Pull Back

That part of a guided boring or directional drilling operation in which the drill string is pulled back through the bore to the entry pit or surface rig, usually installing the product pipe at the same time.

Pull Back Force

The tensile load applied to a drill string during the pull back process. Guided boring and directional drilling rigs are generally rated by their maximum pull-back force.

Pull-In Piping

Also referred to as insert renewal; installation procedure whereby pipe is pulled inside old mains and service lines to provide the new main or service line.