Product Description

When the drill pipe is added to increase the depth of the hole, the buckle is now loosened at the lower end of the saver sub instead of the kelly end, which is the most valuable   in the   drill string. This means that the upper threaded connections of the protection   joints and kelly pipe are rarely used and wear is minimal, while the lower threaded connections are used in almost all cases, and most wear is transferred from the rotary head connection to the cheaper protection joints, which are consumable and reduce costs.