How many threads approximately will be cut on a 3-inch steel gas line?

To determine how many threads will be cut on a 3-inch steel gas line, we need to understand the standard threads per inch used for pipe threads, specifically for steel gas lines.

Steel gas lines typically use the National Pipe Thread (NPT) standard, which specifies a certain number of threads per inch based on the nominal size of the pipe. For a 3-inch nominal steel pipe, the standard is approximately 8 threads per inch.

To find out the total number of threads for a 3-inch length, you multiply the length by the number of threads per inch. If we assume that the length used for threading is close to the total length of the 3-inch pipe, the calculation would be as follows:

3 inches (length of the pipe) x 8 threads/inch (standard for 3-inch pipe) = 24 threads total.

However, when threading a pipe, the actual length where threads are cut may be less than the total length due to factors such as the taper and design of the fitting or termination. Generally, the usable length for threading could be less than the full three inches, thus resulting in a reduced number of threads. Choices given may range from 10 to 13, indicating that the final number