July 2022, Vol. 249, No. 7

Tech Notes

DNV to Evaluate Use of Hydrogen in Czech Republic Pipeline

Special to P&GJ 

DNV, an assurance provider, has been asked by NET4GAS, the international gas transmission system operator based in the Czech Republic, to evaluate the hydrogen suitability of an existing DN 1400 pressure natural gas transmission pipeline and related stations. 

As a Central European gas transmission system operator, NET4GAS is an important player in the European gas market and is one of the sponsors of the European Hydrogen Backbone initiative that believes a European hydrogen infrastructure is needed for Europe to achieve its climate and energy objectives and greater energy independence. 

“It’s really encouraging to see another major hydrogen project taking place in Europe and with NET4GAS leading the way in Europe with other gas infrastructure companies,” said Prajeev Rasiah, executive vice president for Energy Systems, northern Europe at DNV. 

The initiative’s goal is to build a hydrogen infrastructure, primarily based on repurposing existing gas networks, to connect potential hydrogen production and consumption sites, where NET4GAS will play an important role.  

NET4GAS has initiated a large-scale internal project to map the existing infrastructure and its preparedness for the transmission of pure hydrogen and various hydrogen blends with natural gas.  

DNV is investigating different scenarios for mixtures of hydrogen and natural gas within a range of percentages starting from 2% up to 100% H2. The complex assessment of DN 1400 includes integrity aspects as well as safety, metering, operation and maintenance topics.  

Conceptual guidance is provided by the American Society of Mechanical Engineers (ASME) B31.12 code, the European Industrial Gases Association (EIGA) and Industrial Gases Council (IGC) guidelines, and it is heavily complemented by in-house DNV knowledge.  

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