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TEST PROCEDURE FOR ANALYSIS OF PIPELINE RUPTURE (cont) <br />f. Cut 5 - Saw cut through crack 1" from the tip at the South <br />end. This will separate the cracked Surfaces. <br />7. Examine the exposed cracked surfaces to determine the possible <br />initiation points. <br />8. Prepare acetate or rubber replicas of the cracked surface concentra- <br />ting on possible crack initiation points. <br />9. Cut mating pie - shaped sections at the suspect crack origin or <br />initiation point. <br />a. Evaluate the cracked surfaces using a scanning electron <br />microscope (tentatively scheduled for July 15, 1986, at <br />12:30 pm). <br />b. Epoxy the mating surfaces together for metallographic evaluation. <br />i0. Remove the following additional test specimens: <br />a. Cut 6 - saw cut 13" from cold cut end on the side opposite <br />the crack. <br />b. Remove two tensiles from this section 90° from the weld <br />seam. <br />c. Cuts 7 and 8 - saw cut two additional 6" lengths from the <br />non -fractured portion of the pipeline and subject these <br />sections to flattening and reverse flattening tests. <br />d. Conduct macroetch and micro examination on the weld seam <br />of the removed section identified as 6C. <br />e. Remove Charpies (tentative) with the weld seam located in <br />the notch. <br />The testing will be conducted under the direction of Jim Wildey, metallur- <br />gist representing NTSB. He will be arriving at approximately 10:45 <br />am on Monday, July 14, 1986. We have made arrangements to pick up Mr <br />Wildey at the airport and transport him to our laboratory. <br />e.tuAn city too" <br />