What is the internal diameter (ID) of instrument piping?

The internal diameter (ID) of instrument piping is typically standardized based on the specifications and requirements of various applications. In this case, the selection of 0.36 inches reflects a common size used in many instrumentation applications. This diameter allows for effective flow of the fluids being measured or controlled, while also accommodating the need for sensitivity and response time in instrumentation.

Piping for instruments needs to strike a balance between physical dimensions and the operational needs of the system. A diameter of 0.36 inches can effectively facilitate the flow of gases and liquids through the system, ensuring that the instruments provide accurate measurements without the risk of blockage or excessive pressure drop. This size is often chosen for its efficiency in providing a good response time for instruments that require quick readings, allowing for more precise and timely control within the system.

In the context of the other options, while they represent various sizes of piping, they do not typically align with standard practice for instrument piping, which often favors the selection of 0.36 inches for an optimal balance of performance and efficiency.