13th International Conference on Fracture June 16–21, 2013, Beijing, China displays the average pressure growth rate range (0,15 – 0,52 MPa/s) at the initial stage of the burst tests, which can be evaluated as quasi-static value range. 0 5 10 15 20 25 30 0 100 200 300 400 500 600 700 Time, s Internal pressure, MPa DN 200: B_a1 DN 200: B_a3 DN 200: B_a4 DN 200: B_b1 DN 200: B_b2 DN 200: B_b3 DN 200: B_b4 DN 200: B_b5 DN 200: B_b6 DN 200: B_b7 Figure 2. Internal pressure vs. time diagrams during the burst tests of the pipeline sections in the B_a and the B_b testing groups Fig. 2 demonstrates the internal pressure vs. time diagrams of the investigated DN 400 pipeline sections in the CS_b testing group (see also Table 1 and Table 2) during their burst tests. 0 5 10 15 20 25 30 0 100 200 300 400 500 600 700 800 Time, s Internal pressure, MPa DN 400: CS_b1 DN 400: CS_b2 DN 400: CS_b3 DN 400: CS_b4 Figure 2. Internal pressure vs. time diagrams during the burst tests of the pipeline sections in the CS_b testing group -5-
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