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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.

Kelly Hose Inches
The Kelly hose has a diameter of 3-5 inches (inside diameter).

Tube: NBR, specially compounded for handling abrasive, corrosive and oily drilling mud

Reinforcement: Multiple layers of polyester cord over tube, high tensile steel cables.

Kelly Hose Cover
Cover: NBR, Specially compounded, resistant to abrasion, corrosion, cutting, gouging, oil and weather.

Fitting: Hammer Unions, API Male End, Flanges
Applicable Standard: API Spec 7k/ISO14693

Application: Flexible Connection between standpipe and swivel(Rotary Drilling) or between pump and standpipe(Rotary Vibrator) for pumping mud at extra high pressure in oil drilling and exploration work.