The design of the wet back boiler can be frustrating for Boilermakers due to the limited access to install tubes in the combustion return area of the boiler.

The limited space in wet back boilers makes it necessary to choose alternative methods of tube installation. Depending upon the physical size of the Boilermaker and the power source to drive the repair tools, the tools to complete the task can vary.

One method is to use a reverse mandrel and expand the tubes from the opposite end of the boiler (Part A). This uses an extension and a socket to connect to the expander’s reverse or forward square mandrel. The type of mandrel used will vary depending upon the style of the expander. Reverse type mandrels can be used for flaring and straight rolling tube expanders, whereas, Forward Square mandrels can be used with Combination Roller Beading Expanders.

“The design of the wet back boiler can be frustrating for Boilermakers due to the limited access to install tubes in the combustion return area of the boiler.”

Another method is for Boilermakers of smaller stature to roll from within the Combustion Return Area (Part B). This process requires a right-angle pneumatic motor with a series of short mandrels that can work in the limited space. Sometimes there isn’t enough room for the Combination Beading Tool to even be used. However, a short Beading Hammer and Beading Chisel can be used to accommodate these difficult tubes.

Overall, expanding tubes within a wet back boiler can be difficult if you don’t have the correct tools. As a result, it is important to consider the best tube expansion method for your team before beginning a project in order to get the best results.