New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is a key advantage of using a spectacle blind compared to a line blind?

1. It is lighter

2. Can be rotated avoiding space left in the line

3. More cost-effective

4. It takes less time to install

The correct answer is: Can be rotated avoiding space left in the line

A spectacle blind offers the significant advantage of being able to rotate, which allows for a seamless transition to an open or closed position, effectively eliminating any gaps in the pipeline when it is in the open position. This is particularly useful in systems where maintaining a continuous flow is essential, as it prevents fluid loss or contamination that a line blind might allow due to potential gaps when transitioning between open and closed. In contrast, while factors like weight, cost, and installation time may vary between different types of blinds, they do not provide the same operational benefits as the ability to rotate. This unique functionality of the spectacle blind is what makes it a preferred choice in many scenarios where both safety and efficiency are priorities.