What is the required number of threads for effective jointing of 2 1/2 inch diameter screwed steel pipes?

The effective jointing of 2 1/2 inch diameter screwed steel pipes generally requires a specific number of threads to ensure a secure and leak-proof connection. In the case of 2 1/2 inch pipes, the standard practice is to utilize eight threads to achieve this proper joint. This number helps to ensure that the connection is not only strong but also minimizes the risk of failure under pressure.

Using eight threads allows for enough surface area and provides sufficient grip between the pipes, which is crucial for maintaining the integrity of the joint and accommodating any thermal expansion or contraction that may occur during operation. This ensures that the connection holds firm and effectively prevents leaks or breaks in the system, especially in high-pressure applications.

The other choices of threads do not meet the standard requirement, and using fewer threads may compromise the strength and reliability of the joint.