Gas Heat ESCO Practice Exam

You are installing 1/2" and 3/4" black iron pipe to a natural gas furnace. What is the approximate number of threads to cut?

1. 5-7

2. 8-10

3. 11-13

4. 14-16

The correct answer is: 5-7

When installing black iron pipe for a natural gas furnace, it is essential to ensure a proper seal for safety and efficiency. The number of threads cut on black iron pipe is critical for creating a secure connection. In this case, the approximate number of threads to cut for 1/2" and 3/4" black iron pipe would fall into the 5-7 range. This range allows for enough threads to form a tight seal without excessive threading that could potentially weaken the connection. Therefore, option A, 5-7, is the correct choice for the approximate number of threads to cut for this scenario.