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

The cleaning of piping and tubing is an important process in ensuring the integrity and functionality of systems in various contexts. During manufacturing, shipping, and construction, contaminants, debris, and residues can accumulate, which necessitates cleaning to prevent issues such as corrosion, blockages, or compromised system performance.

However, after modification, cleaning is typically not required as a standard practice. Modifications often involve adjustments or upgrades that may not introduce the same risk of contamination as manufacturing or construction processes. In fact, if the modification has been carried out properly, it is often expected that the modified sections would already be sufficiently clean or would have been cleaned prior to the modification. This makes cleaning after modification less of a necessity compared to the other stages.