HDPE PIPE Information 1

Februari 7, 2020 by admin in Uncategorized

Planning phase for sea-intake pipes

Most relevant for the intake-pipe DN/ID 3600, which had to be installed completely in the river bed of the Parana de las Palmas, was the total weight of the 84 m pipeline. During the planning process, different pipe materials were compared for the mentioned scenario under the local conditions to find the most suitable option. The pipeline is statically fixed to certain spots. These are two large-volume basins made of concrete. All calculation procedures have shown that a HDPE pipe represents the optimal solution from a macroeconomic and technical perspective.

Calculations about bearings such as the anchoring via pipe clamp systems resulted in the consolidated finding that significant cost savings would be possible with the ise of plastic pipe materials. Compared to concrete material, a weight saving factor of 9.6 was observed. These savings allowed a significantly more favorable fundament. Furthermore, the comparison of the pipe lenght options between larger plastic pipes and concrete pipes showed a significant cost advantage for the installation of the pipeline (more than 25% cheaper). Additionally the tightness issue served as another argument. Consequently, the Contractors Company and the planning engineers decided to select a plastic pipe system for this difficult and unusual mounting case.

Remarkable is simply the fact that the required dimension and connection with the demanded wall thickness has never been produced or installed before worldwide. A typical case for Krah AG and Krah-large pipe technology!

Plastic Pipe source

The reputation and the widely spread network of the Krah AG in Germany and its clients worldwide was used by the contractors to discuss the project’s challenges with one of the world’s largest and most experienced manufacturers. Quickly the engineers of Krah AG found answers to this mounting case and could even find a pipe manufacturer from the Krah Community in Argentina. All participants were impressed by the proportions and dimensions of this unique pipe section and worked extremely hard on a common approach for the implementation of the overall project. A delegation of the new joint venture visited Krah AG in Germany to evaluate the possibility of realizing the sophisticated project in polyethylene.

Advanced additional Engineering

Before the actual pipe manufacturing could begin, local public institutions had to agree upon the pipe component and connection. The pipe samples were tested for homogeneous produstion in the pipe cross-section and the joints for tightness. As for the connection technology, specialists were included in this issue in advance. The specialist for this field of application in Germany calculated with the finite element method (FEM), the execution parameters of the electro fusion weld seam plus the extrusion welds regarding the state of installation and the final state of the compound in the river bed. A welding factors (DVS) of 0.6 was used in order to guarantee the pipelines’ tightness and thus security for the whole project. The electro fusion technique was carried out with two instead of one single heating zone due to the joint surface, which rounded off the entire connection technology by additional inner and outer extrusion welds.

article source:
Handbook on large plastic pipe