The theoretical area between the gauge cut and the pipe OD equal to (? x (Gauge CutThe outermost projection of the excavation, measured as a diameter. The gauge cut is subject to cutter wear and to the differential cut. OD2 – PipeA long tube of clay, concrete, steel, metal, wood, etc., for conveying water, gas, oil or other materials. OD2)/4). It is the combined area created by the overcut and the shield cut.
The electrode at which oxidation or corrosion occurs; opposite of cathode.
American National Standards Institute, Inc.
A value of tensile strength used for comparative purpose that is determined by tensile testing pipe rings in accordance with ASTMAmerican Society of Testing and Materials; technical organization formed for the development of standards on characteristics and performance of materials, products, systems and services, and the promotion of related knowledge. 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.
The apparent tensile strength calculated for the yield condition.