EP0006882A1 - Blank for pipe manufacture - Google Patents

Blank for pipe manufacture

Info

Publication number
EP0006882A1
EP0006882A1 EP78900071A EP78900071A EP0006882A1 EP 0006882 A1 EP0006882 A1 EP 0006882A1 EP 78900071 A EP78900071 A EP 78900071A EP 78900071 A EP78900071 A EP 78900071A EP 0006882 A1 EP0006882 A1 EP 0006882A1
Authority
EP
European Patent Office
Prior art keywords
blank
bulge
tube
pipe
adjacent
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP78900071A
Other languages
German (de)
French (fr)
Inventor
Orvar(Deceased) Legally Represented By Elmqvist Astrid Gunhild Mathilda Elmqvist
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0006882A1 publication Critical patent/EP0006882A1/en
Withdrawn legal-status Critical Current

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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
    • F16L11/16—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics wound from profiled strips or bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/78—Winding and joining, e.g. winding spirally helically using profiled sheets or strips
    • 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
    • F16L9/00—Rigid pipes
    • F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement

Definitions

  • This invention relates to a blank for pipe manufacture and has the object of producing a pipe blank adapted for continuous pipe manufact- ' ⁇ re in connection with immediate laying of the pipe, for example in the sea on great depth.
  • a pipe blank according to the invention is designed so that it is pos sible in immediately consecutive steps to extrude the pipe blank, to roll the pipe blank to a pipe with a diameter within a wide diameter range, to attach adjacent turns comprised in the pipe to each other and to lay the pipe thus manufactured into position in lakes, the sea or in earth on land.
  • the pipe blank shown in the drawing consists of a first lateral edge 11 , a second lateral edge 12, a central portion 13 located between said two lateral edges, a first plane wall portion 14 jointing said first lateral edge 11 and said central portion 13, and a second plane wall portion 15 jointing said second lateral edge 12 and said central portion 13.
  • the lateral edge 11 is formed with a trapezoid outward bulge 16
  • the lateral edge 12 is formed with an inward bulge 17 correspond ⁇ ing to the outward bulge 16.
  • the pipe blank is intended to be wound helically so that a joint is formed between adjacent turns in the helically wound pipe thereby, that the outward bulge 16 in a turn is fitted into the inward bulge 17 in an adjacent turn.
  • Said central portion 13 has an outward bulge of such configuration, that the .surface 18 enclosing the bulge is substantially greater than the surface 21 between the two adjacent edges 19, 20 on the blank, which edges constitute the places of attachment of the bulge.
  • the surface 18 enclosing the bulge further includes distances, for example, the distance 22, approximately in parallel with the transverse direction of the wall blank, which distances are substantially longer than the distance 23 between the adjacent edges 19, 20 on the blank.
  • the blank shown in the drawing by way of example has an outward bulge in the central portion 13 of substantially circular shape. Said bulge will be located on the outside of the completed pipe. Said bulge has the twofold object of providing the pipe with an elastic "bellows" function in order to reduce the stres ses arising by the effect of wave movements on the pontoon, to which the pipe is attached, and of rendering the pipe more rigid against compression.
  • the detail design of the bulge depends on the strength properties of the pipe material and on the "bellows" function, which the pipe can be imagined to suit ⁇ ably carry out in individual cases.
  • the inside of the pipe is desired to be as smooth as possible in order to permit the highest possible degree of laminar flow through the pipe.
  • the ratio between the surface 18 enclosed by the bulge and the surface 21 between the edges 19, 20 is about 50 :1.
  • the ratio between the longest distance -within the bulge in parallel with the transverse direction of the wall blank, i. e . the diameter, and the shortest distance 23 between the adjacent edges 19, 20 is about 15 :1.
  • a pipe made only of polythene plastics is lighter than water, and therefore the plastic material for pipes to be laid on great depth in the sea preferably should be admixed with some kind of filler material, for example soot, graphite, talc or the like, in order to suitably adjust the weight of the completed pipe to the weight of the ambient water.
  • a suitable material composition may be about 7 parts of polythene and 1 part of graphite, yielding a mass having substantial ⁇ ly the same density as sea water.
  • the bulge 16 is formed with a cavity 24, and the lateral edge 12 is provided with two horns 25, 26 in immediate connection to the inward bulge 17.
  • special members for example rollers, on the machine, which forms the blank to a pipe, it is easy to somewhat compres s the outward bulge 16 and to cause the horns 25, 26 to slightly approach each other during the moment when a new turn in the pipe is to be attached to the nearest adjacent turn in the pipe.
  • the horns 25, 26 like the bulge of the central portion 13 also have a stiffening effect and counteract compres sion of the pipe.
  • the surface 27 of the lateral edge 11 which surface is located on the same side as the outward bulge 16 is welded to the surface 28 of the lateral edge 12, which surface is located on the same side as the inward bulge 17, and the surface 29 of the lateral edge 11 , which surface is located closer to the central portion 13 than the surface 27, is welded to the surface 30 of the lateral edge 12, which surface is located farther away from the central portion 13 than the surface 28.
  • the completed pipe thus, shows continuous welding joints on both sides of the continuous place of attachment 16-17.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

Ebauche pour la fabrication d'un tube, destinee a etre enroulee helicoidalement de maniere a former un joint entre deux spires adjacentes dans une ebauche enroulee helicoidalement. A cet effet, une partie sur un bord lateral (11) de l'ebauche dans une spire s'ajuste dans une partie de l'autre bord lateral (12) de l'ebauche dans une spire adjacente. Une partie (13) situee entre les deux dites parties sur les bords lateraux presente une saillie vers l'exterieur enfermant une cavite. Cette saillie a une forme telle que la surface (18) de la cavite comprise dans une coupe transversale de l'ebauche est sensiblement plus grande que la surface (21) comprise dans ladite section entre les deux bords adjacents (19, 20). Ces derniers sont les endroits de fixation de la protuberance. La surface (18) de la cavite inclut de plus des distances (22) dans ladite coupe sensiblement parallele a la direction transversale de l'ebauche formant paroi. Ces distances sont plus grandes que la distance (21) entre les bords adjacents (19, 20) sur l'ebauche. Lorsqu'on forme un tube, la saillie se trouve a l'exterieur du tube termine. Elle a deux effets: donner au tube le role d'un soufflet elastique de maniere a reduire les contraintes lors de mouvements du tube, et rendre le tube plus resistant a la compression.Blank for the manufacture of a tube, intended to be helically wound so as to form a joint between two adjacent turns in a helically wound blank. For this purpose, a part on a lateral edge (11) of the blank in a turn fits in a part of the other lateral edge (12) of the blank in an adjacent turn. A part (13) located between the two said parts on the lateral edges has an outward projection enclosing a cavity. This projection has a shape such that the surface (18) of the cavity included in a cross section of the blank is substantially larger than the surface (21) included in said section between the two adjacent edges (19, 20). These are the fixing points of the protuberance. The surface (18) of the cavity further includes distances (22) in said section substantially parallel to the transverse direction of the wall blank. These distances are greater than the distance (21) between the adjacent edges (19, 20) on the blank. When forming a tube, the projection is outside the finished tube. It has two effects: to give the tube the role of an elastic bellows so as to reduce the stresses during movements of the tube, and to make the tube more resistant to compression.

Description

Blank for pipe manufacture
This invention relates to a blank for pipe manufacture and has the object of producing a pipe blank adapted for continuous pipe manufact- ' μre in connection with immediate laying of the pipe, for example in the sea on great depth.
It has been tried since a long time ago to sink welded sheet metal pipes of substantial length and diameter (500 m and, respectively,
2 m) in order to reach cold deep water . These efforts, however, have proved to involve enormous difficulties with respect to the manufact¬ ure proper of pipes of such length on land, to towing the pipes and sinking them into the sea, and to attaching the pipes to a movable pontoon. When pipes of such length and weight by water currents are forced to move in vertical direction, very high stres ses arise in the attachments. These difficulties are eliminated by manufacturing a pipe blank according to the invention and by manufacturing pipes of said pipe blank in the place where the pipe is planned to be laid.
A pipe blank according to the invention is designed so that it is pos sible in immediately consecutive steps to extrude the pipe blank, to roll the pipe blank to a pipe with a diameter within a wide diameter range, to attach adjacent turns comprised in the pipe to each other and to lay the pipe thus manufactured into position in lakes, the sea or in earth on land.
The characterizing features of a pipe blank according to the invention become apparent from the attached claims . The invention is describ¬ ed in greater detail in the following, with reference to the accompany¬ ing drawing, which is a schematic section through a pipe blank accord¬ ing to the invention.
The pipe blank shown in the drawing consists of a first lateral edge 11 , a second lateral edge 12, a central portion 13 located between said two lateral edges, a first plane wall portion 14 jointing said first lateral edge 11 and said central portion 13, and a second plane wall portion 15 jointing said second lateral edge 12 and said central portion 13. The lateral edge 11 is formed with a trapezoid outward bulge 16, and the lateral edge 12 is formed with an inward bulge 17 correspond¬ ing to the outward bulge 16. The pipe blank is intended to be wound helically so that a joint is formed between adjacent turns in the helically wound pipe thereby, that the outward bulge 16 in a turn is fitted into the inward bulge 17 in an adjacent turn. Said central portion 13 has an outward bulge of such configuration, that the .surface 18 enclosing the bulge is substantially greater than the surface 21 between the two adjacent edges 19, 20 on the blank, which edges constitute the places of attachment of the bulge. The surface 18 enclosing the bulge further includes distances, for example, the distance 22, approximately in parallel with the transverse direction of the wall blank, which distances are substantially longer than the distance 23 between the adjacent edges 19, 20 on the blank.
The blank shown in the drawing by way of example has an outward bulge in the central portion 13 of substantially circular shape. Said bulge will be located on the outside of the completed pipe. Said bulge has the twofold object of providing the pipe with an elastic "bellows" function in order to reduce the stres ses arising by the effect of wave movements on the pontoon, to which the pipe is attached, and of rendering the pipe more rigid against compression. The detail design of the bulge depends on the strength properties of the pipe material and on the "bellows" function, which the pipe can be imagined to suit¬ ably carry out in individual cases. The inside of the pipe is desired to be as smooth as possible in order to permit the highest possible degree of laminar flow through the pipe. In the embodiment shown in the drawing the ratio between the surface 18 enclosed by the bulge and the surface 21 between the edges 19, 20 is about 50 :1. The ratio between the longest distance -within the bulge in parallel with the transverse direction of the wall blank, i. e . the diameter, and the shortest distance 23 between the adjacent edges 19, 20 is about 15 :1.
As material in the blank polythene plastics, for example, can be chosen. A pipe made only of polythene plastics is lighter than water, and therefore the plastic material for pipes to be laid on great depth in the sea preferably should be admixed with some kind of filler material, for example soot, graphite, talc or the like, in order to suitably adjust the weight of the completed pipe to the weight of the ambient water. A suitable material composition may be about 7 parts of polythene and 1 part of graphite, yielding a mass having substantial¬ ly the same density as sea water.
OM As appears from the drawing, the bulge 16 is formed with a cavity 24, and the lateral edge 12 is provided with two horns 25, 26 in immediate connection to the inward bulge 17. By means of special members, for example rollers, on the machine, which forms the blank to a pipe, it is easy to somewhat compres s the outward bulge 16 and to cause the horns 25, 26 to slightly approach each other during the moment when a new turn in the pipe is to be attached to the nearest adjacent turn in the pipe. The horns 25, 26 like the bulge of the central portion 13 also have a stiffening effect and counteract compres sion of the pipe. When forming the pipe, the surface 27 of the lateral edge 11 , which surface is located on the same side as the outward bulge 16, is welded to the surface 28 of the lateral edge 12, which surface is located on the same side as the inward bulge 17, and the surface 29 of the lateral edge 11 , which surface is located closer to the central portion 13 than the surface 27, is welded to the surface 30 of the lateral edge 12, which surface is located farther away from the central portion 13 than the surface 28. The completed pipe, thus, shows continuous welding joints on both sides of the continuous place of attachment 16-17.
OMPI
A

Claims

Claims
1. A blank for pipe manufacture, intended to be wound helically so ', .that a joint is formed between adjacent turns in the helically wound blank thereby, that a portion on one lateral edge (11) on the blank in a turn is fitted into a portion on the remaining lateral edge (12) of the blank in an adjacent turn, characterized "in that a portion (13) located between said two portions on the lateral edges of the blank has a bulge, which encloses a cavity and has such configuration, that the surface (18) of the cavity enclosed by the bulge in a section through the transverse direction of the blank is substantially greater than the surface (21) in said section between the two adjacent edges (19, 20) on the blank, which edges constitute the places of attachment of the bulge, and that the surface (18) of the cavity enclosed by the bulge includes distances in said section substantially in parallel with the transverse direction of the wall blank, which distances (for example 22) are substantially longer than the distance (21) between said adjacent edges (19, 20) on the blank.
2. A blank according to claim 1, characterized in that the ratio between said surface (18) of the cavity enclosed by the bulge and the surface between the two adjacent edges (19, 20) is about 50:1, and the ratio between the longest distance (21) in parallel with the transverse direction of the wall blank in the surface of said cavity enclosed by the bulge and the shortest distance between said adjacent edges (19, 20) on the wall blank is about 15:1.
3. A blank according to claim 1 or 2, characterized in that the bulge has substantially circular shape.
EP78900071A 1977-08-02 1979-02-27 Blank for pipe manufacture Withdrawn EP0006882A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7708787 1977-08-02
SE7708787A SE7708787L (en) 1977-08-02 1977-08-02 SUBJECT FOR MANUFACTURE OF TUBE

Publications (1)

Publication Number Publication Date
EP0006882A1 true EP0006882A1 (en) 1980-01-23

Family

ID=20331944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78900071A Withdrawn EP0006882A1 (en) 1977-08-02 1979-02-27 Blank for pipe manufacture

Country Status (6)

Country Link
EP (1) EP0006882A1 (en)
JP (1) JPS5452184A (en)
DK (1) DK332778A (en)
GB (1) GB2021033B (en)
SE (1) SE7708787L (en)
WO (1) WO1979000079A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664314A (en) * 1982-10-01 1987-05-12 Spraying Systems Co. Whirl spray nozzle

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4457787A (en) * 1982-09-21 1984-07-03 Chugai Denki Kogyo Kabushiki-Kaisha Internal oxidation method of Ag alloys
GB2128709A (en) * 1982-10-16 1984-05-02 C J Cawte Drainage pipes
USD968335S1 (en) * 2020-05-29 2022-11-01 Xinghua Wei Socket
USD971850S1 (en) * 2020-08-17 2022-12-06 Yuyi Lee Power solution dome

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IE33028B1 (en) * 1968-04-05 1974-02-20 Dynamit Nobel Ag Improvements in or relating to plastics members
DE2321553C2 (en) * 1972-08-30 1983-10-20 Steward Plastics, Inc., Santa Ana, Calif. Device for producing a helically wound flexible pipe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO7900079A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664314A (en) * 1982-10-01 1987-05-12 Spraying Systems Co. Whirl spray nozzle

Also Published As

Publication number Publication date
SE7708787L (en) 1979-02-03
DK332778A (en) 1979-02-03
WO1979000079A1 (en) 1979-02-22
GB2021033A (en) 1979-11-28
GB2021033B (en) 1982-05-06
JPS5452184A (en) 1979-04-24

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): FR

17P Request for examination filed

Effective date: 19790809

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820513