1. When the flaw is not subjected to significant pressure or temperature cycles (greater than 20% of design pressure or 50°F), compare the stress intensity…

1. Obtain appropriate KIC, COD, or J-integral data at ambient and operating temperature by one of the following: a. Testing of samples of the actual…

1. Using the principal membrane and bending stresses calculated above, calculate the stress intensity at the flaw (KI) using the following equation: Mm = correction…

Applied stress at the location of the flaw should be resolved into membrane bending components. All forms of loading (i.e., internal pressure, discontinuity, and thermal)…

1. Determine actual flaw size, configuration, and orientation using ultrasonic examination procedures. 2. Resolve the flaw into a simple shape by completely circumscribing with an…

It is essential to have the following information to perform properly a fitness-forservice analysis: 1. Accurate sizing data for cracks (or other flaws). 2. Toughness…

The concepts of fracture mechanics can be applied to determine if a pressure vessel containing a crack larger than permitted by the ASME Code for…

Technology has been developed, and is still evolving, that can predict if a crack will propagate as a fast fracture at the applied stress resulting…

Indications of cracks are usually of considerably greater concern than corrosion. They predominantly occur at weld joints and may propagate during operation. However, cracks that…

Many of the forms of deterioration that occur in pressure vessels are characterized by the formation of cracks, at least in their terminal stages before…