What is the size of the pipe typically used for a gauge cock connection?

The standard size of pipe typically used for a gauge cock connection is 1/2 inch. This size strikes a balance between providing adequate flow for accurate pressure readings while minimizing the risk of being too large, which can lead to issues like sluggish response times or difficulty in accessing the gauge. Gauge cocks are installed on pressure vessels and boilers to allow for the safe monitoring and testing of pressure without needing to open the system to the atmosphere, and the use of a 1/2 inch connection has been proven effective in maintaining operational efficiency and safety standards.

Other sizes may be technically feasible, but they are not standard practice for these connections. A smaller size could impede proper gauge function, while a larger size could complicate installation and potentially introduce hazards if not properly managed. Consequently, the choice of a 1/2 inch gauge cock connection is widely accepted in the industry.