What is the advantage of using welded joints for piping compared to screwed or flanged connections?

Welded joints for piping are often preferred because they provide a continuous, seamless connection that is inherently more efficient for insulation. The absence of gaps or joints found in screwed or flanged connections allows insulation material to be applied more uniformly over the piping. This results in less thermal bridging, which can occur at the connections with other types of joints, leading to improved thermal efficiency. Moreover, the smooth exterior of a welded joint minimizes surface irregularities, making it easier to apply insulation and achieve a tighter fit.

In contrast, other options such as lower cost or simpler installation may not hold true for welded joints, as the welding process often requires specialized skills and equipment, potentially increasing initial costs and complexity during installation compared to some mechanical joints. Furthermore, while welded joints can be designed to accommodate specific flexibility requirements, they generally do not offer the same level of flexibility as flanged connections, which can be easily disassembled for maintenance or adjustment.