The thread length for a 2 1/2 inch metallic gas pipe is which of the following?

The thread length for a 2 1/2 inch metallic gas pipe is which of the following?

• A. 1/2 inch
• B. 1 inch
• C. 1 1/2 inches
• D. 2 1/2 inches

Answer: (C)

In gas piping, the threaded portion of a pipe is the section that screws into a fitting to make the joint. The length of those threads isn’t the same for every pipe size; there are standard values that ensure enough engagement for a proper seal without unnecessarily long threading. For a 2 1/2 inch metallic gas pipe, the standard threaded length is 1 1/2 inches. This provides sufficient threads to seat the fitting and develop a tight, leak-free connection, while keeping the threading practical and consistent with common fittings used in gas systems. Longer threads beyond this on a pipe of this size aren’t required for typical fittings, and shorter threads wouldn’t leave enough engagement to form a reliable seal.

In gas piping, the threaded portion of a pipe is the section that screws into a fitting to make the joint. The length of those threads isn’t the same for every pipe size; there are standard values that ensure enough engagement for a proper seal without unnecessarily long threading. For a 2 1/2 inch metallic gas pipe, the standard threaded length is 1 1/2 inches. This provides sufficient threads to seat the fitting and develop a tight, leak-free connection, while keeping the threading practical and consistent with common fittings used in gas systems. Longer threads beyond this on a pipe of this size aren’t required for typical fittings, and shorter threads wouldn’t leave enough engagement to form a reliable seal.