A metal which used to be used for piping but is still no longer used because of the risk of poisoning the warter supply?
The metal you are referring to is called lead. The ancient Romans used to use lead for their piping. In fact, the Emperor Nero may have "fiddled while Rome burned" because had lead poisoning, which affects mental function.
Lead
The Romans used a piping system called an aqueduct to supply their cities with water.
On supply it lowers the velocity.... On drainage it increases the fixture units the piping can carry
The Roman had problems with lead poisoning because they made lead pipes for water supply.
Supply lines have a number of uses, but in plumbing it's mostly used to clean out piping as a cheaper alternative to snaking.
PEX Supply in your area can tell you about PEX piping in Columbus. They should be able to assist you with materials that you may need and training on how to use them.
Because it is no longer connected to the power supply.
calculating the size of the piping by figuring out the fixture units and gpm and pressure demands with friction loss
Yes, because over time, demand decreases.
By developed length of piping and fittings for venting and fixture units connected to it for water supply or drainage
That is like asking which plane is the best are you talking crop dusting or jet fighter or passenger ?=Is the piping for domestic water supply is the piping for steam applications and if so what medium and pressure?==Are we talking about acid waste systems or storm drainage or soil and waste lines or venting? Commerical or residencial PH factor of the water supply=RED BRASS piping schedule 40 with TP Fittings is great for water, steam ,hydronics,waste and soil lines, venting and under the right conditions can last well over 600 years no problem
No unless it goes untreated and becomes badly infected poisoning your blood supply