How many effective threads does a 2 1/2" diameter screwed steel pipe have?

To determine how many effective threads a 2 1/2" diameter screwed steel pipe has, it’s essential to understand the threading standards used for pipes. According to common standards, particularly those outlined by the American National Standards Institute (ANSI) for pipe threads, the number of effective threads can be calculated based on the pipe's diameter.

For a 2 1/2" diameter pipe, it typically has a specific number of threads per inch determined by its threading type (for instance, NPT - National Pipe Tapered). The standard for 2 1/2" NPT is 8 threads per inch. Given that a standard length of engagement for a threaded joint is typically around 3 inches, you would multiply the number of threads per inch by the length of engagement.

Calculating this:

8 threads per inch × (a common engagement length) = 8 effective threads. This buildup from the cylindrical nature of both the pipe and the fittings creates a robust connection that can handle various pressures.

Choosing the correct option here reflects a good understanding of threading standards and their practical applications in piping systems. Hence, understanding that threaded pipes engage effectively over a segment contributes to selecting the right answer related to the property of effective threads