What is another name for a lap-joint flange?

A lap-joint flange is specifically designed to be used with a lap-jointed pipe, where a determining feature is the way it connects seamlessly to the end of a pipe without the need for a welded joint directly on the flange itself. The name "van stone flange" refers to the design of this type of flange, known for having a flat surface that allows a proper fit for the lap-joint pipe.

This type of flange typically includes a stub end, which facilitates easy installation and maintenance, making it especially useful in systems that require regular disassembly. Lap-joint flanges are often employed in piping systems that must be dismantled for cleaning, inspection, or modification. This provides significant advantages in terms of flexibility and ease of use, which is embodied in the van stone design.

The other choices refer to different types of flanges used in piping systems, each designed with specific properties and applications in mind, which do not align with the characteristics of lap-joint flanges. The term "van stone flange" is more accurately associated with the lap-joint type, highlighting the design intent and functionality.