(1) I towline of the support plate, the aluminum support plate block towline, the support plate according to user requirements to play the rectangular hole or round hole. The towline strength, to apply to Xu carrying a heavier load; (2) aluminum support plate II towline that support plate down separately style threading towline apply to the pipeline joints diameter greater than line The maximum diameter of the body, and needs the often detachably occasions; type III (3) of the supporting plate steel towline, i.e. frame steel stringing towline within the separator sheet of plastic or aluminum system. For more tube cable specifications varieties occasions. 2 steel threading the towline Model Select the requirements. According to the maximum diameter of the worn tube cable to determine the the towline height. The towline height = umbilical maximum diameter × 1.1 times. Rounded determine the towline the height which identified The towline models for TLxx or TLGxx. 3 threading Towline bending radius calculation method: the installation of the towline height minus a towline height divided by two for that purpose towline bending radius. 4 the towline length calculation method: towline trip plus bending radius × 3.14.