The present invention provides an adjustable clamp apparatus having curved arms which pivot/articulate relative to each other. The distance between pivot points can be adjusted via specially configured couplers having nuts and threaded rods. The curved arms can be locked together with a rod placed in a slot, and then squeezed by rotation of threaded rod. In the interior of the curved arms there can be a plurality of projections or contact points. A strap can be connected to a selected adjustable clamp (e.g., by a pair of padeyes) and used to raise and lower the clamp. When being lowered onto a pipe to be repaired, the curved arms can be open wide and when their upper portions make contact with the pipe to be repaired, this contact will tend to cause arms to close around the pipe relative to each other. Once clamped against the pipe with the clamps, the repair members can be welded together.