The CIRRIS XI™ and CIRRIS XR™ robots will give gas network operators an alternative to direct burial replacement by reducing pipeline risk and extending the usable life of large diameter (12″-48″) cast iron gas distribution mains. The CIRRIS XI™ provides a means to assess the structural integrity of the pipe through measurements of wall thickness and stress to improve the way gas distribution utilities measure risk and ensure their assets are a good candidate for rehabilitation.