API Specification 5L, Supplemental Requirement SR5, 37th Edition, requires that Charpy V-notch (CVN) impact properties of pipe from which full size (0.394 x 0.394 inch) transverse specimens cannot be obtained, because of wall-thickness/pipe-diameter limitations, be measured with unflattened 2/3 size (0.263 x 0.394 inch) or l/2-size (0.195 x 0.394) transverse specimens. Since the use of subsize specimens is known to introduce significant problems in measuring transition temperature interest has been expressed in the possibility of measuring CVN impact properties with flattened specimens to...
API Specification 5L, Supplemental Requirement SR5, 37th Edition, requires that Charpy V-notch (CVN) impact properties of pipe from which full size (0.394 x 0.394 inch) transverse specimens cannot be obtained, because of wall-thickness/pipe-diameter limitations, be measured with unflattened 2/3 size (0.263 x 0.394 inch) or l/2-size (0.195 x 0.394) transverse specimens. Since the use of subsize specimens is known to introduce significant problems in measuring transition temperature interest has been expressed in the possibility of measuring CVN impact properties with flattened specimens to maximize specimen thickness, i.e., use full wall thickness, when subsize specimens are necessary. The present study was undertaken to examine the merit of this approach.
This work was done under the NG-18 workgroup, report 182.