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Vulnerability in materials in sewage systems

This essay focuses on three central questions:

  1. What are the most common damages happening to pipes in waste water systems?
  2. By which factors are such damages caused?
  3. Which material is especially weak or strong in resistance against certain damages?

The advantages of pipe-materials and the needs of a proper sewage system are well known. Less highlighted are usually the disadvantages of materials or the most frequent damages occurring. This overview shall present these in three pinpointed questions and answers.

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Principal Groundwater Discharge

Krah Chile is using Krah PE-GF Pressure Pipe Technology since 2009. The installed Krah KDR 700 is able to produce pressure pipes with standard PE100 or with PE-GF200. Since beginning Krah Chile delivered their pressure pipes for many applications. One examplary project is described below:

Krah Chile produced more than 1300 meter PE-GF-pressure pipes in dimension DN 300 and for pressure class PN 16. The pipes are designed with a safety factor of 1,25, that means the total wall thickness is 15,8 mm ( SIDR 19)

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Helical Extruded PE Pipes / Pressure Application

Pressure Test DN/ID 1700, SDR 26, Design pressure PN 6

UGPM helical extruded Pressure Pipe PE100, ID 1700, PN6 – 6 m length, elongated to 12 m length

General:
Pressure pipes made of Polyethylene are successfully used since the 50ths of the last century. In more than 60 years the material has developed significantly in mechanical, thermal and physical characteristics. Mostly used in the pressure market is the pipe grade PE100 with a long term strength of 10 MPa (MRS 10). Furthermore you find in the market PE-types with optimized properties for example with a better resistance against slow crack growth, called PE 100 RC  (crack resistance) or fiber reinforced polyethylene pipes (e.g. Krah PE-GF 200) with very high strength and stability (MRS 20). 

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Outfall DN/ID 3000 mm in Peru

In this year 2013 a new record was made in Lima, Peru. Polyethylene pipes DN/ID 3000 were used for a deep water outfall pipeline. The polyethylene pipes were produced according to the Krah-Technology in Spain by PPA&Krah, Vitoria. PPA&Krah had already a lot of successful installed large outfall pipelines in the Mediterranean Sea and Atlantic Ocean. One of the challenges in this Project was to open a new site for the Krah Large Pipe Technology – The Pacific Ocean.

The “Taboada” Wastewater Treatment Plant is one of the biggest constructions for sewage treatment all around the World.

The aim of the Project was to increase significantly the amount of treated water in the city of Lima, thus reducing ocean pollution and improving the health conditions in the area.

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