What type of insulation will allow for the ready detection of leaks in CHT piping?

Lagging insulation is the correct choice because it is typically installed in a way that permits access to the piping underneath. This feature allows for visual inspection, making it easier to detect any leaks that may occur within the CHT piping system. Unlike other insulating materials, lagging is often removable or can be designed with built-in access points, which facilitates monitoring the condition of the piping.

Foam insulation, fiberglass insulation, and spray-on insulation do not offer the same level of accessibility for leak detection. Foam insulation commonly is applied directly to the pipe surface, making it challenging to check for leaks without removing the insulation entirely. Fiberglass insulation, while effective for thermal resistance, can also obscure the piping and does not provide an easy way to inspect for leaks. Spray-on insulation creates a seamless barrier, which makes it difficult to detect leaks without significant intrusion. Therefore, lagging is preferred in this context for its practical benefits in monitoring the condition of CHT systems.