A RD-5013 Double-Acting Cylinder was used in the removal and replacement of old pipes on an offshore gas rig. The replacement presented the challenge of how to best remove the pipework, bring it up to the deck of the rig safely & then lower the new pipework into place. The challenge faced in this case arose due to the location of the required maintenance – alongside the rig, where safe access was limited. The solution involved a hydraulic gantry crane (controlled by the Durapac RD-5013 Cylinder) which was mounted to the deck of the gas rig to allow the materials & equipment to be hoisted safely to and from the work area. The RD-5013 Double-Acting Cylinder was chosen for its long stroke and ability to control both lowering & lifting of the gantry boom with precise control.