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

# and COLOR of BANDS

1 (New)

One White

Premium

Two White

2

One Yellow

3

One Orange

4

One Green

Scrap

One Red

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)

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