SLA® in Norway: Rehabilitation of the Main Water Supply from Stavanger City Center to the Hundvåg District

To ensure the drinking water supply for the 14,000 residents of Stavanger’s Hundvåg district, the rehabilitation of the main water supply became necessary. The city administration opted for the diffusion-tight egeplast SLA^® Barrier Pipe. Although the Installation was initially planned using the burstlining method through an existing cast iron pipe, a change to Open Trench Installation was required.

Challenging Ground Conditions

The main water pipeline runs from Stavanger city center to the Hundvåg district. For the rehabilitation, the pipeline – starting at the inlet structure on the quay in the west – was connected to the existing underwater pipeline of the city of Stavanger and then continued along Ulsnesveien. With the final 708 m, this important rehabilitation measure was completed with this section.

This project became a challenging construction measure, primarily due to the demanding ground conditions, which were characterized by remnants of walls and buildings. For this reason, the original planning had to be revised. Instead of an Installation using the burstlining method through the existing 450 mm cast iron pipe, the entire pipeline had to be installed using the Open Trench Installation method.

Requirement: Diffusion-tight Pipes

Since the city administration requires diffusion-tight pipes for projects in a defined area below sea level, it was decided here too to use the egeplast SLA^® Barrier Pipe, which has been used by the city of Stavanger for many years and has already proven itself in various projects. To ensure a smooth process and optimal installation, close cooperation with egeplast was relied upon.

Kine Homleid Johansen, Project Manager at the Municipality of Stavanger, values the high quality of training and services provided by egeplast: “The continuous exchange and close cooperation in all project phases give us a sense of security in our joint projects. We thank egeplast for the excellent collaboration and would work with them again at any time.”

Trial installations revealed that the ground conditions did not permit the burstlining method.

Sondre Dammen, Head of the NoDig Department at Steg Entreprenør, the construction company responsible for the delivery and welding of the pipes, draws a similar conclusion. After various burst lining projects in Norway and Sweden, and many kilometers of installed egeplast pipes, he summarizes the cooperation as follows: “Our trust in egeplast is great and we are not only very satisfied with the service, but above all with the great flexibility with which solutions are always found quickly.”