FI98897B - Cladded tube as well as a method for cladding tubes - Google Patents

Description

98897 Coated pipe and method for coating pipe Överdraget rör samt förfarande för överdragning av rör

The invention relates to a coated pipe or pipe section as set out in the preamble of the appended claims and to a method for coating a pipe or pipe section, respectively. Accordingly, the invention relates to a coated pipe, in particular a thin-walled pipe such as a spiral joint pipe or the like, which consists of an inner pipe known per se and a surrounding coating layer. The invention further relates to a method for coating a pipe, in particular a threaded, modular pipe comprising end flanges or the like, or a similar thin-walled pipe.

Threaded or otherwise thin-walled pipes are commonly used in the construction and similar industries, especially as air conditioning pipes. Air or other gaseous medium is blown through the pipe installed in connection with such pipes. Depending on the application, the medium in question can often be a warm or cold end of the surrounding space, with heat leaking through the bare wall of the thin-walled tube in either direction, which is usually a disadvantage in the form of energy loss. In the case of pipes that are colder than the environment, there is also a risk that moisture will condense on the surface of the pipe, which has many disadvantages. Likewise, a warm pipe ··· · may pose a danger or harm to the environment.

9 9 · 9 • ^ 9 ^: In many cases, the bare sheet metal threaded pipe e ·· is quite ugly, which is a disadvantage especially in spaces such as 9. where people stay. On the other hand, large-scale covering of the air-conditioning pipe with other structures is often inappropriate.

98897 2

There is still a need to mark different pipes installed in the space so that pipes adapted for different purposes or e.g. related to different operating groups are clearly marked differently to facilitate the identification of each pipe in a maintenance situation.

Many different types of coated tubes and different types of tube coatings are already known. Such pipes are usually thick-walled pipes associated with some pressurized technical operation. The use of such pipes in simple and inexpensive locations is generally not economically viable. Likewise, the known coating arrangements have been adapted for considerable thermal insulation capacity, making their use in air conditioning applications unnecessarily complicated. On the other hand, it is desirable for the outer surface of the pipes to be relatively hard, which is generally not the case with known pipe insulators.

Many of the known pipe insulation arrangements comprise pipe • · .1 ”. ground coatings that are pulled over the pipe. Such m · · .. insulators usually consist of a special foam or similar flexible material. Other well-known solutions • • · *. *: sutures comprise trough-like sections placed in succession: and on each side of the pipe.

··· • · · • * · »

Currently used in air-conditioning or similar pipes: often thin-walled pipes with module lengths, with ··· ·: * j *. both ends are fitted ready for connection. *. flange arrangement. It is difficult to coat such a pipe, • · · * li .: because the flange prevents a uniform insulating pipe from being pulled over the actual pipe to be coated. Correspondingly, the insulation consisting of gutters: or blocks must always be fastened in such a way that ··· the various parts remain together around the pipe, which forms an additional work step.

3 98897

In order to remedy the above-mentioned drawbacks, a solution according to the invention has been developed, the features of which appear from the appended claims. Accordingly, the pipe according to the invention is characterized in that the coating consists of an outer pipe made of cardboard or a material substantially resistant to bending, which preferably has a substantially longitudinal shear joint. The method according to the invention is characterized in that the coating is suitably formed of a pre-formed cover tube of insulating material, in particular of rigid paper or cardboard material, which is threaded onto the tube to be coated. Preferably, the threading is facilitated by cutting the cover tube open, especially in the longitudinal direction, whereby the cover tube is applied at the point of threading, after which the cutting groove is preferably closed.

A preferred embodiment of the invention will now be described in more detail with reference to the accompanying drawing, in which ... the sole figure shows a part of a coated flanged modular tube and an open cut casing tube to be threaded over the flange ** according to an embodiment of the invention.

• · • e * · *: In the described case, the body of the basic pipe 1 is formed e.g.

• ·: of a thin-walled pipe 3 with a threaded seam 2. For the installation of a duct: the pipe is formed with a so-called

a modular pipe, having an annular flange 4 at each end: or a corresponding connecting member projecting from the surface of the pipe body 3 (for clarity only the other end of the pipe is shown in the figure).

• · · • ♦ · ··· · · «·

According to the invention, the coating j of the body 3 of the tube 1 is formed by cutting open a cover tube 5 formed by a suitable, preferably relatively rigid and thus anti-deformation material by conventional methods. It has been found that a conventional cardboard tube known per se provides a particularly advantageous coating solution. such tubes are commercially available in a wide variety of sizes and thicknesses. Although cardboard is not always the most effective insulator possible, its insulating properties are well suited for most applications. In addition, the cardboard tube has a rather strong technical structure, so that in practice the coating tube often provides a very effective additional mechanical protection for the very light-structured inner tube body 3.

Especially in the manufacture of flanged modular pipes, the fastening of the end edge flanges 4 or the like is based on welding. In this case, the insulating layer arranged before attaching the flanges or the like would both be detrimental to the welding and would itself be susceptible to damage. For this reason, insulation in connection with such pipes must only be installed after the end flanges have been welded. Again, this fact has so far precluded the use of strong tubular insulation in such cases, so that a rather complex insulation structure has had to be resorted to, even in cases where simpler • · .Γ * insulation would be technically and economically sufficient.

• · • e · m • e • * ^ · * Especially in the case of modular pipes, the insulation arrangement according to the invention thus offers a considerable improvement. According to the invention, the insulation work is carried out in such a way that the existing insulation pipe .5 made of cardboard or the like is cut open, e.g. by sawing or other processing method giving a narrow cut: so that the «M · 5 a substantially longitudinal section e is formed. 6, which extends through the entire structure 7, 8 of the insulating tube 5.

e e e · ”5 In the figure, the section mark 6 is shown wider than actual for the sake of clarity.

m m • e · • e · ···

After the cut, the cross-section of the insulating tube 5 is thus arcuate, so that the tube is easy to spread so much that the insulating tube 5 can be threaded over the end edge flange 4 of the module tube 1 or a corresponding protruding connecting member. The figure shows the insulating tube shorter than the basic tube body 3 for the sake of clarity, but in practice the length of the insulating tube 5 corresponds exactly to the distance between the end edge flanges 4 of the basic tube.

The cardboard tube or the like itself is generally so rigid in structure that the insulating tube 5, even when cut, remains well against the surface of the body 3 of the inner tube 1 without any other measures. If necessary, however, the cutting groove 6 can still be closed, e.g. by taping or using heat sealing. At the most demanding points, an adhesive 9 can still be used between the inner tube body 3 and the inner surface of the insulating tube 3, whereby the module tube structure becomes completely uniform. In this case, the insulating and / or insulating pipe is suitably treated before the coating pipe is threaded with an adhesive 9, which may be treated, in particular cured after coating.

• ·· • »e ·. **; The use of a cardboard tube as an insulation and / or a coating for thin-walled tubes is also advantageous because the surface of the cardboard tube body 7 »· ^ · * is particularly easy to be provided with a suitable coating 8. In this case, for example, a conventional # m \. \\ aluminum foil coating, which gives a clean, easy to clean! a surface that also acts as a heat-reflecting layer. The outer surface of the cardboard insulation tube body 7 is: also can be coated with other film-like material • ee · .'Γ. such as with a colored coating. Preferably Such. the coating 8 is applied even before the coating operation, the insulating • e ·: ·· · pipe 5 is still intact. The bare cardboard tube can also be easily painted either before or after coating.

e e e e ♦ e · e · *

The thickness of the insulating pipe 5 is selected according to the requirements of the application. In this case, in some cases a pipe 5 so thin is sufficient that only the desired surface structure can be formed.

6 98897

In other cases, the thickness of the insulating tube 5 is selected according to the desired heat-absorbing properties, or e.g. according to the required structural strength.

As such, the cardboard tube is, for example, quite poorly flammable, but the insulating cover tube 5 can still be treated separately before installation in order to improve the desired fire resistance, sound attenuation or the like. Particularly with regard to sound attenuation, the properties can still be influenced by selecting the material quality, the structure and / or the possible adhesive 9 between the insulation and the pipe to be coated, the vibration damping according to the characteristics.

Some preferred embodiments of the invention have been described above, but it is clear that the invention can be applied in many other ways within the scope of the appended claims. For example, it is clear that the coating arrangement according to the invention is also suitable for use with pipe sections. to coat.

• 9 999 99 9 • 9 • · «• • 9 9 9 9 9 9 · 9 9 9 • ·· 9 9 9 9 19 9 9 9 9 9 9 9 9 * * 9% 9 9 9% 9 9 9 9 9 9 9 999 9 999 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 4 4 • • · ··· • 99 9 9 4 999 9 • 9

Claims (10)

A coated tube or tube member, in particular a thin-walled tube such as a spiral tube (1) or the like, which consists of an inner tube body (3) known per se and a coating layer (5) surrounding the body, which layer (5) as a a substantially uniform piece has been arranged around the inner tube body (3), characterized in that the coating layer (5) consists of an outer tube material (7) formed of cardboard or similar material which substantially resists bending and which before being placed in place has the shape of a whole tube. Pipe according to claim 1, characterized in that the pipe material (7, 8) of the coating (5) is specially treated to facilitate the coating, in particular having a substantially longitudinally cut joint, and / or to improve desired properties such as the fire resistance. . Pipe according to claim 1 or 2, characterized in that the cover (5) is a casing known per se • cardboard tube (7), wherein the coating (8) is suitably colored and advantageously is a aluminum foil. · «· • · ♦ • ·» · 4. Pipe according to any of claims 1 ... 3, characterized by c - • · ϊ. notwithstanding that, between the cover (5) and the tube (3) which is to be coated with a glue layer (9). • »«. 5. A method of coating tubes, in particular a helical * * Γ with end flanges or the like (4) provided with modular tubing or a corresponding thin-walled tubular body (3) or parts thereof, whereby a coating tube (7) is threaded on top the tube body (3) to be ·····, characterized in that the cover (5) *. is formed of insulating material, in particular of a sectional [or cardboard material formed by cutting] of an insulating, per se fully coating tube (7), preferably a paper tube per se known. 98897 6. A method according to claim 5, characterized in that, in particular, the cutting is carried out substantially in the longitudinal direction of the tube, before the cutting rescue is performed at the cutting (6), the cut-off cover tube (7) is extended and the cut-off lock (6) is closed. after the rescue. Method according to claim 6, characterized in that, prior to cutting, the insulating coating tube (7) is provided with a surface covering (8) corresponding to the purpose of use of the tube. 8. A method according to claim 7, characterized in that an aluminum foil, a colored surface layer and / or something similar is used as a surface covering (8). 9. A method according to any one of claims 5 to 8, characterized in that the insulating coating tube (7) and / or cladding (8) prior to mounting are specially treated to improve the desired properties of the insulation such as the fire resistance, sound damping properties or the like. . The method according to any one of claims 5 ... 9, characterized in that the insulating tube body (7) and / or the treatment of the insulating pipe body (7) are treated before and after the threading (7, 8). ·: Pipe body (3) to be insulated with an adhesive (9) that can be treated, especially cured after coating. • 1 · • · ♦ • · · ··· ··· · · · · · · · · · · · · *