Patent ID: 11965819
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Measurement (Instruments)
Classification: CPC G  B  C | IPC B  G

Claim 19:
20. A method for determining a threshold value for use in determining whether a post weld heat treatment process is required in a particular industry to avoid stress corrosion failure of an external weld joint on a subject pipe having a wall thickness and applying a post weld heat treatment process if the threshold is exceeded, comprising the steps of:
selecting a representative pipe type that is commonly used in the particular industry, the representative pipe having a longitudinal seam weld, wherein the longitudinal seam weld is not known in the industry to experience stress corrosion cracking failure across a range of industry applications;
measuring a residual stress profile of the longitudinal seam weld;
determining a minimum residual stress value of the measured residual stress profile;
setting the threshold value equal to the determined minimum residual stress value; and
applying a post weld heat treatment process if the threshold is exceeded.