Tubulars - Drill Pipe Classification

Drill Pipe Classification


Drill pipe class defines the physical condition of the drill pipe in terms of
dimension, surface damage, and corrosion. Drill pipe class is indicated by
paint bands on the drill pipe according to the following code:

Class 1 drill pipe is New and therefore the strongest. As pipe is used, the
wall thickness will be gradually reduced. This reduction of the drill pipe
cross sectional area results in a lower Total Yield Strength in pounds. This
yield strength in pounds can be calculated using the following formula:
YIELD STRENGTH = Yield Strength x p/4 (OD2 - ID2)
(in pounds)(in psi)