What is the required size of the pipe that must be installed with the drain cock or drain valve in a water column?

The requirement for the size of the pipe installed with the drain cock or drain valve in a water column is generally determined by both the volume of water that needs to be drained and the overall design of the water column system. A 3/4 inch pipe allows for a sufficient flow rate while still being compatible with standard plumbing practices. This size strikes a balance between adequate drainage capacity and practical installation considerations, making it a common choice for such applications in both residential and commercial systems.

In addition to allowing for proper drainage, a 3/4 inch drain valve can facilitate maintenance and prevent clogs more effectively than smaller sizes, ensuring the system operates efficiently. The code and standards typically reference this size for fittings in drainage systems, further supporting it as the acceptable and preferred option.