Buoyancy

The power of supporting a floating body, including the tendency to float an empty pipe (by exterior hydraulic pressure).

Buried Objects

Items in the ground that can affect MTBM advancement  and line and grade control. Buried objects that prevent continued advancement along the design path, which includes tolerances, are called obstructions.

Burst Strength

The internal pressure required to cause a pipe or fitting to fail within a specified time period.

Butt Fusion

A method of joining polyethylene pipe where two pipe ends and rapidly brought together under pressure to form a homogeneous bond.