EP0006882A1 - Blank for pipe manufacture - Google Patents
Blank for pipe manufactureInfo
- 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- Withdrawn
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
Claims
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)
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IL31940A (en) * | 1968-04-05 | 1971-08-25 | Dynamit Nobel Ag | Sections from thermoplastic resins |
DE2321553C2 (en) * | 1972-08-30 | 1983-10-20 | Steward Plastics, Inc., Santa Ana, Calif. | Device for producing a helically wound flexible pipe |
-
1977
- 1977-08-02 SE SE7708787A patent/SE7708787L/en unknown
-
1978
- 1978-07-17 GB GB7910939A patent/GB2021033B/en not_active Expired
- 1978-07-17 WO PCT/SE1978/000023 patent/WO1979000079A1/en unknown
- 1978-07-26 DK DK332778A patent/DK332778A/en not_active Application Discontinuation
- 1978-08-01 JP JP9319878A patent/JPS5452184A/en active Pending
-
1979
- 1979-02-27 EP EP78900071A patent/EP0006882A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO7900079A1 * |
Cited By (1)
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 |
---|---|
WO1979000079A1 (en) | 1979-02-22 |
GB2021033B (en) | 1982-05-06 |
DK332778A (en) | 1979-02-03 |
JPS5452184A (en) | 1979-04-24 |
GB2021033A (en) | 1979-11-28 |
SE7708787L (en) | 1979-02-03 |
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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 |