Krah Community - Members' Magazine #6
Article 1 Tartu Ihaste
DN1500 Pipeline Renovation Project
Article 2 Advantages
of using High Modulus Polypropylen for gravity pipes
Article 3 Krah Comtruder® Technology
ready for High Modulus PP BorEco BA212 E
See also: BorECO™ High Modulus PP (PP-HM) for sewer applications
ImProfil of: Stephan Füllgrabe / Plaspitec
Flanges for large diameter plastic pipes
Companies introduce themselves - Plaspitec / G&S Plast
Informations: Current Market Prices for Commodities in Middle and Eastern Europe

Welcome to the 6th issue of ImProfil

Alexander Dear readers,

Although everybody is talking about the worldwide crisis, the market for innovative plastic production machines and construction industry in general is still booming in many parts of the world.

Governments of countries try to improve the difficult global situation by generating economic activities mainly in the area of infrastructure projects.
New and infrastructure projects that were on hold are now pushing also the market of large diameter pipes and pipe production machines.

New innovative pipe systems increase the chances for plastic pipes to be considered by project planers, contractors and civil engineers.
One of those innovations and the main subject of this issue is High Modulus Polypropylene and its comparison to conventional plastic pipes.

I hope you enjoy this edition and we are always keen to know your comments, suggestions and wishes regarding the past and future newsletters!

With kind regards

Alexander Krah
CEO of Krah AG

Tartu Ihaste DN1500 Pipeline Renovation Project

Tartu, with its population of 101,246 (Population Census data from 2000) in an area of 38.8 square kilometres, is the second largest city of Estonia. Tartu, lying 185 kilometres south of Tallinn, is also the centre of Southern Estonia. The first written records of Tartu date from 1030.
With the constant development of the rainwater and sewage pipelines, city of Tartu arranged tender to renovate old 1500mm concrete rainwater pipeline.


Project description
Mission: To build a new sewage pipeline from the manhole K8 to K1, overall length of the pipeline is 961,5 meters. Concrete manholes shall be replaced with new PE manholes. PE manholes should be ID1000 and there must be room for the portable ladder, hatches of the manholes have to be with a load capacity of 40 tons.
The existing pipeline is DN1500 reinforced concrete. Minimum internal diameter of the new pipeline has to be 800mm. All the pipe joints of the new pipeline have to be welded. Space between the new and old pipeline has to be filled with concrete.

(Read more...)

Advantages of using High Modulus Polypropylen for gravity pipes


Pipes are getting larger and larger in diameter, but while plastic pipes are entering the huge market of concrete pipes, the main barrier is still the high price of the raw material. Some authorities still don´t accept and consider the importance of the advantages of a long life time and a sustainable pipe system, or they just don´t want to spend the money for the future of their country. So the question is how producers of plastic pipes made of High Modulus Polypropylene (PP-HM) can deal with this problem.

How can existing “conventional” pipe producers enter these markets with technically better products and very competitive prices?

Today large sewage and drainage pipes are mainly produced with standard polyethylene or polypropylenes. Mostly, structured wall pipes are used for these applications according to international standards like:
DIN16961, EN13476, NBR7373,JIS, ASTM F894

Short term E-module (E) of different polyolefin materials (usually they can be used in normal single screw extruders):

  • E(PE80) = 800 N/mm²
  • E(PE100)=1000 N/mm²
  • E(PP-HM, BorEco BA212 E) = 1700 N/mm² (a product made by Borouge and Borealis)
To make an easy calculation, we should start with reducing a solid wall thickness by increasing the E-modulus of the material (standard material can also have a higher short time E-modulus).

(Read more...)

Krah Comtruder® Technology ready for High Modulus PP BorEco BA212 E

In August 2012 representatives of Borouge and Borealis have visited Krah AG to attend the tests of the Krah Comtruder®-Technology using their high stiffness Polypropylene. The tests were made on a machine sold to the Ukraine and the test runs were made using BorEco BA212E. The customer was very pleased about the results of the extrusion trials.

The test results are very satisfying and the output of 760 kg/h for a profiled pipe made of BorEco BA212E (DN 900, SN 12) demonstrate the excellent performance of the Krah Technology with a High Modulus Polypropylene material.


Both companies have agreed to develop together a completely new and innovative pipe system utilizing BorEco212E, mainly for pipe sizes in the range 800 mm to 4000 mm, including jointing, fittings and manholes. The complete pipe system will be produced by using Krah-Winding Technology. One of the main advantages is that only one production technology is capable of producing the complete range of pipes and pipe accessories in all diameters.

(Read more...)

BorECO™ High Modulus PP (PP-HM) for sewer applications


Polypropylene has an excellent track record after more than 30 years of service for non-pressure sewage and drainage applications. The inherent material properties and their development, energy and cost efficiency, pipe design and ease of manufacture and installation have contributed to this success. The traditional cornerstones of the requirements profile such as impact resistance, stiffness and chemical resistance are increasingly being supplemented by demands for purity, sustainability and recyclability. Consequently, the continuous development seen in both material and pipe design has brought additional benefits to pipe producers and end users and is contributing to a more sustainable environment.

The first generation of PP with higher modulus PP was introduced in 1998 and provided a major step forward with an optimized balance of the stiffness-impact properties. A few years later, this product was improved and an E-modulus of 1700 MPa was achieved, representing the first PP-HM to meet the requirements set in the modified EN1852 standard in 2002 (which was adjusted based on the development of this new class of polypropylenes). The journey has continued and recently, the next generation PP for underground drainage and sewage has been introduced. It presents the first and unique 2000 MPa PP-HM from Borealis – BorECO™ BA2000, achieved without the use of fillers, meeting and exceeding the requirements set in the recently - again - modified EN1852.

(Read more...)


10 Questions for...

Stephan Füllgrabe / Plaspitec

(Read the interview online...)

Flanges for large diameter plastic pipes

The main task of pipe systems is to transport a medium in a safe way and without any leakage from one place to another. For polyethylene and polypropylene systems homogenous jointing connections are preferably used, as the sustainability and safety are guaranteed and they are maintenance-free as well.

Flange connections are also a very important jointing method within a pipe system, as they are a detachable connection and thus allow a transition to other pipe materials.


The main areas of applications for flange connections are:

  • Connection to valves and shut-off devices
  • Connection to other materials (e.g. steel)
  • Connection to buildings
  • Maintenance ports
  • Pipe caps
  • Connection to special parts and fittings

(Read more...)

Companies introduce themselves


G & S Plast