The tubular tape comes in 18mm and 26mm widths with 1000kg and 1650kg breaking loads respectively so either of these would be fine for that application. This stuff gets used for loads of different things other than climbing tat: because its hollow we also get quite a lot of scuba divers using it to protect their air pipes against chafing. I've also used it to cover chain to prevent rattling and make it nicer to handle but is also used in patient hoists in hospitals, repairing sofa webbing etc.
Dean.
Dean.