PSI - Issue 60

Rohan Nair et al. / Procedia Structural Integrity 60 (2024) 93–114 Rohan Nair / StructuralIntegrity Procedia 00 (2023) 000–000

102 10

Fig. 10: AE Instrumentation layout for proof pressure test, cyclic MEOP & cyclic proof pressure test

Based on proof pressure test, test article was subjected to pressure cycling tests. The instrumentation scheme and strain gauge mounting locations were kept same for pressure cycling tests. The testing sequence and pressurization scheme for pressure cycling tests followed is as shown in table-4. The test consisted of 8 MEOP and 12 proof pressure cycles. After pressurizing to MEOP and proof pressure values following the pressurization scheme, the test article was depressurized to ambient (starting) pressure which marked completion of 1 cycle and the same was repeated for specified no. of cycles.

Table 4: Testing sequence and holding time for each Pressurization stage Step No. Tank Pressure (MPa, Gauge)

Remarks

1

0

Start of Test

2 3

0.15

Strain gauge cycling, Verify strain data

0.2

1 minute hold on each step or till AE clearance

4

0.3

5

0.4

6

0.51

MEOP – 3 minutes hold

7

0.58

Proof - 1 min hold

8

0.64 (+0.02/-0)

Ultimate pressure - 1 min hold

9

Increase the pressure in the water tank gradually till bursting occurs.

Burst and End of test