The round mandrel slip joint, like other slip joints, accepts the movement associated with ocean heave or temperature change without allowing the movement to disturb the placement of downhole tools.
Features
*Top of the mandrel slip joint has 4 3/4-in. (120.65-mm) drill collar profile for easy handling with the rig elevators and slips
*Maintains its full tensile rating when collapsed and locked
*Can be locked in the closed position for handling, reducing the risk of damage to the lifting/sealing mandrel
*Internally pressure and volume balanced
*String can be picked up with the slip joint locked; the slip joint can then be unlocked before it is run into the hole