Definition(s)
Diameter Tape
Measuring device consisting of a thin, flexible, metallic tape which can be wrapped around the circumference of a length of OCTG and is graduated such that average diameter can be directly read from the scale. A diameter tape is also referred to as a pi tape direct current refers to an electric current flowing continually in one direction only through a conductor.
Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards