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Flexibility or flattening test

What does it means and why should a pipe fulfil the requirements?
Today the requirements for a sustainable pipe system have changed, not always the cheapest solution is the best for a country. More and more designers and engineers dare to search for the technically best product for a project, at very reasonable costs. Also the cost aspect changed from single costs to the „lifetime cost“– from cradle to crave, including all.

So, which support for a designer or a quality control department does the so called flexibility test or flattening test mean? How is the test-procedure and how should the result be valued? In several international and national standards like EN13476, DIN16961, ISO 21138 or the ASTM F-894 a link to these tests is given – but why?

Basically the test will check how flexible a pipe can be, without having any irreversible damages on the pipe. This pipe property will give safety to the designers against overloading of the pipe or ground-movements occurred by earthquakes or unexpected soil settlement.

The standards for the test: The flexibility test is ruled in ISO 13968 and the flattening test is ruled in ASTM F894 8.6.

Deflection at 30%
Picture 1: Deflection at 30%

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First days of KR800-MAX

The final test of the newest pipe production line before shipping

At least once or twice per year interested companies are invited to attend the final test run or the „first days“ of a new production line KR800-MAX for a Krah-Pipes production at the facility of the machine producer (KAT -Krah Advanced Technology  GmbH) in Schutzbach, Germany.

Our Team with customersPicture 1: Some of our team with customers in front of the machine

This time the newest KR800-MAX is tested according to a very specific testing procedure to guarantee a quick and error free installation at the customer´s site. Several potential new customers from all over the world took the unique opportunity to enjoy the high performance of Krah-Pipe Production machines and also to take a company tour – so they can pay a visit in the RnD Department, Software developing department (WIN-KDR, MICKEY, PONTIS and all other APPs are developed here), tool making, construction, installation and also to the very impressive „mandrel“-production, where black-smiths are working hard with steel to produce giant mandrels up to DN/ID 5000 mm.

The machine presented will be shipped and installed for a customer in the Middle East where it will produce pipes successfully for a lot of pending huge projects.

This test procedure is the same for every production line, before being packed and leaving our facility. The test are mainly done with the extrusion line, because many other parts are already shipped in partial shipments before. It is the first time in the machine life a pipe will be produced. The heart of the extrusion line is a Kraus-Maffei single screw extruder 125x36D. This extruder is the best choice for this kind of production – low RPM (revolutions per minute) and a high output with perfect plastification.

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Introducing...Mohammed Al Hashani, UGPM Oman

Mohammed Al Hashani is the Vice President, Krah Middle East based in Kuwait. In addition, he is the Managing Director of United Gulf Pipe Manufacturing Co LLC (UGPM), which is based in the Sultanate of Oman. Key products include HDPE pipes, fabricated items such as Manholes, House Connections etc and other accessories. UGPM, under his able leadership, has achieved the following quality certifications: ISO 9001, ISO 14001, ISO 18001 related to Quality, Environment and Health & Safety.

In the interview, he informed us that he works hand in hand with the three C’s: Client, Consultant, Contractor; utilizing complex calculation techniques to arrive at a customized product that meets specific and definite requirements. Products developed are highly cost effective, with a long life, meeting environmental concerns, keeping low maintenance costs, producing homogenous product using specializing welding techniques for secure jointing, for quick and easy installation without additional training or expensive equipment.

Given the nature of the products, their applications, and stringent requirements from the three C’s, the company places maximum emphasis on Quality. This is evidenced by the fact that the department head reports directly to the MD.

Mr. Mohammed Al Hashani
Picture.1: Mr. Mohammed Al Hashani

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Plastic Pipes Conference 2017 - get-together

From 23 - 24 November 2017 the “Plastic Pipes Conference” took place at the “Leela Mumbai Hotel” in Mumbai, India.

The conference provides a comprehensive overview of the latest material, technology, business trends and applications in the plastic field. Over 350 delegates listened to presentations and lectures from 25 speakers who are leaders in the field of plastic pipes. One of those was our technical sales representative Jochen Blickheuser. He introduced the Krah Pipes technology to those listening and focused on the importance of plastic pipe systems in the near future, because “the worldwide demand for plastic pipes is expected to grow more than 5% annually until the year of 2019”. Many third-world countries also concentrate more and more on plastic pipes, since they are simply more efficient, easy to handle and have a good UV resistance which is essential in African and Asian developing countries.

Our representative Jochen holding a presentation about the Krah Pipes Technology
Picture 1: Our representative Jochen holding a presentation about the Krah Pipes Technology

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FAQ - Frequently asked questions by YOU

This is the second part of our “Frequently asked questions” section (click here to view part one of our FAQ). In every issue we will answer some of the most asked questions we get from potential customers and interested parties about the Krah Technology.
Also feel free to send us some new ideas for our FAQ in he form below. We will try to publish as many as we can.

Q: What is the stiffness of Krah manholes?
The minimum stiffness is defined as SN2 in EN13598. Further all other stiffness classes can be manufactured if required and necessary!
Q: Can Krah pipes resist inner pressure?
Yes, due to the tailormade design any Krah pipe provides a certain solid waterway wall-thickness for the requested inside pressure.
Q: What is the maximum size and height for Krah manholes?
Typical Krah manholes are used in a maximum depth of 10-12 m. For bigger depths Krah recommends the telescopic manhole design which is used for landfill application as well. The biggest manhole diameter is DN/ID 5000 mm.
Q: What kind of fittings do the Krah system povide?
Krah fittings are manufactured in the Krah factory. All necessary fittings and even customized design can be manufactured: bend, elbow, stub-end, flanges, reducers, T-branches, Y-branches etc.

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