When disassembling an exchanger with a fixed head bundle, what should be done first?

When disassembling a heat exchanger with a fixed head bundle, the first step should be to remove the channel head. This step is essential because the channel head houses the inlet and outlet connections to the heat exchanger and allows access to the internal components. By removing the channel head first, you create the necessary space for safely accessing and handling the bundle.

Removing the channel head enables you to release any pressure and ensure that liquid or gas does not escape unexpectedly during disassembly. It also allows for a clear line of sight and easier manipulation of the other components of the exchanger, including the removal of the bundle itself, which can be a cumbersome task.

Other options may seem like viable steps but do not prioritize safety or proper procedure. For example, loosening all bolts is important but should follow the removal of the channel head to prevent misalignment or damage. Likewise, wedging open the flanges can lead to complications if done prematurely without first addressing the channel head. Therefore, starting with the channel head sets the proper stage for a safe and effective disassembly process.