| 摘要 |
<p>An external pipe covering apparatus is provided for coating exterior surfaces of uncoated longitudinal (50), helical (70) and girth (60) weld joints of a pipe (80) to provide protection against corrosion, to minimize the weld projection by filling in any voids on either side of a weld, and to further provide a uniform smooth surface for a later applied tape. The apparatus is moved along a pipeby a crane or similar mechanical device. The apparatus has a carriage (12) to which is attached wheels, a reservoir (20) attached to the upper frame of the carriage for holding liquid resin, a circular member (30) having at least one sensor (32) therein attached to the lower frame of the carriage, a microprocessor (34) attached to the upper frame of the carriage, a circular dispenser (36) for dispensing liquid resin having at least one nozzle (40) and at least one solenoid valve attached to the lower frame of the carriage for dispensing resin from the reservoir, and a pump (42) for delivery of liquid resin to the nozzle. In operation, a sensor or sensors send electrical signals to a microprocessor, which then sends and electrical signal or signals, depending on the type of weld joint sensed, simultaneously to a corresponding solenoid valve or valves and a positive displacement pump. The pump when activated pump liquids resin to a nozzle(s) through the activated and open solenoid valve(s). The resin is then sprayed by the nozzle onto the weld joint area. <MATH></p> |
