How and to what extent are new welds for tank bottom plates required to be examined?

How and to what extent are new welds for tank bottom plates required to be examined?

• A. Newly welded bottom joints shall be tested their entire length using liquid penetrate
• B. Newly welded bottom joints shall be tested their entire length using a vacuum box and a solution film, or a tracer gas and detector
• C. Newly welded bottom joints shall be tested their entire length using visual examination
• D. Newly welded bottom joints shall be tested their entire length using wet fluorescent magnetic particle examination

Answer: (B)

The correct response highlights the specific testing requirements for newly welded bottom joints of aboveground storage tanks. Newly welded bottom joints must be tested the entire length using a vacuum box and a solution film, or a tracer gas and detector, because these methods effectively identify leaks and imperfections that could compromise the integrity of the tank. Using a vacuum box combined with a solution film allows for the detection of small leaks by creating a vacuum and observing for bubbling in a liquid film. Similarly, employing a tracer gas along with a detector provides a sensitive method for identifying leaks during the testing of welded joints, ensuring thorough examination of the weld quality. This comprehensive testing is crucial because welded joints are critical areas for potential failure in storage tanks due to the stresses and environmental factors they encounter. Proper examination mitigates risks, ensuring the safety and reliability of the storage tank operation. The other methods mentioned in the incorrect options, while important in their contexts, do not provide the same level of thoroughness for detecting possible leaks or defects in newly welded joints. Visual examination alone, for instance, can miss internal flaws, while using liquid penetrant methods or magnetic particle examination may not be as effective in assessing the integrity of welded joints in this specific application.

The correct response highlights the specific testing requirements for newly welded bottom joints of aboveground storage tanks. Newly welded bottom joints must be tested the entire length using a vacuum box and a solution film, or a tracer gas and detector, because these methods effectively identify leaks and imperfections that could compromise the integrity of the tank.

Using a vacuum box combined with a solution film allows for the detection of small leaks by creating a vacuum and observing for bubbling in a liquid film. Similarly, employing a tracer gas along with a detector provides a sensitive method for identifying leaks during the testing of welded joints, ensuring thorough examination of the weld quality.

This comprehensive testing is crucial because welded joints are critical areas for potential failure in storage tanks due to the stresses and environmental factors they encounter. Proper examination mitigates risks, ensuring the safety and reliability of the storage tank operation.

The other methods mentioned in the incorrect options, while important in their contexts, do not provide the same level of thoroughness for detecting possible leaks or defects in newly welded joints. Visual examination alone, for instance, can miss internal flaws, while using liquid penetrant methods or magnetic particle examination may not be as effective in assessing the integrity of welded joints in this specific application.