Yes, it is recommended that backflow preventers be used. Some areas may also have laws ensuring their placement on systems.
An expansion tank is recommended for water heaters to help regulate pressure and prevent damage to the system. It is especially important for closed-loop systems or when the water heater is connected to a backflow preventer.
Area water authority could have increased water main pressure, no or defective expansion tank in house main water line if house has a backflow preventer installed, or defective /not properly set pressure reducing valve.
I believe that the larger the hot water tank, the greater is the need for an expansion tank. Water expands as it is heated. This is why all hydronic heating systems require an expansion tank. A water heater would need expansion tank when a backflow preventer or check valve is installed in domestic cold water line directly after water meter. Some areas require backflow prevention, but not all. Have to check with local plumbing authority about that.
No the particles are probably sand or metal. This could indicate a failed backflow preventer or failed pickup screen A failing bladder would be loosing pressure and cause the pump to run constantly.
You must have a pressure relief valve. I believe it is code nationally. I don't think you can buy a hot water tank w/o one. Expansion tank needed also if water meter has backflow preventer, check with local water authority if it does.
i had the same issue some time back on a 98 Road King Classic. Ended up being the back flow preventer between the fuel line and the tank. i fixed my by removing the fuel line on the left side of the tank. this is very easy. move the hose out of the way. now the fun part. the back flow preventer screws into the tank. it can be accessed after the fuel line has been removed as described above. the leak could be coming from the seal on the backflow preventer or it may just need to be tightened. there is a special tool that can be purchased from harley but i made a tool by taking wood chisel and grinding the edges down to fit the slot in the backflow preventer (bp). be very careful not to compromise the threads for the fuel line. i took the bp out, put a new seal and then used some thread sealer. tighten the bp up, reinstall the fuel line and hope for the best. hope this helps. greg
If water doesn't go into the pressure tank you will not have water pressure.
No you don't need a tank to simply pump water from a lake. You would only need a tank if your using a pressure switch to turn the pump on and off.
To install a water pump with a pressure tank, follow these steps: Choose a suitable location for the pump and tank near the water source. Connect the pump to the water source using appropriate piping. Install a check valve to prevent backflow. Connect the pressure tank to the pump using a pressure switch and pressure gauge. Adjust the pressure settings on the pressure switch according to your needs. Test the system to ensure proper functioning. It is recommended to consult a professional if you are unsure about any step in the installation process.
If you are on a well.
if its a bladder type tank, it will need to be replaced
This is done at the pressure tank. First drain the tank with pump off, then check air pressure at the tank top nipple. It should be above 26 psi. If not this is your problem. You may need a new tank or it it's a 'galvanised ' tank , a new air charge. You may also need the pressure switch adjusted, or even a new one. -Call a well technician for an expert opinion and repair.This is done at the pressure tank. First drain the tank with pump off, then check air pressure at the tank top nipple. It should be above 26 psi. If not this is your problem. You may need a new tank or it it's a 'galvanised ' tank , a new air charge. You may also need the pressure switch adjusted,or even a new one.-Call a well technician.