To carry out an examination in situ (i.e., examination of the tubes in position, where they are installed), a manhole cover is usually removed to allow a technician access to the tubes. Alternatively, a tube bundle may be removed from a heat-exchanger and transported by forklift to a maintenance area for easier access.
To examine the tubes in their original location (i.e., examination while they are installed), a manhole cover is usually removed to allow a technician access. Alternatively, a tube bundle can be removed from a heat exchanger and moved to a maintenance area by forklift for easier access.