We find only very rough data for any technical requirements and for pressure application, just a simple comment stating that this matter has to be agreed between producer and user was sufficient.įrom the beginning this standard DIN 16961 is considered as a general standard, open for all applications. Further, in the first issue of 1977, the diameter range was smaller and concentrated on ID pipes only. Still today many professionals worldwide prefer that test-procedure with constant load and 24 hour testing-time and that is the reason why it is still a major element of current issue of August 2018. In this old standard we can find already defined ring stiffness classes SR 24 - measured over 24 hours with the argument to reduce the spread of test results. The company Krah was 1977 just 9 years old and in beginning of an impressive development! Nevertheless, it was a very useful and helpful standard during that time.Ī time, where still Polyethylene of first generation was used for pipes – not comparable with the modern, bimodal Polyethylene of third generation of nowadays! Part 1 “dimensions” had only 3 pages and part 2 “general quality requirements, test methods” had only 4 pages. If we would have the chance to look into the old standard, we would find that in few pages only the basics are described. The first edition had already been published in September 1977 and it was one of the first standards for plastic pipes. The German standard DIN 16961 for thermoplastic pipes with profiled wall structure is looking back to a long and successfully history.
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