What does the procedure specification say about the lineup clamp?

The procedure specification states that the lineup clamp can be either internal or external. This aspect is critical as it provides flexibility in how the clamp is applied during the welding process. The choice of an internal versus an external clamp may depend on various factors, such as the specific joint configuration or the accessibility of the area being welded. Each type has its advantages, with internal clamps often providing better alignment for certain joint types and external clamps being easier to inspect and handle in some configurations.

The other choices do not correctly encompass the relevant information about the lineup clamp as provided in the procedure specifications. While it may be true that certain applications or practices discuss the use of clamps specifically on fillet joints or that clamps are an important part of the overall procedure, the most accurate and encompassing answer is that the clamp can be designed for internal or external use. Thus, recognizing this versatility is important for proper welding practices in pipeline and facility construction.