1. Problems in existing sewage pipe lines

The Krah Pipe System has been designed to solve the major pipe failures in existing pipelines. According to a German study made by ATV the failures were divided into several sub-failures. But always the result was infiltration and exfiltration and the maintenance /repair costs are very high. As follows you will see here some photos of failures would NOT have happened, if the system was done with Krah-Pipes.

The town „Rasseln“ wich is a part of the city Mönchengladbach in Germany wasn’t connected to the sewage network until 2011. The used water had simply been let seep away, which is not permitted.

The NVV (Niederrheinische Versorgung und Verkehr AG), which is responsible for the proper disposal of any sewage, planned the construction of a large mixed water channel. The project consisted of building a large storage channel and pipelines to connect the town of “Rasseln” to the sewer system of the city of Mönchengladbach. In Rasseln sewage water runs into a pumping station and via two pressure pipes into the sewer systems of Mönchengladbach.

To solve this challenge two options were possible:

1. rectangular concrete channel with lining and a dry weather channel

2. Retaining channel of PE consisting of PE- buildings and profiled pipes DN 2000 with dry weather channel

10 Questions for Mohammed Al Hashani / UGPM

Introduction

Manholes are, beside pipes and fittings, an essential element of underground pipe-systems. They are used for maintenance and inspection of sewers, sampling point or are fixed part of process technology / fluid engineering. The fabrication of thermoplastic manholes can be done in different ways of production. While, in smaller dimensions (DN ≤ 800), blow molded, injection molded or rotation molded manholes are in the market, manholes made of profiled pipes (helical extruded pipes) and semi-finished products will be used in medium sized and large diameters (DN800 to DN4000). Especially, the materials Polyethylene (PE) and Polypropylene (PP) are popular, due to their very long service life (> 100 years), good flexibility, high impact resistance, high strength, safety and low weight.

The authors of this report have large experience in the production and application of plastic pipes in the Sultanate of Oman. The Sultanate of Oman is well known for the high investments in the build-up and renewal of the infrastructure. Consequently, high quality materials will be used which high safety and guarantee a maximum service life. This has a direct implication in the use of very high quality-standards and specifications for testing during the production of large diameter manholes, which are more stringent and comprehensive than those used in many European countries.