Why is the suction line bigger than the discharge line?

When you see a larger suction line, it is because suction is less efficient than pushing a liquid through a line. If your pump can’t suck enough water into the pump, it will cavitate and often destroy the blades of the pump with cavitation.

What happens in a centrifugal pump when the pipe diameter of an inlet is lesser than the pipe diameter of an outlet?

Double the pipe diameter reduces the flow rate. This is because in the inlet side of the impeller we do not want the pressure to drop below the vapor pressure of the fluid which is being pumped. If it happens then cavitation will take place and pump will be damaged.

Is the suction line smaller than the discharge line?

Its not the same volume in the discharge line compared to the suction as it is compressed hence it has a smaller volume but the same mass.

Why is the liquid line smaller than the suction line?

Because liquid refrigerant is much denser than vapor, the liquid line contains a relatively large amount of refrigerant compared to the much larger vapor line. That is why we see a big variation in suction line size but very little change in liquid line size in residential applications.

Is the discharge line high or low pressure?

The high side, or discharge line, will be the line connected to the compressor from the bottom or lower position. It will not be wrapped in insulation and will be warm to the touch. This is where freon exits the compressor as a liquid.

What is the purpose of the discharge line?

The discharge thermostat is a safety device that turns off power when the compressor discharge temperature reaches a certain level. The clip-on type has a manual reset. The discharge thermostat can be reset by depressing the red button if power is turned off.

What is pump discharge?

Discharge Head: This is the vertical distance that you are able to pump liquid. For example, if your pump is rated for a maximum head of 18 feet, this does not mean that you are restricted to 18 feet of pipe. Suction Lift: This is the vertical distance that the pump can be above the liquid source.