Boiler tubes are measured by what dimension?

The dimension by which boiler tubes are typically measured is the outside diameter. This measurement is crucial because it provides information about how the tube can fit into a system, connecting with other components, and it influences the flow characteristics of the medium passing through. Additionally, measuring the outside diameter helps in ensuring compatibility with fittings and insulation requirements.

Inside diameter can provide insights into the flow capacity, while thickness affects structural integrity and heat transfer, but the standardized measurement for identifying and specifying boiler tubes is the outside diameter. Length is also relevant but does not provide a complete assessment of a tube's interaction with its environment and fittings. Therefore, understanding that the outside diameter is the key measurement helps technicians ensure proper installation and performance of boiler systems.