The known devices designed for the application of polymeric coatings on pipes inner wall, in particular, on cooling liquid-bearing pipes in condensers or exchangers, comprise a feeder intended for the intake and delivery of a coating material, a coating unit for distribution of the material incoming from the feeder inside, and control unit designed to control the coating material supply and the process of internal wall coating.

In the newly developed device, a coating unit has a guide sleeve with a tip putting on a coating pipe, and a controlled movable hose with a spraying nozzle, installed in the guide sleeve; the hose is inserted in the pipe through a cover plate of the guide sleeve. The control unit is capable to regulate a flow of a coating material during the suction and spraying as well as a working pressure in the device. The control unit is also preprogrammed for preset inlet length and speed as well as for working hose outlet speed.

Several modifications of the device are described.

In the first modification of the device, a working hose can be purposefully introduced inside a coated pipe over all its length and deducted back through a guide sleeve.

In the second modification of the device, a working hose is a high pressure hose with a nozzle for airless spraying, which is intended for coating when the working hose is being withdrawn from the pipe.

In the third modification of the device, a guide sleeve ends in a hand-spraying gun on which a tip is installed. The said spraying gun is connected with the guide sleeve through a flat hinge, while a working hose passes through the spraying gun and the tip.

In the fourth modification of the device, the design of a tip provides the centering of a working hose in the pipe; to attach to the coated pipe, the tip is nearly oval-shaped.

In the fifth modification of the device, a working hose in the spraying nozzle area is provided with a filter and a return valve.

In the sixth modification of the device, unlike pos. 3 and 4, a spraying gun is provided with hand controls.

In the seventh modification of the device, material inlet pressure is set; the pressure is 5-500 bars (0.5-50 MPa), preferably 10-250 bars (1-25 MPa).

In the eighth modification, the device is provided with a feeder which includes a sucking hose with a primary filter connected with a feed pump which operates dependent on the outlet pressure.

In the ninth modification, the device is equipped with a return valve and a double-filter set which are installed in the area of material inlet in the coating unit.

In the tenth modification, the device is provided with an engine-drive drum for reeling a working hose.

In the eleventh modification of the device, the control unit is programmed for preset values of spray speeds and material consumption.

In the twelfth and thirteenth modification of the device, the device is mobile (12th); here, the control unit is placed on one movable carriage, while coating unit - one the other. Both carriages are connected with one another through a material hose (14th).

Kreiselmyer Richard

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