How many radiographs does API 653 require for vertical joints of new shell plates to existing shell plates?

How many radiographs does API 653 require for vertical joints of new shell plates to existing shell plates?

• A. One radiograph shall be taken in each fifty foot length
• B. One radiograph shall be taken in each twenty-five foot length
• C. One radiograph shall be taken in each joint
• D. One radiograph shall be taken in every other joint

Answer: (C)

The requirement that one radiograph shall be taken for each joint of vertical joints between new shell plates and existing shell plates is derived from the need to ensure the integrity and quality of the welds. Each joint is a critical point where the materials are connected, and radiographic inspection provides an effective means to detect any defects or discontinuities that could compromise the structural integrity of the tank. This meticulous approach is essential for maintaining safety and reliability in storage tank construction. By requiring a radiograph for each individual joint, API 653 emphasizes the importance of thorough inspection practices to prevent potential leaks and failures, which could have serious environmental and safety implications. The other options, while considering intervals, do not adequately address the necessity of a complete inspection for every joint, which can vary in quality and characteristics.

The requirement that one radiograph shall be taken for each joint of vertical joints between new shell plates and existing shell plates is derived from the need to ensure the integrity and quality of the welds. Each joint is a critical point where the materials are connected, and radiographic inspection provides an effective means to detect any defects or discontinuities that could compromise the structural integrity of the tank. This meticulous approach is essential for maintaining safety and reliability in storage tank construction.

By requiring a radiograph for each individual joint, API 653 emphasizes the importance of thorough inspection practices to prevent potential leaks and failures, which could have serious environmental and safety implications. The other options, while considering intervals, do not adequately address the necessity of a complete inspection for every joint, which can vary in quality and characteristics.