Page 389 - Pipelines and Risers
P. 389
358 Chapter 19
A period of seven years elapsed before Ruhrgas AG in Germany began in 1992 to place an
order for linepipe for the construction of the world’s first ever grade X80 pipeline.
The 260 km 48-inch Ruhrgas pipeline from Schliichtern to Werne in Germany was designed
and built entirely to X80 capabilities and requirements. This pipeline, installed in 1992-1993,
connects existing pipelines in new federal states in the former East Germany and started
operations in late 1993. Considerable information has been published about this pipeline (Graf
(1993), Chaudhari et al. (1995) and Behrens et al.).
Europipe GmbH, Ratingen, Germany, supplied the entire linepipe for the project. The
material, specified as GRS 550 TM by Mannesmannroehren-Werke AG (MRW), Muelheim,
Germany, has a specified minimum yield stress (SMYS) of 550 Nmm-’ and a minimum
tensile strength of 690 Nmm-2. The comparable API 5L X80 grade has an SMYS of 551
Nmni’ and a minimum tensile strength of 620 Nmm-’.
