What inspection methods should be used for vessel internal piping?

The selection of visual testing (VT) and hammer testing for inspecting vessel internal piping is appropriate because these methods effectively identify surface defects and assess the overall condition of the piping. Visual testing is a fundamental method that allows inspectors to examine the external surfaces for signs of corrosion, cracks, or other visible deterioration. This method can be applied in various conditions and is often used as a first step in the inspection process.

Hammer testing, on the other hand, helps detect delaminations and other localized damage by listening to the sound produced when the surface is struck. A solid area will produce a different sound compared to a delaminated area, allowing inspectors to identify potential concerns with the integrity of the material.

Using these two methods in tandem provides a comprehensive assessment of the internal piping, addressing both visual and structural integrity within a pressure vessel, ensuring that any issues are identified before they pose a risk to safety or functionality.