Pascal’s Law

PressureChanges the drilling fluid pressure. exerted at any point upon a confined liquid is transmitted undiminished in all directions.

Pavement, Invert

Lower segment of a corrugated metal pipe provided with a smooth bituminous material that completely fills the corrugations, intended to give resistance to scour, erosion, and to improve flow.

PE

PolyethyleneA ductile, durable, virtually inert thermoplastic composed by polymers of ethylene. It is normally a translucent, tough solid. In pipe grade resins, ethylene-hexene copolymers are usually specified with carbon black pigment for weatherability.; a form of thermoplastic pipe.

Penetration Rate

Instantaneous excavation distance per time while the MTBM is operating, typically measured in inches per minute or millimeters per minute.

Percent (%)

A dimensionless number with the ratio of one (1) to one hundred (100). In the construction industry, it is mostly used to give the rise of fall of a pipe line, or road, in feet per 100 feet (i.e., a one (1) foot rise in one hundred (100) feet would be a plus 1% (one percent) grade).