2017-6-6 Purification Technology Edition Daily Question
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What are the causes of cavitation in feedwater pumps? Answer: The reasons for cavitation in the feed water pump are: ① A decrease in pressure inside the deaerator. ② The water level in the deaeration tank is too low. ③ The feed water pump operates for extended periods at low flow rates or under no-load conditions. ④ If the feed pump recirculation valve closes accidentally or is opened too slightly, the feed pump will operate in a sealed condition. Note: Answers to this question are valid within 3 days! ! !
1) Decrease in pressure inside the deaerator； 2) The water level in the deaeration tank is too low ； 3) The feed water pump operates for extended periods at low flow rates or under no-load conditions ； 4) The feed pump recirculation valve closes accidentally or is opened too slightly, causing the feed pump to operate in a sealed condition.
The inlet water level is too low, with low flow rate for extended periods or idling
1. Excessive resistance in the inlet piping or overly small pipes. 2. Excessively high temperature of the medium being transported； 3. The flow rate is too high, that is, the outlet valve is opened too wide ； 4. The installation height is too high, affecting the pump’s suction capacity ； 5. Selection issues, including the selection of the pump and the material used for the pump, etc
1) Decrease in pressure inside the deaerator； 2) The water level in the deaeration tank is too low ； 3) The feed water pump operates for extended periods at low flow rates or under no-load conditions ； 4) The feed pump recirculation valve closes accidentally or is opened too slightly, causing the feed pump to operate in a sealed condition.
① The pressure inside the deaerator decreases. ② The water level in the deaeration tank is too low. ③ The feed water pump operates for extended periods at low flow rates or under no-load conditions. ④ The recirculation valve of the feed water pump is closed incorrectly or is set too low, causing the feed water pump to operate in a sealed condition
1) Decrease in pressure inside the deaerator； 2) The water level in the deaeration tank is too low ； 3) The feed water pump operates for extended periods at low flow rates or under no-load conditions ； 4) The feed pump recirculation valve closes accidentally or is opened too slightly, causing the feed pump to operate in a sealed condition.
⑴ The pressure inside the deaerator decreases. ⑵ The water level in the deaerator tank is too low. ⑶ The feed water pump operates for extended periods at low flow rates or under no-load conditions. ⑷ If the feed pump recirculation valve closes accidentally or is opened too slightly, the feed pump will operate in a sealed condition.
(1) The temperature of the liquid being transported is too high. (2) The allowable net positive suction head is insufficient, and the installation height is inadequate. (3) The density of the liquid being transported has decreased. (4) The opening degree of the outlet valve is too large
Answer: The reasons for cavitation in the feed water pump are: ① A decrease in pressure inside the deaerator. ② The water level in the deaeration tank is too low. ③ The feed water pump operates for extended periods at low flow rates or under no-load conditions. ④ If the feed pump recirculation valve closes accidentally or is opened too slightly, the feed pump will operate in a sealed condition.