How do use piping?

I use piping for=1- gas lines==2- air lines==3- Medical gas==4- sewer==5- waste==6- soil==7- Storm==8- Sub soil drainage==9- domestic water supply hot ,cold and return circulation==10- Fire suppression piping==11- Hydronics=12- Steam Supply and return13- Condensate lines14- Acid waste systems=15- Making one shot firearms (Cannons)==16- copper bed posts (used with hand cuffs)=More uses but I cannot go into details