David J Norman

US Patent:

20080032152, Feb 7, 2008

Filed:

Aug 4, 2006

Appl. No.:

11/499800

Inventors:

Glen A. Vaughn - Ozark MO, US
Narasimha-Rao Venkata Bangaru - Pittstown NJ, US
Jayoung Koo - Somerset NJ, US
Raghavan Ayer - Bernards Township NJ, US
Danny L. Beeson - Houston TX, US
Neeraj S. Thirumalai - Phillipsburg NJ, US
David A. Baker - Bellaire TX, US
David A. Norman - Houston TX, US

International Classification:

B32B 15/00

US Classification:

428615

Abstract:

The use of laser shock processing in oil & gas and/or petrochemical applications is provided by the present invention. The use includes subjecting friction stir weldments, fusion weldments, and other critical regions of ferrous and non-ferrous alloy components used in oil & gas and petrochemical applications to laser shock processing to create residual compressive stresses near the surface of the treated area. The residual compressive forces in the ferrous or non-ferrous components improve properties including, inter alia, is surface strength, fatigue life, surface hardness, stress corrosion resistance, fatigue resistance, and environmental cracking resistance. Laser shock processing finds particular application in high strength pipelines, steel catenary risers, top tension risers, threaded components, liquefied natural gas containers, pressurized liquefied natural gas containers, deep water oil drill strings, riser/casing joints, and well-head equipment.

US Patent:

20080032153, Feb 7, 2008

Filed:

Dec 21, 2006

Appl. No.:

11/643526

Inventors:

Glen A. Vaughn - Ozark MO, US
Narasimha-Rao Venkata Bangaru - Pittstown NJ, US
Jayoung Koo - Somerset NJ, US
Raghavan Ayer - Bernards Township NJ, US
Danny L. Beeson - Houston TX, US
Neeraj S. Thirumalai - Phillipsburg NJ, US
David A. Baker - Bellaire TX, US
David A. Norman - Houston TX, US
Steven J. Ford - Missouri City TX, US
Douglas P. Fairchild - Sugar Land TX, US

International Classification:

B32B 15/00

US Classification:

428615

Abstract:

The use of friction stir and laser shock processing in oil & gas and/or petrochemical applications is provided by the present invention. The use includes subjecting friction stir weldments, fusion weldments, and other critical regions of ferrous and non-ferrous alloy components used in oil & gas and petrochemical applications to laser shock processing to create residual compressive stresses near the surface of the treated area. The residual compressive forces in the ferrous or non-ferrous components improve properties including, inter alia, surface strength, fatigue life, surface hardness, stress corrosion resistance, fatigue resistance, and environmental cracking resistance. Friction stir and laser shock processing find particular application in high strength pipelines, steel catenary risers, top tension risers, threaded components, liquefied natural gas containers, pressurized liquefied natural gas containers, deep water oil drill strings, riser/casing joints, and well-head equipment.