The required bell when belling boiler tubes larger than 2 inches OD is not less than 1/8" and not more than how many inches?

The requirement for the bell when belling boiler tubes larger than 2 inches outside diameter specifies that it should not be less than 1/8 inch and should not exceed 3/16 inch. This establishes a clearly defined range for the bell dimension, ensuring it is adequate for the proper functioning and safety of the boiler system.

The key consideration in this scenario revolves around maintaining a functional and reliable seal between the belling and the tube, as well as ensuring compatibility with the fittings and other components involved in the boiler systems. A bell that is too wide could compromise the joint integrity, while one that is not sufficiently broad may not provide the necessary clamping effect. Hence, 3/16 inch is the maximum limit set by regulations to maintain this balance of safety and functionality in industrial and maritime applications.