2024. 02. 01..

Some 5 000 km of water pipes runs underneath the Hungarian capital, and a significant percentage of the network is composed of 50-90-year-old segments. Since the pipes are designed for a lifespan of 100 years, their replacement is a pressing matter. With changing water consumption, some parts of the system also became oversized, leaving stagnant water in the main lines.

In a recent project, a consortium uniting Penta Kft. and Colas Alterra Zrt. carried out an upgrade of the pipelines valued at nearly 20 billion forints – with Alterra’s share amounting to 11.5 billion.

Most importantly, the scheme required us to replace 6.6 km of old DN1600-DN1200 Sentabtype lines with smaller diameter austempered ductile iron pipes to ensure suitable flow speeds and water qualities. Representing a significant challenge, the job entailed the renovation of the line connecting the two banks of the Danube at Southern Budapest, as well as the installation of pipes underneath one of the country’s busiest routes, main road 6.

To ensure adequate water quantities, Alterra also overhauled 60 radial collector wells on Szentendre Island and Csepel Island. At each of the wells, we jacked six 30-m-long horizontal manifolds into the ground, and modernised all mechanical and electric components.

At the same time, the Hungarian Colas subsidiary replaced a total of 2956 water service connections made of outdated lead pipes – interestingly, this part of the works covered all 23 districts of Budapest.

Construction was kicked off in the autumn of 2021, and the technical handover procedure was closed on 16 November 2023.

Colas Hungária