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SU1006852A1 - Method of protecting outer surfaces of pipes and shells by polymers - Google Patents

Method of protecting outer surfaces of pipes and shells by polymers Download PDF

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Publication number
SU1006852A1
SU1006852A1 SU792813105A SU2813105A SU1006852A1 SU 1006852 A1 SU1006852 A1 SU 1006852A1 SU 792813105 A SU792813105 A SU 792813105A SU 2813105 A SU2813105 A SU 2813105A SU 1006852 A1 SU1006852 A1 SU 1006852A1
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USSR - Soviet Union
Prior art keywords
strip
pipe
gap
edges
pipes
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Application number
SU792813105A
Other languages
Russian (ru)
Inventor
Сергей Иванович Сухов
Михаил Николаевич Фокин
Владимир Павлович Кабаев
Александр Сергеевич Сухов
Original Assignee
Всесоюзный Научно-Исследовательский Институт По Защите Металлов От Коррозии
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Priority to SU792813105A priority Critical patent/SU1006852A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114Single butt joints
    • B29C66/1142Single butt to butt joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B29C63/04Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
    • B29C63/08Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically
    • B29C63/10Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically around tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/40Applying molten plastics, e.g. hot melt
    • B29C65/42Applying molten plastics, e.g. hot melt between pre-assembled parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/432Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/432Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4329Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms the joint lines being transversal but non-orthogonal with respect to the axis of said tubular articles, i.e. being oblique
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • B29C66/4722Fixing strips to surfaces other than edge faces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/49Internally supporting the, e.g. tubular, article during joining
    • B29C66/496Internally supporting the, e.g. tubular, article during joining using a support which remains in the joined object
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56Winding and joining, e.g. winding spirally
    • B29C53/58Winding and joining, e.g. winding spirally helically
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/40Applying molten plastics, e.g. hot melt
    • B29C65/42Applying molten plastics, e.g. hot melt between pre-assembled parts
    • B29C65/425Applying molten plastics, e.g. hot melt between pre-assembled parts characterised by the composition of the molten plastics applied between pre-assembled parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00Tubular articles
    • B29L2023/22Tubes or pipes, i.e. rigid

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

СПОСОБ ЗАЩИТЫ НАРУЖНОЙ ПОВЕРХНОСТИ ТРУБ И ОБОЛОЧЕК ПОЛИМЕРАМИ , включающий спиральную навивку на поверхность трубы полосы из термопластичных полимеров с последующей сваркой кромок ее смежных витков, отличающийс  тем, что, с целью повышени  качества и эксплуатационной стойкости покрыти , навивку полосы производ т с зазором между витками, а сварку кромок осуществл ютподачей в зазор расплава, однородного с полосой состава. S РРЙШ - ---- f гMETHOD OF PROTECTION OF THE EXTERNAL SURFACE OF PIPES AND SHELLS BY POLYMERS, including a spiral winding on the pipe surface of a strip of thermoplastic polymers with subsequent welding of the edges of its adjacent turns, characterized in that, in order to improve the quality and operational durability of the coating, the strip winding is produced with a gap between the sleeves between the turns of the coils, and between the sleeves between the coils, and the edges are welded into the melt gap, which is homogeneous with the strip composition. S RRISH - ---- f g

Description

Изобретение относитс  к способам получени  защитных полимерных покрытий на наружной поверхности труб и оболочек, изготавливаемых из углеродистых сталей, стекла, стеклопластиков и других материалов . Известен способ защиты наружной поверхности труб полосами из термопластичных полимеров, включающий навивку полосы по спирали внахлест с одновременной отбортовкой одной ее кромки наружу волокнистым материалом и с последующим перекрытием этой кромки неотбортованной кромкой соседнего витка, при этом полоса скрепл етс  с поверхностью трубы в местах нахлеста витков кле щим полимером 1. Недостатками данного способа  вл ютс : отслоение и растрескивание покрыти  из-за наличи  воздущных включений и циклического изменени  их объема, а также остаточных напр жений по месту нахлеста кромок; отслоение и разрущение клеевого соединени  из-за более низкой коррозионной стойкости кле щего полимера и наличи  свободных пор, через которые происходит проникновение агрессивной среды. Известен также способ защиты наружной поверхности труб и оболочек полиме . рами, включающий спиральную навивку на поверхность трубы полосы из термопластичных полимеров с последующей сваркой кромок ее смежных витков 2. Этот способ имеет следующие недостатки: защитное покрытие способа имеет высокие остаточные напр жени , особенно в местах нахлеста витков и склонно к растрескиванию; осложнение процесса защиты трубы операци ми по электростатическому напылению и оплавлению тер юпластичного порощка; сложное аппаратурное оформлекие процесса по защите труб. Цель изобретени  - повыщение качества и эксплуатационной стойкости покрыти . Цель достигаетс  тем, что согласно способу защиты наружной поверхности труб и оболочек полимерами, включающему спиральную навивку на поверхность трубы полосы из термопластичных полимеров с последующей сва.ркой кромок ее смежных витков , навивку полосы производ т с зазором между витками, а сварку кро.мок осуществл ют подачей в зазор расплава, однородного с полосой состава. Дл  покрыти  могут примен тьс  полосы из любых термопластичных полимеров пригодных дл  качественной сварки, в том числе из: полиэтилена низкой, средней и высокой плотности, полипропилена, поливинилхлорида , АВС-пластиков, плавких фторлонов и других, а также сополимеров термопластов . Предложенный способ имеет два исполнени . При первом исполнении способа используют термопластичные полосы с адгезионноактивной поверхностью, например в виде наплавленного волокнистого материала из синтетических или стекл нных волокон, а при втором исполнении способа - обычные гладкие полосы. Толщина полос может быть различной в пределах 1-6 мм, а щирина 0,1-0,3 диаметра защищаемой трубы. Технологический процесс защиты может быть непрерывным при вращательном и поступательном движении трубы и периодическим при вращательном движении трубы и поступательном движении устройства дл  подачи полосы. На фиг. 1 изображена принципиальна  схема реализации предложенного способа; на фиг. 2 - труба с двум  участками - до сварки и после сварки витков; на фиг. 3 - участок трубы, сваренный по первому исполнению; на фиг. 4 - участок трубы, сваренный по второму исполнению. Первое исполнение способа (фиг. 1). Перед нанесением защитного покрыти  труба 1 подвергаетс  очистке от загр знений и дробеструйной обработке. На подготовленную поверхность трубы 1 и полосу 2 нанос т слой термореактйвного кле  3, либо клей 3 нанос т только на трубу 1 или только на полосу 2. Трубе 1 сообщаетс  вращательное или вращательно-поступательное движение, 2 подаетс  к трубе 1 горизонтально „а уровне нижней образующей или под , горизонту не более 15° при нат жении1--10 кгс/см и навиваетс  на трубу 1 по спирали с зазором 4 между кромками витков 5 в пределах 0,2-4,0 мм, а в зазор 4 подаетс  расплав б однородного с полосой состава. При подаче в зазор избытка расплава 6 образуютс  упрочн ющие ребра 7 жесткости заданного сечени . Температура расплава 6 назначаетс  из условий полного оплавлени  кромок витков 5, например дл  полиэтилена низкой плотности 240-300°С. Прочность креплени  полосы 2 к трубе 1 зависит от многих факторов, но должна находитьс  в пределах 40-120 кгс/см. Второе исполнение способа (фиг. 1). Перед нанесением покрыти  трубу 1 очищают от загр знени , подвергают дробеструйной обработке и нагревают в зависимости от вида термопластовой полосы 2, например, из полиэтилена низкой плотности до 280- 320°С. Допустимо нагревать трубу 1 непосредственно в процессе навивки на нее полосы 2. Трубе 1 сообщаетс  вращательное или вращательно-поступательное движение и на нее нанос т слой термопластичного порощка 8 или термопластичного кле  9 однородных с полосой составов. Возвожно слой порошка 8 или кле  9 наносить непосредственно на полосу 2 перед ее навивкой на трубу 1. Толщина сло  порошка 8 должна быть в пределах 0,6-2,0 мм при плотности 0,4- 0,8 а термопластичного кле  9 - 0,4-0,8 мм. Полоса 2 без сло  порошка 8 или кле  9 или с ними подаетс  к трубе 1 горизонтально на уровне нижней образующей, или под углом не более 15° с нат жением 1 5 кгс/см навиваетс  на трубу 1 с равномерным прижимом 1 -10 кгс/см по спирали с зазором 4 между кромками витков 5 в пределах 0,2-4,0 мм, а в зазор подаетс  расплав 6 однородного с полосой состава. При подаче в зазор 4 избытка расплава 6 образуютс  упрочн ющие ребра жесткости 7 заданного сечени . Сформованное на трубе покрытие по мере готовности принудительно охлаждаетс . Прочность креплени  полосы 2 к трубе 1 зависит от многих факторов, но должна быть в пределах 60-120 кгс/см. В результатет каждого исполнени  способа на поверхности трубы 1 получают сплощное и монолитное покрытие с высокой прочностью св зи, минимальными воздушными включени ми и низкими остаточными напр жени ми, что обеспечивает более высокое качество покрыти  и высокую эксплуатационную стойкость. На фиг. 2 приведен внещний вид трубы 1 с участками готового покрыти  10 и участком намотанных витков 11 с зазором 4 между кромками. На фиг. S показана в разрезе часть трубы 1, защищенной по первому исполнению способа полосой 2 с наплавленным на нее волокнистым материалом 12, зазором 4 между кромками витков 5, заполненным расплавом 6 однородного с полосой составом , и ребром жесткости 7 и клеем 3. На фиг. 4 показана в разрезе часть трубы 1, защищенной по второму исполнению способа гладкой полосы2 зазором 4 между кромками витков 5, заполненным расплавом 6 однородного с полосой состава и ребром жесткости 7 и клеем 8 или 9. Пример 1. На очищенную и дробеструйно обработанную поверхность трубы диаметром 1000 мм из углеродистой стали Ст.З и полосу из полиэтилена низкой плотности толщиной 2 мм, щириной 400 мм с наплавленным волокнистым материалом из синтетических волокон нанос т клей 88 Н. Трубе сообщаетс  вращательное движение. Полоса подаетс  к трубе горизонтально и навиваетс  по спирали с зазором между кромками витков I мм с нат жением 3 кгс/см. В зазор между кромками витков подаетс  расплав однородного с полосой состава нагретого до 2бО°С дл  ПО/1НОГО заполнени  зазора и образовани  ребра жесткости щириной 6 и высотой 3 мм. Прочность креплени  полосы к трубе составл ет 40 кгс/см. Пример 2. По примеру 1 защищаетс  труба из технического стекла диаметром 100 мм той же полосой шириной 50 мм с полным заполнением зазора расплавом без образовани  ребер жесткости. Пример 3. По примеру 1 защищаетс  труба из стеклопластика диаметром 800 мм полосой шириной 300 мм. Пример 4. Трубы по примерам 1-3 защищаютс  полосой из полипропилена с наплавленным волокнистым материалом из стеклотрикотажа. На трубу и полосу нанос т клей на основе полиэфирной ПН-1 или эпоксидной ЭД-20 смолы. Прочность креплени  полосы к трубам 120 кгс/см. Пример 5. По примеру 1 клей 88Н нанос т только на трубу или только на полосу. Пример 6. На очищенную и дробеструйно обработанную трубу из стали Ст. 3 диаметром 600 мм нагретую до 300°С нанос т слой порошка из полиэтилена низкой плотности плотностью 0,6 г/см, толщина 1 мм в виде непрерывной спиральной полоски щириной 220 мм. Полоса из того же полиэтилена толщиной 2 мм, щириной 200 мм подаетс  к трубе горизонтально с нат жением 2 кгс/см, навиваетс  на трубу по спирали с равномерным прижимом 3 и зазором между кромками витков 1,5 мм. В зазор подаетс  расплав однородного с полосой состава с избытком дл  образовани  ребра жесткости щириной 8 мм, высотой 3 мм. Сваренные витки охлаждаютс  обдувкой воздухом. Прочность креплени  полосы к трубе 100 кгс/см. Пример 7. По примеру 6 защищаетс  труба при нанесении порошка непосредственно на полосу перед ее навивкой на трубу. Порошок предварительно на трубу не наноситс . Пример 8. По примеру 6 или 7 защищаетс  труба полосой из полипропилена, Пример 9.. По примеру 6 или 7 защищаетс  труба полосой из полиэтилена низкой плотности модифицированного поливинилацетатом (до 6%). Прочность креплени  полосы к трубе 60 кгc/cм. Пример 10. По призеру 6 или 7 вместо порошка на трубу или полосу нанос т слой термопластичного кле  в виде расплава. Прочность креплени  полосы к трубе 60 кгс/см. Предлагаемый способ обладает повышенным качеством и эксплуатационной стойкостью покрыти , возможностью защиты труб и оболочек в заводских и монтажных услови х, возможность применени  готовых полос из различных полимеров с адгезионноактивной поверхностью и неактивизированных , снижение энергетических затрат.The invention relates to methods for producing protective polymeric coatings on the outer surface of pipes and shells made of carbon steel, glass, fiberglass and other materials. A known method of protecting the outer surface of pipes with strips of thermoplastic polymers includes winding the strip in a spiral with simultaneous folding of one edge outwards with a fibrous material and then overlapping this edge with an unbordered edge of the next turn, and the strip is attached to the surface of the pipe at the points of overlap of the turns of adhesive. polymer 1. The disadvantages of this method are: peeling and cracking of the coating due to the presence of air inclusions and the cyclic change in their volume, and that also residual stresses at the place of overlap of edges; the detachment and destruction of the adhesive compound due to the lower corrosion resistance of the adhesive polymer and the presence of free pores through which the penetration of the corrosive medium occurs. There is also known a method of protecting the outer surface of pipes and shells of polyme. a frame comprising a spiral winding onto the surface of a pipe of a strip of thermoplastic polymers with subsequent welding of the edges of its adjacent turns 2. This method has the following disadvantages: the protective coating of the method has high residual stresses, especially in places of overlap of turns and is prone to cracking; complicating the process of protecting the pipe with electrostatic spraying and melting of a thermoplastic core; complex instrumentation process for the protection of pipes. The purpose of the invention is to increase the quality and operational durability of the coating. The goal is achieved by the method of protecting the outer surface of pipes and shells with polymers, including spiral winding a strip of thermoplastic polymers onto the surface of a pipe, followed by welding the edges of its adjacent turns, winding the strip with a gap between the turns, and welding By feeding a melt into the gap, it is uniform with a strip of composition. Strips of any thermoplastic polymers suitable for high-quality welding can be used for the coating, including: low, medium and high density polyethylene, polypropylene, polyvinyl chloride, ABC plastics, fusible fluoronols and others, as well as copolymers of thermoplastics. The proposed method has two versions. In the first implementation of the method, thermoplastic strips with an adhesive-active surface are used, for example, in the form of a deposited fibrous material made of synthetic or glass fibers, and in the second embodiment of the method, normal smooth strips. The thickness of the strips can be different in the range of 1-6 mm, and the width of 0.1-0.3 diameter of the pipe to be protected. The technological process of protection may be continuous with the rotational and translational movement of the pipe and periodic with the rotational movement of the pipe and the translational movement of the device for feeding the strip. FIG. 1 shows a schematic diagram of the implementation of the proposed method; in fig. 2 - a pipe with two sections - before welding and after welding of turns; in fig. 3 - pipe section welded in accordance with the first design; in fig. 4 - pipe section welded according to the second design. The first implementation of the method (Fig. 1). Before applying the protective coating, the pipe 1 is cleaned and shot-blasted. A layer of thermosetting glue 3 is applied to the prepared surface of pipe 1 and strip 2, or glue 3 is applied only to pipe 1 or only to strip 2. Pipe 1 is rotated or rotated, 2 is fed horizontally to pipe 1 and the bottom level generatrix or under, the horizon is not more than 15 ° when tension is 1--10 kgf / cm and is wound on pipe 1 in a spiral with a gap 4 between the edges of the coils 5 within 0.2-4.0 mm, and melt 6 is fed into the gap 4 uniform with a strip of composition. When an excess of the melt 6 is fed into the gap, reinforcing ribs 7 of rigidity of a given cross section are formed. The temperature of the melt 6 is assigned from the conditions of complete melting of the edges of the coils 5, for example, for low-density polyethylene 240-300 ° C. The strength of fastening of the strip 2 to the pipe 1 depends on many factors, but must be in the range of 40-120 kgf / cm. The second execution of the method (Fig. 1). Before coating, the pipe 1 is cleaned of contamination, subjected to shot-blasting and heated depending on the type of thermoplastic strip 2, for example, from low-density polyethylene to 280-320 ° C. It is permissible to heat the tube 1 directly in the process of winding the strip 2 onto it. The tube 1 is connected with a rotational or rotational-translational motion and a layer of thermoplastic powder 8 or thermoplastic glue 9 homogeneous with a strip of compositions is applied to it. It is possible to apply a layer of powder 8 or glue 9 directly onto strip 2 before winding it onto pipe 1. The thickness of the layer of powder 8 should be in the range of 0.6-2.0 mm at a density of 0.4-0.8 and thermoplastic glue 9-0. 4-0.8 mm. Band 2 without a layer of powder 8 or glue 9 or with them is fed to the pipe 1 horizontally at the level of the lower generatrix, or at an angle of no more than 15 ° with a tension of 1.5 kgf / cm wound onto the pipe 1 with a uniform clamp 1-10 kgf / cm in a spiral with a gap 4 between the edges of the coils 5 in the range of 0.2-4.0 mm, and a melt 6 of uniform composition with a strip is fed into the gap. When an excess of the melt 6 is fed into the gap 4, reinforcing stiffening ribs 7 of a given cross section are formed. The coating formed on the pipe is forcibly cooled as it is ready. The strength of fastening of the strip 2 to the pipe 1 depends on many factors, but must be in the range of 60-120 kgf / cm. As a result of each execution of the method, a flat and monolithic coating with high bond strength, minimal air inclusions and low residual stresses is obtained on the surface of pipe 1, which ensures higher coating quality and high operational durability. FIG. Figure 2 shows an external view of pipe 1 with sections of the finished coating 10 and a section of wound coils 11 with a gap 4 between the edges. FIG. S is shown in section of a portion of pipe 1 protected by the first implementation of the method by strip 2 with fiber material 12 deposited on it, gap 4 between the edges of turns 5, filled with melt 6 of uniform composition with strip, and stiffener 7 and glue 3. FIG. 4 shows a section of a pipe 1 protected by the second embodiment of the method of a smooth strip 2 with a gap 4 between the edges of the coils 5 filled with a melt 6 of uniform composition with a strip and a stiffener 7 and glue 8 or 9. Example 1 1000 mm of carbon steel St.Z and a strip of low-density polyethylene 2 mm thick, 400 mm wide with glue 88 N applied to the weld-over fibrous material of synthetic fibers applied to the pipe. Rotational motion is connected to the pipe. The strip is fed horizontally to the pipe and is wound in a spiral with a gap between the edges of the I mm coils with a tension of 3 kgf / cm. In the gap between the edges of the coils, a homogeneous melt with a strip of composition heated to 2 ° C is fed to ON / 1TH the filling of the gap and the formation of a stiffening rib with a width of 6 and a height of 3 mm. The strength of fastening the strip to the pipe is 40 kgf / cm. Example 2. In Example 1, a pipe of technical glass 100 mm in diameter is protected by the same strip 50 mm wide with the gap completely filled with melt without forming stiffeners. Example 3. In Example 1, a fiberglass pipe with a diameter of 800 mm and a width of 300 mm is protected. Example 4. The tubes of Examples 1-3 are protected by a strip of polypropylene with a fused fiberglass material. An adhesive based on polyester PN-1 or epoxy ED-20 resin is applied to the pipe and strip. The strength of fastening the strip to pipes is 120 kgf / cm. Example 5. In Example 1, 88N glue is applied only to the pipe or only to the strip. Example 6. A cleaned and shot-blasted steel pipe Art. 3 with a diameter of 600 mm and heated to 300 ° C, a layer of a powder of low density polyethylene with a density of 0.6 g / cm and a thickness of 1 mm is applied in the form of a continuous spiral strip with a width of 220 mm. A strip of the same polyethylene with a thickness of 2 mm, with a width of 200 mm, is applied horizontally to the pipe with a tension of 2 kgf / cm, spiral wound onto the pipe with a uniform pressure 3 and a gap between the edges of the turns of 1.5 mm. A melt of a uniform composition with an excess band is supplied to the gap to form a stiffener with a width of 8 mm and a height of 3 mm. The welded coils are cooled by air blasting. The strength of fastening the strip to the pipe is 100 kgf / cm. Example 7. In Example 6, a pipe is protected when the powder is applied directly to the strip before winding it onto the pipe. The powder is not applied to the pipe beforehand. Example 8. In Example 6 or 7, a pipe is protected by a strip of polypropylene, Example 9. In Example 6 or 7, a pipe is protected by a strip of low density polyethylene modified with polyvinyl acetate (up to 6%). The strength of fastening of a strip to a pipe is 60 kgc / cm. Example 10. According to prize winner 6 or 7, a layer of thermoplastic glue is applied in the form of a melt instead of powder to a pipe or strip. The strength of fastening the strip to the pipe is 60 kgf / cm. The proposed method has improved quality and operational durability of the coating, the ability to protect pipes and shells in the factory and installation conditions, the possibility of using ready-made strips of various polymers with an adhesive-active surface and non-activated, reducing energy costs.

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Claims (1)

СПОСОБ ЗАЩИТЫ НАРУЖНОЙ ПОВЕРХНОСТИ ТРУБ И ОБОЛОЧЕК ПОЛИМЕРАМИ, включающий спиральную навивку на поверхность трубы полосы из термопластичных полимеров с последующей сваркой кромок ее смежных витков, отличающийся тем, что, с целью повышения качества и эксплуатационной стойкости покрытия, навивку полосы производят с зазором между витками, а сварку кромок осуществляют подачей в зазор расплава, однородного с полосой состава.METHOD OF PROTECTING THE EXTERNAL SURFACE OF PIPES AND SHELLS BY POLYMERS, including spiral winding of a strip of thermoplastic polymers onto the pipe surface with subsequent welding of the edges of its adjacent turns, characterized in that, in order to improve the quality and operational stability of the coating, the strip is wound with a gap between the turns, welding of the edges is carried out by feeding a melt homogeneous with the composition strip into the gap. Фиг. 1FIG. 1
SU792813105A 1979-08-24 1979-08-24 Method of protecting outer surfaces of pipes and shells by polymers SU1006852A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314923A4 (en) * 2000-08-29 2005-03-23 Sekisui Chemical Co Ltd Composite high-pressure tube and method of manufacturing the tube
RU2424254C2 (en) * 2006-02-22 2011-07-20 Шоукор Лтд. Procedure of application of coating on pipe with bead weld

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
1. Патент DE № 2060781, кл. F 16 L 58/00, 1975. 2. Патент US № 3868265, кл. 117-18, 1975 (прототип). *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314923A4 (en) * 2000-08-29 2005-03-23 Sekisui Chemical Co Ltd Composite high-pressure tube and method of manufacturing the tube
RU2424254C2 (en) * 2006-02-22 2011-07-20 Шоукор Лтд. Procedure of application of coating on pipe with bead weld

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