What are the causes of pump pumping out?
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⑴ The sealing oil has too low a density; it contains water； ⑵ Excessive sealing oil volume ； ⑶ The liquid level in the tower and container is too low ； ⑷ The packing gland is too loose, allowing cooling water to flow into the pump body ； ⑸ The medium temperature is too high, resulting in a high saturated vapor pressure and thus gas obstruction ； ⑹ The steam chamber at the pump inlet for cleaning is not properly sealed or there is a leak ； ⑺ There is air in the pump or non-condensable gases are present in the medium being pumped (air leakage at the inlet) ； ⑻ The inlet pipeline is blocked, the inlet valve is not open or is opened too slightly, or the valve core has fallen off.
Among them, I don’t understand what 1.2.3 means\ud83d\ude33
In the case of 3, it might be that the liquid level at the bottom of the tank is low, resulting in a smaller height difference between the liquid surface and the pump inlet; this in turn leads to a lower inlet pressure. When we pump out the bottom oil from our crude oil tanks, emptying occurs frequently. I’m wondering if reducing the opening of the outlet valve could prevent this emptying
If the evacuation is caused by too low inlet pressure, it is likely due to the net positive suction head; reducing the outlet valve has no effect.
It was taught by the master; a few more were found in books
The sealing oil has too low a density and contains water; this refers to high-temperature conditions in which the sealing oil vaporizes, or the water vaporizes
Well, on our high-temperature oil pumps, oil is used to flush the sealing chamber; when too much of the light components enter the pump body, the high-temperature medium causes the sealing oil to vaporize, which in turn leads to vacuum formation within the pump