Abstract: Apparatus and method for clamping a flanged joint, comprising a clamp having first and second clamp devices applied to circumferentially separate portions of the flanges, each device having a foot to engage an outer face of a flange, and a force driver adapted to press the flanges together from opposite sides of the flanged connection. The clamping devices are circumferentially spaced apart on the flange, and a foot portion is adapted to engage the outer face of each flange circumferentially between the bolts, to allow transmission of forces to the flanges without applying forces to the bolts, or the nuts or other fixings attached thereto. The clamping force is applied not through the existing bolts passing through the flanges, but through the clamping device of the invention.