Encyclopedia
Corrugation
Goifr - a deviation from the pipe's cross-sectional shape caused by loss of local stability of the pipe wall, occurring when excessive plastic deformations develop in the compressed zone during pipeline bending
Source: "Instruction on Assessing Defects in Pipes and Connecting Parts During Repair and Diagnostics of Main Gas Pipelines (with Amendment No. 1)"
(approved and introduced into force by OAO "Gazprom" November 18, 2008)