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Kelly Hose in Drilling
A Kelly hose (also known as a mud hose or rotary hose) is a flexible, steel reinforced, high pressure hose that connects the standpipe to the kelly (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).

The kelly hose is appended to the goose-neck on the swivel at the top of the oilfield kelly rig. This hose allows free vertical motion like being lifted or loosened while drilling effluents are pumped up through the drill string.
The concurrent lowering of the drill string while controlling the petroleum product release is favorable in sustaining oil drilling activity.

Drilling rotary and vibrator hoses (High Pressure Drilling Hoses) are designed as API 7K Spec as the flexible connection between the standpipe and swivel for pumping mud at a very high pressure in oil drilling and exploration.
This hose features high strength spiral steel wire reinforcement which provides a very flexible connection capable of withstanding high pumping pressures at API working pressures, also called mud hose, cement hose, kelly hose or shock-resistant hose.