Abstract
Creep behaviour of X20 (12Cr-1MoVNi) steam piping subjected to a typical operating pressure of 18 MPa and temperature of 550 °C have been investigated using finite element analysis code, Abaqus and fe-safe/Turbolife software. User subroutine script for the modified hyperbolic sine creep model used was developed in Fortran and implemented in Abaqus. The maximum creep stress and strain were developed on the intrados of the elbows in the piping network. The maximum creep stress and minimum creep rate were obtained after an hour of operation and the stress was observed to relax with increase in operational time while the creep strain increases with time. Under the specified operating conditions, the steam pipe is expected to survive a useful creep life of 15.3 and 16.9 years with corresponding maximum creep damage of 7.479×10-6 and 7.479×10-6 for machine-finished and fine machine-finished steam pipe surfaces respectively. Lastly, strong correlation exists between the numerically simulated and analytically computed creep strain rate at the straight region of the piping.
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