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Not sure of your current situation, sounds like you now have a new tank and the only problem is that the pump pressure is not where you would like it?? If the pump is surging on and off your tank is probably water logged. This causes the system pressure to build up almost immediately to the pump cut off pressure. As soon as the pump cuts off the system pressure drops and the pump starts again. You can also have another problem with the pump cycling rapidly if the pressure switch is too far from the tank and the supply line to the tank is small. In this case the pressure at the switch builds up faster than it does at the tank, the switch thinks the tank is full and shuts off the pump. As the pump shuts off the pressure drops and the pump starts again. I had this problem on my boat which had a large pump with the pressure switch at the pump and the pressure tank about 15 feet away. The pump was too large for the size line to the tank. You can adjust the pressure switch to cut in and out where you want it to provided that the pump is capable of the desired pressure. Your empty tank pressure should be a couple of pounds less than the pump cut on pressure or the pump will never start. If you have a tank with no bladder it will work the same as one with a bladder if you put the proper pressure in it with the tank empty of water. If you get too much air pressure in a tank without a bladder it will adjust itself after a few pump cycles. If the pressure is too high the tank will run out of water and push out some of the air to the faucets before the pump starts. If the air pressure is right the pump will start just before the tank runs out of water and no air will escape. That is why the air pressure should be set just below the cut in pressure of the pump. A tank with no bladder in it will eventually become water logged over a period of time. The water will absorb the air slowly. About once a year or so you have to drain the water completely and repressurize the tank with air. Of course if the schrader valve is leaking it will fill up with water in a short time. You could also add air once in awhile without draining the tank and let it self adjust as above provided it is not too waterlogged before you add air. A tank that originally had a bladder and the bladder breaks can still be used the same as a tank without a bladder. No need to throw it away. Just pressurize it as explained above and go on your merry way! :>)
You will now of course have to service it every year or so where as the tank with a good bladder should be mostly trouble free.
The only difference with the bladder is that the water does not absorb the air over a period of time so you do not need to attend to it as often. Regards
Gary
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