GB2373559A - Applying a heat shrinkable protective sleeve and marine mastic onto a pipe - Google Patents

Applying a heat shrinkable protective sleeve and marine mastic onto a pipe Download PDF

Info

Publication number
GB2373559A
GB2373559A GB0204647A GB0204647A GB2373559A GB 2373559 A GB2373559 A GB 2373559A GB 0204647 A GB0204647 A GB 0204647A GB 0204647 A GB0204647 A GB 0204647A GB 2373559 A GB2373559 A GB 2373559A
Authority
GB
United Kingdom
Prior art keywords
sleeve
mastic
sheet
adhesive
marine
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.)
Granted
Application number
GB0204647A
Other versions
GB0204647D0 (en
GB2373559B (en
Inventor
Brian Dunsterville
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.)
EDRO Ltd
Winn and Coales International Ltd
Original Assignee
EDRO Ltd
Winn and Coales International Ltd
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 EDRO Ltd, Winn and Coales International Ltd filed Critical EDRO Ltd
Publication of GB0204647D0 publication Critical patent/GB0204647D0/en
Publication of GB2373559A publication Critical patent/GB2373559A/en
Application granted granted Critical
Publication of GB2373559B publication Critical patent/GB2373559B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0067—Using separating agents during or after moulding; Applying separating agents on preforms or articles, e.g. to prevent sticking to each other
    • B29C37/0075—Using separating agents during or after moulding; Applying separating agents on preforms or articles, e.g. to prevent sticking to each other using release sheets
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/0608—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
    • B29C61/0616—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms layered or partially layered preforms, e.g. preforms with layers of adhesive or sealing compositions
    • 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
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/38—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses
    • B29C63/42—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses using tubular layers or sheathings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B11/00—Layered products comprising a layer of bituminous or tarry substances
    • B32B11/04—Layered products comprising a layer of bituminous or tarry substances comprising such bituminous or tarry substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/02—Welded joints
    • F16L13/0254—Welded joints the pipes having an internal or external coating
    • F16L13/0272—Welded joints the pipes having an internal or external coating having an external coating
    • 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
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/181—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for non-disconnectible pipe joints
    • 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
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/40—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of definite length, i.e. discrete articles
    • B29C53/42—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of definite length, i.e. discrete articles using internal forming surfaces, e.g. mandrels
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/10—Making preforms having internal stresses, e.g. plastic memory by bending plates or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/72—Cured, e.g. vulcanised, cross-linked

Landscapes

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

Abstract

A sheet 20 is wrapped around an object 10, 12, and the edges of the sleeve 20 are sealed onto the item 10, 12. The sheet 20 encircles and makes contact with the element 10, 12, and overlaps onto itself, to form a sleeve 20. Molten marine mastic 26 is fed into a mould 24 that is placed around the article 10, 12. The asphalt 26, preferably at 180-220{C, shrinks the heat shrinkable sleeve 20 onto the object 10, 12. Preferably the heat shrink material 20 comprises cross-linked polyethylene or polypropylene, that shrinks predominately in the longitudinal direction. Preferably either the item 10, 12 or the sleeve 20 has an adhesive layer. The adhesive may be a bitumen mastic, butyl mastic or a hot melt adhesive. The sleeve 20 and marine mastic 26 protect a joint 14 on a concrete weight coated submarine pipeline 10, 12.

Description

METHOD OF APPLYING A HEAT SHRINKABLE PROTECTIVE COATING SYSTEM The present invention relates to a method of applying a protective shrink sleeve coating and marine mastic system to an element such as a welded joint of a concrete weight coated submarine pipeline.
It is well known to use heat shrinkable sleeves to protect the welded joints of steel pipelines from corrosion. The shrink sleeves are used in marine and sub sea environments. The sleeve is first applied to the welded joint or element which is then filled and sealed with hot poured marine mastic or sealant. To prevent the hot mastic or sealant from intruding under the sleeve the sleeve needs to be fully bonded to the element or pipe joint as ingress of such materials under the sleeve would adversely affect the properties of the coating. Normally, it is necessary to heat the sleeve by means of a gas torch in order to cause the sleeve to fully shrink down and also to bond fully to the entire surface of the pipe joint. With this type of sleeve, it is also important to ensure that shrinkage is made possible by first bonding the sleeve ends together by means of a"closure patch"applied after positioning the sleeve around the pipe joint.
Heat from the torch is needed to bond down the closure patch and then shrink down the sleeve. Application methods of this type are slow and costs are therefore high.
The present invention provides a method of applying a protective sleeve system to an element, comprising the steps of wrapping the element with a heat shrinkable sheet of protective material so that the sheet
encircles the element, makes contact with the element and overlaps onto itself to form a sleeve, sealing the edges of the sleeve to the element, placing a mould around the element and the sleeve and filling the mould with molten marine mastic to provide heat, whereby the sleeve shrinks into intimate contact with the element.
In this way, an exposed element such as a submarine pipeline can be protected quickly and easily. No gas torching nor use of a traditional closure patch is required. Sealing the edges of the sleeve prevents the ingress of molten marine mastic under the sleeve before final shrinkage occurs. The heat in the mould generated from the hot poured mastic provides sufficient heat to ensure final full shrinkage of the sleeve to the element.
The edges of the sleeve may be sealed to the element by winding a tape around part of the element adjacent each end of the sleeve and overlapping on to each end of the sleeve.
Preferably, the tape is wound so as also to overlap the end of a pre-applied coating on the element.
Alternatively, a mastic sealant may be applied around part of the element adjacent each end of the sleeve and overlapping on to the end of the sleeve.
Preferably, the sheet is a laminate comprising a polymeric sheet having a layer of adhesive, which may be bitumen mastic, butyl mastic, or hot melt adhesive, on one surface thereof.
The polymeric sheet may be formed of polyethylene or polypropylene, which has been cross linked by
irradiation or by chemical means and stretched. Conveniently, the laminate further comprises a release interleaf removably applied to the layer of adhesive compound, and the interleaf is removed prior to wrapping the laminate around the element. The interleaf sheet may be around 20-100 g/m2 in weight.
This allows the sheet to be easily applied to the element.
Preferably, the thickness of the polymeric sheet is in the range of approximately 0.5-1. 5 mm and the thickness of the adhesive layer may be in the range of approximately 0.5-1. 5 mm.
Preferably, the protective sheet has a shrinkage predominantly in the longitudinal direction.
The molten marine mastic may be at a temperature in the range of approximately 180-220oC.
Typically, the element to be protected comprises a pipe.
The present invention will now be described in detail with reference to the accompanying drawing, Figure 1, which shows a schematic cross sectional view of a pipe having a corrosion protective sleeve applied in accordance with the method of the invention.
Figure 1 shows two portions of pipe 10,12 joined by a weld 14. Typically, the pipes 10,12 are steel, with a factory applied corrosion protective coating 16 applied at the manufacture stage around the outer circumference, extending over the majority of their length. However, at each end the steel pipe 10,12 protrudes beyond the coating 16, allowing adjoining
pipes 10, 12 to be welded together.
An outer weight coating of concrete 18 surrounds the corrosion protective coating 16, but the latter protrudes beyond the end of the concrete coating 18.
Thus, after welding the adjoining ends of pipes 10,12 together, a portion of steel wall remains exposed and corrosion protection applied in situ is required. In accordance with the invention, a sheet of protective material 20 is wrapped around the exposed wall overlapping a short distance onto itself to form a sleeve. The dimensions of the sheet 20 are such that it completely covers the exposed wall and overlaps a short distance on to the ends of the protective coating 16. A tape 22 is wound around each pipe 10, 12 so as to cover the edge of the laminated sheet 20 and the exposed portion of corrosion protective coating 16, so that the tape 22 extends up to the end of the concrete coating 18. Alternatively, a mastic sealant may be applied over the ends of the sheet 20 and protective coating 16. Either method seals the edges of the sheet 20 to prevent the ingress of material beneath the sheet 20.
As discussed further below, an outer mould 24 is then placed around the entire assembly and filled with molten marine mastic 26. The mould 24 is typically a thin steel sheet applied by hand.
Preferably, the sheet 20 is a laminate which consists of a polymeric sheet which may be polyethylene, polypropylene or another polymer, co-polymer or polymer blend. Typically, the thickness of the polymeric sheet is in the range of approximately 0.51.5 mm.
A layer of adhesive compound which may be bitumen mastic, butyl mastic or hot melt mastic is provided on one surface of the polymeric sheet. Typically, the thickness of the adhesive layer is also in the range of approximately 0. 5-1. 5 mm. Bitumen mastic adhesive compounds are well known and understood to include bitumen based materials, with or without polymer modification.
For ease of handling, a removable interleaf may be provided on the top of the adhesive layer. The release interleaf is typically around 20-100 g/m2 and this is removed prior to use of the laminate.
The polymeric sheet is cross-linked by irradiation or chemical means and is stretched prior to the laminate being used. This may occur either before or after the adhesive is applied to the polymeric sheet. The cross linking and stretching provide an end product that shrinks predominately in the longitudinal direction (which becomes the circumferential direction when the sheet is wrapped around an element such as a pipe) and excellent heat resistance, i. e. resistance to transient temperatures of about 220oC.
The laminate 20 may be supplied in the form of sheets or rolls. In use, the release interleaf layer, if present, is peeled off and the adhesive surface of the laminate 20 is applied directly onto the surface of the steel pipe 10,12.
The molten marine mastic 26 used to fill the mould is typically D2S mastic, at temperatures in the range of approximately 180-220 C. Heat is absorbed from the molten marine mastic 26 which causes the laminate 20 to shrink into intimate contact with the pipes 10,12.
The molten marine mastic 26 cools to form a solid mass
which, together with mould 24, remain in situ for the service life of the pipes 10, 12.
The tape 22 (if used) is a conventional cold applied corrosion protective tape which may be a layer of PVC film coated on one surface with polymer modified bitumen adhesive compound. This is readily conformable with the contours of the laminate sheet 20 and the stepped profile formed by the end of the corrosion protective coating 16. Use of the tape 22 results in considerable time saving, which is a notable benefit because the speed of application is very important in offshore pipe laying operations.
The tape 22 also prevents incursion of the marine mastic 24 beneath the edges of the laminate sheet 20 and the walls of the pipes 10,12.
The present invention provides a number of other advantages. Use of the mould filled with molten marine mastic 26 avoids the need to use a gas torch for post application heating of the laminate 20. The so-called"closure patch"used in the prior art is also not required at the overlapping ends of the laminate 20.
Thus, the skilled reader will appreciate that the present invention provides an improved method of forming a protective sleeve on a pipeline, from a heat shrinkable laminate, which simplifies and speeds up the process of forming the sleeve. Although one preferred embodiment of the invention has been described, it will be apparent that modifications and variations to the precise details described may be made without departing from the scope of the invention as set out in the claims.

Claims (17)

  1. CLAIMS 1. A method of applying a protective sleeve system to an element, comprising the steps of wrapping the element with a heat shrinkable sheet of protective material so that the sheet encircles the element, makes contact with the element and overlaps onto itself to form a sleeve, sealing the edges of the sleeve to the element, placing a mould around the element and the sleeve and filling the mould with molten marine mastic to provide heat, whereby the sleeve shrinks into intimate contact with the element.
  2. 2. A method as claimed in claim 1, wherein the edges of the sleeve are sealed to the element by winding a tape around part of the element adjacent each end of the sleeve and overlapping on to each end of the sleeve.
  3. 3. A method as claimed in claim 2, wherein the tape is wound so as also to overlap the end of a preapplied coating on the element.
  4. 4. A method as claimed in claim 1, wherein the edges of the sleeve are sealed to the element by applying a mastic sealant around part of the element adjacent each end of the sleeve and overlapping on to the ends of the sleeve.
  5. 5. A method as claimed in any preceding claim wherein the sheet is a laminate comprising a polymeric sheet having a layer of adhesive on one surface thereof.
  6. 6. A method as claimed in claim 5, wherein the
    adhesive comprises bitumen mastic, butyl mastic or hot melt adhesive.
  7. 7. A method as claimed in claim 5 or claim 6, wherein the polymeric sheet is formed of polyethylene or polypropylene.
  8. 8. A method as claimed in any of claims 5 to 7, wherein the polymeric sheet has been cross linked by irradiation or chemical means and stretched.
  9. 9. A method as claimed in any of claims 5 to 8, wherein the laminate further comprises a release interleaf removably applied to the layer of adhesive, and the interleaf is removed prior to wrapping the laminate around the element.
  10. 10. A method as claimed in claim 9, wherein the interleaf is approximately 20-100 g/m2 in weight.
  11. 11. A method as claimed in any of claims 5 to 10, wherein the thickness of the polymeric sheet is in the range of approximately 0.5-1. 5 mm.
  12. 12. A method as claimed in any of claims 5 to 11, wherein the thickness of the adhesive layer is in the range of approximately 0.5-1. 5 mm.
  13. 13. A method as claimed in any preceding claim, wherein the protective sheet has a shrinkage predominantly in the longitudinal direction.
  14. 14. A method as claimed in any preceding claim, wherein the molten marine mastic is at a temperature in the range of approximately 180-2200C.
  15. 15. A method as claimed in any preceding claim, wherein the element comprises a pipe.
  16. 16. A pipe having a heat-shrunk sleeve applied by a method in accordance with any preceding claim.
  17. 17. A method of applying a sleeve to an element substantially as hereinbefore described and with reference to the accompanying drawing.
GB0204647A 2001-02-27 2002-02-27 Method of applying a heat shrinkable protective coating system Expired - Fee Related GB2373559B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0104881.8A GB0104881D0 (en) 2001-02-27 2001-02-27 Heat shrinkable laminate

Publications (3)

Publication Number Publication Date
GB0204647D0 GB0204647D0 (en) 2002-04-10
GB2373559A true GB2373559A (en) 2002-09-25
GB2373559B GB2373559B (en) 2003-03-26

Family

ID=9909643

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB0104881.8A Ceased GB0104881D0 (en) 2001-02-27 2001-02-27 Heat shrinkable laminate
GB0204647A Expired - Fee Related GB2373559B (en) 2001-02-27 2002-02-27 Method of applying a heat shrinkable protective coating system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB0104881.8A Ceased GB0104881D0 (en) 2001-02-27 2001-02-27 Heat shrinkable laminate

Country Status (1)

Country Link
GB (2) GB0104881D0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2458282C2 (en) * 2010-05-12 2012-08-10 Талгат Вилевич Галиуллин Rolled mastic material on textile base tape impregnated with mastic using asphaltic resinous oligomers (versions)
CN107415352A (en) * 2017-05-20 2017-12-01 江苏君成建材科技有限公司 Novel environment friendly waterproof building material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079610A1 (en) * 1981-11-18 1983-05-25 Ube Industries, Ltd. Method of forming covering protecting layer on joint between covered steel pipes
JPS61233075A (en) * 1985-04-08 1986-10-17 Fujimori Kogyo Kk Heat-shrikable pressure-sensitive adhesive tape
US4874665A (en) * 1987-01-14 1989-10-17 The Kendall Company Heat shrinkable wraps
WO1993024782A1 (en) * 1992-05-22 1993-12-09 N.V. Raychem S.A. Protection of pipe joints
US5397615A (en) * 1991-01-09 1995-03-14 N.V. Raychem S.A. Heat shrinkable wraparound articles for covering elongate objects

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079610A1 (en) * 1981-11-18 1983-05-25 Ube Industries, Ltd. Method of forming covering protecting layer on joint between covered steel pipes
JPS61233075A (en) * 1985-04-08 1986-10-17 Fujimori Kogyo Kk Heat-shrikable pressure-sensitive adhesive tape
US4874665A (en) * 1987-01-14 1989-10-17 The Kendall Company Heat shrinkable wraps
US5397615A (en) * 1991-01-09 1995-03-14 N.V. Raychem S.A. Heat shrinkable wraparound articles for covering elongate objects
WO1993024782A1 (en) * 1992-05-22 1993-12-09 N.V. Raychem S.A. Protection of pipe joints

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Materials http://www.hesselberg-hydro.com/materials.htm Hesselburg Hydr [veiwed 12 July 2002] published 18 September 2000 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2458282C2 (en) * 2010-05-12 2012-08-10 Талгат Вилевич Галиуллин Rolled mastic material on textile base tape impregnated with mastic using asphaltic resinous oligomers (versions)
CN107415352A (en) * 2017-05-20 2017-12-01 江苏君成建材科技有限公司 Novel environment friendly waterproof building material

Also Published As

Publication number Publication date
GB0204647D0 (en) 2002-04-10
GB2373559B (en) 2003-03-26
GB0104881D0 (en) 2001-04-18

Similar Documents

Publication Publication Date Title
US5302428A (en) Multi-layer wraparound heat shrink sleeve
US5175032A (en) Heat shrinkable closure sheets and sleeve structures and methods employing the same
US4728550A (en) Coated recoverable articles
US6736430B1 (en) Method of sealing a joint between two pipes
EP0575333B1 (en) Heat shrinkable wraparound articles for covering elongate objects
JPH03100086A (en) New tape covering
US20040028862A1 (en) Fibrous closure for heat-shrinkable covers
JP2006194368A (en) Anticorrosive coating structure for site welded part
EP0079610B1 (en) Method of forming covering protecting layer on joint between covered steel pipes
AU594762B2 (en) Shrinkable pipe wrapping
GB2373559A (en) Applying a heat shrinkable protective sleeve and marine mastic onto a pipe
US20080057315A1 (en) Method of application of heat-shrinkable articles
JP2561980B2 (en) New tape coating
EP1104533A1 (en) Pipe corrosion protection
EP0641424A1 (en) Protection of pipe joints
AU663433B2 (en) Multi-layer wraparound heat shrink sleeve
JPH06240699A (en) Coating method for joint section of anticorrosive steel pipe
JPS6312995Y2 (en)
JP2857315B2 (en) Corrosion prevention coating method for metal pipe connection
JPH0913181A (en) Corrosion preventive method and corrosion preventive structure of weld zone of steel pipe
JPS6319677Y2 (en)
JPH0357852B2 (en)
JPH0358903B2 (en)
JPS5854011B2 (en) Corrosion prevention method for steel pipes
JPS6090739A (en) Covering method of t-shaped tube

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100227