Underground Piping

Dear All Specialists,

1. What are the criterias, which determine the depth of the underground pipe ?
2. What should be considered in the selection of soil for the underground pipe trench ?
3. Should there be any joint under the crossing road ? If yes, what will be the suitable joints ?

Thanks

[Non-text portions of this message have been removed] Received on Wed Jun 02 01:40:00 2004