Is the pressure at the pump outlet exactly negative?
Thread Content
The unit has a reciprocating pump. There is a pressure gauge at the outlet of the pump. The pointer is at zero. The director suspected that the gauge was damaged and asked me to replace it. I replaced this part with two new pressure gauges, but the pointers didn't respond. I went back and reported it to the leader. The leader thought for a while and said: The rear path is under negative pressure, so it is not displayed. The pressure here should be negative pressure. The pressure gauge range is 0￣1.6MPa. The pump outlet is about 40 meters away from the negative pressure system. The pump outlet is equipped with a safety valve. I think there should be positive pressure here. What do you guys think?
If it is negative pressure, how does the liquid flow?
I think it should be positive pressure. Just like the brother above said, if it is negative pressure, how should the liquid flow?
The pump outlet is connected to the negative pressure system, which can keep the meter needle from moving.
It should be that the pressure guide pipe of the pressure gauge is blocked. The pressure gauge at the outlet of the pump shows absolute pressure. There is no such thing as negative pressure. Negative pressure refers to gauge pressure. In addition, for ordinary pumps, there are few pump outlets with lower than 0.1MPa (that is, atmospheric pressure), and it is impossible to have negative pressure.
The pump outlet cannot be under negative pressure and should be checked.
The outlet of the pump should not be at negative pressure. If it is negative pressure, how can the liquid be transported?
Agree with the 5th floor. Even if a negative pressure system is connected to the rear, there should be an indication on the pressure gauge and it should be positive pressure.
The concepts of gauge pressure and absolute pressure. . .
The pump outlet should be at positive pressure. If the material pumped out by the pump has no effect, you should check whether the pipe on the pressure gauge is blocked.
Gauge pressure = absolute pressure - atmospheric pressure (the reading measured directly by the pressure gauge). Vacuum degree = atmospheric pressure - absolute pressure (the reading directly measured by the vacuum gauge). As for whether the place is lower than the standard atmospheric pressure, let me try to calculate it using the Bernoulli equation.