Untitled record

description

The invention relates to a tube with inner lining, in particular as protection against chemical attack and corrosion at high operating pressures.

Wear and corrosion do not occur only in flue-gas flue liners Cuel OiiciüiöCiien ΡαυΓχΛβΠ αΰΠαοΓΠ oil lyme everywhere where, above all, liquid materials, possibly laden with solids, are transported through pipelines. This also applies to tubular chain conveyors used here.

Are known pipes that have a wear-resistant inner lining. Alternatively, pipes with internal coatings are known to resist chemical attack and corrosion, and still consist of thermoplastic pipes only, but with a very thick wall to withstand operating pressures.

In such pipes, the invention has for its object to provide an inside smooth tube that is very stiff outside and in which even if the inner tube is damaged, the outer tube is not exposed to corrosion attack or the like.

This is achieved according to the invention surprisingly by the fact that in a pipe with inner lining, in particular as a treasure against chemical attack and corrosion at high

operating pressures

for a corrosion-resistant, wear-resistant and wear-resistant design of the composite pipe of a steel jacket tube, further from a so-called inliner made of plastic, in particular a thermoplastic tube, wherein the connection between the thermoplastic tube and steel tube consists of a foamed plastic.

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Preferably, the inner tube and annular gap filling of Pölyurethansehaum flüssigkeitsdieht or gas-tight out forms.

A distribution of the static function of the composite pipe on the steel tundish and foamed-on annular gap and the anti-wear or corrosion protection function on the thermoplastic inner pipe is achieved.

The measures according to the invention provide a whole series of advantages:

The three-layer composite pipe, the task is solved with relatively little material and production costs.

It is achieved that the tube is smooth inside, thus providing the lowest possible frictional resistance. The wear and the drive power, especially in a tube chain conveyor, can be kept low.

Previous pipes provided with internal coating as corrosion protection, whereby the internal coating had to be applied directly to the steel wall, necessitate complicated injection or spin-on processes in an autoclave. If damage to the inner lining occurred, the liquid or chemical components of the material to be conveyed immediately penetrated to the steel pipe at this point. Corrosion or other chemical reactions destroyed the steel pipe.

By the measures according to the invention damage of this kind are largely avoided or restricted.

The inner tube may be a thermoplastic tube, a _. find itohr or the like use.

Any foamable plastic that guarantees the task of connecting the steel pipe with the thermoplastic inner pipe.

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can be used. Preferably, foamed with polyurethane.

Even the thermoplastic tube offers a great resistance to mechanical stresses, as they occur by the requirement of liquid material with a low content of solids. The second protective layer results from the Q polyurethane backfilling. As a result, penetration of the liquid or penetration of the gases to the steel jacket is generally avoided.

Preferably, spacers, in particular made of the .g inner tube welded thermoplastic material such as PE to secure the coaxial position of the inner tube are provided. As a result, the thermoplastic tube is locked at a uniform distance from the steel tube. The properties and the thickness are to be matched to the pressure conditions.

The RingepaIt between the thermoplastic inner tube and

The steel pipe is now filled with polyurethane or another foaming plastic. The filling quantity must be such that the eich forming during foaming or reaction .. Pressure on the one hand not depressing the thermoplastic tube, but on the other hand ensures such strength after the reaction that dae by the trial or operating pressure plastic inner tube not in the Ringfugenfüllung can impress.

In the reaction process (foaming), this can be applied to the

Inner tube are outweighed by that in this lining pipe a back pressure is built up. This may be a flexible hose of different materials under a sufficiently high pressure. The inner tube or the inliner may be composed of different individual lengths; the joints are sealed against penetration of, for example, the polyurethane by the elastic hose under pressure «

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Annular joint and inner tube are designed so that they can withstand both pressure conditions.

Through experiments, a table can be set up. Out

This table can then be read, how large the amount of liquid foam must be in order to meet the above requirements. The thermoplastic inner tube .Q must be selected by the wall thickness and quality of both the plastic and its welding so that it meets the chemical and mechanical stresses during test run and operation.

For the steel pipe, proceed in such a way that this

clothing is squeezed to the desired pressure. According to the pressure, the outer shell thickness and the connecting flanges are now selected. The seal between the flanges can be made so that the thermoplastic see inner lining is pulled over the flange, for example, up to the screw holes of the flanges.

Kahlweise also a thermoplastic ring vorweißt or a weld can be attached. Additional seals between the_{2 B} Pipes can be saved in this way in the rule.

For pipe elbows and other molded parts, the above applies.

For example, the spacers welded to the inner tube may be three in number over the circumference _a0 be distributed, in the axial direction have a distance of about 500 mm, the first spacers are provided near the flange.

Through the use of individually crafted art

_Λcloth tubes - both in diameter and in terms of 35

Wall thickness - a stepless choice of diameter is possible.

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Despite the three-layer structure and its numerous properties, the tube is lightweight and has a thin wall construction. The production costs are low compared to the pipes previously used for such purposes. Relatively wide spans are possible because of steel existing carrier tubes.

The ülingspaltdicke can be varied within considerable limits. This results in that can be used as a carrier tube standard tubes.

In a further development of the invention, if not only the corrosion and the suitability for Gleitförderung but especially the wear-resistant training is in the foreground, according to the invention the composite pipe of a steel jacket pipe, a so-called. Inliner of wear-resistant ceramic material and a connection between the ceramic tube and steel jacket tube from a foaming :; made of plastic.

The ceramic tube can be extremely thin, for example in 3 to 4 mm wall thickness.

Preferably, the ceramic inner tube is made of alumina materials with a high aluminum content or silicon carbide materials. Under the trade name "Kalocer" the Schmelzbasaltwerk Kaienborn (valid manual page 113) mentioned materials are particularly suitable. Instead of the inner tube made of plastic so a tube of ceramic materials is used with a relatively thin wall.

Was in the plastic tube, the tube flanged flanges at its front ends and thus additionally served as a seal, so this is the ceramic tube, of course, not possible.

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It is important on the other hand, that the tubes within the steel tube closely lined up and frontally abgedichtei. be so that during foaming (here again spacers between steel pipe and ceramic tube provided) no foam can penetrate into the interior of the ceramic tube.

For preparation, the pipe ends can be ground smooth, so that they sit flat on each other.

Bandageartige wrapping the inner pipe connections are possible. Winding of the front joints c ^ -ar application of a suitable adhesive or the combination of gluing / wrapping are possible.

An example embodiment of the invention will now be explained in more detail with reference to the accompanying drawings. These show in

a longitudinal section through the composite tube:

is a section along the line AA in Fig. 1;

shows the detail Z of Fig. 1;

4 is a representation similar to FIG. 1 with ceramic

<tgroup cols="2"><tbody><row><entry> FIG. </entry><entry> 1 </entry></row><row><entry> FIG. </entry><entry> 2 </entry></row><row><entry> FIG. </entry><entry> 3 </entry></row><row><entry> FIG. </entry><entry> 4 </entry></row><row><entry> FIG. </entry><entry> 5 </entry></row><row><entry> FIG. </entry><entry> 6 </entry></row></tbody></tgroup>

pipe inliner;

is a section along.5 the plane AA in Fig. 4; FIG. 4 shows the detail Y of FIG. 4 and FIG. 7 shows the detail Z of FIG. 4.

Within a conventional, for example, standardized steel pipe 10 with flanges 18, there is a plastic inner tube, for example of thermoplastic material, in particular

PE. On the inner tube 12 are arranged at a distance

Spacer 20 is welded from the material of the inner tube. For example, three such spacers 20 may be provided distributed over the circumference. The distance to the steel inner tube after insertion is small and is in the Milllmetergröflenordnung. The annular gap, the annular space or the annular joint between the steel outer tube 10 and thermoplastic inner tube 12 is foamed by means of PU foam 14. It is about a two-component PU foam, which cures without comfort oxygen or humidity.

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clearly visible, the inner tube in the region of the flange can be so far high (see at 16 / but not up to the flange holes) that the formation of a seal when connecting the individual pipe parts is formed. 6

4, a steel tube 10 * is provided with welded-on screw flanges 18 ', within which a ceramic tube 120 with the interposition of spacers 20th^! is arranged. The ceramic tube 12Ö is foamed, as well as Fig. 5 clearly shows. In contrast to FIG. 1, the ceramic tube does not run into the joint, but instead; ends flush with the flange joint or the flange.

Fig. 6 shows that shorter tube lengths of ceramic tube 120th

to be used. These can, for example, be smoothed and put together flat on the front ends. Fig. 6 shows a wrapping 124, which was made around two plan aufeinander- -, sitting ends. The wrapping may consist of an adhesive impregnated with tissue. The combination of wrapping and glue makes the connection very dense. It is important above all that the foam 122 does not touch the inside of the ceramic tube during foaming

can get. ;

■ * The detail Z¹ shows Fig. 7. The ceramic tube 120 is ρ

flush with the flange 18 '. The spacer 20⁽ is;

foamed. The foam is down to the face%

(Flange) fed through. The seal also * i |

in the flange area is so very good, especially in the |

FlansGhbereiGh the ends of the respective ceramic tubes full | successive sit.

Ceramic materials suitable for industrial purposes have been described, two examples called representatives. However, the invention is generally directed to tubes made of ceramic materials.

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The individual lengths of the ceramic materials are 500 to 1500 mm.

Other possibilities for connecting the ceramic inner tubes are of course included.

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