Abstract: The invention contemplates removable end-closure structure for sealed application to the end of a pipe of given outside diameter for hydrostatic pressure-testing the pipe. In the form disclosed, a circumferential wedge clamp is applied to the outer surface of the pipe end to be closed; a closure plate is applied in axial abutment with the pipe end; and a hydraulic flat jack is interposed between the closure plate and an outer reference or backing plate having circumferential connection to the wedge clamp. All parts may be in unit-handling relation, even when not mounted to a pipe end.

Abstract: The invention contemplates a pipe-bending technique wherein an arcuate die which determines the course of bending the central axis of the pipe relies solely upon two tangentially engaging developing lines of contact which are spaced equally, at opposite offsets from the radial plane in which the pipe axis is bent. For the case of pipe bending to a circular arc, the opposed die faces are generally conical, and there is no pipe contact with the die in the range between the spaced developing lines of tangential contact.

Abstract: The invention contemplates portable apparatus for use in hot-bending of tubular pipe, comprising a rigid triangular frame of connected legs wherein a forming-die platform is located near one corner of the frame, along with a back-up shoe support at the corner, so that pipe-support and bending may commence from said one corner, progressing in the direction of one of the adjacent sides of the frame. The bending forces are provided by a winch mounted on the same platform and utilizing block and tackle that has anchoring reference to one or both of the remaining corners of the frame. In a preferred embodiment, the frame legs which define the platform corner are truncated into halves, whereby the platform and its adjacent leg halves comprise one of two removably securable subassemblies.