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Pipeline Technology Journal 2-2015

Latest developments and news from the pipeline industry

Figure 4: Installation of the temp- orary trap To ensure the supply of this huge amount of water CEPS built 4 water lines to connect mobile pumps with the end of the inspected pipeline sec- tion (see Figure 5). After removing of the inspection tool from the receiv- ing trap, the check of measured data was done. This confirmed that the TFI tool was already at its first run propelled through the pipeline section at the required velocity (see Figure 6 on the next page) and the measured data were good for their further processing. ASSESSMENT OF INSPECTION FINDINGS The TFI provider evaluated the detected defects using the industry standard ASME B31G, RSTRENG, API 579 (level2) and DNV-Code and recommended to repair 162 defects. REASSESSMENT OF DEFECTS - A NEW APPROACH CEPS divided defects revealed by the internal inspection into two basic groups: • Large defects (overcritical), that would surely cause a rupture of pipeline wall in the process of integrity test. These defects were cut-out and replaced by a new spool prior to the integrity test, • Smaller defects (subcritical), that had been evaluated by TFI as un- acceptable and destined to be repaired, but during the integrity test were stabilized, so that their repair was not needed. This enabled a fundamentally different approach to the results of the internal inspection which significantly reduces the required number of pipe repairs after internal inspection and provides higher pipeline relia- bility because during the integrity test also other defects that were not within the inspection recommended for repair or were even not detected at all are stabilized. Figure 5: Launching trap with the water supply pipeline and hoses RESEARCH / DEVELOPMENT / TECHNOLOGY PIPELINE TECHNOLOGY JOURNAL 21

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