Gas analyzers help get approval for Nord Stream gas pipeline

  • October 09, 2015
  • Case Study

October 9, 2015 - The construction of Nord Stream, the large double gas pipeline between Russia and Germany, faced enormous challenges when it came to engineering and political red tape. Hint’s expertise in control & automation played a decisive role in the certification of the pipeline’s security and the construction of the sampling instrumentation system. It provided the missing documentation and also advised on the installation of the gas analyzers.

Nord Stream is an international consortium founded about seven years ago to build a gas pipeline network to transport Russian gas through the Baltic Sea to Western Europe. Gazprom (51 percent) is the largest shareholder in the consortium, followed by the German companies E.ON and BASF. The Dutch Gasunie has a 9 percent interest in the project, which required an investment of about 8 billion euros. The construction of the pipelines was begun in 2009 and was completed about two years ago. They can now annually transport 55 billion cubic meters of gas.

An unknown terrain

Ruurd Hoekstra, Director of Construction for Nord Stream since 2009, was involved in creating the pipeline. He talks about some of the challenges that arose in the project, which, especially in the beginning, had mainly to do with determining the route. "In 2009 it was still relatively unknown what the bottom of the Baltic Sea looked like," says Hoekstra. "You have to imagine that the sea floor is not flat, but has mountains, valleys and other obstacles. We had then conceived a route of 1,200 kilometers through relatively uncharted territory; terrain where lots of mines had been laid during World Wars, and the risks of those mines were difficult to assess. And then you also had to consider things like nature and fishing grounds where you can’t simply lay down a pipeline.” Other major engineering issues included landings and the many dredging activities that would need to take place.

Det Norske Veritas Still, the mechanics, according to Hoekstra were not the biggest obstacle. "It was mainly a huge challenge to get permits for the project," he says. "You not only have to deal with obtaining permits from the concerned countries of Germany, the Netherlands and Russia, but also the countries through whose territory the pipeline goes, like Finland, Sweden and Denmark. Moreover, in Europe we have the Espoo process, a rule that means neighboring countries in the Baltic States also need to participate in the project and to have a say, which means you have to have discussions with authorities in all of those countries.”

Not all the countries involved could ask specialist questions and oversee all of the risks and consequences required for the construction of a pipeline. The Finns, for example, have no offshore industry, while the Danes do. Certification of the route and the technical design were therefore delegated to Det Norske Veritas, a global Norwegian classification society. They have set a standard for how to build an offshore pipeline and also how to build a pipeline security system.

Pressure, temperature …

Hint, Dutch specialists in control and automation and information technology for the oil and gas industry, played a crucial role in obtaining the certification. Firstly, they were instrumental in the certification of the pipeline’s security. "In gas transport, the difference in pressure is utilized. At the beginning of the route, in Russia, there is a compressor station which brings the gas under high pressure so that it can flow to Germany. This high pressure brings with it risks because the pipe can only handle a limited amount of pressure. Moreover, the temperature of gas decreases when it is pressurized. Such reduction in temperature has an impact on the mechanical properties of the steel in the pipeline, which is also a risk,” says Hoekstra.

In order to overcome this, an electronic security system had to be constructed to ensure that the temperature and the pressure could be monitored. However, it proved difficult to get the system certified by Det Norske Veritas. "The point was the technical design was all right, but in many ways it was not well documented. For certification, of course, that was a problem, because if you can’t demonstrate how you built it you also can’t obtain certification for it.” Hoekstra, therefore, took the Hint experts there. "I knew Wouter Last (President Hint, ed.) from my time with Shell and knew what Hint had to offer. Hint’s people are top experts and the company has a number of specialists in the field of safety systems. They studied our system in detail, so we could get around the certification."

… and quality

 Hint was not only involved in the construction of a security system, but also in the establishment of a system for measuring the quality of gas. "Building a system to measure pressure or temperature is not that difficult, but it is very difficult to create a system that can accurately determine the quality of gas,” says Hoekstra. "The gas that we carry through Nord Stream is not one component, but is a blend of different components. Hint has helped us to build gas analyzers that can determine, on the basis of the samples, the blend’s composition. The gas must, for example, contain enough combustible hydrocarbon gas molecules and that is measured by our analyzers.”

From a distance

Now that the project has been completed Hint plays a more limited, background role. The Nord Stream organization is now building up its own expertise on its measurement and processing systems. Hint is primarily engaged in the transfer of knowledge about effective documentation, among other things. They will also be involved with Nord Stream again when certifications expire. Moreover, there are plans for a second project involving a third and fourth pipeline. Hoekstra: "Preparations to build a third and fourth Nord Stream pipeline are underway!"


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