Does anyone know;

1) Installed prices for gate or butterfly valves for;
4",6",8",10",12",14",16",18",20",24",30",36" pipes.

2) Installed fire hydrant prices; complete with stub out vale, piping, the works.

3) And laying lengths of DI pipes, for the above sizes.

4) Formula for probability of pipe failures in terms of diameter and length
of pipe.

Thanks,
Istvan