On a power boiler, what is the minimum connecting pipe size to be used between the water column and the steam drum?

The minimum connecting pipe size between the water column and the steam drum on a power boiler is specified as 1 inch. This size is critical because it ensures adequate flow and reduces the risk of water hammer and other issues that can arise from insufficient pipe diameter. A larger pipe can help to prevent pressure drops, allowing for proper steam and water separation, which is vital in maintaining the overall efficiency and safety of the boiler system. Proper sizing also supports effective communication between the steam drum and water column, enabling accurate level monitoring and control, which are essential for safe operation.

The options reflecting smaller sizes such as ½ inch are too small to facilitate the necessary flow. Sizes larger than 2 inches may also be excessive for most standard applications, leading to unnecessary material costs and potential complications during installation and operation. Therefore, 1 inch strikes a balance between functionality and adherence to code requirements for safe boiler operation.