Cleaning of piping and tubing is generally required after all of the following except?

Prepare for the Instrument Fitter Test with comprehensive questions and detailed explanations. Sharpen your skills for the exam!

Cleaning of piping and tubing is essential in various stages due to the potential presence of contaminants that can interfere with system performance. During manufacturing, for instance, residues from machining processes or protective coatings can remain on the surfaces, necessitating a thorough cleaning before installation or use. Similarly, during construction, dust, debris, and other contaminants can accumulate, making it crucial to clean the pipes and tubing to ensure they function effectively.

In the modification phase, changes made to existing systems often involve cutting into, welding, or joining pipes and tubes, which can introduce debris or contaminants. Cleaning is necessary here to prevent any obstruction or malfunction when the system is put back into operation.

In contrast, during shipping, the piping and tubing are typically sealed and protected to prevent contamination. Therefore, they often do not require cleaning prior to installation, as long as they have not been exposed to external elements. This makes the cleaning requirement after shipping the exception among the options provided.