(1) In many instances, a term interchangeable with pipe. (2) In the boring industry, it is usually used for small plastic or steel pipes that enclose wires or cables for electrical or communication usage. (3) ConduitA broad term that can include pipe, casing, tunnels, ducts or channels. The term is so broad that it should not be used as a technical term in boring or tunneling. inside which a utility service is installed.
Dry Weather Flow(1) Turns drilling fluid flow on. (2) Turns air on.; is the base flow in a sewer prior to rain induced flows.
Dry Weather InflowWater discharged into a sewer system and service connections from sources on the surface.; is the result of flow entering the collection system from connected sources which are not caused by rainfall. Typically, this could include water from fire fighting, hydrant abuse, street washing, sump pumps etc.
The use of a tool that comprises a percussive hammer within a suitable, generally torpedo-shaped casing. The hammer may be pneumatic or hydraulic. The term is usually associated with nonsteered devices.
Type of microtunneling or tunneling machine in which mechanical pressure is applied to the material at the face and controlled to provide the correct counter-balance to earth pressures in order to prevent heave or subsidence. The term is usually not applied to those machines where the pressure originates from the main Pipe JackingA system of using hydraulic jacking from a drive shaft to directly install pipes behind a shield machine so that they form a continuous string in the ground. rig in the Drive ShaftSee Jacking Shaft./Pit or to systems in which the primary counter-balance of earth pressures is supplied by pressurized drilling fluid.