Pressure

Changes the drilling fluid pressure.

Pressure Rating

Estimated maximum internal pressure that allows a high degree of certainty that failure of the pipe will not occur.

Pressurized

To pump or force a liquid at a higher rate than that achievable under normal open channel or free surface conditions.

Preventative

Routine maintenance designed to prevent sewer system maintenance problems.

Primary Pipe

The basic conduit when used in conjunction with a “protective liner”; when inspected and evaluated it is the basic or primary pipe which must meet the fit-for-use criteria. When a sewer section is upgraded with a structural, monolithic liner, the liner becomes the primary pipe; subsequent inspection and evaluation is then performed with respect to that liner.