Conducting polymer sheel for corrugated pipeline (versions)

FIELD: constructional engineering.

SUBSTANCE: invention refers to pipeline design. Piping assembly contains conducting corrugated pipeline, including rising and falling coils, conducting polymer shell arranged along the length of the said corrugated pipeline the aforesaid polymer shell providing conductivity from shell to conducting pipeline having maximum bulk resistivity of about 7×104 Ohm·cm to provide conductivity of electric charge from external surface of polymer shell through conducting polymer shell to conducting metal corrugated pipeline. According to the second version of piping assembly design, the said thermoplastic polymer has minimum tensile strength of about 28 MPa, minimum elongation of about 300%, minimum flexural modulus of about 170 MPa and maximum bulk resistivity about 7×104 Ohm·cm. Assembly is provided with fitting jointed to the said corrugated pipeline on its end.

EFFECT: production of polymer shell of improved conductivity of electric charge to conducting metal corrugated pipeline.

13 cl, 1 dwg, 1 tbl

 

The technical field to which the invention relates.

The invention relates to the construction of pipelines, in particular to conductive polymer membrane for corrugated pipe.

The level of technology

Corrugated pipe or metal hose provides an alternative to rigid piping systems for transporting fluid, such as natural gas. Corrugated pipe is easy to install, and it is useful for applications in many systems. Corrugated pipe provides a simpler and more efficient from the standpoint of the cost of installation due to its unique flexible structure and relatively high strength. However, the flexibility imposes some restrictions. With the increase of the internal pressure of the working liquid within the pipeline structure of the corrugated pipe reacts to pressure. The typical structure of a corrugated pipe starts to expand and lengthen in the direction of its length, when the internal pressure exceeds the strength of the material of the pipeline. Higher pressure of the working fluid causes expansion of the corrugation. The extension of the corrugation leads to a distortion of the original shape and size of the pipeline.

To withstand the high operating pressures of conventional corrugated pipe can b shall be equipped with wire braid. Braid is secured at opposite ends of the corrugated pipe. Braid strengthens the structure of the corrugated pipe, increasing the resistance to extension of the corrugation with increasing internal pressure. Braid is effective in providing resistance to the expansion of the corrugated pipe, thereby providing the possibility of increasing the working pressure. However, the sheath covering the outer diameter of the corrugated pipe, performs a relative movement with respect to Gavrilovna pipeline, which it covers. Piping and braid move relative to each other along the length of corrugated tubing. In applications, when the corrugated pipe is connected with mechanical equipment that generates vibrations that are transmitted by pipeline, relative movement causes wear between the inner side of the braid and the outer surface of the pipeline. The friction between the outer side of the pipe and the inner side braid creates mechanisms of failure that violate the structural integrity of corrugated pipe. Braid cuts and istirahat material the outer surface of the corrugated pipe, which leads to reduction of the permissible pressure of the pipeline to its rupture and the occurrence of leakage of the working fluid environments is.

Another disadvantage of the existing pipeline is that the pipeline is often located inside the shell. In the case of impact on the pipeline of electric charge (for example, from direct or indirect lightning strike) the charge accumulated on the membrane and can burn through the membrane to the pipeline that causes the destruction of the pipeline.

Disclosure of inventions

An embodiment of the invention is the site of the pipeline, including conductive corrugated pipe, comprising coils of elevations and depressions, and a conductive polymer membrane that is located along the length of the corrugated pipe.

Another embodiment of the invention is the site of the pipeline, including conductive corrugated pipe, comprising coils of elevations and depressions, and a conductive thermoplastic polymer shell, located along the length of corrugated tubing. thermoplastic polymer has a minimum tensile strength of about 4000 pounds-force per square inch (28000 kPa), a minimum elongation of about 300%, the minimum modulus of flexibility about 25,000 pounds-force per square inch (170000 kPa) and the maximum volume resistivity of about 7×104Ohm·cm (7×102Ohm·m). At one end of the corrugated pipe is attached to it fitting.

The drawing shows a partial section of the RA is seepage electric charge of the node of the pipeline on the side view.

The implementation of the invention

The drawing shows in side view in partial section of the scattering electric charge of the node 10 of the pipeline. The node 10 of the pipeline includes a pipeline 12 and the conductive shell 14. The pipe 12 may be circular, corrugated pipes made of stainless steel (CSST) for transporting fluid, such as natural gas, liquids, etc. as alternative solutions to the pipeline 12 may be of spiral welded pipe.

The shell 14 is extruded on top of the pipeline 12. Corrugated pipe 12 has an outer surface and an inner surface. The inner surface is usually open to the influence of the working fluid. Corrugated pipe 12 contains a structure that has a changing diameter or coils, which form elevations and depressions alternating sequentially along the length of the corrugated tubing 12. The outer surface is used as a support for the elevations and depressions opposite the inner surface. The elevation consists of a coil with a large outer diameter, and the cavity consists of a coil with a smaller outer diameter.

A conductive shell 14 is located on the outer surface of the corrugated tubing 12. A conductive shell 14 can essentially fill the cavity and cover the elevation at naru is Noah's surface. A conductive shell 14 is located along the length of corrugated tubing 12. The composition of the material of the conductive shell 14 has properties that resist the efforts that deform the material, such as efforts tension and shear. As a result, when the increase of the internal pressure of the working fluid, seeking to expand the corrugated pipe, the conductive shell 14, which is located in the hollows of the outer surface, resists created efforts. A conductive shell 14 prevents the expansion or elongation of the corrugated tubing 12 so that the corrugated tubing 12 is slightly deformed as in the linear dimension and the diameter of the corrugated tubing 12. A conductive shell 14 supports each round corrugated tubing 12. The material of the conductive shell 14 is also elastic and flexible. When bending and deflection of corrugated tubing along the length of the conductive shell 14 bends and flexes together with the corrugated tubing 12.

The thickness of the conductive shell 14 can be modified to increase the resistance to expansion of the pipe or to provide more or less flexibility of the corrugated tubing 12. You can provide different values of the nominal pressure by changing the thickness of the conductive obolos and 14. There is a direct relationship between the thickness of the conductive shell 14 and the nominal pressure value of corrugated tubing 12. The application of the conductive shell 14 on the corrugated pipe 12 increases the value of the nominal pressure of corrugated tubing 12 exceeds the rated pressure of the corrugated tubing 12 without the conductive shell 14. A conductive shell 14 also increases the number of cycles of bending required to cause failure of the metal due to fatigue corrugated pipe 12, and reduces vibrations to reduce the danger of destruction of corrugated pipe 12 due to vibration fatigue.

The conductive shell 14 can be ekstradiroval in the corrugation of the corrugated tubing 12. You can also use other ways of making for the location of the conductive shell 14 on the outer surface of the corrugated tubing 12. In one embodiment, the conductive shell 14 is pumped into the cavity to fill essentially depressions and covering elevations. During extrusion of the conductive shell 14, it is essentially in the molten state and flows down into the corrugation of the corrugated tubing 12. Molten conductive shell 14 is cooled by the corrugated tubing 12. The molten material is essentially completed yet basin and covers exaltation. In an alternative embodiment, the polymeric conductive shell 14 ekstragiruyut in the corrugation, and then subjected to curing (e.g., by heating).

The conductive shell 14 can be applied so that the conductive shell 14 is connected essentially with the entire outer surface of the corrugated pipe. Not mandatory connection of the conductive shell 14 with the outer surface may be a mechanical connection, or chemical compound, so that the conductive shell 14 is essentially glued to the outer surface of the corrugated tubing 12. In addition, due to the position within the depressions of the conductive shell 14 is mechanically blocks the deformation of the corrugated pipe 12 due to the material properties of the conductive shell 14. When applied conductive shell 14 with the formation of the adhesion between the conductive shell 14 and the surface of the corrugated tubing 12 there is no relative movement between the conductive shell 14 and the surface of the corrugated tubing 12. The exception of the relative movement between the conductive shell 14 and the outer surface of the corrugated tubing 12 eliminates essentially the mechanism of abrasive wear while providing reinforcement against the pressure.

In an alternative embodiment, provocado the shell 14 ekstragiruyut on top of the corrugated tubing 12, but not pump in hollow corrugated pipe. A conductive shell 14 covers the elevation of the corrugated tubing 12, but is not included in the basin.

A conductive shell 14 may be made of conductive, thermoplastic polymer, such as thermoplastic compound polyurethane based on polyester. You can use other thermoplastics for the shell 14, and the invention is not limited to polyurethane. The polymer preferably has the following properties.

Table a
PropertyMethodValue
Tensile strengthASTM D638minimum of about 28 MPa
ExtensionASTM D638minimum 300%
Bending modulusASTM D790minimum of about 170 MPa
Specific volume resistanceASTM D257a maximum of about 7×102Ohm·m

In an alternative embodiment, the conductive shell is made of thermoplastic polyurethane having the characteristics shown in table A. the Polyurethane coating can connect with corrugated tubing 12, as indicated above.

On one or both ends at the La pipeline provided by the fittings 16. Fittings 16 may be existing fittings for corrugated stainless steel piping (CSST), such as disclosed in U.S. patent No. 5799989, 6079749, 6276728, the full content of which is included in this description. End fittings are preferably made of metal (e.g. brass).

Because the shell 14 is made of thermoplastic material, the electric charge accumulated on the membrane 14 (for example, by direct or indirect lightning strike), is conducted through the shell 14 to the pipe 12, and then to the terminal fittings 16 and the components connected to the fitting 16. Thus, the pipe 12 is not damaged by the accumulation of electrical charge on a non-conductive shell.

The site of the pipeline can be used for various applications, including residential or commercial, interior or exterior, above-ground or underground installation, where there is a possibility of lightning (direct or indirect) or other causes accumulation of electric charge.

Although there have been shown and described preferred embodiments of the, various modifications and substitutions without departing from the idea and scope of the invention. In accordance with this, it should be understood that the description of the present invention are given as illustrations and not as limitations.

1. The site of the pipeline containing the conductive Gavrilovna the pipeline, including the coils of elevations and depressions, conductive polymer membrane located at the specified length of corrugated tubing, with specified polymer shell that provides the conductivity of the shell for conducting the pipeline has a maximum volume resistivity of about 7·102Ohm·m to ensure the conduction of electric charge from the outer surface of the polymer shell through conductive polymer membrane for conducting metal Gavrilovna pipeline.

2. The site of the pipeline according to claim 1, wherein said corrugated pipe is annular.

3. The site of the pipeline according to claim 1, wherein said corrugated tubing is coiled.

4. The site of the pipeline according to claim 1, in which the specified polymer shell is a thermoplastic polymer.

5. The site of the pipeline according to claim 4, wherein said thermoplastic polymer is a polyurethane based on polyester.

6. The site of the pipeline according to claim 4, wherein said thermoplastic polymer is polyethylene.

7. The site of the pipeline according to claim 4, wherein said thermoplastic polymer has a minimum tensile strength of about 28 MPa.

8. The site of the pipeline according to claim 4, wherein said thermoplastic polymer has a minimum elongation of about 300%.

9. The knot of Trubar the water according to claim 4, wherein said thermoplastic polymer has a minimum bending modulus of about 170 MPa.

10. The site of the pipeline according to claim 4, wherein said thermoplastic polymer has a maximum specific volume resistance of about 7·104Ohm·m

11. The site of the pipeline according to claim 1, in which the specified conductive polymer membrane is essentially fills these cavities and essentially covers the specified elevation.

12. The site of the pipeline according to claim 4, further containing a fitting connected to the specified corrugated pipe on its end.

13. The pipeline node containing conductive corrugated pipe, comprising coils of elevations and depressions, a conductive thermoplastic polymer shell located at the specified length of corrugated tubing, with the specified thermoplastic polymer has a minimum tensile strength of about 28 MPa, minimum elongation of about 300%, minimum bending modulus of about 170 MPa and the maximum specific volume resistance of about 7·104Ohm·m; and

the fitting connected to the specified corrugated pipe on its end.



 

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