※Client Goal

Provided detailed and accurate pipeline defects data for pipeline overhaul project every year；

※Technology challenge

Most of the SouthWest pipelines had the characteristics of long construction time, complex geographic environment, small pipe diameter, medium (natural gas) unstable flow velocity, high content of hydrogen sulfide；

The pipeline was highly abrasion to the vehicle seal assembly (seal cup, etc.)；

※Measure adopted

Using a series of low velocity packets, anti-hydrogen sulfide corrosion treatment procedures, etc. The high wear resistance type sealing assembly was used in the inspection tool；

※Conclusion

Through testing and comparison of several domestic and foreign ILI companies on the SouthWest pipeline, it had been proved that only PPL can carry out various modifications of the equipment through its strong research and development ability, and successfully completed various SouthWest inspection tasks. Since 2004, PPL has developed 8 sets of inspection data processing package system according to the characteristics of SouthWest pipeline, and achieved good technical results in operation practice

Through the verification of excavation, the accuracy of PII inspection was approved by SouthWest oil and gas field company, which ensured the owner to carry out targeted reinforcement and repair plan；

Since 2004, PPL has inspected nearly 1,000 km of pipelines in SouthWest Oil & Gas Field every year.

※Client goal

 Confirm the working status of Shanghai natural gas main pipeline network, ensure the safe, stable and efficient supply of gas to Shanghai region, and implement integrity management requirements；

※Technology challenge：

Pipeline run pressure was lower than 2MPa；

There were many bends in the pipeline, and the run was not stable；

※Measure adopted：

The low-voltage fitting was used to modify the tool to reduce the speed migration area. The purpose of installing this fitting was to reduce the speed migration to the maximum extent by reducing the burden of the vehicle.

※Conclusion

According to the characteristics of the low pressure pipeline, the MFL vehicle and mapping unit is reformed, and obtained the best inspection results. According to the inspection report issued by owner, selected eight points for excavation, excavation results show that the parameters of the eight features included absolute distance/the relative distance from girth weld/ the orientation and peak depth was consistent with the inspection report parameters. Client was very satisfied with the result of the report The owner has applied for the Shanghai science and technology progress prize for this project.

※Client goal：

Accurately identify and repair weld defects ；

※Technology challenge：

High flow rate was difficult to ensure successful inspection and ILI accuracy；

High static pipeline would result in inspection failure；

The owner was concerned that the pig and/or the vehicle might hit the receive trap door, causing a safety production accident；

※Measure adopted：

VBP variable bypass was installed on the vehicle to reduce the average speed of the tool to 2.96m/s；

NGE antistatic device was installed on the vehicle to ensure successful operation；

PPL's W022 receiving and launching procedure successfully received the pig for the limited distance between the by-pass air outlet line and the receive trap door, avoiding the safety accident of vehicle hitting the receive trap door；

※Conclusion

The pit feature with depth between 5 and 13% wall thickness near the girth weld was clearly detected, which met the inspection purpose of the west-east gas transmission client. The corrosion characteristics of the surface of the weak area of the shallow entanglement were detected according to the high-quality inspection data, and the corrosion depth was 1-5%, which provided the basis for the investigation and re-entanglement of the proprietor. At the same time, a number of abnormal girth welds were found.

※Client goal

Confirm the working status of the main pipeline network and implement the pipeline integrity management requirements；

※Technology challenge

Poor hoisting environment and insufficient working space

※Measure adopted

After preliminary analysis by PII, it is evident from the inspection sheet of preliminary report that there was metal loss features which was greater than 80%. On founding this, the project personnel of PPL immediately informed Chongqing Gas Field and Yubei transportation and Marketing Department of this dangerous situation, and then the three parties rushed to deal with on-site emergency to verify this site.

Because this site was located in nongjiale, the excavation cost was extremely high, accurate location became extremely important, if the location deviation would brought extremely high costs to the operators. After a variety of methods and multiple reviews by PPL, the final positioning and excavation verification data were accurate, detailed as follows

 ※Conclusion

After on-site verification, the inspection report data was completely consistent with the verified data at the excavation site, and the potential safety hazard was successfully eliminated for the client.

※Client goal 

Confirm the working status of the main pipeline network of Sinopec south China Co,ltd and implement the pipeline integrity management requirements ；

※ Technology challenge 

The field work is extremely difficult：

1.The working environment is a place with high sulfur. Personnel must wear a full set of safety protective equipment；

2.H2S content is extremely high, of which requirements on pig and inspection equipment is extremely high. Failure or disintegration of tool may occur；

※Measure adopted

※Conclusion

Southwest project team of PPL, completed P107-P106 pipeline(168mm) and P106-P104 pipeline(219mm) within 3 days on September 2017, both of the two pipeline, H2S content was about 15% within them. The tool was in good status after run, data quality was integrity. Our operating personnel and vehicle withstood the severe test, and the actual inspection results proved again that our inspection equipment could run successfully in the extremely harsh environment.