Coating processes – Interior of hollow article coating
Patent
1987-04-30
1989-01-03
Lusignan, Michael
Coating processes
Interior of hollow article coating
165133, 1651341, B05D 722, F28F 1318, F28F 1902
Patent
active
047956623
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for coating of tube condensers, coolers, heat exchangers or the like, with an anti-corrosion medium.
BACKGROUND OF THE INVENTION
It is known to provide the tube plates of condensers, coolers, or heat exchangers with a coating of plastic material in order to protect them against corrosion. For this purpose it is necessary to expose the tube plates or the like, if this has not already been done, to enlarge the ends of the tubes imbedded therein, and to close their ends by means of plugs made of synthetic material. Around these plastic plugs, a sealing liquid is applied to the tube plates. The seal is suitable to prevent formation of corrosion craters around the tube ends of either new or already used tube plates. After these operations are completed, the anti-corrosion medium is applied by hand like a primer mass, all the way over the corks in order to insure a complete coating. After the anti-corrosion medium has hardened, it is removed by grinding in the area of the corks, so that these can be removed individually. The application of coatings of anti-corrosion medium to tube plates or the like has proven to be the best known method. Unfortunately, the method is comparatively cumbersome, and thus very expensive, to perform.
SUMMARY OF THE INVENTION
Departing from this state of the art, the invention has the object to create a process for the coating of tube sheets or the like of condensers, coolers, heat exchangers and the like with an anti-corrosion medium, by avoiding the aforementioned disadvantages. A further object of the invention is to provide a process which can be performed in a simple and rapid manner and which insures a satisfactory coating of the tube plates or the like.
These objects are attained according to the present invention through the steps of: a tube plate, the plugs protruding outwardly; plate by firmly applying said shutterring to the outside of the plugs thereby forming an enclosed intermediate space between the tube plate and the shuttering; coating of the tube plate; and tubes.
By this method it is possible to introduce the anti-corrosion medium into the intermediate space for the formation of the coating of the tube plates or the like, through pouring, spraying, etc, which can be accomplished in a relatively short time. Since the shuttering is pressed against the outside of the plugs, the plugs themselves do not become covered by the coating medium, so that after the removal of the shuttering, the plugs can readily be pulled out without a special grinding process.
In order to facilitate plug extraction, the plugs are provided with one or several bores, whereinto a mandrel or the like can be inserted. By carrying out the process according to the invention, a uniform, satisfactory coating can be achieved in a comparatively short time.
The tube ends can be expanded conically or in a curved manner, whereby due to the shaping of the outer contours of the plugs it is insured that the tube ends extending over the tube plate or the like are surrounded on all sides by the corrosion-prevention medium, and that optionally trumpet-shaped inlets result, which prove to be particularly advantageous from the point of view of the flow technique.
As an anti-corrosion medium an epoxy resin is used, which insures a high degree of corrosion protection.
BRIEF DESCRIPTION OF DRAWING
An embodiment example of the invention is closer explained with the aid of the drawing, which shows a sectioned top view of a marginal area of a tube end in a tube sheet, in an enlarged representation.
DETAILED DESCRIPTION
The tube sheet, of for instance a condenser, is marked with 1, therein a multitude of tubes is embedded, but only a wall of one tube 2 is illustrated.
The tubes 2 are fastened to the tube plate 1 at their ends 3 through expansion rolling. The tube plate 1 has fittings 4 at the edges surrounding the bores for receiving the tubes 2.
After expansion of the ends 3 of the tube 2, plugs 5 of synthetic material are inserted therein, which plug
REFERENCES:
patent: 1894957 (1933-01-01), Lucke et al.
Dipl.-ing. Ernst Kreiselmaier GmbH & Co Wasser
Dubno Herbert
Lusignan Michael
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