27.10.2016

Saerbeck, October 2016

Bending capacity on house connection liners

Or the question: How many bends are possible…?

In the field of land drainage system rehabilitation, bending capacity is one of the main requirements placed on the procedure used. Nowadays, there are a large number of house connection liners available in the market that can pass through bends of up to 90°. It is often the case that several bends in succession have to be passed through in the pipe rehabilitation. This not only poses a challenge in the preliminary work, such as cleaning and inspection, but above all in the rehabilitation of such pipelines. This is why SAERTEX multiCom GmbH, developer and supplier of the GRP house connection liner system SAERTEX multiFlex, is asked time and again: How many bends are possible?

Unfortunately, the experts at SAERTEX multiCom GmbH cannot give a general answer to this question, as a wide variety of factors come into play, such as the old pipe material and the diameter. The following extreme example is therefore used to demonstrate what is currently possible with today's technology:

 

In April 2016, when the company Kress Kanaltechnik from Achern carried out the TV inspection of a house connection pipe in Gaggenau, everyone involved was amazed. The DN150 pipe featured a total of 14 (!) bends over a length of 12.80m. As damage was found over the entire pipeline, the decision was soon made to restore the pipe quickly.

Kress Kanaltechnik accepted this huge challenge. However, the question now arose as to which rehabilitation process should be used for this extreme situation. In this case, the connection pipe also joined on to the main channel without further access points, so it was extremely important that there was no longitudinal strain on the pipe liner used, so as to avoid complex, expensive milling work.

The SAERTEX multiFlex house connection liner was chosen. The SAERTEX multiFlex is the first invertible GRP pipe liner for land drainage systems (dimension range DN100 – DN300). The system features excellent bending capacity, high mechanical properties and resistance to urban and aggressive wastewater, and is DIBt approved. Another key advantage is that no longitudinal strain occurs, even under increased installation pressure, which can become necessary in a chain of bends. In addition, a ResiCap (patent no. 10 2010 002960, IPC F16L55/1645 from resinnovation GmbH) can be installed in the pipe liner in the factory. This enables installation with an open end, without a calibration hose, thus eliminating the risk of the calibration hose becoming stuck in the bend.

 

Thanks to Kress Kanaltechnik's extensive experience working with the SAERTEX multiFlex liner, the damaged pipe could be restored in just one day without complications.

 

Contact

SAERTEX multiCom GmbH
Daniel Wehner
Tel. +49 2574 902-598
d.wehner@saertex.com

 

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