Force Main

A pipeline that conveys sanitary, combined or stormwater flow under pressure from a pumping (or lift) station to a discharge point.

Forward Rotation

The clockwise rotation of the auger as viewed from the machine end.

Fouling

An accumulation of deposits. This term includes accumulation and growth of marine organisms on a submerged metal surface and also includes the accumulation of deposits (usually inorganic) on heat exchanger tubing.

Foundation Drain

A pipe or series of pipes which collect groundwater from the foundation or footing of structures and discharge it into sanitary, storm, or combined sewers, or to other points of disposal for the purpose of draining unwanted waters away from such structures.

Frac-Out

See Inadvertent ReturnThe loss of drilling fluid, including slurry and lubrication, from the slurry or lubrication system. A special form of inadvertent return, where the fluid exceeds the strength and confining pressure of the ground and reaches the surface or waterway, is called a hydrofracture or frac-out. and HydrofractureA special form of inadvertent return in which drilling fluid reaches the surface or waterway. Also called a frac-out..