When is it acceptable to remove the channel head of an exchanger?

The practice of removing the channel head of a heat exchanger is an important step in maintenance or repair procedures. It is crucial to ensure that all necessary precautions and steps are taken to maintain safety and integrity during the process.

In this context, the correct answer emphasizes that the channel head can only be removed after loosening all bolts. This step is essential because loosening the bolts allows the channel head to detach safely from the body of the heat exchanger without causing damage to either component. It also helps to relieve any potential pressure buildup and ensure that seals or gaskets do not sustain damage from sudden movement or pressure differences.

Additionally, removing the channel head before ensuring all bolts are appropriately loosened could lead to uneven stress or potential accidents, as the channel head might still be partially secured. Ensuring that all bolts are loosened creates a controlled environment for effectively and safely lifting the bundle afterward. Therefore, adhering to this procedure provides a structured approach to maintaining equipment safety and functionality.