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Pipeline Technology Journal 2-2015

Latest developments and news from the pipeline industry

RESEARCH / DEVELOPMENT / TECHNOLOGY The extended wave propagation method is based on the same physical principle as the wave propagation method. It takes into account addi- tional values from pressure sensors installed in measuring and control stations along the pipeline, for example, and speed of sound data for the current product. This enables more precise localisation of the leak by re- ducing errors due to delayed sensor reaction or slow signal transfer (see Figure 4: Leak localisation by the extended wave propagation method). The E-RTTM introduced here is the basis of the PipePatrol leak detec- tion system by KROHNE. The company, which supplies systems to the oil and gas industry, also provides pipeline monitoring technology. The system is suitable for monitoring liquid and gas pipelines (including liq- uefied gas and supercritical products) and meets all the requirements of API RP 1130 and CSA Z662 Annex E. PipePatrol is very easy to use: it is installed on a dedicated server and operates completely autonomously. The user interface can runs on a separate workstation, or be integrated into an existing control system (see Figure 5: PipePatrol leak detection system, basic topology. The user interface features intuitive operation: only the information that the current user needs for his scope of work is displayed. In principle, PipePatrol can be integrated into any new or existing in- frastructure; this applies to both the control system and the measuring technology used. An example of a more complex application is shown in Figure 6: PipePatrol leak detection system, extended topology. Operators can learn to use the system in just a few hours. In addition to the visualization of the pipeline operating conditions, PipePatrol can in- dicate leak positions on a map, which simplifies and speeds up a service technician’s work. Ethernet and serial interfaces support protocols such as OPC, Modbus TCP/lP, Modbus Serial, HART and PROFIBUS. Application note In addition to standard applications (liquid, gas, liquefied gas and super- critcial products), PipePatrol is also capable of monitoring pipeline net- works. An example application in Canada demonstrates how quickly and precisely leak detection functions in practice. A major oil & gas company operates several pipelines for which CSA Z662 Annex E applies. Figure 3: Leak localisation by the wave propagation method Figure 4: Leak localisation by the extended wave propagation method Figure 5: PipePatrol leak detection system, basic topology Figure 6: PipePatrol leak detection system, extended topology PIPELINE TECHNOLOGY JOURNAL 27

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