My pump system for boosting city pressure ( pump , pressure tank , pressure switch ) is now working fine after I fixed a pressure regulator at the house entrance
However my pump dead head pressure is 58psi ( that is the pressure it can generate when the city pressure is zero ( theoritically) i.e water is just at the pump entrance .
Most of the time the city pressure is in the range of 20 to 28 psi so I would set the pressure switch to 50/75 psi but in very few times the pressure drops dramatically and so far I have been lucky to find out that and switch off the pump before it burns out
Of couse I know that - to be in the safe side - I should set the pressure switch cut out pressure to not nore than 58 or slightly less , but it is a real petty not to be able to make full use of the available value of the city pressure which is a reasonable value most of the time
The question now is , if I fixed a flow switch before the pump in the upstream side would it switch the pump off not only at the full dry running condition but also if the down stream side pressure remained constant for some time while the pump is running but can not achieve the cut out pressure setting of the pressure switch ?
i.e If the cut out pressure is 75psi but the pump can not achieve more than 70 or 65 psi , would the flow switch sense that the water in the upstream is stagnant and practically NO flow is happening then it switches off the pump?
If the answer is NO , is there any other way to protect the pump at these 50/75 settings in stead of having to reduce down the pressure switch settings to say 35/55 psi?
In advance , I appreciate very much your help .
However my pump dead head pressure is 58psi ( that is the pressure it can generate when the city pressure is zero ( theoritically) i.e water is just at the pump entrance .
Most of the time the city pressure is in the range of 20 to 28 psi so I would set the pressure switch to 50/75 psi but in very few times the pressure drops dramatically and so far I have been lucky to find out that and switch off the pump before it burns out
Of couse I know that - to be in the safe side - I should set the pressure switch cut out pressure to not nore than 58 or slightly less , but it is a real petty not to be able to make full use of the available value of the city pressure which is a reasonable value most of the time
The question now is , if I fixed a flow switch before the pump in the upstream side would it switch the pump off not only at the full dry running condition but also if the down stream side pressure remained constant for some time while the pump is running but can not achieve the cut out pressure setting of the pressure switch ?
i.e If the cut out pressure is 75psi but the pump can not achieve more than 70 or 65 psi , would the flow switch sense that the water in the upstream is stagnant and practically NO flow is happening then it switches off the pump?
If the answer is NO , is there any other way to protect the pump at these 50/75 settings in stead of having to reduce down the pressure switch settings to say 35/55 psi?
In advance , I appreciate very much your help .