Some problems with liquid hydrocarbon pumps
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This post was last edited by lxzzl on 2009-5-27 16:06 (1) Liquid hydrocarbons tend to vaporize inside the pump; how can gas-liquid separation be ensured? (2) Why is it necessary to consider the power consumption during trial operation when matching a motor to a liquid hydrocarbon pump? Thank you for the answer!
“The phrase “Liquefied hydrocarbons vaporize easily inside the pump; how can gas-liquid separation be ensured?” is a bit inappropriate. It should be \"Liquefied hydrocarbons vaporize easily inside the pump; how can vaporization be prevented?\" ”
1. Control the process parameters properly. 2. Pay attention to the net positive suction head during installation
During operation, be careful not to let the pressure drop; if the flow rate is too low, pay attention to keeping the pump’s temperature from rising too high.
Reply to 3# zhangya*ong: What is the net positive suction head available for liquefied petroleum gas pumps, in meters?
First: Liquid hydrocarbons have high saturated vapor pressures, making them easy to vaporize; there is no need for gas-liquid separation, otherwise the pump would become evacuated. Second: I speculate that when testing a liquid hydrocarbon pump individually using water, overcurrent can occur, so the power consumption during testing must be taken into account
Increase the device’s net positive suction head! Methods: 1. Directly increase the backflow height. 2. Enlarge the diameter of the inlet pipe. 3. Reduce the use of elbows. 4. Open the inlet pipe valve to full capacity. 5. Lower the pump’s installation height; digging a pit in the ground can be considered!
Reply 1# xuxuab: Check out http://bbs.hcbbs.com/viewthread.php?tid=747744&rpid=4299109&ordertype=0&page=1#pid4299109
I. Liquefied hydrocarbons are prone to vaporization; in order to ensure the proper operation of the pump, 1. select a pump with a relatively low NPSHr value； 2. Insulate the inlet pipeline ； 3. Increasing the inlet pressure – if the fluid comes from a tank, using a pressurized tank or increasing the pressure inside the tank is an effective way to raise the inlet NPSH value and prevent cavitation. As for the second point, I’m not clear about what the original poster means; when we calculate the motor power, there is no such thing as power consumption