This clamp is built specifically to handle wide variations in pipe diameter, wall thickness and out-of-roundness found in pipes manufactured to API-5L requirements. Because the copper shoe segments tolerate such wide variances, fewer are needed compared to rigid shoe solutions. The shoes can also be resurfaced three times, giving you more efficient and cost-effective operation.

Heavy-duty applications call for the CRC-Evans Heavy Duty Copper Back Up Clamp. Its reinforced structural steel frame deftly handles the large-diameter, heavy-wall pipes typical of offshore projects. The HDCBUC delivers 1.5 times the clamping force of standard clamps, which pushes high-low out to achieve a quality pipe-to-pipe fit. And all functions are wirelessly controlled by the stalking machine operator, which decreases the time for fit-up and eliminates errors such as lowering of the copper shoes during a welding cycle.

This clamp serves as a CBUC as well as a purge clamp.
The corrosion resistant alloys such as 13Cr martensitic stainless steel, duplex and clad materials require a back purge to remove Oxygen from the pipe ID. The purge chamber is integral to the machine. The flow of purge gas is controlled from the open end of the pipe. A built in Oxygen analyzer measures the purity of the gas in the purge chamber in real time. Welding starts when the critical Oxygen content is achieved in the purge chamber.