Design and method to arrange seam for pipe insulation

FIELD: construction.

SUBSTANCE: seam design for overlapping (5', 5) from an aluminium foil designed to cover and simultaneously close a cut (2', 2) in a section (1', 1) of pipe insulation from mineral wool coated with a shell (4', 4) of aluminium foil. Besides, the shell at the side facing the mineral wool is coated with a layer (8', 8) of polyethylene, by means of which it is attached to the outer layer of mineral wool of an insulating section. Besides, a double-sided adhesive tape (7', 7) is applied as overlapping onto the layer (8', 8) of polyethylene to fix the overlap (5', 5) to the foil of the shell (4', 4) arranged at the other side of the cut in the insulating section. On both sides of the double-sided adhesive tape (7) there is one and the same adhesive composition, and one of the tape sides is connected to the layer (8) of polyethylene on the inside of the overlap (5) of the shell (4) of the aluminium foil, when the polyethylene layer is in melted condition. The invention also relates to the method for arrangement of the above seam for overlapping.

EFFECT: reduced total fire load, reduced total weight.

7 cl, 4 dwg

 

The present invention relates to the construction of the seam to overlap of aluminum foil, designed to close and simultaneously to close the incision in the section of pipe insulation from the foil mineral wool. Shell of aluminum foil from the inside, i.e. from the side facing the mineral wool covered with a layer of polyethylene, whereby it is fastened to the outer layer of mineral wool insulating section. On the overlap of the foil layer of polyethylene imposed double-sided adhesive tape used for fixing overlapping the foil located on the other side of the slit in the insulating section.

The invention also relates to a method of weld for overlapping aluminum foil, designed to close and simultaneously to close the incision in the section of pipe insulation from the foil mineral wool. Shell of aluminum foil from the inside, i.e. from the side facing the mineral wool covered with a layer of polyethylene, whereby it is fastened to the outer layer of mineral wool insulating section. On the overlap of the foil layer of polyethylene imposed double-sided adhesive tape used for fixing overlapping the foil located on the other side of the slit in the insulating section.

The level of technology

The section of pipe insulation has a longitudinal mounting section. After installation is key to the pipe section serves a longitudinally elongated overlapping the insulating shell section, console posted from one of the edges of the incision. If the insulating section has a shell made of aluminum foil, overlapping traditionally close on the double-sided adhesive tape, which from different sides covered with adhesives with different characteristics, adhesion. For the formation of the seam, take a strip of double-sided tape and cut the size of overlap. Remove the protective paper on one side of the adhesive tape, then stick the tape on the inside surface of the shell of aluminum foil. On the other side of the protective paper tape do not touch. On site installation of insulating partition after you install it on the pipe, remove the protective paper from the second side of the adhesive tape, then stick the overlap of aluminum foil to the front surface of the shell on the other side of the slit in the insulating section.

Double-sided adhesive tape used in conjunction with pipe insulation and sheath of aluminum foil, usually made on the basis of acrylic, rubber or hot melt. To weld the required flow of the tape is of the order of 100 g/m2. Structurally, this double-sided tape is a package of two adhesive layers and the base layer between them. As typical examples, the tape, in which the bearing layer is a film of polyethylene or polyester, the adhesive is a layer for bonding to the surface of the aluminum foil is made of glue, designed to work at temperatures down to -18°C, and an adhesive layer for adhesion to the polyethylene made from glue, designed for adhesion to plastics with low surface energy. In the known solutions as the adhesive layer for aluminum foil is used, for example, acrylic adhesive, and as a layer of polyethylene used, for example, a modified acrylic adhesive.

Known double-sided tape, as described above, in General, solve the tasks set before them, but have several disadvantages. First, a separate supporting layer (e.g., polyethylene film) increase the fire load. Secondly, the combined use of the base layer and two different types of glue not only increases the fire load, but also the cost. It is therefore desirable to eliminate both of these circumstances.

Description of the invention

The present invention is to eliminate the above drawbacks and to provide a more economical and with low fire load of a seam construction for a free overlapping sections of pipe insulation in the shell of aluminum foil.

The inventive design of the weld is characterized by the fact that double-sided adhesive tape on both sides coated with the same adhesive composition, as well as the fact that one of the parties to the ribbon attached to a layer of polyethylene on the wrong side of the overlap that the PTO is t, when the polyethylene is in the molten state.

In a preferred embodiment of a seam according to the present invention, the tape is a single layer of material in the form of a strip. In another preferred embodiment, the seam adhesive composition contains a single adhesive agent. Most return the present invention provides in that case, if a single layer of material and the only adhesive agent containing adhesive of the dissolved acrylic.

In the second preferred embodiment, the material layer is, for example, a composite material in the form of strips of material based on rubber, and one or more adhesive agents.

Next, a method of performing a seam according to the present invention differs in that the layer of polyethylene on converted to mineral wool side of the shell of aluminum foil lead in the molten state, and the double-sided adhesive tape, on both sides of which have the same adhesive composition, stick to the polyethylene layer overlap, while this layer is melted.

In a preferred embodiment of the proposed method the tape is attached by pressing it to a layer of polyethylene on the overlap at the same time, when aluminum foil is already bonded to the mineral wool insulation section, p is preseut at the other end, which forms the overlap, and available on the overlap of the layer of molten polyethylene.

The present invention allows to reduce the total fire load (the total mass of combustible substances), as in the inventive suture construction uses only the adhesive agent, and the supporting layer is completely missing, which reduces the overall weight.

Detailed description of the invention

The following examples describe the invention with reference to the accompanying drawings.

Figure 1 shows a cross-section of the section of pipe insulation, loose overlap which is mounted on a double-sided adhesive tape.

Figure 2 schematically shows in sectional view free the overlap of known type with a three-layer double-sided adhesive tape.

Figure 3 schematically shows a section of the inventive tape and its fastening to a free lap.

Figure 4 illustrates the device test stand for measuring the strength of the seam traditional and inventive designs.

In the following examples, mineral wool, which are made of sections of pipe insulation, both known and according to the invention, contains stone wool.

Known from the prior art section 1' of pipe insulation, shown in figure 1, has the entire length of the longitudinal mounting section 2' layer 3' of stone wool. The outer surface is essentially truncator the layer 3' of stone wool section 1' coated 4 of aluminum foil, with wrong side facing the layer of mineral wool, foil coated with a layer 8' polyethylene. Melting the layer of polyethylene, secure shell 4' to the cylindrical main surface of the layer of mineral wool so that it essentially covers this outer surface entirely, so that on one side of the section 2' she was cut essentially flush with the plane faces of the cut in the layer 3' mineral wool to which it is attached, while on the other side of the section 2' she stood against the edge of the incision perpendicular to the plane of its face, forming a loose overlapping 5' (may also be called Fuld), elongated along a section of pipe insulation throughout her length. On the inner side of the layer 3' mineral wool has along its length a longitudinal slot 6'.

According to known solutions, the layer 8' polyethylene free-overlapping 5' shell 4' aluminum foil section 1' of pipe insulation, shown in figure 1, attached double-sided adhesive tape 7', extending along the long sides overlapping, i.e. along the axis of the section. This tape is used to perform the seam of the prior art, shown in figure 2 and has three separate layers: adhesive layers A' and B', as well as supporting layer C' between them. The adhesive layer And has good adhesion to the aluminum foil, even at low temperatures, whereas the adhesive layer B has good adhesion to plastics with low surface energy, for example, polyethylene. Supporting layer C' is made, for example, of polyester (polyethylenterephtalate) film.

Figure 3 shows a double-sided adhesive tape 7 to perform a seam according to the present invention, attached to the inner layer 8' polyethylene shell 4' aluminum foil, and the rest of the device isolation sections 1' does not differ from known (shown in figure 1). Double-sided tape 7 according to the invention preferably consists of a single layer And material, namely, divorced acrylic adhesive in the form of a strip, for example, such an acrylic adhesive, which is applied on the adhesive side of the bilateral polyethylenterephtalate type tape TR4049G company Stokvis Tapes Sverige AB, which retains the ability to adhesion at low temperatures down to -18°C. the surface of the acrylic adhesive can be protected any suitable overlay, well-known experts, such as paper with a silicone coating.

Double-sided adhesive tape 7 to perform a seam according to the invention attached to a layer of polyethylene on the reverse side lap 5 of the shell 4 of aluminum foil in the moment when the polyethylene is in the molten state. It is preferable to press the tape to the layer of polyethylene at the same time as aluminum foil, is attached to a layer of mineral wool isolated the processes section, cut to side, forming the overlap for the circuit section and the molten polyethylene.

After installation of the section 1' of the pipe section 2' is served free overlapping 5' shell 4', which first remove the protective cover from the double-sided adhesive tape 7, made according to the invention, and then press the overlap of 5 to attach it to the underlying shell 4' aluminum foil on the other side of the section 2'.

In the following table 1 shows the test results for the tear tape (samples 6-10)attached to the plastic layer of an aluminum shell in its molten state, and tapes (samples 1-5)attached to the surface of a solid polyethylene.

Table 1: pull-out test
Tape1+ polyethyleneThe average force (F) N
Sample12345
The force F (H)87 7767
Tape1+ molten polyethylene
Sample678910
The force F (H)111110101010
1. Tape bill type, from a single layer of acrylic glue.

Conclusion: fixing the tape to the plastic layer overlap in its molten state increases the strength of the weld is approximately 50%.

Stand for testing, the results of which are given in table 1, is shown in figure 4.

1. The seam construction for overlap (5', 5) aluminum foil designed to close and simultaneously to close the incision (2', 2) partition (1', 1) pipe insulation mineral wool coated (4', 4) aluminum foil, and cover with the side facing the mineral is th cotton, covered with a layer (8', 8) polyethylene, whereby it is fastened to the outer layer of mineral wool insulating section, and the overlap layer (8', 8) polyethylene imposed double-sided adhesive tape (7', 7)intended for fastening the overlapping (5', 5) to the foil wrapper (4', 4), located on the other side of the slit in the insulating section, characterized in that on both sides of double-sided adhesive tape (7) has the same adhesive, and one of the sides of the tape attached to the layer (8) of polyethylene on the underside of the overlap (5) shell (4) of the aluminum foil when the plastic layer is in the molten state.

2. The seam construction according to claim 1, characterized in that the tape (7) is a strip made of a single layer of material.

3. The seam construction according to claim 2, characterized in that the adhesive composition contains one adhesive agent.

4. The seam construction according to claim 3, characterized in that used in the single layer of material, and only the adhesive composition are acrylic based adhesive solvent.

5. The seam construction according to claim 2, characterized in that the layer of material is a composite material in the form of a strip, made of a material based on rubber and one or more adhesive agents.

6. Way to weld for n is clesta (5', 5) aluminum foil designed to close and simultaneously to close the incision (2', 2) partition (1', 1) pipe insulation mineral wool coated (4', 4) aluminum foil, and cover with the side adjacent to mineral wool, covered with a layer (8', 8) polyethylene, whereby it is fastened to the outer layer of mineral wool insulating section, and the overlap layer (8', 8) polyethylene imposed double-sided adhesive tape (7', 7), designed for fastening the overlapping to the foil wrapper (4', 4), located on the other side of the slit in the insulating section, characterized in that the layer (8) of the polyethylene on the side-lap (5) shell (4), converted to mineral wool, lead in the molten state, and one side of the double-sided adhesive tape (7), on both sides of which have the same adhesive, attach to the layer (8) polyethylene, while this layer is in the molten state.

7. The method according to claim 6, characterized in that to join press the tape (7) to the layer (8) polyethylene overlap (5) of the aluminum foil while the foil (4), already attached to a section of pipe insulation made of mineral wool, cut on the other end, which forms the overlap, and the molten polyethylene.



 

Same patents:

FIELD: fire safety.

SUBSTANCE: device contains two parts made with the possibility of connection established compactly to each other and towards the pipeline and surrounding joint, bolt or items like that. The connected pieces are formed by a perforated plate (6) from stainless steel by means of fire-resistant insulation coating (7, 8) of epoxy material made with the possibility of thermal expansion, and deposited on the inner side or outer side or on both sides, at that one of the edges of the connected parts, located opposite each other, contains an internal fishplate (9) with flame-retardant insulating coating (8) and is made with the possibility to close the seam between two parts.

EFFECT: prevention of breakthrough of hot gases into the connected parts.

3 cl, 3 dwg

FIELD: machine building.

SUBSTANCE: procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with different diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing -rotating body of a cylinder shape or a pipe-casing of a composed structure. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. A layer of heat insulation is poured. Further mixture is conditioned; and process plugs are removed. The set of pipe diminishing pieces is made within the range of diametre values of working pipe branches with smaller diametre from 25 to 230, mainly from 32 to 219 mm and selectively correlating to them branches of the working pipe of bigger diametre within the range from 35 to 435, mainly from 45 to 426 mm. Thus there are created from two to ten, preferably, to six combinations of the latter with the same branch of the working pipe of smaller diametre. Also for the diminishing piece with branches of the working pipe of bigger diametre within range from 45 to 60 mm the pipe diminishing piece has hydro-insulation of a circular-cylinder configuration with invariable external diametre along whole length of a heat-insulated part of the diminishing piece. Notably, volume of the least heat insulated section is protected with the heat insulated layer. Specific volume protection of the latter related to a unit of payload volume of conditional running metre of a corresponding branch is not less, than 4.0. Interval change from 12.5-1.0 to 2.5-0.6 of volume protection of the working pipe with heat-insulating material is facilitated for pipe diminishing pieces with hydro-insulation in form of composed shape casing. The first interval is ratio of specific volume of heat insulation to a unit of payload volume of conditional running metre of the smallest diametre of the working pipe branch connected in the diminishing piece, while the second interval is the same for the branch of a bigger diametre. The complete set of items for the heat-hydro-insulated pipeline includes items each consisting of the working pipe, of the layer of heat insulation and of external hydro-insulation. It also includes the set of pipe diminishing pieces Notably, each diminishing piece with hydro-insulation in form of the pipe-casing is conditionally identical to shape of the diminishing piece with diametre exceeding relative diametres of the said working pipe diminishing piece by thickness required and sufficient to the protective layer of heat insulation arranged underneath; also the layer is formed out of two-component foamed solidificated mixture of calculated density in the middle of the layer not less, than 60 kg/m3. The complete set is equipped with wires of the on-line remote control system.

EFFECT: versatility, process simplicity and efficiency of fabrication.

24 cl, 17 dwg

FIELD: machine building.

SUBSTANCE: invention refers to machine building, particularly to procedures of fabricating heat-hydro-insulated diminishing pieces used for connecting pipelines of different diametres. Procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with different diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing of a composed structure conditionally similar by shape to working pipe subs. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. At least two-component foamed solidificated mixture is poured as a layer of heat insulation. Further mixture is conditioned; and process plugs are removed. The set of diminishing pieces is fabricated within the range of values of diametres of working pipe branches of smaller diametre from 200 to 950, mainly from 219 to 920 mm and within the range of values of diametres of working pipe branches of bigger diametre from 250 to 1050, mainly from 273 to 1020 mm. The set of diminishing pieces of working pipe branches of smaller diametre selectively correlates to the set of diminishing pieces of working pipe branches of bigger diametre. There are made from one to ten, preferably, to five combinations of the latter with the same branch of the working pipe of smaller diametre. There is facilitated volume protection of the working pipe with heat-insulating material. Volume protection is calculated from ratio of specific volume of heat-insulation to a unit of payload volume of a conditional running metre of the working pipe of each branch connected with a diminishing piece not over 1.4 at the section of diminishing piece of smaller diametre, and not below 0.25 at the section of bigger diametre. Also at least part of pipe diminishing pieces hydro-insulated with polymer or polymer containing material is designed to facilitate volume protection of the working pipe calculated from ratio of specific volume of hydro-insulation to a unit of payload volume of conditional running metre of the working pipe of each branch connected in the diminishing piece not over 0.17 at the section of diminishing piece of smaller diametre, and not below 0.08 at the section of bigger diametre. The complete set of items for the heat-hydro-insulated pipeline consists of items each containing a working pipe or branches of the working pipe, of a layer of heat insulation and of external hydro-insulation. Further, the complete set includes the set of pipe diminishing pieces fabricated according the above described procedure. Each diminishing piece contains a sub of working pipes, and hydro-insulation in kind of a pipe-shell of a complex form conditionally identical to the sub of working pipes in diametre correspondingly exceeding diametres of the said subs of the working pipes at thickness required and sufficient for underneath placement of a protective layer of hydro-insulation. This protective layer of heat-insulation consists of at least two-component foamed solidificated mixture. In the middle of the layer this mixture has calculated density not less, than 60 kg/m3. The complete set is equipped with wires of the on-line remote control system.

EFFECT: facilitating versatility, process simplicity and efficiency of items production, design of which ensures reduced heat losses and increased reliability of pipeline operation in whole.

25 cl, 16 dwg

FIELD: machine building.

SUBSTANCE: invention refers to machine building, particularly to procedures of fabricating heat-hydro-insulated diminishing pieces and to designs of heat-hydro-insulated diminishing pieces proper. Procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with different diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing of a composed structure conditionally similar by shape to working pipe subs. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. At least two-component foamed solidificated mixture is poured as a layer of heat insulation. Further mixture is conditioned; and process plugs are removed. Set of pipe diminishing pieces is fabricated within ranges of values of diametres of working pipe branches with smaller diametres from 200 to 950, preferably, from 219 to 920 mm and selectively correlating to them in ranges of diametres of working pipe branches with bigger diametres from 250 to 1050, preferably, from 273 to 1020 mm. Thus there are created combinations of from one to ten, preferably, to five diminishing pieces with the same branch of the working pipe of smaller diametre. Also there is facilitated volume protection of working pipe with heat-insulating material. Volume protection is calculated from ratio of specific volume of heat-insulation to a unit of payload volume of conditional running metre of the working pipe of each branch connected in a sub at the section of change from smaller diametre - not above 1.4, and not below 0.25 at the section of bigger diametre. Also, at least part of pipe diminishing pieces with ratio of diametres of the pipe-casing bigger to smaller from 1.29 are made with hydro-insulation in form of a casing of complex structure out of work-pieces of the pipe-casings of bigger and smaller diametres by means of cutting. For this purpose cylinder not-flat wedges are cut out in a near-end zone of the branch of bigger diametre. Between each two nearest cuts there is left a cylinder blade. Side facets of adjacent blades are joined, mainly, by welding, and the branch of smaller diametre is connected, mainly, by welding. The complete set of items for the heat-hydro-insulated pipeline includes items each consisting of the working pipe or branches of the working pipe, of the layer of heat insulation and of external hydro-insulation. It also includes the set of pipe diminishing pieces. Notably, each diminishing piece contains sub of working pipes with hydro-insulation in form of the pipe-casing exceeding relative diametres of the said working pipe diminishing piece by thickness required and sufficient to the protective layer of heat insulation arranged underneath; also the layer is formed out of two-component foamed solidificated mixture of calculated density in the middle of the layer not less, than 60 kg/m3. The complete set is equipped with wires of the on-line remote control system.

EFFECT: facilitating versatility, process simplicity and efficiency of production.

25 cl, 16 dwg

FIELD: machine building.

SUBSTANCE: invention refers to machine building, particularly to procedures of fabricating heat-hydro-insulated diminishing pieces and also for proper designs of heat-hydro-insulated diminishing pieces used for connecting pipelines of different diametres and for connecting branches with simultaneous change of one diametre of pipeline to another. Procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with different diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing of a composed structure conditionally similar by shape to working pipe subs. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. At least two-component foamed solidificated mixture is poured as a layer of heat insulation. Further mixture is conditioned; and process plugs are removed. Set of pipe diminishing pieces is fabricated within ranges of values of diametres of working pipe branches with smaller diametres from 200 to 950, preferably, from 219 to 920 mm and selectively correlating to them in ranges of diametres of working pipe branches with bigger diametres from 250 to 1050, preferably, from 273 to 1020 mm. Thus there are created combinations of from one to ten, preferably, to five diminishing pieces with the same branch of the working pipe of smaller diametre. Also there is facilitated volume protection of working pipe with hydro-insulating material. Volume protection is calculated from ratio of specific volume of hydro-insulation to a unit of payload volume of conditional running metre of the working pipe of each branch connected in a sub at the section of change from smaller diametre - not above 0.17, and not below 0.08 at the section of bigger diametre. Also at least part of pipe diminishing pieces with ratio of diametres of the pipe-casing bigger to smaller from 1.29 are made with hydro-insulation in form of a casing of complex structure out of work-pieces of the pipe-casings of bigger and smaller diametres by means of cutting. For this purpose cylinder not-flat wedges are cut out in a near-end zone of the branch of bigger diametre. Between each two nearest cuts there is left a cylinder blade. Side facets of adjacent blades are joined, mainly, by welding, and the branch of smaller diametre is connected, mainly, by welding. Each diminishing piece made according to this procedure consists of pipe sub and of hydro-insulation in form of the pipe-casing of complex structure conditionally identical to shape of the diminishing piece with diametre exceeding relative diametres of the said working pipe diminishing piece by thickness required and sufficient to the protective layer of heat insulation arranged underneath; also the layer is formed out of two-component foamed solidificated mixture of calculated density in the middle of the layer not less, than 60 kg/m3. Each diminishing piece is equipped with wires of the on-line remote control system.

EFFECT: facilitating versatility, process simplicity and efficiency of production of set of heat-hydro-insulated pipe diminishing pieces, design of which ensures reduced heat losses and increased reliability of pipeline operation in whole.

24 cl, 16 dwg

FIELD: machine building.

SUBSTANCE: invention refers to machine building, particularly to procedures of fabricating heat-hydro-insulated diminishing pieces and to designs of heat-hydro-insulated diminishing pieces proper. Procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with different diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing of a composed structure conditionally similar by shape to working pipe subs. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. At least two-component foamed solidificated mixture is poured as a layer of heat insulation. Further mixture is conditioned; and process plugs are removed. Set of pipe diminishing pieces is fabricated within ranges of values of diametres of working pipe branches with smaller diametres from 200 to 950, preferably, from 219 to 920 mm and selectively correlating to them in ranges of diametres of working pipe branches with bigger diametres from 250 to 1050, preferably, from 273 to 1020 mm. Thus there are created combinations of from one to ten, preferably, to five diminishing pieces with the same branch of the working pipe of smaller diametre. There is facilitated volume protection of the working pipe with hydro-insulating material. Volume protection is calculated from ratio of specific volume of hydro-insulation to a unit of payload volume of a conditional running metre of the working pipe of each branch connected with a diminishing piece not over 0.17 at the section of diminishing piece of smaller diametre, and not below 0.08 at the section of bigger diametre. Also at least part of pipe diminishing pieces with ratio of diametres of the pipe-casing bigger to smaller up to 1.3 are made with seamless hydro-insulation out of work-pieces of the pipe-casings of preferably round-cylinder configuration of smaller diametre by means of non-destructive increase of diametre with specified gradient of increment per unit of axial height of transient zone into time unit and with at least partially compensated decrease of wall thickness while re-distributing material in a deformed zone of the pipe diminishing piece. Each diminishing piece made according to this procedure consists of pipe sub and of hydro-insulation in form of the pipe-casing of complex structure conditionally identical to shape of the diminishing piece with diametre exceeding relative diametres of the said working pipe diminishing piece by thickness required and sufficient to the protective layer of heat insulation arranged underneath; also the layer is formed out of two-component foamed solidificated mixture of calculated density in the middle of the layer not less, than 60 kg/m3. Each diminishing piece is equipped with wires of the on-line remote control system.

EFFECT: facilitating versatility, process simplicity and efficiency of production of set of heat-hydro-insulated pipe diminishing pieces, design of which ensures reduced heat losses and increased reliability of pipeline operation in whole.

24 cl, 16 dwg

FIELD: machine building.

SUBSTANCE: invention refers to machine building, particularly to procedures of fabricating heat-hydro-insulated diminishing pieces and to designs of heat-hydro-insulated diminishing pieces proper. The procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with different diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing of a composed structure conditionally similar by shape to working pipe subs. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. At least two-component foamed solidificated mixture is poured as a layer of heat insulation. Further mixture is conditioned; and process plugs are removed. Set of pipe diminishing pieces is fabricated within ranges of values of diametres of working pipe branches with smaller diametres from 25 to 230, preferably, from 39 to 219 mm and selectively correlating to them in ranges of diametres of working pipe branches with bigger diametres from 65 to 435, preferably, from 76 to 426 mm. Thus there are created combinations of from one to ten, preferably, to six of the latter with the same branch of the working pipe of smaller diametre. Also there is facilitated change of volume protection of working pipe with hydro-insulating material from 1.5 - 0.16 to 0.3-0.1. Here the first interval is ratio of specific volume of hydro-insulation to a unit of payload volume of a conditional running metre of a smaller diametre of a working pipe branch connected in a diminishing piece, while the second is the same for a branch of a bigger diametre, where change of volume protection of the working pipe with heat-insulating material is facilitated within 12.5-1.0 to 2.5-0.6. The first interval is ratio of specific volume of heat-insulation to a unit of payload volume of a conditional running metre of a smaller diametre of a working pipe branch connected in a diminishing piece, while the second is the same for a branch of a bigger diametre, where change of volume protection of the working pipe with heat-insulating material is facilitated within 12.5-1.0 to 2.5-0.6. The first interval is ratio of specific volume of heat-insulation to a unit of payload volume of a conditional running metre of a smaller diametre of a working pipe branch connected in a diminishing piece, while the second is the same for a branch of a bigger diametre. The complete set of items for the heat-hydro-insulated pipeline includes items each consisting of the working pipe or branches of the working pipe, of the layer of heat insulation and of external hydro-insulation. It also includes the set of pipe diminishing pieces Notably, each diminishing piece with hydro-insulation in form of the pipe-casing of complex structure conditionally identical to shape of the diminishing piece with diametre exceeding relative diametres of the said working pipe diminishing piece by thickness required and sufficient to the protective layer of heat insulation arranged underneath; also the layer is formed out of two-component foamed solidificated mixture of calculated density in the middle of the layer not less, than 60 kg/m3. The complete set is equipped with wires of the on-line remote control system.

EFFECT: facilitating versatility, process simplicity and efficiency of production.

24 cl, 16 dwg

FIELD: machine building.

SUBSTANCE: according to invention assembly for fabrication of complete set of items for heat-hydro-insulated pipeline consists of process posts mounted on foundation, successively arranged and communicated between them; these posts form not less, than two process lines fabricating set of pipe-casings, pipe-work pieces for fittings - couplings, Z and "П"-shaped elements of pipelines, pipe diminishing pieces, branches, and also work pieces for couplings and for hydro-insulating multi-purpose accessories of pipelines within ranges from 120 to 750 mm including partially shut-off internal range from 300 to 330 mm. Also the assembly consists of the post for preparation of working pipes, for example metallic pipes, preferably, steel ones, of the post of assembling the structure pipe-in-pipe and of the post for pouring solidificated filling mixture. Mixture consists out of at least polyol component and isocyanate. At least one line additionally contains a system of start-up. The complete set of items for the heat-hydro-insulated pipeline consists of heat-hydro-insulated pipes, of fittings including heat-hydro-insulated Z and "П"-shaped elements, of pipe diminishing pieces, of branches, for example T-joints, and also of heat-hydro-insulated shut-off accessories and couplings of hydro-insulation fabricated by means of the assembly. Each heat-hydro-insulated item is made with calculated density of a heat-insulating layer not less, than 60 kg/m3. Assembly of structures pipe-in pipe included to the complete set is performed not earlier, than in twenty four hours upon fabrication of hydro-insulation: pipe-casing or pipe-work piece for a fitting, of a work-piece for hydro-insulation for all purpose accessories.

EFFECT: design of integrated universal assembly uniting process posts facilitating integrated process for fabricating complete set of items for heat-hydro-insulated pipeline; increased process simplification and efficiency of items production for heat-hydro-insulated pipeline.

25 cl, 17 dwg

FIELD: machine building.

SUBSTANCE: procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with various diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing of a sectional structure conditionally identical by shape to working pipe subs. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. At least two-component foamed solidificated mixture is poured as a layer of heat insulation. Further mixture is conditioned; and process plugs are removed. Set of pipe diminishing pieces is fabricated within ranges of values of diametres of working pipe branches with smaller diametres from 25 to 230, preferably, from 38 to 219 mm and branches with bigger diametres from 65 to 435, preferably, from 76 to 426 mm selectively correlating to them in ranges of diametres of working pipe. Thus there are created combinations of from one to ten, preferably, to six diminishing pieces with the same branch of the working pipe of smaller diametre. Change of insulation of working pipe volume with hydro-insulating material is from 1.5-0.16 to 0.3-0.1, wherein the first interval is ratio of specific volume of hydro-insulation to a unit of payload volume of reference running metre of a smaller diametre pipe branch connected in the pipe sub. The second interval is ratio of specific volume of hydro-insulation to a unit of payload volume of reference running metre of a bigger diametre pipe branch. Also at least part of pipe diminishing pieces with ratio of bigger to smaller diametres of the pipe-casing from 1.29 are made with hydro-insulation in form of a casing of the sectional structure out of work-pieces of the pipe-casings of bigger and smaller diametres. For this purpose cylinder not-flat wedges are cut in a near-end zone of the branch of bigger diametre. Between each two nearest cuts there is left a cylinder blade. Side facets of adjacent blades are joined, mainly by welding, and the branch of smaller diametre is connected, mainly by welding. The complete set of items for the heat-hydro-insulated pipeline includes items each consisting of the working pipe or branches of the working pipe, of the layer of heat insulation and of external hydro-insulation. It also includes set of pipe diminishing pieces fabricated by the above described procedure. Notably, each diminishing piece consists of working, preferably, metallic pipes sub and of hydro-insulation in form of the pipe-casing of the sectional structure conditionally identical to shape of the diminishing piece with diametre exceeding relative diameters of the said working pipe diminishing piece by thickness required and sufficient to the protective layer of heat insulation arranged underneath; also the layer is formed out of two-component foamed solidificated mixture of calculated density in the middle of the layer not less, than 60 kg/m3, and it is equipped with wires of the on-line remote control system.

EFFECT: facilitating versatility, process simplicity and efficiency of items production, design of which ensures reduced heat losses and increased reliability of pipeline operation in whole.

24 cl, 16 dwg

FIELD: machine building.

SUBSTANCE: procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with various diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing of a sectional structure conditionally identical by shape to working pipe subs. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. At least two-component foamed solidificated mixture is poured as a layer of heat insulation. Further mixture is conditioned; and process plugs are removed. Set of pipe diminishing pieces is fabricated within ranges of values of diametres of working pipe branches with smaller diametres from 25 to 230, preferably, from 38 to 219 mm and branches with bigger diametres from 65 to 435, preferably, from 76 to 426 mm selectively correlating to them in ranges of diametres of the working pipe. Thus there are created combinations of from one to ten, preferably, to six diminishing pieces with the same branch of the working pipe of smaller diametre. Change of insulation of working pipe volume with hydro-insulating material is from 1.5-0.16 to 0.3-0.1, wherein the first interval is ratio of specific volume of hydro-insulation to a unit of payload volume of reference running metre of a smaller diametre pipe branch connected in the pipe sub. The second interval is ratio of specific volume of hydro-insulation to a unit of payload volume of reference running metre of a bigger diametre pipe branch. Also at least part of pipe diminishing pieces with ratio from 1.3 of bigger to smaller of diametres of the pipe-casing are made with seamless hydro-insulation out of work-pieces of the pipe-casings of preferably round-cylinder configuration of smaller diametre by means of non-destructive increase of diametre with specified gradient of increment per unit of axial height of transient zone into time unit and with at least partially compensated decrease of wall thickness while re-distributing material in a deformed zone of the pipe diminishing piece. Each diminishing piece made according to this procedure consists of working, preferably, metallic pipes sub and of hydro-insulation in form of the pipe-casing of the sectional structure conditionally identical to shape of the diminishing piece with diametre exceeding relative diametres of the said working pipe diminishing piece by thickness required and sufficient to the protective layer of heat insulation arranged underneath; also the layer is formed out of two-component foamed solidificated mixture of calculated density in the middle of the layer not less, than 60 kg/m3, and it is equipped with wires of the on-line remote control system.

EFFECT: facilitating versatility, process simplicity and efficiency of production of set of heat-insulating pipe diminishing pieces, design of which ensures reduced heat losses and increased reliability of pipeline operation in whole.

24 cl, 16 dwg

FIELD: machine building.

SUBSTANCE: procedure for fabrication of insulated unit "pipe-in-pipe" consists in following stages: in facilitating unit containing at least one internal pipe and external pipe surrounding at least one internal pipe creating circular space between external surface of at least one internal pipe and internal surface of external pipe. There is also at least one container located in circular space. It contains porous flexible volumetric compressed material of porous particles. It is compressed in the container and has the first volume less, than volume of not compressed material. The procedure also consists in change of at least one container to reduce compression of compressed material to the second volume exceeding the first volume, thus creating an insulating unit "pipe-in-pipe". There are also disclosed versions of the insulating unit "pipe-in-pipe".

EFFECT: improved heat insulation of pipelines.

FIELD: building.

SUBSTANCE: unit (1) of hardened tubular section from production line is finished by cutting its uneven ends off. At least part of cut-off ends (2) of units (1) of the tubular section is crumbled into particles and together with all materials contained in them are re-used in at least one of earlier stages of tubular section production. Cut and crumbled ends (13) are uniformly distributed over not hardened containing binding substance mat (3) out of mineral cotton along its total width prior to its winding around core (16) and forming a tubular section out of it. Also, crumbled cut ends (13) do not get to front and back ends of mat (3). The system consists of at least breaker (10) for crumbling cut ends (12), of shredder (11) with a distributor of crumbled cut ends (13) of transport device (5, 6) for transporting cut ends (2) to a preceding stage of fabrication.

EFFECT: improved procedure.

13 cl, 2 dwg

FIELD: construction.

SUBSTANCE: invention is related to heat insulation of pipes, namely to methods for formation of external heat insulation cover of foaming materials, such as polyurethane foam, on pipes intended for transportation of coolant or freezing liquids. In method of heat insulation of pipe for air, ground and underground installation, previously arranged sections of thin-sheet rolled metal shells are installed concentrically versus insulated pipe, which simultaneously perform functions of heat insulation shape and protective coat, annular cavity between pipe and shell is filled via longitudinal joint of open shell with polyurethane of poured grades, longitudinal joint of shell is closed with overlapping of edges, and heat insulation material is tempered for some time for structuring.

EFFECT: possibility to install heat insulation in the field.

3 dwg

FIELD: construction industry.

SUBSTANCE: according to presented method for forming of, actually, cylindrical insulating blank, cotton-wool is supplied in form of loose material to spacing between core and, actually, cylindrical external form enclosing core. For fixation of form of pipe section blank its inner and outer surfaces are heat-treated by means of heating of at least part of core and external form. Then processing of unprocessed layer located between processed inner and outer surfaces is performed. Forming device contains area of pipe section formation, this area consists of core and, actually, cylindrical external form enclosing it, and also of device for final thermal processing of formable pipe section.

EFFECT: invention provides continuity of process of pipe section forming, absence of waste material, it allows to change length of product depending on customer's requirements.

28 cl, 3 dwg

FIELD: construction.

SUBSTANCE: in method of manufacturing of foam polymer heat insulation on pipes, including installation of insulated pipe in metal mold, made by hingedly joined segments of pipes, filling of gap between pipe and mold with hardening heat-insulating mixture, further exposure until mixture hardens and mold removal, to facilitate air exhaust and reduce formation of fin, prior to heat insulation mixture pouring, insert is installed in mould from sheet material with width that provides for coverage of its long edges with an overlap, and pouring is executed into gap between insert and pipe.

EFFECT: facilitates air exhaust from filled gap and reduced formation of fin.

3 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: proposed flexible pipe consists of at least one inner pipe, one outer pipe and heat-insulating layer from polyurethane or polyisocyanurate foam arranged between aforesaid inner and outer pipes. Note that hollow balls are added to aforesaid foam in the amount of 0.1% to 7.5% by weight. Note also that aforesaid balls are furnished with thermoplastic synthetic material and filled with medium which, at higher temperature, facilitates inflating balls enclosure. Invention covers also the method of producing water supply pipe wherein hollow balls are added to polyol, isocyanate, foaming substance or mix of polyol, and foaming substance isocyanate in mixing chamber.

EFFECT: higher pipe flexibility.

4 cl

FIELD: technological processes.

SUBSTANCE: invention is related to the field of heat insulation of pipelines. In method for manufacture of foamed or blown casing for flexible heat insulated pipeline mixture is made of granulated material based on polyethylene and granulated material based on polyethylene, to which expanding additive is mixed in the form of hollow balls, at that mixture is placed in extruder, melted in it, and melt is extruded in the form of pipe and foamed or blown in process of exiting or after exiting from extrusion nozzle, at that ratio of granulated material based on polyethylene and granulated material on the basis of polyethylene, to which expanding additive is mixed, is between 90:10 and 99:1.

EFFECT: improved performance characteristics.

8 cl, 1 dwg

FIELD: heating.

SUBSTANCE: invention refers to heat insulating element fabricated out of thermo-resistant material, preferably out of mineral cotton and, in particular out of mineral cotton "rockwool"; also heat insulating element (1, 1a) can be inserted into opening of wall, ceiling or covering or similar structure and has at least one opening along linear axis passing through the heat insulating element. At least one tubular cover (3, 3a, 3c) is installed into the opening; this cover is fabricated out of heat resistant fiber material in form of winding, preferably out of mineral cotton and, particularly out of mineral cotton "rockwool", wherein a hot pipe is inserted; notably, fibers of this tubular cover are in essence of two-dimensional orientation in the direction along circumference of the cover.

EFFECT: development of insulating element with upgraded heat-resistant properties.

24 cl, 5 dwg

FIELD: mechanics.

SUBSTANCE: proposed centering support for inner pipe comprises clamp with clamping lock enveloping the inner pipe and posts arranged radially on the clamp to fix the inner pipe position in the outer pipe. Aforesaid clamp is made in plastic material, said posts are made integral with the clamp and represent flat plates fitted along the inner pipe axis. The posts ends accommodate load-bearing blocks, while the clamping lock represents rack arranged on one end of the clamp and bent along the inner pipe surface and mating rack arranged opposite the former rack. There is slot-like passage formed for the rack to pass therein. The cross section of the rack, mating rack and guiding strip features one ledge.

EFFECT: simpler design.

2 cl, 2 dwg

FIELD: transportation, heating.

SUBSTANCE: in water-supply pipe with thermal insulation with at least one inner pipe, thermal insulation layer on the basis of polyurethane foam encompassing inner pipe, film encompassing thermal insulation layer and corrugated outer pipe made of thermoplastic polymer, the thermal insulating material consists of polyurethane foam with partially open pores and with elongation at break not more than 15%. Between thermal insulation layer and film there is resilient intermediate layer made of soft polymer foam which is at least bonded with the film and outer pipe has corrugation with depth of corrugations in the range from 5/D to 12/D and distance between corrugations in the range from 10/D to 25/D where D is external diameter of outer pipe as measured over corrugation top.

EFFECT: increase of pipe flexibility and its thermal-insulating properties improvement.

10 cl, 1 dwg

FIELD: construction.

SUBSTANCE: heat insulation item comprises heat insulation elements of lengthy shape enclosed into a shell, which covers side surfaces of lengthy elements and consists of two flexible sheets. One of the flexible sheets is placed on side surfaces of heat insulation elements, opposite to surfaces that face the insulated object, and the other one is placed at other side surfaces of the lengthy elements. Flexible sheets are connected in gaps between insulating elements with straight sections of metal wire arranged longitudinally to the heat insulating elements. Connection of flexible sheets is made in the form of tacks, stitches of which have identical length and evenly alternate at both surfaces of tacks.

EFFECT: such connection of flexible sheets substantially simplifies the technology of making an item, and increases repairability of the item without dismantling from the insulated object.

4 dwg

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