Internal girth weld liquid coating cart

摘要

The invention relates to a machine for coating the interior of a pipe. The machine can be pulled through and positioned within a pipe or pipeline by a internal pipe tractor, and can be used to apply viscous liquids, including two part epoxies and urethanes, to the interior wall of the pipe. The machine is typically used for the overcoating of portions of pipe having defects in their internal coatings, for example, at their girth welds.

主权项

1. A liquid coating cart for coating an inside surface of a pipe, comprising:
(a) a frame, having a rear end and a front end, and wheels capable of displacing the frame along the inside surface of the pipe; (b) a controller, capable of receiving instructions from a remote interface; (c) a cartridge containment block, capable of housing at least two fluid cartridges, each of said fluid cartridges containing fluid for coating the inside surface of the pipe; (d) a housing for a static mixer, located in or proximal to the cartridge containment block, and situated such that when fitted with a static mixer having a feeding end and a nozzle end, a channel is formed between the fluid cartridges and the feeding end of the static mixer, through which the fluid can be displaced; (e) a ram system capable of displacing said fluid out of said fluid cartridges and into said static mixer when said fluid cartridges and static mixer are fitted to said cartridge containment block and housing, respectively, and then through said static mixer and out of said nozzle end, said ram system controlled through the controller; and (f) a fluid dispensing unit, comprising a cup having an interior bottom and an interior sidewall, said cup connected to a cup drive motor capable of rotating said cup around an axle connected to its interior bottom, said cup drive motor controlled through the controller;
said fluid dispensing unit capable of displacement between two positions, an operating position wherein the cup is proximal to the nozzle end of the static mixer such that fluid displaced from the static mixer enters the cup, and a transport position wherein the cup is further from the nozzle end of the static mixer such that fluid displaced from the static mixer does not enter the cup; said displacement controlled through the controller;wherein the controller controls the ram system and the cup drive motor.