From natural gas pipeline to hydrogen pipeline
As we build the national hydrogen network, we reuse existing natural gas pipelines wherever we can. Many of these pipelines can be used to transport hydrogen. Before using them for hydrogen, we inspect them thoroughly and make any necessary modifications. This is what we call ‘repurposing’ or ‘reusing’ pipelines. It allows us to build a nationwide hydrogen network faster, more sustainably and with less work.
Smart use of what’s already there
The Netherlands currently has an extensive network of natural gas pipelines. As Dutch society moves away from natural gas, many of these pipelines can be given a new lease of life as hydrogen pipelines. Reuse comes with several benefits:
- Less work in the area
- Less excavation
- Faster construction of the hydrogen network
- Less material needed
- Sustainable use of existing infrastructure
From natural gas pipeline to hydrogen pipeline in 7 steps
Step 1: We check the pipeline
Before we can use a natural gas pipeline for hydrogen, we check whether it is still in good condition. Using special measurement equipment, we inspect the inside of the pipeline to check for damage and assess whether it can be used safely. If the inspection reveals potential damage or defects, we dig up the affected section for closer inspection. This also allows us to determine what needs to be done to repair the pipeline.
Step 2: We remove the natural gas from the pipeline
Before we do any work on the pipeline, we remove the natural gas from it. Most of this purged gas flows to other natural gas pipelines. This is how we prepare the pipeline for repurposing.
Step 3: We fill the pipeline with nitrogen
As soon as most of the natural gas has been removed from the pipeline, we fill it with nitrogen to remove the last traces of natural gas. With all the gas purged, we can safely work on the pipeline.
Step 4: We repair the pipeline where necessary
Sometimes the inspection shows that a specific part of the pipeline requires extra attention. If so, we repair the pipeline by, for example, replacing the affected section or applying a coating for better protection. This is how we make sure the pipeline continues to be safe and reliable.
Step 5: We disconnect the pipeline from the natural gas grid
Since the pipeline used to be part of the natural gas grid, we have to disconnect it from other natural gas pipelines and remove components that are no longer needed.
Step 6: We install new components
Next, we install components that are compatible with hydrogen. These components can include valves that let us shut off the pipeline for maintenance, in the event of a fault, or when expanding the network. Hydrogen valves are not the same as those used for natural gas. This is because hydrogen consists of smaller molecules than natural gas. By using these specific hydrogen valves, we prevent hydrogen leaks.
Find out more about valves in the hydrogen network
Step 7: We put the pipeline into service
Once all the work has been done, we fill the pipeline with hydrogen. This is when the pipeline is integrated into the national hydrogen network and can be used for hydrogen transport.
Safety first
Before we start using a natural gas pipeline for hydrogen transport, we perform a comprehensive assessment of whether it is fit for this new purpose. Where necessary, we carry out repairs or replace components. Alongside that, we conduct additional inspections and tests to ensure a safe and reliable hydrogen network.
How does it affect you?
For local residents
When we repurpose existing natural gas pipelines, we often only need to carry out minor works. At some locations along the pipeline route, we conduct inspections, replace components or modify valves. If more extensive work is needed, we always notify local residents in advance.
Frequently asked questions
Why can natural gas pipelines be reused?
Many of the existing natural gas pipelines are in good condition and can, after inspection and possible modifications, also be used to transport hydrogen. This means we do not have to lay new pipelines everywhere. Prior to a pipeline becoming part of the hydrogen network, we perform a comprehensive assessment of whether it can be used safely and reliably to transport hydrogen.
How can you tell whether or not a pipeline is safe for transporting hydrogen?
We always examine a pipeline extensively before integrating it into the hydrogen network. We inspect the inside of the pipeline, assess its technical condition, and carry out repairs or replace components as necessary. Only pipelines that meet our safety requirements will actually be used to transport hydrogen.
Will my street have to be dug up?
Usually not. Given that we are reusing existing pipelines, we often do not have to do any work along large sections of the pipeline route. Work may, however, be required at locations where we need to replace pipeline components, carry out repairs or modify valves for use in the hydrogen network. If such work will have an impact on your local area, we will inform you in advance.
How will the repurposing affect me as a local resident?
When we inspect pipelines, we access them from existing valve locations, meaning that no work will be required along most of the pipeline route. In areas where we do need to carry out work, we will inform local residents in advance of what work that will be and when it will be performed. After the pipeline has been put into service, you will not notice that hydrogen is being transported through it. As with natural gas, the hydrogen is transported underground.
What impact will the repurposing have on my land?
In most cases, it will have little impact on your land. The pipeline will remain in the same place. Sometimes, we have to carry out work on the pipeline, such as to repair a pipeline section or to modify a valve location. If such work will have any kind of impact on your land, we will contact you in advance.
Can I keep using my land?
Yes. After the pipeline has been repurposed, you can continue using your land as usual. As is the case now, there will still be rules in place to prevent damage to the pipeline. For example, you need permission to dig to certain depths or build something, plant trees or place other large objects above the pipeline.