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TEST PROCEDURE FOR ANALYSIS OF PIPELINE RUPTUkE <br />1. Preserve the surfaces of the crack (rupture) by cleaning with a <br />WD40 solution or the equivalent. Then, spray these surfaces with <br />blueprint dye. <br />2. Transpnrt the pipeline section to Twin City Testing Corporation <br />for storage and testing. <br />3. Radiograph the intact longitudinal weld in its entirety either <br />before or after field cold cutting the sectio,; 12" from the north <br />end of the crack. <br />4. Dimensional measurements <br />a. Take diameter measurements at 4' intervals along the failed <br />section of the pipeline at 3:00 - 9:00 and 6:00 - 12:00 <br />positions. Identify all the locations reading from south <br />to north as the pipe was positioned in the ground. <br />b. Take ultrasonic thickness measurements at 3:00, 6.00, 9:00, <br />and 12:00 positions for each diameter measurement location <br />(item 4A). <br />c. Measure the gap (crack) width at 1" intervals along the <br />entire length of the crack. <br />d. Visually examine the inside surface using photoflood illumina- <br />tion. <br />5. Take color photographs <br />a. In the as - received condition. <br />b. With the specimen removal locations identified. <br />6. Sample cutting <br />a. Cut 1 - cold cut at Twin City Testing Corporation for necessary <br />storage. <br />b. Cut 2 - longitudinally cut the cracked section at the 6:00 <br />and 12:00 positions with the crack located at the 3:00 position. <br />c. Cut 3 - saw cut 3" - 6" length from cold cut end. <br />d. Take color photographs of the exposed inside surface of <br />the pipe section where the crack is located. <br />e. Cut 4 - saw cut through the crack at the north end 2" from <br />the crack tip and lengthwise at the opposite end towards the <br />location of the cold cut. Prepare this specimen for separation <br />of the cracked surfaces. <br />l_ r ? tun 000 tal[mp <br />