Bob NH
In the Trades
It will be difficult to find a simple pump, tank, and pressure switch setup that will operate consistently over the range of inlet conditions that you are experiencing. Water supply (amount of water) and pressure are absolutely linked. The supply may be in the main but it can't be extracted through the 1" pipe because there is not enough pressure in the main.
You can extract more but not enough water from the pipe by reducing the pressure at the outlet end with a pump. However, that pump cannot then deliver the pressure required to shut off the pressure switch.
The cistern provides a stable condition that can be the basis for selecting a pump, pressure tank, and pressure switch system. The cistern pressure is always atmospheric pressure and there is always a supply, up to the limits of the cistern and the ability of the service to keep it full at low flow rates.
1. Decide what pressure range you want.
2. Decide what GPM you want for steady state (long shower) conditions.
3. Determine total gallons for peak 10 minute period and peak 1 hour period.
4. Determine what supply flow will be used for the system.
That will be the design point for selection of the pump, cistern, pressure tank, and pressure switch settings to deliver what you want.
A shallow well jet pump will also deliver much more flow at lower pressures if demanded. The only limit will be the storage in the cistern and the delivery rate from the utility.
You can extract more but not enough water from the pipe by reducing the pressure at the outlet end with a pump. However, that pump cannot then deliver the pressure required to shut off the pressure switch.
The cistern provides a stable condition that can be the basis for selecting a pump, pressure tank, and pressure switch system. The cistern pressure is always atmospheric pressure and there is always a supply, up to the limits of the cistern and the ability of the service to keep it full at low flow rates.
1. Decide what pressure range you want.
2. Decide what GPM you want for steady state (long shower) conditions.
3. Determine total gallons for peak 10 minute period and peak 1 hour period.
4. Determine what supply flow will be used for the system.
That will be the design point for selection of the pump, cistern, pressure tank, and pressure switch settings to deliver what you want.
A shallow well jet pump will also deliver much more flow at lower pressures if demanded. The only limit will be the storage in the cistern and the delivery rate from the utility.