FR2719358A1 - Advanced system for fixing thermal insulation on similar pipes and pipes. - Google Patents

Abstract

The present invention relates to an improved system for attaching thermal insulators to piping and other similar conduits comprising the following steps: (a) wrapping the conduit (20) with an insulating material (18); (b) enveloping the entire pipe (20) and insulating material (18) by the longitudinal tubular clamp (10) having an open tubular member (12) with a normal end (14) and a larger diameter end (16) , having on the open side surface and at the ends of said open tubular member (12) transversely and longitudinally oriented devices (22, 24) for the operation of opening and closing said longitudinal tubular clamp (10); and (c) superimposing after closing said longitudinal tubular clamp (10) self-adhesive strips in the transverse and longitudinal directions (26, 28) respectively on the transversely and longitudinally oriented devices (22, 24) to close and open said tubular clamp longitudinal (10).

Description

IMPROVED INSULATION FIXING SYSTEM

  THERMAL ON PIPES AND SIMILAR CONDUITS

  The present invention relates to an improved system for fixing thermal insulators on similar pipes and conduits, for fixing different types of flexible and semi-flexible thermal insulators on the pipes, also ensuring their protection against the effects of weathering and their resistance against mechanical deterioration, with a better yield, a better productivity and, consequently, a total cost substantially lower than that of the covering devices currently used, said system being used for the thermal insulation of the pipes to high and low temperature used by industries

in general.

  Currently, the thermal insulation system adopts metal strips and a bent strip of plastic material, aluminum or steel with gaskets, which fix the aluminum protection plate, or as fastening to the pipe to be insulated. already painted steel. The above fastening systems must be installed by specialized personnel using special tools, which entails considerable costs.

  of all the thermal insulation.

  In addition, the current thermal insulation system employs semi-rigid and flexible insulators, for example calcium silicate, rock wool, expanded polyurethane, fiberglass and other similar materials which are protected by a protective foil. aluminum, an already painted plate, metal or non-rolled metal strips, joints and other

analogous devices.

  It is therefore desirable to provide an improved system for fixing thermal insulation on similar pipes and conduits in order to eliminate the use of metal strips, bent strips of plastic, aluminum or steel with joints, and the like, as well as a system that eliminates the use of rigid, semi-rigid and flexible insulation by using other elements

protection.

  The above objectives as well as other objectives are achieved by proposing an improved system for fastening thermal insulators on pipes and similar conduits including a longitudinal tubular clamp which allows excellent fixing of the insulation to the surface of the pipe, and which also provides impermeability and impact resistance, said longitudinal tubular gripper being made of PVC (polyvinyl chloride), PRFV (glass fiber reinforced polyethylene), polyester, polypropylene, polyethylene or any other polymer

and metal element.

  In addition, the thermal insulation system includes the application on high and low temperature pipes used by industries in general, insulating material based on ceramic fibers (silica and alumina or calcium silicate and magnesium) , then the application of external protection constituted by

longitudinal tubular forceps.

  In addition, the thermal insulation system for fixing thermal insulators on similar pipes and conduits comprises in the open lateral surface and at the ends of the longitudinal tubular clamp the installation of fastening devices in the form of transverse zippers and

  longitudinal and self-adhesive tapes.

  The objects, features and benefits of

  invention, will appear better from the description

  The following detailed description is taken in conjunction with the accompanying drawings, in which: FIGS. 1A and 1B show perspective views of the longitudinal tubular gripper with respectively a detail of the profile and a detail of the fastener; Figures 2A, 2B, 2C, 2D and 2E show perspective views of a detailed profile and attachment of a "T" to 90 as well as details of the profiles of a 90-elbow, elbow at 45 and diameter reducers employing, respectively, segments of the tubular clamp; Figure 3 is a perspective view illustrating a coating system for industrial driving; Figure 4 is a perspective view illustrating a cover system for an industrial conduit provided with a valve; Figure 5 is a perspective view of the longitudinal tubular gripper containing the ceramic fiber insulating material and a fastening system by transverse and longitudinal zippers; Figure 6 is a perspective view of the longitudinal tubular clamp surrounding an industrial conduit of an insulating material of ceramic fibers and the fastening system by transverse and longitudinal zippers; Figure 7 is a perspective view of the longitudinal tubular clamp surrounding an industrial conduit of the ceramic fiber insulating material, and the fastening system by zippers.

  cross-sectional and longitudinal

  adhesive; Figure 8 is a perspective view of the longitudinal tubular clamp surrounding an industrial conduit of the ceramic fiber insulating material and the self-adhesive tape covering the transverse and longitudinal zippers; Figure 9 is a perspective view of a segment of the tubular clamp showing a bend 90 surrounding an industrial conduit of the ceramic fiber insulating material and the fastening system by transverse and longitudinal zippers; Figure 10 is a perspective view of a segment of the tubular clamp showing a bend 90 surrounding an industrial conduit of the ceramic fiber insulating material and the fastening system by transverse and longitudinal zippers; Figure 11 is a view illustrating the improved system for attaching thermal insulators to a buried pipe; Figure 12 is an enlarged view of a dilatation bend with an annular support showing a portion of Figure 11; Figure 13 is a view showing the isolated industrial pipe laid in a trench for installation of buried pipes; Figure 14 is a top view of the longitudinal tubular clamp surrounding an industrial pipe placed on the roller or fixed support; and Figure 15 is a cross-section of the clamp

  longitudinal tubular shown in Figure 14.

  According to the invention, an improved system is proposed for fixing thermal insulators on pipes and similar conduits comprising a longitudinal tubular clamp 10, which constitutes an excellent fixing of the insulator to the surface of the pipe, while still ensuring impermeability and impact resistance; said longitudinal tubular clamp 10 comprising an open tubular member 12 having a normal end 14 and a second end of larger diameter 16, made of PVC (polyvinyl chloride), PRFV (glass fiber reinforced polyethylene) , polyester, polypropylene, polyethylene or any

  other polymer and metallic elements.

  The longitudinal tubular gripper 10 is characterized by: a density of 1.20 to 2.00 kg / m3, a weight of 2.26 kg / linear meter, a low coefficient of thermal expansion, good properties of flexibility, resistance mechanical degradation, resistance to corrosion, chemical resistance, since it is insensitive to acids and mineral bases and resistant to substances present in industrial effluents, the clamp is easy to clean, excellent impermeability, uniform finish, easy transportation, handling, cutting and assembly requiring no specialized labor

No special equipment or tools.

  The installation of the longitudinal tubular clamp does not require any special device, such as strips or wires, thanks to its tubular shape and its plasticity, the multiple segments of the clamp being coupled one after the other by the ends. 14 and the ends of larger diameter 16, the longitudinal sections being out of phase so as not to allow easy opening, bends with a small radius of curvature and "T" shown in Figures 2A-2D, being protected, only by modifying the formed cut

in the clip.

  Furthermore, the improved system for fixing thermal insulation on high and low temperature pipes, used by industries in general, includes the application on the pipes of an insulating material 18 based on ceramic fibers, preferably silica and alumina, or calcium silicate and magnesium, and then the installation of an outer protection constituted by the tubular clamp

  longitudinal 10 described above.

  The thermal insulating material 18 of the system of the invention is made of ceramic fibers by electrofusion of silica and alumina, and also calcium silicate and magnesium, which have as characteristics: a thermal conductivity at 313 C of 0.056 kcal .m / m2h. C, a temperature limit of use of the order of 950 C, a melting point of 1760 C, resistance to thermal shock, a completely inorganic material, no deterioration under the effect of water or oil, a density of 64, 96, 128 and 240 kg / m3, no risk of health nuisance, great flexibility, which allows to use it for pieces of configurations or complex shapes. The improved system of the invention is applicable whatever the weather conditions, for example in rainy weather and / or high winds or in the presence of atmospheric condensation, the use to be avoided only when the product is soaked in or immersed in oil or water, only because of its higher weight and difficulties of use. The temperature at the surface of the piping is not important either, just take precautions during installation to avoid personal injury, such as burns due to the temperature of the pipe to isolate. The application of the system does not require any specialized labor or special tools, it does not require any period of

its application is immediate.

  In case of use in unprotected places, for example in the open air, the system of the invention comprises a longitudinal tubular clamp 10, which allows an excellent fixation of the insulator 18 to the surface of the pipe, ensuring still the impermeability and the resistance to shocks, by avoiding that the fibers are impregnated with water

  rain and risk of mechanical damage.

  The insulating plates 18 may be applied either helically or in several sections, having a width identical to the perimeter of the pipe to be insulated and using temporary fasteners by adhesive strips. The longitudinal tubular clamp 10 must be immediately placed on the insulating plate 18, so as to ensure its protection against the action of the weather (rain) and its attachment to the pipe 20. The multiple segments of a protective coating formed by the clamps 10 must be assembled by the normal ends 14 and the ends of larger diameter 16, the longitudinal sections being out of phase, so as not to be easily opened. The piping accessories are insulated, wrapped with ceramic fiber insulation strips, which are protected by a prefabricated protective coating (pliers), depending on the geometry of the connection (curves, T, reductions and connections as shown 2A to 2E), the fixing of the opening being not

  necessary for inspection matters.

  The flanges 46 and the valves 48 shown in greater detail in FIGS. 3 and 4 must receive a segment of the protective coating 50 having a larger diameter, with at each end diameter reducers 52 (FIG. 4) mounted so as to maintain the thickness of the insulator 18 and to keep their functional properties. In parts that require greater impact resistance, the protective coating must be thicker, all the others

  characteristics of the system, however, are maintained.

  In order to insulate buried piping or bushings, the procedure is the same as above, but the following remarks must however be observed: if the pipes are placed inside a sheath, flakes of the material insulating the system must be introduced. in the annular space between the steam duct and the inner surface of the sheath serving as an envelope, the longitudinal tubular clamp being no longer necessary; if the pipes are not laid inside ducts, the specification already defined for air laying must be adopted, but, all the joints along the circumference and in the direction of the length, must be welded or fixed in such a way as to ensure the impermeability of the system in this

part.

  The thermal insulation system for high and low temperature pipes (approximately from -200.degree. C. to 1260.degree. C.) consists of wrapping the industrial pipe 20 to isolate insulating material 18, for example ceramic fibers. The insulating material 18 is placed on the surface of the pipe 20 by being spirally wound or laid by plates of several lengths having a width identical to the perimeter of the pipe to be insulated. Then, the longitudinal tubular clamp 10 is placed on the surface of the insulating material 18 to surround the pipe

and the insulating material 18.

  The longitudinal tubular gripper 10 is equipped in the transverse longitudinal sections of transverse and longitudinal zippers 22, 24 for the closing operation of said longitudinal tubular gripper 20. On the transverse and longitudinal zippers 22 and 24 of the self-adhesive strips 26, 28 transverse and longitudinal are applied transversely and longitudinally, constituting the assembly operation of the thermal insulation system as shown in more detail in Figures 5 to 8. Figures 9 and 10 represent segments longitudinal tubular gripper 10 used respectively in a bend at 90 32 and a bend at 45 34. It should be noted that the intersection of the transverse and longitudinal portions of the bend at 90 32 and the bend at 45 34 constitutes an inclined weld 36 obtained by thermofusion or gluing, the glue used being

  Preferably, the adhesive is ethyl cyanoacrylate.

  In addition, a greater advantage of the improved system of the invention relates to its use on buried pipes, in fact the traditional thermally insulated pipes are not buried because of the movements created by the expansion.

thermal pipe.

  The system using longitudinal welded tubular clamps can be applied and installed on buried conduits, thanks to the clamps without harming

  insulation or cause any movement of the ground.

  Figure 11 shows the improved thermal insulation fastening system applied to buried conduits, it indicates the annular support 38, the ground level 40, the tubular clamp segments 90 in the elbow, the longitudinal tubular clamp 10, the

  insulating material 18 and industrial lines 20.

  Figure 12 shows on a larger scale a dilatation elbow with an annular support which

  is a part of Figure 11.

  In addition, as shown in Figure 13, the industrial pipe 20 wrapped with insulating material 18 and the longitudinal tubular clamp 10 is placed in trenches 42 for the installation of buried pipes and then covered with earth (materialized by points

44 in Figure 13).

  FIGS. 14 and 15 also represent, by way of example, the thermal insulation system placed on the

roller or fixed support 54.

he

Claims (8)

  An improved system for fixing thermal insulators on similar pipes and conduits, characterized in that it comprises the following operations: (a) wrapping the pipe (20) with an insulating material (18); (b) wrapping the entire conduit (20) and insulating material (18) with a longitudinal tubular clamp (10) comprising an open tubular member (12) having a normal end (14) and an end larger diameter (16) and provided on the open side surface and at the ends of said open tubular member (12) means (22, 24) oriented transversely and longitudinally used in the opening and closing operation of said longitudinal tubular clamp (10); and (c) superimposing after closing said clamp   longitudinal tubular (10) of the self-adhesive strips   transverse and longitudinal adhesives (26, 28) respectively on the devices (22, 24) oriented transversely and longitudinally to close and   opening said longitudinal tubular clamp (10).   2. An improved system according to claim 1, characterized in that said insulating material (18) applied on said pipe (20) is applied in helical coils or in the form of plates of several lengths having widths substantially identical to   perimeter of the pipe (20) to be isolated.   3. An improved system according to claim 2, characterized in that said insulating material (18) is made of ceramic fibers by electrofusion of silica and alumina or calcium silicate and magnesium. 4. An improved system according to claim 1, characterized in that the multiple segments of longitudinal tubular clamps (10) are successively assembled by their normal ends (14) and their ends of larger diameter (16), the   longitudinal sections being out of phase.   5. An improved system according to claim 1, characterized in that said devices oriented transversely and longitudinally (22, 24) for closing and opening said tubular clamp   longitudinal (10) are sliding devices.   6. An improved system according to claim 1, characterized in that said longitudinal tubular clamp (10) is in accordance with the geometry of the connector (curves, T, reductions and connections, elbow 90 and elbow at 45).   7. An improved system according to claim 6, characterized in that the segments (32, 34) of the tubular clamp comprising closure devices (33) in the elbow 90 and the elbow 45 respectively comprise welds (36) in an inclined position   obtained by thermofusion or gluing.   8. An improved system according to claim 7, characterized in that said glue is   Preferably, the adhesive is ethyl cyanoacrylate.