RU95102302A - Method of prevention of propagation of defects in pipe line walls - Google Patents

Method of prevention of propagation of defects in pipe line walls

Info

Publication number
RU95102302A
RU95102302A RU95102302/06A RU95102302A RU95102302A RU 95102302 A RU95102302 A RU 95102302A RU 95102302/06 A RU95102302/06 A RU 95102302/06A RU 95102302 A RU95102302 A RU 95102302A RU 95102302 A RU95102302 A RU 95102302A
Authority
RU
Russia
Prior art keywords
pressure
defects
pipe line
pipe
halves
Prior art date
Application number
RU95102302/06A
Other languages
Russian (ru)
Other versions
RU2097646C1 (en
Inventor
С.В. Головин
Н.Г. Гончаров
Е.В. Лопатин
А.Г. Мазель
И.А. Романова
В.И. Хоменко
Original Assignee
Товарищество с ограниченной ответственностью "ВНИИСТ-Сварка"
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Товарищество с ограниченной ответственностью "ВНИИСТ-Сварка" filed Critical Товарищество с ограниченной ответственностью "ВНИИСТ-Сварка"
Priority to RU95102302A priority Critical patent/RU2097646C1/en
Publication of RU95102302A publication Critical patent/RU95102302A/en
Application granted granted Critical
Publication of RU2097646C1 publication Critical patent/RU2097646C1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/16—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings the coating being in the form of a bandage

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

FIELD: operation of gas and petroleum product pipe lines. SUBSTANCE: if defects are revealed in pipe line walls, pressure is reduced in this pipe line to required value and steel sleeve consisting of two halves is fitted on pipe line without discontinuation of its operation, after which sleeve halves are welded together. This done, pressure is restored to working level; as a result, sleeve presses defective section of pipe line reducing circular tensile stresses which give rise to propagation of defects. Similar effect is obtained without reducing the pressure in pipe line at pressing thew sleeve halves on the outside before welding them by hydraulic chain clamp. To exclude defects in weld seams, ends of sleeves are welded to load-bearing pipe by means of circumferential fillet seams. Sleeves may be also made in form of sheet structures wound on pipe at reduced pressure. EFFECT: enhanced reliability.

Claims (1)

Использование: эксплуатация газонефтепродуктопроводов и водоводов высокого давления. Сущность изобретения: с целью предотвращения развития дефектов, обнаруженных в стенке трубопровода, в нем снижают давление на заданную величину и, не прекращая работы трубопровода, на дефектный участок надевают стальную муфту определенной толщины из двух половин, которые свариваются между собой. Затем давление восстанавливают до рабочего, при этом муфта обжимает дефектный участок трубопровода и снижает до расчетного уровня кольцевые растягивающие напряжения, ответственные за развитие дефектов. Аналогичный эффект достигается без снижения давления в трубопроводе при обжатии снаружи половин муфты до их сварки гидравлическими цепными зажимами. Для предупреждения раскрытия дефектов сварных швов торцы муфт привариваются к несущей трубе фланговыми кольцевыми швами. Муфты, разгружающие трубу, могут изготовляться также в виде многослойных листовых конструкций, наматываемых на трубу при пониженном давлении.Usage: operation of gas and oil pipelines and high pressure pipelines. The essence of the invention: in order to prevent the development of defects found in the wall of the pipeline, it reduces the pressure by a predetermined amount and, without stopping the operation of the pipeline, put on the defective section a steel sleeve of a certain thickness of two halves that are welded together. Then the pressure is restored to working, while the sleeve compresses the defective section of the pipeline and reduces the ring tensile stress responsible for the development of defects to the calculated level. A similar effect is achieved without reducing the pressure in the pipeline when the halves of the coupling are compressed from the outside before welding with hydraulic chain clamps. To prevent the disclosure of defects in welds, the ends of the couplings are welded to the supporting pipe by flanged ring seams. The pipe unloading couplings can also be made in the form of multilayer sheet structures wound around the pipe under reduced pressure.
RU95102302A 1995-02-17 1995-02-17 Method of prevention of development of flaws in pipe line walls RU2097646C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU95102302A RU2097646C1 (en) 1995-02-17 1995-02-17 Method of prevention of development of flaws in pipe line walls

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU95102302A RU2097646C1 (en) 1995-02-17 1995-02-17 Method of prevention of development of flaws in pipe line walls

Publications (2)

Publication Number Publication Date
RU95102302A true RU95102302A (en) 1997-05-20
RU2097646C1 RU2097646C1 (en) 1997-11-27

Family

ID=20164897

Family Applications (1)

Application Number Title Priority Date Filing Date
RU95102302A RU2097646C1 (en) 1995-02-17 1995-02-17 Method of prevention of development of flaws in pipe line walls

Country Status (1)

Country Link
RU (1) RU2097646C1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2484359C1 (en) * 2011-11-01 2013-06-10 Общество с ограниченной ответственностью "ВолгаУралСпецстрой" Method of pipeline repair and device to this end
RU2601782C1 (en) * 2015-06-10 2016-11-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Уфимский государственный нефтяной технический университет" Method for pipeline restoration and device for implementation thereof
RU2693940C1 (en) * 2018-03-29 2019-07-08 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" Method of sealing cracks in pipeline wall and device for its implementation

Also Published As

Publication number Publication date
RU2097646C1 (en) 1997-11-27

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Legal Events

Date Code Title Description
MM4A The patent is invalid due to non-payment of fees

Effective date: 20070218