UPS Mechanical Craft Practice Test

To determine if an exchanger has a pull-through floating head before disassembly, comparing the diameter of the shell and the bell head is an effective method. In exchangers with a pull-through floating head design, the diameter of the shell typically aligns with or is very similar to the diameter of the bell head. This is a key indicator of the type of head that is used in heat exchangers, particularly because the floating head allows for thermal expansion and easy maintenance.

In contrast, other methods such as checking the color of the shell, inspecting the temperature gauge, or looking for markings may not provide definitive information about the specific design of the floating head. The shell's color is often uniform across different designs and doesn’t indicate the floating head configuration. Inspecting the temperature gauge can give insights into operating conditions but does not directly inform you about the exchanger’s structural features. Additionally, while equipment may have markings that indicate the manufacturer or service specifics, they may not specify the type of head design present.