RU144437U1 - HEAT-PROTECTED PIPE - Google Patents

Abstract

The invention relates to pipeline technology, in particular to prefabricated thermally-insulated pipes for laying heating networks in passageways, tunnels and above-ground heating mains. The technical result is to prevent flooding of long sections of pipelines, to ensure localization of the rupture site, and also to increase efficiency in providing thermal protection of the heating system by reducing the areas of wet insulation and inefficient replacement. To achieve a technical result, a thermally insulated pipe contains a pipe (1), covering its thermal insulation from pouring polyurethane foam (2) with centering supports (4) located in it, and a waterproof cover (3). According to a utility model, a thermally insulated pipe is additionally provided with at least two drainage holes (5) along with membrane plugs (6) along the length. Drainage holes (5) are made radially in thermal insulation (2) through a hydroprotective shell (3) to the pipe and are muffled with the possibility of water passing in one direction from the pipe to the outside. Moreover, in the layer of polyurethane insulation (2), the drainage holes (5) are filled with a sealed composition characterized by the ability to soak under the influence of moisture, and a waterproof membrane (6) is installed in the waterproof cover (3). 1 ill.

Description

The utility model relates to pipeline technology, in particular to prefabricated thermally-insulated pipes for laying heating networks in passageways, tunnels and for above-ground heating mains.

A pipeline is known that includes a metal pipe with a polyurethane foam heat-insulating coating of a casting type and an external integral waterproofing shell made of low-pressure polyethylene (RF Patent No. 229754 C2, priority date 10.11.2000, publication date 10.04.2005, author Anthony Costa, RU).

A disadvantage of the known analogue is the low efficiency of thermal protection of the pipeline due to the wetting of large sections of polyurethane foam insulation when metal pipes rupture due to the lack of a thermal insulation monitoring system and means of protecting it from flooding.

Known heat-insulated pipeline containing a pipe with a heat-insulating coating and with an external waterproof sheath, while the heat-insulating coating is divided by watertight partitions, forming lengthwise sealed compartments (Application RU 2007117867 A, priority date May 15, 2007, publication date of the application November 20, 2008, authors Kulikov Yu .A. And others.

A disadvantage of the known thermo-hydroinsulated pipeline is the complexity of the design, as well as the time-consuming technology due to the device in thermal insulation of waterproof partitions.

Known thermo-insulated pipe element for overhead installation of heating mains, adopted as a prototype, containing a steel pipe element covering its thermal insulation from pouring polyurethane foam, a waterproof spiral-sheath made of galvanized sheet steel, centering rings forming an annular gap filled with a remote system polyurethane foam, and copper monitoring the state of humidity of thermal insulation (Patent for a utility model of the Russian Federation No. 49166 U1, priority date 04/20/2005, publication date 1 November 0, 2005, authors Ignatov A.A. and Shirinyan V.T., KDL, prototype).

The disadvantage of the prototype is its low efficiency, due to an insufficiently effective system of remote monitoring of the humidity state of thermal insulation, which does not prevent the flooding of long sections of the heating main and localization of the rupture site, as well as low efficiency in providing thermal protection of the heating main due to wetting of large sections of insulation during the rupture of metal pipes and the lack of funds to prevent flooding.

The objective of the utility model is to prevent flooding of long sections of pipelines and localization of the rupture site, as well as to increase the efficiency in providing thermal protection of the heating main by reducing the areas of wet insulation.

To solve the problem, a thermally-insulated pipe, including a pipe covering its thermal insulation from pouring polyurethane foam with centering supports located in it and a waterproof cover, according to a utility model, it is additionally equipped with at least two drainage holes with membrane-type plugs, drainage the holes are made radially in thermal insulation through a waterproof cover to the pipe and are plugged with the possibility of water passing in one direction from the pipe to the outside, In the layer of polyurethane foam insulation, the drainage holes are filled with a densified composition characterized by the ability to get wet under the influence of moisture, and a waterproof membrane is installed in the waterproof membrane.

The drawing schematically shows a thermally insulated pipe, a longitudinal section.

The thermally-insulated pipe contains a steel or polyethylene pipe 1, rigid thermal insulation 2 made of polyurethane foam and a waterproof sheath 3, which can be used as a spiral-sheathed galvanized sheet steel sheath or a low-pressure polyethylene sheath. The pipe 2 has centering supports 4 made of low-pressure polyethylene or polypropylene, forming an annular annular space between the pipe 1 and the waterproof sheath 3, filled with pouring polyurethane foam, which forms thermal insulation 2. Copper wires of the remote monitoring system for the moisture state of thermal insulation can be located in a thermally insulated pipe ( conditionally not shown). In addition to or instead of this system, its thermally-insulated pipe is provided along the length with drainage holes 5, which are indicators of control. The drainage holes 5 are made radially in thermal insulation 2 through a hydro-protective sheath 3 to the pipe and are plugged with the possibility of water passage in one direction - from the pipe to the outside. Moreover, in the layer of polyurethane foam insulation 2, the drainage holes 5 are filled with a densified composition capable of getting wet under the action of moisture. As such a composition, for example, a glue-based composition can be used. A waterproof membrane 6 adjacent to the sealed composition is installed in the waterproofing shell 3, for example, a membrane fabric or coating located on the outside with a waterproof surface (http://palatok.ru/articles/chto_takoe_membrana_i_membrannie_tkani/, accessed 05.10.2013). Drainage holes 5 with plugs of the membrane type are designed to ensure water drainage when a pipe ruptures or welds, localizes the rupture and prevents flooding of the insulation. The implementation of the drainage holes 5 may be provided both in the production technology of thermally insulated pipes, and during their installation. Drainage holes with a pipe length of 8 to 12 m are expediently performed in two, three or four places. In this case, the extreme openings should be located near the butt ends of the pipes in order to possibly localize gusts in these most dangerous places.

The manufacture of thermo-insulated pipes is carried out according to the well-known “pipe-in-pipe” technology, in which the annular annular space between the pipe 1 and the hydroprotective sheath 3, formed with the help of polyethylene centering supports 4 installed on the pipe 1, is filled with pouring polyurethane foam, after which a rigid polyurethane foam is formed thermal insulation layer 2, covering the pipe 1. Next, in a thermally insulated pipe perform radially located drainage holes 5, drilled hydroprotective them through shell 3 and the thermal insulation layer 2 to the pipe 1, which then choke. At the same time, in the layer of polyurethane insulation 2, the drainage holes 5 are tightly filled with a glue-based waterproof composition, and a waterproof membrane 6 adjacent to the densified composition is installed in the waterproofing shell 3. The diameter of the drainage holes and their number are selected depending on the pipe size, diameter and wall thickness. Moreover, for pipe diameters up to 200 mm, it is advisable to use the ratio of dimeters d _dr / D _tr within not less than 1/20, and not more than 1/10, where d _dr is the diameter of the drainage holes, and D _tr is the diameter of the pipe, and with diameters pipes over 200 mm, the diameter of the drainage holes, it is advisable to perform at least wall thickness, increasing the number of holes in place from two to four.

During the operation of the pipeline, in the event of a rupture of pipes or welded joints, the plugs of the membrane type installed in the drainage holes are triggered, ensuring that water is drained from the pipe to the outside and prevents flooding of the insulation.

Thus, the presence of drainage holes in a thermally insulated pipe ensures the achievement of a technical result, which is to prevent flooding of long sections of pipelines, to ensure localization of the rupture, and also to increase efficiency in providing thermal protection of the heating main by reducing the wetting areas of the thermal insulation and ineffective replacement thereof.

Claims (1)

Heat-insulated pipe, including a pipe that covers its thermal insulation from pouring polyurethane foam with centering supports located in it and a waterproof cover, characterized in that it is additionally provided with at least two drainage holes along with membrane plugs, drainage holes are made radially in thermal insulation through a waterproof sheath to the pipe and plugged with the possibility of water passing in one direction from the pipe to the outside, and in the layer of polyurethane foam insulation and the drainage holes are filled with a compacted composition characterized by the ability to soak under the influence of moisture, and a waterproof membrane is installed in the waterproof membrane.