Development of plastic deformations in steel under constant load and their importance for practice in the gas industry
The contribution presents and discusses the results of experimental research into low-temperature creep of L360NB+N gas pipe steel.
The experiment was conducted on flat rods made of a straightened pipe ring, which was cut off a longitudinally welded Ø 530/8 mm pipe.
The results have made it possible to describe the relationship between creep deformation and time and applied stress, and then determine the variations in the decrease in the pressure of water in the pipe following its loading to a certain pressure, for example, tests of pipe tightness.
The updated TPG 702 04 standard is envisaged to use the derived mathematical relationships for specifying more accurately the values of the natural drop in water pressure in piping.
Read more in the article Development of plastic deformations in steel under constant load and their importance for practice in the gas industry (PDF, Czech language, 1955 kB).