I tried using my water line with a pressure tank and pressure switch but without a pressure tank I observed that when he pressure reaches 30 psi the motor pump switches off automatically and when we open the faucets to use water the pressure switch turns on again the motor pump.
All that will do is cause your pump to burn out sooner. It will run WAY more often without a tank. The tank allows for a 'range' in your pressure, in other words, the pump will fill the tank to 30 psi, but will not kick on again until the tank gets below a certain level, say 20 psi, at which point it will pump it back to 30 and cut off again. Without a tank, the pump will run whenever you draw water.
rodolfo, no its not economical. a pressure tank is an integral part of a pressure system - think of it as a storage tank allowing you to use water at a preset pressure without running out instantly. a pressure tank will hold a certain amount of pressurized water to allow proper use -
A pressure tank acts to mellow out the surges inherent in the action of the pump. Without a pressure tank, the service life of the pump is diminished. Think of using a garden hose at full volume at the end of 50 feet of 1 pipe. That works out to 17 pounds of water moving at a high speed. When flow stops the 17 pounds of water has a tremendous amount of energy that has to go somewhere. It is better if that force goes into an air cushion at the top of pressure tank rather than into the vanes of the pump.
Never use a water well pump system without a pressure tank. The tank performs several functions - when it is in good operating condition. You want a specific amount of run time and off time on the submersible pump that will bring your water system and tank to a set pressure range. And as said, it is a buffer to eliminate surging. Plus permit a proper cycle time. Most standard water systems are set in a 20 pound differential. It is frequently set to pump at 30 PSI and shut off at 50 PSI or pump at 40 PSI and off at 60 PSI. 30 PSI is quite a low setting on the pressure switch Defective pressure tanks are very common and when they go bad, the risk of damage to the pump is at hand. There are very specific criteria to follow for a water well system. Too many variables to list here It would be best to have a reputable water well service person assist you. Pulling a defective submersible pump is not fun or inexpensive. Make a call - you will be glad you did in the long term.
