Device for coating the internal surface of a pipeline with a cem

Details Device for coating the internal surface of a pipeline with a cem Device for coating the internal surface of a pipeline with a cem

1986-06-09

1988-05-24

McIntosh, John P.

Coating apparatus

Solid member or material acting on coating after application

Inside of hollow work

118306, 118DIG10, B05C 702, B05C 1104

Patent

active

047458798

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to the maintenance of cross-country pipelines, and more particularly to a device for coating the internal surface of a pipeline with a cement-sand mixture.
2. Description of the Prior Art
Repair work at pipeline transport is becoming increasingly important in the world today. During repair or the construction of new pipelines a protective coating of a cement-sand mixture is applied on the internal surface thereof. This coating is very durable.
Most diversified equipment is used to form a coating from the cement-sand mixture (cf. e.g., Instructions on the Maintenance of the Equipment for Applying a Cement-Sand Mixture of the AMERON company, New-York Publishers, 1978, pp. 548-601).
To apply the cement-sand mixture on the inside of a pipeline use is made of a device, comprising a mechanism for applying the mixture on the pipeline surface, a system for feeding the mixture to the said mechanism, a compressor for imparting rotation to the working member of the application mechanism and a pull winch.
The cement-sand mixture application mechanism is connected by a wire rope with the pull winch, and by hoses--with the compressor and the mixture feed system. The mixture feed system and the compressor are fitted with electric motors and drums.
As the wire rope and hoses leave the pipeline, the hoses are disconnected from the rope and manually placed near the pipeline.
Once the coating has been applied, the application mechanism with the hoses and the rope are removed from the pipeline, the mixture feed hoses are disconnected from the rope and washed with water. Thereafter, the rope and the hoses are wound on respective drums.
This sequence of operations prolongs the entire technological cycle of applying the coating on the internal surface of the pipeline and increases the expenditure of manual labour and requires numerous service personnel. Besides, in case of sudden stoppages of the device, the cement-sand mixture is likely to solidify in the hoses.


SUMMARY OF THE INVENTION

The present invention is aimed at solving the problem of developing the device for coating the internal surface of the pipeline with the cement-sand mixture, wherein the mixture feed hoses and the pull hose are wound in such a way as to preclude the sequence of winding and placing them, as well as to reduce the amount of equipment used for coating, decrease labour costs and the service personnel.
The aforementioned problem is solved by the invention by the use of the device for coating the internal surface of the pipeline with the cement-sand mixture, comprising a mixture-application mechanism, systems for feeding the mixture and the working medium connected by hoses with the coating application mechanism, a pull rope secured in the winch drum, wherein, according to the invention, the hoses for feeding the mixture and the working medium together with the rope are wound on the winch drum and are passed by their ends through the drum shaft which is made hollow and at the ends has immovably mounted assembles communicating the mixture and the working medium feed systems with the respective hoses.
The winding of the rope and the hoses onto one drum makes it possible to reduce the amount of equipment and increases the device capacity, as well as completely eliminates manual labour necessary for connecting and disconnecting the hoses from the rope and placing the hoses near the pipeline, since it is particularly difficult to place the hoses filled with the cement-sand mixture.
Making the shaft hollow and the availability of supporting assemblies at its ends which communicate with a respective mixture feed system enables the device, as the drum rotates, to feed the mixture and the working medium (compressed air) through the hoses. Therefore, the hoses and the rope and wound on one drum of the winch simultaneously.
It is expedient that hermetic chambers be made at the shaft ends which communicate with the ends of the hoses and accommodate supporting assemblies, each o

REFERENCES:
patent: 3067721 (1962-12-01), Collins, Jr.
patent: 4216738 (1980-08-01), Muta
Klimovsky, Purging and Testing of Trunk Pipelines, NEDRA, Moscow 1966 (pp. 188-189) (with English translation).

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