In heavy ion synchrotrons like SIS 18 high energetic ions can impact on the beam pipe and release gas molecules. This so called ”ion induced desorption” deteriorates the accelerator vacuum and, as a consequence, the beam life time and luminosity. Desorption yields η (released gas atoms or molecules per incident ion) of various materials have been studied at GSI since 2003. A scaling of the deso...

Fully developed turbulent pipe flow at Re=11300 as well as Re=5300 is measured by PIV using water as working fluid. Excellent agreement with DNS (Direct Numerical Simulation) by Satake (2000) is achieved by choosing optimum measurement parameters such as spatial resolution, time separation of two images, and number of samples. The test section is 6.7m long stainless steel pipe with transparent ...

A new D457 × 7.1 X65ERW oil pipeline leaked twice during the pressure test. The two failed pipes belonged to same batch of products from manufacturer. Failure analysis showed that cracks in 1# and 2# cracking propagated outer surface pipe wall inner along weld fusion line. inclusion phase distributed chains zone is speculated be root cause fitness-for-service this steel was analyzed using failu...

The prompt gamma rays emission, following neutron absorptions are characteristics of material under test and its intensity is proportional to amount or thickness of the material. The method is non-contact, and can, therefore, be very useful for scale or corrosion measurement of high temperature or insulated pipes. This method can be used to identify type of scale if it is not known. Neutron fro...