Annulus

The theoretical area between the gauge cut and the pipe OD equal to (? x (Gauge Cut OD2 – Pipe OD2)/4). It is the combined area created by the overcut and the shield cut.

Anode

The electrode at which oxidation or corrosion occurs; opposite of cathode.

ANSI

American National Standards Institute, Inc.

Apparent Tensile Strength

A value of tensile strength used for comparative purpose that is determined by tensile testing pipe rings in accordance with ASTM D 2290. This differs from true tensile strength of the material due to a bending moment induced by the change in contour of the ring as it is tested. Apparent tensile strength may be at yield, rupture or both.