Coating internal surfaces of curved conduits

Coating processes – Interior of hollow article coating

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Details

427236, 427239, 118704, 118705, 118706, 118215, 118242, 118254, 118317, 118323, 118408, 118DIG10, 219 61, 219 7614, B05D 722, B05C 700

Patent

active

045144435

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

The present invention relates to apparatus for coating internal surfaces of curved conduits.


FIELD OF THE INVENTION

Flow of fluid through a pipe or conduit such as flow of gas or liquid through a pipeline, encounters wall friction. To minimize this there is a tendency to use as large a bore as possible and changes in direction are avoided as much as possible. However, some bends in a conduit system are unavoidable.
In passing through bends not only is the direction of flow changed but complex whirl patterns can be set up which increases friction exerted on the internal walls of the conduits.
Further, liquids are frequently used for transporting suspended particles and/or to take away unwanted materials that are drawn through the carrier liquid. The liquid borne materials may themselves be extremely abrasive and cause much damage in contact with internal walls. Thus, curved or bent sections of pipes or conduits may be under considerable stress and are subject to significantly more wear than straight sections.
It follows that curved or bent sections need to be provided with a protective inner coating such as a hard protective coating. Hard protective coating is known for other purposes and is called hard facing. Hard facing may be applied by various techniques such as welding, spraying or by plasma.


SUMMARY OF THE INVENTION

In accordance with the present invention there is provided an apparatus for coating an internal wall of a curved conduit with a layer of protective material, characterised in that it comprises a guide means, a longitudinally flexible member which is transversely substantially rigid associated with the guide means, means for mounting a coating means adjacent a first end of the flexible member for incremental rotation with the flexible member, a drive means for driving the flexible member relative to a curved conduit to be coated, so that the coating means can enter the curved conduit in use and so that the coating means can deposit a strip of protective material longitudinally of the conduit, and means acting on the flexible member for automatically stepping the flexible member and consequently the coating means by a rotational increment after the coating means has completed a traverse of the conduit and for automatically reversing the drive means so that the apparatus deposits a strip of protective material adjacent the first laid protective strip.
In accordance with the present invention there is provided a method of coating an interal wall of a curved conduit which comprises inserting a curved guide means in the conduit which guide means extends substantially axially of the conduit, said guide means having a longitudinally flexible member in association with it so as to cause the flexible member to be longitudinally guided by the guide means, connecting a coating member adjacent one end of said flexible member, providing drive means for moving said flexible member and thus said coating means relative to and longitudinally of said conduit, causing the coating means to deposit a layer of protective material in a strip extending longitudinally of said conduit, and then rotationally incrementally stepping the flexible member, and the coating means to an adjacent position and reversing the drive means so as to cause the coating means to deposit a further strip of protective material adjacent the first coated strip.
The present invention is particularly concerned with applying substances which protect curved conduits against abrasion or corrosion alloy facing on curved conduits but it is to be understood that it is general applicability in that this coating can take other forms. For example, the coating could be an organic protective material.
By coating longitudinal strips of protective material in side by side relationship around the curve of the conduit, the coating strips run in the same general direction as the fluid running through the conduit in use. Thus, not only is the conduit protected by a protective coating but the coating promotes a smooth lamina flow.


BRIEF

REFERENCES:
patent: 2002701 (1935-05-01), McWane
patent: 2295702 (1942-09-01), Wissler
patent: 2461517 (1949-02-01), Carnevale
patent: 2818083 (1957-12-01), Jelm
patent: 3180312 (1965-04-01), Handley et al.
patent: 3606862 (1971-09-01), Huff et al.
patent: 3818862 (1974-06-01), O'Brien et al.
patent: 4165245 (1979-08-01), Ludwig
patent: 4253006 (1981-02-01), Ludwig
patent: 4343436 (1982-08-01), Lehmann

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