GB2337367A - Elongated tubular product,suac as in particular an installation conduit - Google Patents

Elongated tubular product,suac as in particular an installation conduit Download PDF

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Publication number
GB2337367A
GB2337367A GB9919234A GB9919234A GB2337367A GB 2337367 A GB2337367 A GB 2337367A GB 9919234 A GB9919234 A GB 9919234A GB 9919234 A GB9919234 A GB 9919234A GB 2337367 A GB2337367 A GB 2337367A
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GB
United Kingdom
Prior art keywords
lubricant
tubular product
solid
product according
particles
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
GB9919234A
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GB9919234D0 (en
GB2337367B (en
Inventor
Christian Blanc
Eric Pirony
Claude Trichard
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.)
Novoplastic SA
Original Assignee
Novoplastic SA
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 Novoplastic SA filed Critical Novoplastic SA
Publication of GB9919234D0 publication Critical patent/GB9919234D0/en
Publication of GB2337367A publication Critical patent/GB2337367A/en
Application granted granted Critical
Publication of GB2337367B publication Critical patent/GB2337367B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • 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
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
    • F16L11/121—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting specially profiled cross sections
    • 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
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/26—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting the pipes all along their length, e.g. pipe channels or ducts
    • 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
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/121—Rigid pipes of plastics with or without reinforcement with three layers
    • 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
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4459—Ducts; Conduits; Hollow tubes for air blown fibres
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0462—Tubings, i.e. having a closed section
    • H02G3/0481—Tubings, i.e. having a closed section with a circular cross-section
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G9/00—Installations of electric cables or lines in or on the ground or water
    • H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Lubricants (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Laminated Bodies (AREA)
  • Insulated Conductors (AREA)
  • Electric Cable Installation (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The invention concerns an elongated tubular product with the same cross section along its whole length, comprising a solid tube (1) made of at least a plastic material, both sufficiently flexible to be wound and unwound, and sufficiently rigid to resist a centripetal or centrifugal radial force, said solid tube comprising, on the inside and/or on the outside, a surface coating (3) whose free surface constitutes a friction surface and comprising a plastic matrix in which is distributed a lubricant. The invention is characterised in that, with synergistic effect, the particles (4) of a solid lubricant are distributed in the plastic matrix, at least partly flush at the free surface of the surface coating, and a liquid lubricant compatible with the plastic matrix, is dispersed in the surface coating, practically without wetting the free surface of the latter.

Description

ELONGATE TUBULAR PRODUCT, ESPECIALLY OF THE INSTALLATION DUCT TYPE The
present invention relates to an elongate tubular product, having in general the same cross section over its entire longitudinal direction, and comprising a solid tube consisting of at least one plastic, which is both sufficiently flexible for it to be wound up and unwound and sufficiently rigid for it to withstand a centripetal or centrifugal radial force.
From the above generic definition, the present invention should be understood to encompass under the same concept, for example, equally well an installation duct, for one or more cables or one or more pipes, subsequently contained in the said installation duct, as a protective sheath for one or more cables, for example power cables.
Moreover, from the terms "cables" and "pipes", the present invention should be understood to cover any duct which allows, in general, transfer or transport of a flow, whether this is of a fluid (water or gas, for example), of energy (electricity, for example), or else of information or signals (video transmission via optical cable, for example), or of data in the form of electrical signals, be they analogue, digital, etc.
In order to introduce and define the present invention, reference is now given, by way of example, to installation ducts and/or to cables or pipes installed in the said ducts.
In order to limit the amount of civil engineering work, and in particular the number of jointing chambers, it is known to lubricate the friction surface, corresponding to the inner surface of the solid tube forming the installation duct and/or the outer surface of the protective sheath, for example the cable protection sheath. This makes it possible in fact to increase the length of tube which can be installed.
This lubrication is generally provided by a surface layer on the inside and/or outside of the tube, the free surface of which constitutes a friction surface.
Various solutions have been proposed for this purpose.
According to document W093/14546, the surface layer consists of a lubricating film or coating, either in solid or liquid form. In the case of a solid lubricating coating, this may, for example, be a plastic matrix made of polyethylene in which solid particles, for example graphite particles, may be distributed. In the case of a liquid lubricating coating, this may, for example, oil.
Document EP-0,326,711 describes a solution comparable to that defined above, in the sense that the solid surface layer constitutes the internal layer of a tube coextruded with an external layer.
According to document DE-3,539,304, the surface layer, consisting of a grease or paste which is lubricating, but adherent, is added and remains on the inside of the tube.
This lubricating paste or grease itself consists of a mixture of a liquid lubricant and particles of a solid lubricant.
The subject of the present invention is an elongate tubular product, with permanent, almost dry lubrication of the friction surface or surfaces of the solid tube, significantly decreasing the frictional forces, including those compared with the solutions identified and discussed above.
For this purpose, according to the invention, a synergistic action has been discovered between:
- on the one hand, particles of a solid-type lubricant, which are distributed in the plastic matrix of the surface layer and are at least partly flush with the free surface of the latter; and be a silicone-based 3 - on the other hand, a liquid-type lubricant, compatible with the plastic matrix, which lubricant is dispersed in the surface layer virtually without wetting the free surface of the latter.
The observed synergistic effect may be explained by the fact that the particles of the solid lubricant which are flush with the surface are as it were lubricated in turn by the liquid lubricant wetting them.
By virtue of the present invention, installation duct becomes, as it were, a general-purpose duct in the sense that it is compatible, without any other modification, with all the current installation techniques, whether they be pulling techniques, for example using a small cable, or blowing techniques, for example using a pig, or by blowing-pushing.
Moreover, when the solid lubricant is an electrical conductor, the lubricating system according to the invention makes it possible to eliminate, at least in part, the static charges generated by the friction between the duct and the cable while the latter is being installed.
The present invention following secondary characteristics:
an therefore has the the solid lubricant has a lamellar structure, and is, for example, graphite, or else has a polymeric structure with oriented long straight chains, and is, for example, a polytetrafluoroethylene; the particles of the solid lubricant are microspheres having a diameter of at most 20 gm, and preferably of between 1 and 15 gm; - the licluid lubricant is preferably, but not exclusively, a silicone; it has a viscosity of at most 1000 centistokes, at room temperature, and, for example, of between 10 and 1000 centistokes, the thickness of the film of liquid lubricant on the free surface of the surface layer not exceeding 1 gm; - the solid lubricant_constitutes a filler; - 4 the surface layer is irregular over the perimeter of the solid tube and corresponds, for example, to longitudinal ribs or grooves; however, this same surface layer may be continuous over the perimeter of the solid tube.
Preferably, it is the solid tube which consists of just the plastic matrix in which, on the one hand, particles of the dry lubricant are distributed, these particles being partly flush with at least one, inner or outer, free surface and constituting a dry-friction surface, and, on the other hand, a liquid lubricant is diffused, virtually without wetting either the outer surface or the inner surface of this same matrix.
According to this preferred solution, the solid lubricant constitutes a filler, the proportion by weight of which is at least equal to 5% of the plastic matrix, especially between 5% by weight and 20% by -weight of this same matrix.
still according to this same preferred solution, the matrix includes, in the diffused state, a liquid lubricant, which constitutes as it were an additive, its proportion being at least equal to 0.02% by weight of the plastic matrix, and especially between 0. 02% by weight and 0.08% by weight of this same matrix. In this case, by way of example, the solid lubricant/liquid lubricant proportion is at least equal to 5% and is especially between 5% and 20%.
The present invention will now be described with reference to the appended drawing, in which:
- Figure 1 shows diagrammatically, in axial section, an installation duct according to the invention; - Figure 2 shows, in axial section, a sheath for protecting a cable according to the invention; and - Figure 3 shows, in cross section, an installation duct according to the invention, but in another embodiment of the latter.
According to Figure 1, an installation duct consists of a solid -or rigid.-.tube 1, made of a filled plastic (for example, high-density polyethylene)., which is both sufficiently flexible in order for it to be wound up and unwound and sufficiently rigid in order for it to withstand a centripetal or centrifugal radial force. This solid tube has a dry-friction surface corresponding to its inner surface.
According to the present invention, at least one surface layer 3 is formed in the solid tube 1, the free surface of this surface layer 3 constituting the dry-friction surface (inner surface 2). This surface layer comprises a plastic matrix, corresponding to that of the solid tube, in which particles 4 (microspheres) of a solid lubricant are distributed, these particles being partly flush with the free surface 2.
According to another embodiment of an installation duct according to the invention, shown in Figure 3, the latter comprises three concentric layers 6, 7 and 8, optionally made of respectively different plastics, namely the outer layer 7, the inner layer 6, in which the surface layer 3 is incorporated, and the other, middle layer or interlayer 8. The surface layer 3 is discontinuous over the perimeter of the solid tube 1 and comprises, for example, longitudinal ribs 9 or corresponding longitudinal adjacent grooves.
However, of course, this same surface layer 3 may be continuous over the perimeter of the solid tube 1.
As shown in Figure 4, the surface layer 3 is obtained by spraying or diffusing, inside the tube 1, after extrusion but in the viscoelastic phase, the solid lubricant in particulate form and mixed with the liquid lubricant.
In this way, the solid lubricant and the liquid lubricant are incorporated in the plastic matrix of the tube, at least on the surface.
EXAMPLE 1
A tube made of high-density polyethylene (HDPE), (commercial reference DAPLEN 4610 from the French company PCD), having an inside diameter of 27 mm and a thickness of 3 mm, is extruded on a CMS60 machine from the company Cincinatti.
A suspension of a polytetrafluoroethylene (PTFE) powder (commercial reference UNILUB T3 from the company Uniflon) having an average particle size of 16 im, in a silicone oil (commercial reference 47V100 from the company Pennwhite) having a viscosity of 100 centistokes, is sprayed in divided form, at the exit of the extrusion head, into the extruded tube while it is still viscoelastic. The PTFE powder represents 20% by weight (PTFE) with respect to the oil.
The friction coefficient between the internal surface of such a tube and a sheath made of HDPE (same commercial reference as above) is 0.075.
Everything else being equal, the PTFE powder and the silicone oil act synergistically in order to decrease the friction coefficient since:
- the friction coefficient obtained without treatment of the internal surface of the tube is 0.19; - the friction coefficient obtained with just silicone oil being sprayed is 0.102.
EXAMPLE 2:
An 8 mm cable is pushed by blowing, with a pig, into a 2400 m installation duct made of high-density polyethylene (HDPE), having an inside diameter of 26 mm and a thickness of 2.2 mm. In the first case, the inner surface of the installation duct is coated with the liquid lubricant (silicone oil) identified in Example 1. In the second case, the inner surface is coated with a solid lubricant powder identical to that in Example In the first case, it is not possible to install a length of cable exceeding 400 m, whereas in the second case it was possible to install lengths of cable ranging up to 700 m, all other things being equal.
- 7 EXAMPLE 3:
An installation duct, made of high-density polyethylene, having an inside diameter of 27 mm and a thickness of 3 mm, for an installed cable of 17.6 mm outside diameter, is used with the inner surface of the duct coated firstly with a silicone oil having a viscosity of 100 cP, secondly with a Teflon G powder having a particle size of 10 gm and thirdly with a mixture of powder in the aforementioned oil, with a level of 10% by weight of a powder with respect to the oil.
In the three cases, the friction coefficients measured during the pushing/ conveying of the cable are is 0.102, 0.071 and 0.0061, respectively.
EXAMPLE 4:
An installation duct made of high-density polyethylene, having an inside diameter of 27 mm and a thickness of 3 mm, for an installed cable of 17.6 mm outside diameter, is used with the inner surface of the duct coated with a lubricating mixture consisting of a liquid lubricant (silicone) having a viscosity of 100 cP and an increasing proportion by weight of a solid lubricant (Teflon 0 powder) having the same particle size as previously, namely 5, 10, 15 and 20% by weight, respectively.
In the above four cases, the friction coefficients measured during the blowing/conveying of the cable are 0.086, 0.085, 0.089 and 0.090, respectively.

Claims (8)

1. Elongate tubular product, having the same cross section over its entire longitudinal direction, comprising a solid tube (1) consisting of at least one plastic, which is both sufficiently flexible for it to be wound up and unwound and sufficiently rigid for it to withstand a centripetal or centrifugal radial force, the said solid tube having, on the inside and/or the outside, a surface layer (3), the free surface of which constitutes a friction surface, the said surface layer comprising a plastic matrix in which a lubricant is dispersed, characterized in that, synergistically, on the one hand, particles (4) of a solid-type lubricant are distributed in the plastic matrix, these particles being at least partly flush with the free surface of the surface layer, and, on the other hand, a liquid-type lubricant, compatible with the plastic matrix, is dispersed in the surface layer, virtually without wetting the free surface of the latter.
2. Tubular product according characterized in that the liquid silicone.
3. Tubular product according characterized in that the liquid lubricant has a viscosity of at most 1000 centistokes, at room temperature, and, for example, of between 10 and 1000 centistokes.
4. Tubular product according to Claim 1, characterized in that the particles (4) of the solid lubricant are microspheres having a diameter of at most gm, and preferably of between 1 and 15 gm.
5. Tubular product according to Claim 1, characterized in that the solid tube (1) consists of just the plastic matrix in which particles (4) of the dry lubricant are distributed, these particles being to Claim 1 ' lubricant is a to Claim 1 ' 9 partly flush with at least one, inner or outer, free surface (2) constituting a dry-friction surface.
6. Tubular product according to Claim 5, characterized in that the solid lubricant consists of a filler, the proportion of which is at least equal to 5 % by weight, and comprised between 5 and 20 % by weight of said matrix.
7. Tubular product according to Claim 5, characterized in that the liquid lubricant is essentially in the liquid state and is diffused into the plastic, virtually without wetting either the outer surface or the inner surface of the sci:ld mat.rix.
8. Tubular product according to Claim -7, characterized in that the liquid lubricant consists of an additive, the proportion of which is at least equal to 0.02% by weight of the plastic matrix, and especially between 0.02% and 0.08%' by weight of the said matrix.
_9. Tubular product according to Claim 81 characterized i ii that the solid lubricant/liquid lubricant proportion is at the utmost equal to 5%.
1
GB9919234A 1997-03-14 1998-03-13 Elongated tubular product, especially of the installation duct type Expired - Fee Related GB2337367B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9703372A FR2760814B1 (en) 1997-03-14 1997-03-14 EXTENDED TUBULAR PRODUCT, ESPECIALLY OF THE TYPE OF INSTALLATION DUCT
PCT/FR1998/000519 WO1998042052A1 (en) 1997-03-14 1998-03-13 Elongated tubular product, such as in particular an installation conduit

Publications (3)

Publication Number Publication Date
GB9919234D0 GB9919234D0 (en) 1999-10-20
GB2337367A true GB2337367A (en) 1999-11-17
GB2337367B GB2337367B (en) 2001-04-25

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Application Number Title Priority Date Filing Date
GB9919234A Expired - Fee Related GB2337367B (en) 1997-03-14 1998-03-13 Elongated tubular product, especially of the installation duct type

Country Status (24)

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JP (1) JP2001521604A (en)
KR (1) KR20000076210A (en)
AU (1) AU741152B2 (en)
BR (1) BR9806324A (en)
CH (1) CH693801A5 (en)
CZ (1) CZ251099A3 (en)
DE (1) DE19882152T1 (en)
EE (1) EE9900407A (en)
ES (1) ES2154612B1 (en)
FR (1) FR2760814B1 (en)
GB (1) GB2337367B (en)
HU (1) HUP0002341A3 (en)
ID (1) ID22695A (en)
LT (1) LT4659B (en)
LV (1) LV12425B (en)
NZ (1) NZ337348A (en)
PL (1) PL334903A1 (en)
RO (1) RO120440B1 (en)
RU (1) RU2189098C2 (en)
SI (1) SI20133A (en)
SK (1) SK283429B6 (en)
TR (1) TR199902238T2 (en)
UA (1) UA57069C2 (en)
WO (1) WO1998042052A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010017052U1 (en) * 2010-12-24 2012-04-03 Rehau Ag + Co. Pipe or pipe fitting
CN106133425A (en) * 2014-02-18 2016-11-16 株式会社索夫塞拉 The manufacture device of modifying inner surface pipe, the manufacture method of modifying inner surface pipe and modifying inner surface pipe
WO2018130254A1 (en) * 2017-01-13 2018-07-19 National Oilwell Varco Denmark I/S An unbonded flexible pipe

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
FR2795879B1 (en) * 1999-06-29 2001-10-12 Usinage Tubes Pour Electr ANNELE CONDUIT IN PRE-LUBRICATED SYNTHETIC MATERIAL, AND METHOD AND INSTALLATION FOR MAKING SAME
JP2002028984A (en) * 2000-07-13 2002-01-29 Tokai Rubber Ind Ltd Method for producing fuel transporting hose
FR2816388B1 (en) * 2000-11-07 2003-01-24 Novoplastic Sa ELONGATED TUBULAR PRODUCT, ESPECIALLY OF THE TYPE OF INSTALLATION DUCT
DE20201588U1 (en) * 2002-02-02 2003-03-13 Ccs Technology Inc Optical cable for insertion into pipe, has abrasion elements such as longitudinal knife-like members on surface of cable
FR2857461B1 (en) * 2003-07-08 2007-10-12 Acome Soc Coop Production LOW COEFFICIENT FRICTION MATERIAL AND TUBULAR PRODUCT EXTENDING THE COMPRISING MATERIAL
DE102005039482A1 (en) 2005-08-18 2007-02-22 CCS Technology, Inc., Wilmington Optical transmission element and method for producing an optical transmission element
RU2462801C1 (en) * 2011-05-18 2012-09-27 Государственное образовательное учреждение высшего профессионального образования "Поволжский государственный университет телекоммуникаций и информатики" (ГОУВПО ПГУТИ) Method of protecting optical cable from freezing water in protective polymer pipe and backup thereof in case of damage
KR101508656B1 (en) * 2014-08-29 2015-04-07 유옥수 The method of reducing the coefficient of friction for the inner cladding
KR101504692B1 (en) * 2014-08-29 2015-03-20 유옥수 The method of reducing the coefficient of friction for the inner cladding

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DE3539304A1 (en) * 1985-11-06 1987-05-07 Wavin Bv PLASTIC PIPE FOR RECEIVING
EP0326711A2 (en) * 1988-01-28 1989-08-09 REHAU AG + Co Polymeric piping
DE3830942A1 (en) * 1988-09-12 1990-03-15 Wavin Bv PLASTIC PIPE FOR RECEIVING, IN PARTICULAR CABLE PROTECTION PIPE
EP0414514A2 (en) * 1989-08-23 1991-02-27 Arnco Corporation Cable ducting and method for installing cables through ducts
WO1993014546A1 (en) * 1992-01-17 1993-07-22 Arnco Corporation Prelubricated duct

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FI89117C (en) 1992-01-21 1993-08-10 Tuomas Kerttunen Fixing chute for power lines

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Publication number Priority date Publication date Assignee Title
DE3539304A1 (en) * 1985-11-06 1987-05-07 Wavin Bv PLASTIC PIPE FOR RECEIVING
EP0326711A2 (en) * 1988-01-28 1989-08-09 REHAU AG + Co Polymeric piping
DE3830942A1 (en) * 1988-09-12 1990-03-15 Wavin Bv PLASTIC PIPE FOR RECEIVING, IN PARTICULAR CABLE PROTECTION PIPE
EP0414514A2 (en) * 1989-08-23 1991-02-27 Arnco Corporation Cable ducting and method for installing cables through ducts
WO1993014546A1 (en) * 1992-01-17 1993-07-22 Arnco Corporation Prelubricated duct

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010017052U1 (en) * 2010-12-24 2012-04-03 Rehau Ag + Co. Pipe or pipe fitting
CN106133425A (en) * 2014-02-18 2016-11-16 株式会社索夫塞拉 The manufacture device of modifying inner surface pipe, the manufacture method of modifying inner surface pipe and modifying inner surface pipe
EP3109533A4 (en) * 2014-02-18 2017-10-11 SofSera Corporation Inner face modified tube, inner face modified tube manufacturing method, and inner face modified tube manufacturing device
US10435777B2 (en) 2014-02-18 2019-10-08 Sofsera Corporation Inner surface-modified tube, inner surface-modified tube manufacturing method, and inner surface-modified tube manufacturing device
WO2018130254A1 (en) * 2017-01-13 2018-07-19 National Oilwell Varco Denmark I/S An unbonded flexible pipe
US11231132B2 (en) 2017-01-13 2022-01-25 National Oilwell Vareo Denmark I/S Unbonded flexible pipe

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Publication number Publication date
FR2760814B1 (en) 1999-04-23
ES2154612A1 (en) 2001-04-01
LV12425A (en) 2000-01-20
LV12425B (en) 2000-04-20
TR199902238T2 (en) 1999-12-21
SI20133A (en) 2000-06-30
HUP0002341A3 (en) 2001-12-28
PL334903A1 (en) 2000-03-27
RO120440B1 (en) 2006-01-30
HUP0002341A2 (en) 2000-11-28
LT99111A (en) 2000-01-25
GB9919234D0 (en) 1999-10-20
ID22695A (en) 1999-12-09
ES2154612B1 (en) 2001-10-16
BR9806324A (en) 2000-02-29
SK283429B6 (en) 2003-07-01
DE19882152T1 (en) 2000-04-27
SK121499A3 (en) 2000-08-14
CZ251099A3 (en) 1999-10-13
JP2001521604A (en) 2001-11-06
CH693801A5 (en) 2004-02-13
EE9900407A (en) 2000-04-17
LT4659B (en) 2000-05-25
AU6923498A (en) 1998-10-12
AU741152B2 (en) 2001-11-22
GB2337367B (en) 2001-04-25
KR20000076210A (en) 2000-12-26
NZ337348A (en) 2001-08-31
RU2189098C2 (en) 2002-09-10
FR2760814A1 (en) 1998-09-18
WO1998042052A1 (en) 1998-09-24
UA57069C2 (en) 2003-06-16

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