line. Catalytic start-up gasoline is returned to the unit via the gasoline inlet line from the gasoline tank farm. 10. What are the operating steps for diesel additives? (1) Calculate the amount of additive based on the dosage specified in the scheduling notice. (2) The additive is diluted with diesel, at a dilution ratio of not less than 5:1. (3) The order of addition is to first add diesel and then the additive for dilution. (4) The mother liquor is added to the finished product tank via a dosing pump. (5) After adding the admixture, carry out mixing cycles; after 2 hours of settling, dehydrate it and send it to the laboratory for analysis. (6) Keep proper records of admixture mixing