【Learn Ethylene Together】Five questions per day to easily learn about ethylene 25

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【Learn Ethylene Together】Five questions per day to easily learn about ethylene. 25 24. The tubes in cracking furnaces are generally made of alloys. ( ) a. Austenite b. Martensite c. Bainite 25. The reasons for the automatic start-up of the feedwater pump are . ( ) a. Low level in the reheat unit; b. Air entering the system due to seal leakage, which prevents the pump from pumping fluid; c. Insufficient vacuum level in the reheat unit. 26. The reasons for cavitation in the reheat water pump include too low a level of reheat water, gas being carried into the pump, and an insufficient net positive suction head available for the pump. ( ) a. Excessively high condensate temperature b. Impeller rotating in reverse c. Low flow rate of the recirculation pump. 27. The reasons for a decrease in oil tank level include leaks in the oil cooler, a large pressure difference between oil and gas, and leaks in the sealing oil. ( ) a. The oil-gas separator is not functioning properly. b. The compressor load has increased. c. The liquid level in the shutdown tank is full. 28. The reason why the water pump for the first stage of pyrolysis gas cannot operate properly is ( ) a. Sealing leakage. b. Oil present in the water. c. High pressure in the water washing tower. 24. The furnace tubes in pyrolysis furnaces are generally made of alloy. ( ) a. Austenite b. Martensite c. Bainite 25. The reasons for the automatic start-up of a booster pump are . (b) a. Low liquid level in the rewatering unit; b. Air entering the system due to seal leakage, which prevents the pump from pumping fluid; c. Insufficient vacuum level in the rewatering unit. 26. The reasons for cavitation in the rewatering pump include too low a liquid level in the rewatering unit, gas being carried into the pump, and an insufficient net positive suction head available for the pump. (a) a. Excessively high condensate temperature; b. Impeller rotating in the reverse direction; c. Low flow rate of the recirculation pump. 27. Reasons for a decrease in oil tank level include leaks in the oil cooler, a large pressure difference between oil and gas, and leaks in the sealing oil. (a) a. The oil-gas separator is not functioning properly. b. The compressor load has increased. c. The liquid level in the shutdown tank is full. 28. Reasons why the water pump for the first stage of pyrolysis gas cannot operate: (b) a. Seal leakage. b. Oil present in the water. c. High pressure in the water washing tower