What is Kelly Hose ?

Kelly Hose (Also Known As Mud Hose Or Rotary Vibrator / Drilling Hose)

Kelly hose is a high-pressure hose, with flexible steel reinforcements and other features.
The standpipe is connected to the rotating drill pipe or kelly More specifically gooseneck.
Kelly hose support freedom of vertical movement of the drill pipe, While facilitating the flow of drilling fluid down the drill string and through the system.