New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

A van stone flange is commonly referred to as what type of flange?

1. Blind joint flange

2. Lap-joint flange

3. Socket weld flange

4. Welding neck flange

The correct answer is: Lap-joint flange

A van stone flange is commonly referred to as a lap-joint flange due to its design and function. The lap-joint flange features a design where the flange is made to fit over the end of the pipe, allowing for easy connection without the need for precise alignment with the pipe. This is particularly advantageous in situations where the pipe may need to be frequently disconnected or reconnected, as it facilitates easier assembly and disassembly. Additionally, lap-joint flanges are often used in applications where the pipe is going to be subject to thermal expansion or contraction, as the loosening and retightening do not put stress on the joints compared to other types of flanges, such as welding neck flanges that are more rigidly fixed to the pipe. A van stone flange allows for a smooth transition between the flange and the pipe due to its design, which makes it ideal for joining pipes that may need to be altered or replaced. This combination of features highlights why the term lap-joint flange is fitting for a van stone flange.