What type of joints should not be used for uncoated threaded socket welded joints?

The use of uncoated threaded socket welded joints should be avoided in situations where crevice corrosion can occur. Crevice corrosion is localized corrosion that happens in confined spaces or crevices where water and other corrosive chemicals can become trapped. When using uncoated metals, particularly in environments where moisture or corrosive substances may be present, the risk of corrosion increases significantly. If these types of joints are utilized in areas prone to creating crevices, the integrity of the joint could be compromised, leading to potential leaks or failures.

In contrast, while high-pressure systems, above-ground applications, and flexible tubing may present their own challenges, the primary concern regarding crevice corrosion specifically highlights the vulnerabilities associated with uncoated threaded socket welded joints. Thus, preventing crevice corrosion is critical for maintaining the longevity and safety of the joint and the overall system.