Method for Subsea Equipment Subject to Hydrogen Induced Stress Cracking

Abstract

Systems and methods for generating transfer functions associated with calculating local stresses on pipe elements by post processing forces and moments of a pipe model representing the piping system. The transfer functions are reusable and allow recalculation with different sets of user data without requiring regeneration of the transfer functions.

1 .- 7 . (canceled) 
     
     
         8 . A method for generating a transfer function for predicting local stresses on a subsea piping system element, the method comprising:
 (a) determining a three-dimensional model for said subsea piping system element;   (b) iteratively running said three-dimensional model with a plurality of pipe geometric dimensions and loads and generating a series of component transfer functions describing local stress associated with said subsea piping system element; and   (c) summing said series of component transfer functions to generate said transfer function.   
     
     
         9 . The method of  claim 8 , wherein said pipe loads comprise moments and forces. 
     
     
         10 . The method of  claim 8 , wherein said geometric dimensions comprise said subsea piping system element inner radius and outer radius. 
     
     
         11 . The method of  claim 8 , wherein said local stress comprises hoop stress and radial stress. 
     
     
         12 .- 20 . (canceled)