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INVENTION
Russian Federation Patent RU2249756
METHOD heat and waterproofing PIPES
Name of the inventor: Antony Costa (RU)
The name of the patentee: Closed Joint Stock Company "MosFlowline" (RU)
Address for correspondence: 127599, Moscow, ul.Izhorskaya, 6, JSC "Mosflowline," CEO Anthony Costa
Starting date of the patent: 2000.11.10
The invention relates to pipe insulation products. The technical result of the invention is the intensification of the process, namely to ensure a uniform distribution of the thermal insulation layer of the pipe perimeter and quality control. The method of waterproofing and heat pipes, which includes installation, sealing and coating the sheath pipe insulating compositions, its foaming and curing, as an insulating composition using a liquid polyurethane foam composition, and coating the steel pipe is carried out by insulating compositions preset centering it on the supports of polyethylene simultaneous laying conductors indicator, then combine axis waterproofing membrane and the tube, pulling it to the pipe with a defined centering rings resulting construct "pipe in pipe" is fed to the furnace temperature control, which produces its heating, and the furnace tube construction is fed to an inclined table for pouring polyurethane foam, where previously the ends of the shell are sealed installing plugs air holes up in the annulus produced pouring the composition of polyurethane foam through the filling hole, which, after pouring end is muted, while the foaming polyurethane composition is filled annulus from the bottom up with the simultaneous displacement of it air through the air holes in the top cap, after foaming polyurethane foam formulation is cured, caps removed, and the ends of the waterproofing material is coated.
DESCRIPTION OF THE INVENTION
The invention relates to a process for coating tubular articles from expandable heat-insulating coating and waterproofing compositions and can be used to heat a subterranean laying channel-free networks.
There is a method of heat and waterproofing of pipes, comprising forming a waterproofing membrane, sealing it in the shell formed, and then applying a liquid insulating composition of the pipe end and the subsequent foaming and curing it [ "Industrial methods of pre-insulation of pipelines rigid polyurethane foam. Union Translation Center of scientific and technical literature and documentation. Translation No. A-6549. M., 1977, p.10].
The disadvantage of this method is the possibility of the foam thickness of the pressure which develops only on the chemical reactions.
The closest to the claimed one is a method of waterproofing and heat pipe comprising installing it inside the waterproofing membrane sealing sheath and subsequent application to a pipe insulating composition, its foaming and curing, and before applying the composition to the pipe insulating sheath is sealed waterproof and create pressure therein order 0.1-0.6 mPa. At the end of the composition of the fill tube is rotated around the axis of 240-300 ° [copyright certificate №1060876, cl. F 16 L 59/14, BI №№46, 83].
A disadvantage of this method is the complexity of the process due to the need for pressure sealing and after pouring tube turning compositions 240-300 ° about an axis to provide uniform distribution of the heat-insulating layer on the surface (circumference) of the tube.
Object of the invention - the intensification of the process, namely to ensure a uniform distribution of the thermal insulation layer around the perimeter of the tube and quality control.
This object is achieved by the fact that according to the method of heat and waterproofing of pipe comprising installing it in a waterproof shell, sealing membrane and coating the pipe insulating composition, its foaming and curing, the polyurethane foam used in the composition of the filling type as an insulating composition, and coating the steel pipe insulating composition is effected by presetting it centering bearings polyethylene simultaneous laying conductors indicator, then combine axis waterproofing membrane and the tube, pulling casing pipe defined centering rings resulting construct "pipe in pipe" is fed to the furnace temperature control, wherein performed its heating to 28 ° C, and the furnace tube construction enters the inclined table with 0-5 ° angle for pouring polyurethane composition, wherein the ends of the sealed envelope by setting up plugs air holes, leaving the cutting tube about 15-25 cm. The annulus is made of polyurethane foam pouring the liquid composition through the injection port, which after muted. During the foaming polyurethane composition is filled annulus upwardly while air flowing out from it through air holes in the top cap formed polyurethane cured for 10-15 minutes, then remove the cap.
Filling the annulus from the bottom up with the simultaneous displacement of his air through the air holes in the top of the plug during the foaming polyurethane composition to ensure uniform distribution of the thermal insulation layer of the pipe around the perimeter, and the selection of incubation temperature before filling the pipe "assembly" and lifting the end of the pipe to the desired angle contributes to a better injection polyurethane composition.
Conductors Indicator designed for the operational system of remote monitoring of the state of foam, ie, detecting areas with high humidity insulation layer.
The process of heat and waterproofing of pipes is carried out as follows: on an isolated steel tube pre-installing the centering poles made of polyethylene (PE) with the simultaneous laying of conductors indicator. The conductors, LEDs, arranged on the surface of the insulated steel pipe, designed for remote monitoring of operational status of the foam, ie, detecting areas with high humidity insulation layer, which can be caused by any infiltration of water through the plastic protective shell, either by leaks from pipelines caused by corrosion.
The prepared pipe in turn sent to the lifting table, which served polyethylene (waterproofing coating) and steel pipes. Then combine the waterproofing membrane and the axis of the steel pipe, pulling the pipe shell with the attached centering rings. The resulting construct "pipe in pipe" is fed into the furnace for temperature control, which produces its heating to 28 ° C, and the furnace design thermostatically controlled pipe enters the inclined table with the angle 0-5 ° C for pouring polyurethane (PUR) compositions. The ends of the shell are sealed by setting up plugs air holes, leaving the issues of the pipe of the order of 15-25 cm. In order to prevent leakage of poured liquid foam formulation and a liquid foamable polyurethane composition, and the foaming mass at the inner side of the rubber plugs mounted annular seal. Further, the annular space is filled polyurethane composition in the injection port. After pouring the filling hole in the cap closed. During the foaming polyurethane composition is filled annulus from the bottom up with the simultaneous displacement of air it through the air holes in the top cap. After foaming the composition is cured for 10-15 minutes and remove the plug, the ends closed waterproofing material.
Using the proposed method will allow the following:
- Intensify the process due to a more uniform raspredeniya insulation layer of the pipe circumference, which is provided by filling the annulus in an upward direction while the displacement of the air out of it, and to ensure minimum loss of heat;
- Thermostated design "pipe in pipe", which improves the quality parameters of pipes;
- Detect areas with high humidity insulation layer, which can be caused by any infiltration of water through the plastic protective shell, either by leaks from pipelines caused by corrosion.
CLAIM
1. A method of waterproofing and heat pipe, comprising a sealing unit in its shell, the shell and sealing pipe insulating coating composition, its foaming and curing, characterized in that as insulating foam composition using a liquid formulation and coating the steel pipe insulating composition effected by presetting it centering bearings polyethylene simultaneous laying conductors indicator, then combine axis waterproofing membrane and the tube, pulling it to the pipe with a defined centering rings resulting construct "pipe in pipe" is fed to the furnace temperature control, which produces its heating and the furnace tube construction flows on an inclined table for pouring polyurethane composition, wherein the pre-ends of the shell are sealed installing plugs air holes up in the annulus is made filling foam composition through the injection port, which, after pouring end is muted, while the foaming polyurethane composition is filled annulus from the bottom up with the simultaneous displacement of air it through the air holes in the top cap, after foaming polyurethane foam composition is cured, remove the plug and cover the ends of the waterproofing material.
2. A method according to claim 1, characterized in that the plugs on the inside of which the rubber seal ring fitted.
3. The method of claim 1, wherein the heating of the resulting construct "pipe in pipe" in the thermostatic oven made up to 28 C.
4. A method according to claim 1, characterized in that the angle of inclination of the inclined table 0-5.
5. The method of claim 1, wherein said curing polyurethane compositions produced in 10-15 minutes.
print version
Publication date 21.01.2007gg
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