Why do some manufacturers not tighten fittings during shipping and storage?

Manufacturers often leave fittings loose during shipping and storage to accommodate potential temperature changes. As temperatures fluctuate during transport and storage, materials can expand or contract. Tightening fittings could lead to stress on the connections or components due to expansion, which may cause leaks or other issues over time. By leaving them slightly loose, manufacturers ensure that the fittings can adjust to these changes without compromising the integrity of the connections. This approach helps maintain the longevity and safety of the storage tank systems upon installation.

Other considerations, such as preventing corrosion, reducing shipping costs, or improving visibility, do not directly relate to the need for adjustability due to temperature effects.