easy
Hot water pipe rust first as compared to the cold water pipe for the same chemical composition of the water.
Yes, as long as the water coming out of the pipe has a greater pressure than the water that is covering the pipe. If it is the other way around, the water covering the pipe will actually flow into the pipe. Think about it. It just makes sense.
Supply coming from water source is a water service line.
A water pipe.
To permanently cap off a water pipe, you can use a pipe cap or plug that fits securely over the end of the pipe. Make sure to clean and dry the pipe before attaching the cap to ensure a tight seal. Additionally, you can use epoxy or pipe sealant to further secure the cap in place.
something hitting the pipe, hot water pipe touching cold water pipe, or is it burping noise ? a tapping noise is sharp, do you live in an apartment ? is this a house, lot s of causes,
That's really not a factor . Different materials carried into your system are much more in play at corroding pipe. The only real answer is to fit an impervious pipe like PEX.
Cold water pipe.
Is there a leak in your home's water pipe?
Not with air! Run water in pipe at highest elevation of pipe and see that water drains at end of pipe system.
To effectively repair a copper water pipe, you can use a pipe cutter to remove the damaged section, clean the ends of the pipe, and then use a compression fitting or soldering technique to attach a new piece of pipe. Make sure to follow safety precautions and use the appropriate tools for the job.
make pipe