RU2622727C2 - Heat-insulating coating of underground pipeline for installation in highway conditions - Google Patents

Heat-insulating coating of underground pipeline for installation in highway conditions Download PDF

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Publication number
RU2622727C2
RU2622727C2 RU2015146414A RU2015146414A RU2622727C2 RU 2622727 C2 RU2622727 C2 RU 2622727C2 RU 2015146414 A RU2015146414 A RU 2015146414A RU 2015146414 A RU2015146414 A RU 2015146414A RU 2622727 C2 RU2622727 C2 RU 2622727C2
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RU
Russia
Prior art keywords
thermal insulation
pipeline
tapes
bandage
heat
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Application number
RU2015146414A
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Russian (ru)
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RU2015146414A (en
Inventor
Павел Александрович Ревель-Муроз
Павел Олегович Ревин
Инна Яковлевна Фридлянд
Original Assignee
Публичное акционерное общество "Транснефть" (ПАО "Транснефть")
Общество с ограниченной ответственностью "Научно-исследовательский институт транспорта нефти и нефтепродуктов Транснефть" (ООО "НИИ Транснефть")
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Application filed by Публичное акционерное общество "Транснефть" (ПАО "Транснефть"), Общество с ограниченной ответственностью "Научно-исследовательский институт транспорта нефти и нефтепродуктов Транснефть" (ООО "НИИ Транснефть") filed Critical Публичное акционерное общество "Транснефть" (ПАО "Транснефть")
Priority to RU2015146414A priority Critical patent/RU2622727C2/en
Publication of RU2015146414A publication Critical patent/RU2015146414A/en
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Publication of RU2622727C2 publication Critical patent/RU2622727C2/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00Thermal insulation in general
    • F16L59/14Arrangements for the insulation of pipes or pipe systems
    • F16L59/15Arrangements for the insulation of pipes or pipe systems for underground pipes

Abstract

FIELD: construction.
SUBSTANCE: heat-insulating pipeline coating includes at least one layer of heat insulation made from tightly united styrofoam segments fixed on the pipeline surface using steel galvanized bandage tapes so that at least two bandage tapes are arranged on each segment. A bitumen-polymer tape is applied on top of the styrofoam segments. On top of the bitumen-polymer tape a protective shell from rock shields is arranged, which are fixed on the pipeline surface using bandage tapes so that at least two bandage tapes are installed on each rock shield.
EFFECT: increasing the durability and lifetime of the pipeline.
7 cl, 1 dwg

Description

FIELD OF THE INVENTION
The invention relates to the field of construction and overhaul of pipelines, and in particular to methods of installing thermal insulation of an underground oil pipeline in route conditions.
State of the art
A known element of the thermal insulation of the pipeline, which is a fragment of the shell made of an extruded sheet or plate of foamed polymeric material and having longitudinal slots extending from the surface facing the pipeline, and partially dividing the element into sectors. The walls of the slots have a shape that ensures the formation of longitudinal channels when the element is applied to the pipeline (patent RU 73052 U1, publication date 05/10/2008).
The disadvantage of the insulation element is that the shells of the insulating material have slots, leading to a weakening of the mechanical strength of the structure in the zones of the slots and the possible destruction of the structure during several installation-dismantling cycles. In addition, in the proposed design of the thermal insulation element there is no outer shell protecting the thermal insulation material from mechanical stress, precipitation and groundwater. In addition, the proposed design cannot be used for thermal insulation of shaped products, such as bends, tees.
A known method for the implementation of collapsible thermal insulation for underground and above-ground channelless pipe laying, in which the annular space between the protective sheath and the insulated pipe is filled with removable shells having two layers: the inner one is heat-extinguishing and the outer one provides mechanical strength and additional heat and moisture protection, the shells are fastened with bandages, and the integument is freely pushed onto the shells (application RU 2000106633 A, publication date 10.04.2002).
The disadvantage of this method is the complexity of the assembly associated with the installation of the integument shell and the low efficiency of thermal protection due to susceptibility to damage to the insulating layers due to the presence of gaps and constructive shells that do not provide effective thermal protection of the joints.
A known method for the implementation of collapsible heat-insulating coating of the pipeline, including the installation of composite shells as a coating along the length of the pipeline, fastening them with bandages and protecting connecting joints. As composite shells, a monolithic modular element with two heat-insulating layers and a protective cover is used, the inner layer of which facing the pipeline is made of rigid polyisocyanurate foam having a softening temperature of 170 ° C, and the outer layer is made of molded polyurethane foam when the layers are mutually displaced relative to each other providing the presence of elements of thermal locking joints of the protrusion-cavity type over the entire contour of the modular element. The installation of the shells is carried out by stitching them around the perimeter and in length using transverse and longitudinal thermal locking joints and with a shift of the transverse seams by half the length of the shell, and the seams are sealed (patent RU 2343340 C1, publication date 01/10/2009).
The disadvantage of this method is that the galvanized shell of two shells, when connected, is installed end-to-end without overlapping, while the junction does not have a seal, which creates conditions for moisture to penetrate, which has a negative effect on the insulation elements, which leads to a reduction in its service life. In addition, the shells are not mechanically interconnected, which reduces the structural strength of the installed heat-insulating layer. The outer shell structure of galvanized sheet does not provide protection against underground corrosion.
A known method of mounting thermal insulation of technological pipelines, including the installation of composite shells as a coating on pipes and fittings, fastening them with bandages and protecting the joint seams. As the thermal insulation of pipes and parts of technological pipelines, foamed rubber is used in the form of tubes or rolls, which are installed in several layers, depending on the required thickness of the thermal insulation. At the same time, segments or sections are used for thermal insulation of the connecting parts, the insulation joints are glued with glue, and a galvanized steel casing is used as a protective sheath, which is fixed using self-tapping screws (patent RU 2530985 C1, publication date 10.10.2003).
The disadvantage of this method is that it is not intended for thermal insulation of the underground pipeline, since the protective shell made of galvanized sheet does not provide protection against underground corrosion. In addition, the use of rubber as thermal insulation does not provide the necessary structural rigidity, since soft rubber is easily crumpled by mechanical stress, which reduces the durability of the thermal insulation coating.
SUMMARY OF THE INVENTION
The problem to which the invention is directed, is to create a thermal insulation coating for an underground pipeline for installation in route conditions with enhanced performance characteristics.
The technical result achieved by the implementation of the claimed invention is to increase the durability and life of the pipeline by ensuring the structural strength of the heat-insulating coating and tightness, which prevents the ingress of moisture under the insulation.
The claimed technical result is achieved due to the fact that the heat-insulating coating of the underground pipeline for installation in route conditions includes at least one layer of thermal insulation made of sealed segments of polystyrene foam, fixed on the surface of the pipeline with steel galvanized bandages so that on each segment at least two banding tapes are placed, a bitumen-polymer tape with a width of not more than 450 mm and a thickness of not less than 0.6 mm, applied over the foam segments olistrirol with an overlap of adjacent coils with a width of at least 30 mm and a protective shell made of rock sheets located on top of the bitumen-polymer tape, which are fixed on the surface of the pipeline using bandage bands so that at least two bandage bands are installed on each rock sheet .
In addition, in the particular case of the invention, the segments of the second insulation layer are installed with overlapping seams of the previous layer with a distance between the joints of at least 50 mm.
In addition, in the particular case of the invention, the steel galvanized bandage tape has a thickness of at least 0.7 mm and a width of 12-20 mm.
In addition, in the particular case of the invention, the distance between the steel galvanized bandage tapes is not more than 500 mm
In addition, in the particular case of the invention, the rock sheet has a thickness of at least 3 mm.
In addition, in the particular case of the invention, polyester tapes with a width of at least 19 mm are used as bandage tapes for fixing rock sheets.
In addition, in the particular case of the invention, the distance between the bandage polyester tapes is not more than 500 mm
Information confirming the implementation of the invention
FIG. 1 is a general view of the thermal insulation coating of an underground pipeline based on polystyrene foam segments.
The thermal insulation coating of the underground pipeline (Fig. 1) includes polystyrene segments 1, the dimensions of which (width, thickness and length) depend on the specific characteristics of the pipes and connecting parts of the process pipelines. Segments 1 of expanded polystyrene have grooves around the entire perimeter for connection with each other. If the calculated thickness of the heat-insulating coating exceeds the thickness provided by the nomenclature of segments 1, then the coating is performed in the form of two or three layers of sequentially installed segments 1. Installation of the second layer 2 of the coating is performed with overlapping joints 3 of the previous layer with a distance l between joints of at least 50 mm. During installation, all seams 3 between segments 1 of the insulation are sealed with sealant 4, which provides the possibility of work at temperatures up to minus 30 ° C. The segments 1 mounted on the surface of the pipe 5 are fastened with galvanized steel banding tapes 6, which ensures reliable fixation of the coating of segments 1 on the pipe surface. In a preferred embodiment of the invention, the galvanized steel banding tape 6 should have a thickness of at least 0.7 mm to ensure its mechanical strength and a width of 12-20 mm. When the thickness of the retaining tape 6 is less than 0.7 mm, there is a possibility of its rupture, which can lead to a violation of the fixation of segments 1 on the surface of the pipe 5. The distance L between the retaining tapes 6 should be no more than 500 mm, with each segment 1 forming an thermal insulation layer, must be installed at least two retaining bands 6 to increase the reliability of fixing segments 1 on the surface of the pipe 5, because in the event of a rupture of one of the retaining bands 6, the second will continue to carry out its retention functions. A bitumen-polymer tape 7 with a width of not more than 450 mm and a thickness of 0.6 mm was applied over the layer of polystyrene foam segments 1, designed to provide mechanical screed for the coating of segments 1 and to prevent moisture from entering under thermal insulation. The minimum thickness of the tape 7 is selected based on its mechanical strength, i.e. exclusion of a gap during winding, and the minimum width is selected on the basis of ensuring a minimum number of overlaps of adjacent turns of the tape during winding and the convenience of winding the tape during installation. A preferred overlap of adjacent turns of tape 7 is at least 30 mm. On top of the bitumen-polymer tape 7, a protective sheath 8 is made of rock sheet, preferably at least 3 mm thick, which protects the pipeline from dynamic (shock) impacts, as well as from abrasive effects on the thermal insulation of the pipeline with solid inclusions of soil. Applying a protective sheath over the bitumen-polymer tape 7 also provides reliable adhesion of the sheath 8 to the polystyrene segments 1. Rock sheet 8 is fixed on the surface of the pipeline using bandage polyester bands 9 with a width of at least 19 mm. The distance L 1 between the retaining bands 9 should be no more than 500 mm, while at least two retaining bands 9 should be installed on each rock sheet 9, which increases the reliability of fixing the rock sheets 9 on the surface of the pipeline, because in the event of a rupture of one of the retaining bands 9, the second will continue to carry out its retention functions.
Thus, the implementation of the invention improves the durability of the pipeline and its life.

Claims (7)

1. Thermal insulation coating of an underground pipeline for installation in route conditions, comprising at least one layer of thermal insulation made of hermetically connected segments of expanded polystyrene, fixed on the surface of the pipeline using steel galvanized bandage tapes in such a way that at least two bandage tapes are placed on each segment , bitumen-polymer tape with a width of not more than 450 mm and a thickness of not less than 0.6 mm, deposited on top of polystyrene foam segments with an overlap of adjacent coils with a width of at least 30 m And a protective cover made of sheet rock overlying bitumen-polymer tape, which are fixed on the pipeline surface via binding bands so that each sheet rock set of at least two binding bands.
2. Thermal insulation coating according to claim 1, characterized in that the segments of the second thermal insulation layer are installed with overlapping seams of the previous layer with a distance between the seams of at least 50 mm.
3. The heat-insulating coating according to claim 1, characterized in that the steel galvanized bandage tape has a thickness of at least 0.7 mm and a width of 12-20 mm.
4. Thermal insulation coating according to claim 1, characterized in that the distance between the steel galvanized bandage tapes is not more than 500 mm.
5. The heat-insulating coating according to claim 1, characterized in that the rock sheet has a thickness of at least 3 mm.
6. The heat-insulating coating according to claim 1, characterized in that polyester tapes with a width of at least 19 mm are used as retaining tapes for fixing the rock sheets.
7. Thermal insulation coating according to claim 6, characterized in that the distance between the bandage polyester tapes is not more than 500 mm.
RU2015146414A 2015-10-28 2015-10-28 Heat-insulating coating of underground pipeline for installation in highway conditions RU2622727C2 (en)

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RU2622727C2 true RU2622727C2 (en) 2017-06-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2703897C1 (en) * 2018-10-31 2019-10-22 Публичное акционерное общество "Газпром" Pipeline heat insulation method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU40433U1 (en) * 2004-06-15 2004-09-10 Общество с ограниченной ответственностью "ПЕНОПЛЭКС-СПб" Thermal insulation construction
RU69961U1 (en) * 2007-08-07 2008-01-10 Антон Сергеевич Кашин Rock pipe protection
RU2343340C1 (en) * 2007-06-04 2009-01-10 Общество с ограниченной ответственностью "Группа компаний Сибирский ориентир" Method of arrangement of mountable-dismountable heat insulating pipeline coating
RU2430127C2 (en) * 2009-04-02 2011-09-27 Газимагомед Абулович Богамедов Rolled self-adhesive bitumen-containing material and method of its production

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU40433U1 (en) * 2004-06-15 2004-09-10 Общество с ограниченной ответственностью "ПЕНОПЛЭКС-СПб" Thermal insulation construction
RU2343340C1 (en) * 2007-06-04 2009-01-10 Общество с ограниченной ответственностью "Группа компаний Сибирский ориентир" Method of arrangement of mountable-dismountable heat insulating pipeline coating
RU69961U1 (en) * 2007-08-07 2008-01-10 Антон Сергеевич Кашин Rock pipe protection
RU2430127C2 (en) * 2009-04-02 2011-09-27 Газимагомед Абулович Богамедов Rolled self-adhesive bitumen-containing material and method of its production

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Теплоизоляционные изделия ЗАО ";ИЗОРОК"; в конструкциях тепловой изоляции оборудования и трубопроводов. Рекомендации по применению с альбомом технических решений. М.: ЗАО ";ИЗОРОК";, 2009, с.33-36, 65-69. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2703897C1 (en) * 2018-10-31 2019-10-22 Публичное акционерное общество "Газпром" Pipeline heat insulation method

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