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WHY PA-U12 HIGH PRESSURE PIPES DO NOT CARE ABOUT “ROCK ́N ́ SHARD” IN VIEW OF PAS 1075

 

Hermann van Laak, Jan Heimink, Mario Messiha, Andreas Frank, Christoph Bruckner, Thomas Kratochvilla

# 2021 Amsterdam

For high pressure pipes above maximum operation pressure of 10 bar, this paper emphasizes PA-U12 as the easy to install alternative to steel. It underlines the superb performance of PA-U12 pipes for alternative installation techniques without need for a separate mechanical protection. An unplasticized polyamide 12 (PA-U12) pressure pipe compound was investigated by following PAS 1075 test principals and further modification of established and new small-scale accelerated reliable test (SMART) methodologies. The outstanding high combined resistance against external scratches from rocks after horizontal direct drilling (HDD) and against slow crack growth (SCG) as well as against penetration of shards (sharp fragment) of a cast iron pipe after burst lining is demonstrated. It is concluded that PA-U12 pressure pipes are suitable for alternative installation techniques without an additional outside mechanical protection even in presence of rocks ́n ́ shards. Furthermore, SMART methodologies, such as slightly modified Cyclic Cracked Round Bar (CRB) and the Strain Hardening (SH) tests allow an outlook on a first draft for a potential standardization concept for PA-U12 in trenchless installation techniques.

Related keywords : polyamide 12, MOP 18 bar, gas piping systems, alternative installation, PAS 1075, cracked round bar test, strain hardening test, slow crack growth.
Please note that the whole article content is available on PPCA website only


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