Visser & Smit Hanab has been hired by gas supplier Stedin to inspect and, if necessary, replace all domestic natural gas connections in the areas in and around the Dutch cities of Aerdenhout and Bennebroek.
These connections must meet a number of specifications, so that pressures can be increased from 30 mbar to 100 mbar. Higher system pressures are necessary to ensure the future reliability of the natural gas delivery system. One of the requirements for increasing system pressures is a pressure regulator, which is critical in 100 mbar systems to guarantee the safe, continuous supply of natural gas. Visser & Smit Hanab is checking to see whether such regulators are already installed, and installing them where needed.
At the same time, they are checking the quality of the existing service lines. If these are substandard, they will repair either the entire connection or the faulty sections. Beyond that, Visser & Smit Hanab is replacing all of the outdated gas meters with 'smart' versions. A smart gas meter is a digital meter that can be read remotely. The advantages for the consumer are that no longer need to send in their annual meter readings and now have an overview of their energy consumption, making it easier to conserve energy. Work is being performed on some 4,000 residences.
Visser & Smit Hanab recently completed a similar project in Ouderkerk aan de amstel, in which pressures were increased to 100 mbar for about 2,500 residences. That project was completed without incident.
In addition, the connections in the areas in and around Bloemendaal and Overveen (+/- 3,000) have almost been completed. The next step is to re-check the connections. Visser & Smit Hanab is providing the client with photos for that purpose. Stedin will then physically re-inspect a random sampling of 10% of the connections delivered. If these all pass muster, pressures can be increased here as well.