Install on cold water line.
Yes, you will only have as much pressure as you do with the cold side, probably slightly less.
residual air pressure in the tank, and the pressure switch settings
An expansion tank is used in a water heating system to accommodate the expansion of water when it is heated, preventing pressure buildup and potential damage to the system. It should be installed on the hot side of the water heating system.
Installing a cold water pressure tank in a residential plumbing system can help maintain consistent water pressure, prevent pump cycling, and protect against damage to pipes and appliances.
Its a thermal expansion tank to absorb the pressure when the cold water heats in a hot water tank.
You will get warm instead of hot water. There is a tube inside the tank on the cold side that goes to the bottom of the tank and the hot comes directly from the top. Reverse them and you are going to get the cold water that settles to the bottom of the tank. It will not hurt the tank or anything, it just makes for poor hot water.
Not being able to see the pipe and not knowing where it is, it's kind of hard to know. If it is a cold water line and you have not shut off the hot water tank, the pressure from the hot water will back flow and hot water will come out of the cold side.
If water doesn't go into the pressure tank you will not have water pressure.
Which water tank, well water, cold storage or hot water heater tank.
The water pressure in a tank system is directly related to the tank air pressure. The tank air pressure helps regulate the water pressure and overall performance of the system. If the tank air pressure is too low, the water pressure may drop, affecting the system's efficiency. Conversely, if the tank air pressure is too high, it can cause the water pressure to be too high, potentially damaging the system. Maintaining the correct balance between water pressure and tank air pressure is crucial for optimal performance of the water pressure tank system.
if all the pipes in the house are the same size the easy answer is adjust the outflow valve on the hotwater tank until it matches the cold water pressure.
You probably haven't re-opened the cold water inlet valve.