Time-saving and reliable

Point Loading Test (PLT)

The Challenge

Significant advances have been made over the last few years in optimising
PE’s susceptibility to stress cracking, particularly with regard to pressure
pipes. Pipes with PE 100-RC (resistant to crack) qualities are suitable for
alternative installation techniques (trenchless and sand bed-free installation).
The point load test in accordance with PAS 1075 represents a key test method
for ensuring the quality of materials and pipes.

Due to the fact that a corresponding tester was not commercially available when
PAS 1075 was introduced, the Kunststoff-Zentrum (SKZ) Würzburg and IPT
Institut für Prüftechnik Gerätebau GmbH & Co. KG decided to work together
on a joint development project. The objective was to develop (IPT) and then validate and optimise (SKZ) a suitable point load tester.

Point Loading Test (PLT)

The point load test on the pipe simulates an installation situation in which the pipe is disturbed by the external influence of a point load, such as stones or sharp-cornered objects.
The test procedure is similar to the internal pressure creep test, with the difference being that an external point load (generally a punch) is also applied before the internal pressure. To accelerate the test further, a wetting agent solution is applied to the test sample.

The test unit

The new test unit offers a range of functions and special care has been taken in the design to optimally fulfill the requirement of this standard. 3 pipes with a diameter of between 32 and 160 mm can be tested simultaneously.

Outlook

With this new test method, optimized test parameters (temperature and load) and
by utilization of aggressive wetting agents the test times for PE 100-RC can be reduced from a year to less than 1000 hours.

 

Interesting additions


Project informations:

Project management

Anton Neukäufer - IPT Institut für Prüftechnik Gerätebau GmbH & Co. KG
Dr. Mirko Wenzel - SKZ - KFE gGmbH


Sponsored by the Federal Ministry for Economics and Technology

The project KF2012522 is sponsored in the frame of the Central Innovation Program for Mid-Sized Companies (ZIM) by the Federal Ministry for Economics and Technology on the basis of a resolution of the Federal Assembly.