Abstract: Disclosed is a wellhead that includes a casing head, a tubing hanger and a rotation assembly connected to the tubing hanger. The tubing hanger is rotatable relative to the casing head and this rotation is effected by the rotation assembly. Also disclosed is a centraliser for use with tubing in a well. The centraliser has a first sleeve, a second sleeve, and a body that has a first band and a second band connected by a number of resiliently deformable members. The bands extend about the sleeves, with the bands being able to move relative to the respective sleeves. This can permit the centraliser to be fitted to tubing without requiring tight tolerances of tubing size, for example, and may reduce the friction between the body and the tubing to allow the tubing to be rotated within the casing during use.

Abstract: A side tipper system for a vehicle includes a container for carrying material and selectively discharging carried material. The container includes a container body defining an upper portion of a first side wall, a second side wall opposing the first side wall, and a pair of opposing end walls; a floor pivotally coupled to the second side wall; and a side door pivotally coupled to the floor and defining a lower portion of the first side wall in a closed position and forming a discharge opening in an open position. The system further includes end assemblies configured to be mounted to a vehicle chassis at respective ends of the container, each end assembly operatively coupled to the container for supporting the container and for controlling discharge of material by: moving the side door from the closed position to the open position; and lifting the container body relative to the chassis.