SU1267097A1

SU1267097A1 - Method for repairing underwater pipeline

Info

Publication number: SU1267097A1
Application number: SU853903261A
Authority: SU
Inventors: Александр Иосифович Озерянский; Виктор Яковлевич Кононенко; Игорь Маврикиевич Савич
Original assignee: Экспедиционный Отряд Подводно-Технических Работ Главтранснефти
Priority date: 1985-05-31
Filing date: 1985-05-31
Publication date: 1986-10-30

Abstract

Изобретение позвол ет снизить трудоемкость работ при ремонте подводного трубопровода с заменой дефектного участка. При этом отпадает необходимость подгонки ремонтной катушки к концам трубопровода, поскольку вырезка дефектного участка и замена его ремонтной катушкой осуществл етс отдельными идентичными элементами поэтапно, что исключает нарушение соосности концов ремонтируемого трубопровода. 7 ил.The invention makes it possible to reduce the complexity of work during the repair of an underwater pipeline with the replacement of a defective section. This eliminates the need to fit the repair coil to the ends of the pipeline, since cutting out the defective area and replacing it with the repair coil is carried out by separate identical elements in stages, which eliminates the misalignment of the ends of the pipeline being repaired. 7 il.

Description

Изобретение относится к трубопроводному транспорту жидкостей и газов и·предназначено для ремонта подводных трубопроводов с заменой дефектного участка.The invention relates to pipeline transport of liquids and gases and is intended for the repair of underwater pipelines with the replacement of a defective area.

Цель изобретения - снижение трудоемкости работ за счет исключения подгонки ремонтной катушки.The purpose of the invention is to reduce the complexity of the work by eliminating the fitting of the repair coil.

На фиг. 1-7 схематически изображена последовательность этапов на замене дефектного участка ремонтной катушкой, состоящей из двух элементов полукатушек (утолщенными линиями на чертеже показаны операции, выполняемые на каждом этапе).In FIG. 1-7 schematically shows the sequence of steps for replacing a defective area with a repair coil consisting of two half-coil elements (thickened lines in the drawing show the operations performed at each stage).

Способ осуществляют следующим образом.The method is as follows.

Поврежденный участок 1 трубопровода 2 размечают при помощи шаблона на элементы, подлежащие последовательной вырезке.The damaged section 1 of the pipeline 2 is marked with a template on the elements to be sequentially cut.

Одним из известных способов, например электрокислородной или электродуговой полуавтоматической резкой, вырезают первую половину дефектного участка 1. У резаЗ выполняют притупление и скос кромок под сварку. Затем трубу зачищают по всей длине реза 3 снаружи и внутри на ширину 50-100 мм от коррозии изоляции и отложений.One of the known methods, for example, electro-oxygen or semi-automatic arc cutting, cut the first half of the defective section 1. At rezAZ, blunting and beveling of the edges for welding are performed. Then the pipe is cleaned along the entire length of the cut 3 outside and inside to a width of 50-100 mm from corrosion of insulation and deposits.

После этого к полукольцевым вырезам изнутри приваривают подкладные элементы 4, изготовленные из мягкой стали. Используя вырезанную часть дефектного участка 1 как шаблон, из той же трубы, что и поврежденный трубопровод 2, изготавливают и устанавливают на место выреза 3 полукатушку 5. Последнюю изготавливают со скосом кромок и притуплением и прижимают к подкладным элементам 4 с помощью стурбцин (или звенных центраторов, прижимов и т.п.) . Затем по лукатушку 5 сваривают с трубопроводом 2 по линиям полукольцевых вырезов 6.After that, to the semicircular cutouts from the inside, underlay elements 4 are made of mild steel. Using the cut-out part of the defective section 1 as a template, from the same pipe as the damaged pipe 2, a half-coil 5 is made and installed in place of the cutout 3. The latter is made with bevelled edges and blunted and pressed to the underlay elements 4 with the help of sturbtsins (or link centralizers clamps, etc.). Then on lakatushki 5 is welded with a pipe 2 along the lines of half-ring cutouts 6.

На следующем этапе вырезают нижнюю половину дефектного участка 1, Повторяют операции по зачистке и'выполняют притупление и скос кромок реза 7. Затем к полукольцевым выре10 зам 7 и горизонтальным участкам вваренной полукатушки 5 изнутри приваривают подкладные элементы 8 и подкладные пластины 9. Аналогично первой изготавливают вторую полукатушку 15 10, устанавливают и сваривают ее с трубопроводом 2 по линиям полукольцевых вырезов 11 и с первой полукатушкой по линиям горизонтального реза 12.At the next stage, the lower half of the defective section 1 is cut out, the cleaning operations are repeated, and the blunting of the edges of the cut 7 is performed. Then, the backing elements 8 and the backing plates 9 are welded from the inside to the half-ring cutouts 10 7 and to the horizontal sections of the welded half-coil 5. half-coil 15 10, install and weld it with the pipeline 2 along the lines of the half-ring cutouts 11 and with the first half-coil along the lines of the horizontal cut 12.

Claims

The invention relates to pipeline transport of liquids and gases, and is intended for the repair of subsea pipelines with the replacement of a defective section. The purpose of the invention is to reduce the labor intensity by eliminating the fitting of the repair coil. FIG. 1-7 schematically depicts a sequence of steps for replacing a defective area with a repair coil consisting of two elements of semi-coils with thickened lines on. The drawing shows the operations performed at each stage). The method is carried out as follows. The damaged section 1 of the pipeline 2 is marked with a template on the elements to be sequenced cutting. One of the known methods, such as electro-acid or electro-arc semi-automatic cutting, cuts out the first half of the defective section 1, At the cut-3, the blunting and beveling of the edges for welding are performed. Then the pipe is cleaned along the entire length of the cut 3 from the outside and inside for a width of 50-100 mm from corrosion of insulation and deposits. After that, lining elements 4, made of mild steel, are welded to the semi-circular saw head from the inside. Using the impacted hour of the defective area 1 as a template, the semi-coil 5 is made and installed into the cut-out 3 of the same pipe as the damaged pipe 2, the latter is made with bevel edges and blunting and pressed to the backing plates 4 using a sturbcin (or centre rators, clamps, etc.). Then, 972, coil 5 is welded to pipeline 2 along the lines of half-ring cuts 6. In the next step, cut out the lower half of the defective section 1, clean up operations are repeated and the cutting edge 7 is blunt and beveled. 5, the lining elements 8 and the lining plates are welded on the inside 5. Similarly, the first half-coil 10 is made of the first one, installed and welded to the pipeline 2 along the lines of the half-ring cuts 11 and the first half-round along the horizontal cutting machine 12. Formula of the invention A method for repairing an undersea pipeline by cutting and removing a defective area, installing an identical repair coil in its place and connecting it to the ends of the pipeline by welding with installing backfill elements, characterized in that, in order to reduce the labor-intensive work due to excluding the fitting of the repair coil, the defective section and the repair coil are divided into identical elements, the first element of the defective section is cut out, replaced with a similar element of the repair section shki and cutting each successive element defective portion is produced out after welding the previous coil element towards the ends of the pipeline, wherein the welding of the mating of the coil elements to each other along the pipeline performed on backer plates.

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