A
kelly hose (also known as a
mud hose or
rotary hose) is a flexible, steel reinforced, high pressure hose that connects the
rig standpipe to the
Kelly drive (or more specifically to the goose-neck on the swivel above the kelly) and allows free vertical movement of the kelly while facilitating the flow of
drilling fluid through the system and down the
drill string.
The
Kelly hose has a diameter of 3-5 inches (inside diameter).
