Visser & Smit Hanab was asked by Groningen Seaports to build a new overground steam pipe near Chemie Park Delfzijl.This pipe supplies steam from the wood-fired Eneco plant to companies in the Chemie Park that need it for their production processes.
The new steam pipe is located adjacent to the dike and runs from Eneco's Bio Golden Raand biomass plant to the Chemie Park Delfzijl (Delesto). The steam pipe is 500 mm in diameter and has a length of 2.6 kilometres. Installed alongside the steam pipe is a condensation pipe, which has a diameter of 250 mm and a length of 1.7 kilometres. The turnaround time for this project was very short: from January to August 2016. Within this time frame, the 450 foundation piles and the concrete foundations were produced, and steel structures and pipe bridges built for access to the site and spanning the installations and pipelines.
The steam pipe runs across different third-party sites, including those of other chemical companies. Coordination with all these parties was an essential element of the project.The installation met the PED guidelines.The required operating conditions for the steam pipe are 40 bar and 350 degrees Celsius, for the condensation pipe they are 5 bar and 45 degrees Celsius. An optical fibre cable was installed alongside the entire pipeline for control purposes.
Visser & Smit Hanab's prefab workshop in Veendam manufactured all S-bends for the expansion loops, which are located at 30-metre intervals along the pipeline route. The S-bends were made without fitted length. This set exacting requirements for the accuracy of the work, but had the advantage that the prefab components could be immediately installed and welded on site. This reduced the number of hours and manpower needed on the construction site, increasing safety and efficiency.
Eneco burns waste timber in its plant. The incineration produces heat, which is then turned into steam. Part of the steam is converted into electricity in a turbine. The distribution of green steam by Eneco reduces CO2 emissions by over 100,000 tonnes a year, because customers no longer have to produce the steam themselves. The dependence on fossil fuels also decreases.