AU741152B2 - Elongated tubular product, such as in particular an installation conduit - Google Patents

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

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Publication number
AU741152B2
AU741152B2 AU69234/98A AU6923498A AU741152B2 AU 741152 B2 AU741152 B2 AU 741152B2 AU 69234/98 A AU69234/98 A AU 69234/98A AU 6923498 A AU6923498 A AU 6923498A AU 741152 B2 AU741152 B2 AU 741152B2
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AU
Australia
Prior art keywords
lubricant
tubular product
product according
solid
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.)
Ceased
Application number
AU69234/98A
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AU6923498A (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 AU6923498A publication Critical patent/AU6923498A/en
Application granted granted Critical
Publication of AU741152B2 publication Critical patent/AU741152B2/en
Anticipated expiration legal-status Critical
Ceased 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)
  • Insulated Conductors (AREA)
  • Laminated Bodies (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)

Description

ELONGATED TUBULAR PRODUCT SUCH AS IN PARTICULAR AN INSTALLATION CONDUIT 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), 15 or else of information or signals (video transmission via optical cable, for example), or S•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.
o* 20 In this specification where a document, act or item of knowledge is referred to or discussed, this reference or discussion is not an admission that the document, act or item of knowledge or any combination thereof was at the priority date, publicly available, known to the public, part of the common general knowledge or known to be relevant to an attempt to solve any problem with which the specification is concerned.
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.
dxbm 10601527v 2 This lubrication is generally provided by a surfCac, layer on the inside -and/or outside of the tube, the f r surface of which constitutes a friction surf ace.
Various solutions have been proposed for this purpose.
According to document WO93/14546, 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, be a silicone-based 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: 35 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 he free surface of the latter; and 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 t-he 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, an 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 15 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 20 to the invention makes it possible to- eliminate, at least in part, the static charges generated by the f riction between the duct and the cable while the latter is being installed.
The present invention therefore has the 25 following secondary characteristics: the solid lubricant has a lamellar structure, and is, for example, graphite, or else has. a Dolymeric structure with oriented long straight chains, and is, ror example, a polytetrafluoroethvlene; the particles of the solid lubricant are microspheres having a diameter of at most 20 pm, and preferably of between.1 and 15 um; the liquid 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 um; the solid lubricant:-constitutes a filler; rZ-, 4 tne surface layer is irregular over the perimeter of the solid tybe and corresponds, for example, to longitudinal ribs or grooves; however, this same surface layer may be concinuous 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 15 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 25 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 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 ror 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.
P According to Figure i, an installation duct co sists 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 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 15 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.
;o 20 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 dxbm 10601527v1 6 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 polytecrafluoroethylene (PTFE) powder (commercial reference UNILUB T3 from the company Uniflon) having an-average particle size of 16 JPm, 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 1 5 commercial reference as above) is 0.075.
Everything else being equal, the PTFE oowder and the silicone oil act synergisticaily 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 S* silicone oil being sprayed is 0.102.
EXAMPLE 2 25 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 Examole 1.
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 ~u s u a l 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 tube 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 100Cp, secondly with a Teflon® powder having a particle size of pim and thirdly with a mixture of powder in the aforementioned oil, with a level of by weight of a powder with respect to the oil.
In the three cases, the friction coefficients measured during the pushing/conveying of the tube are 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 tube 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 15 proportion by weight of a solid lubricant (Teflon 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 Sblowing/conveying of the tube are 0.086, 0.085, 0.089 and 0.090 respectively.
The word 'comprising' or forms of the word 'comprising' as used in this description and in the claims do not limit the invention claimed to exclude any variants or additions.
*t 10601527v1

Claims (9)

1. Elongate tubular product, having the same cross section over its entire -longitudinal direction, 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, the said solid tube having, on the inside and/or the outside, a surface layer 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 of a solid-type lubricant 15 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 20 without wetting the free surface of the latter.
2. Tubular product according to Claim 1, **oo characterized in that the liquid lubricant is a silicone. S
3. Tubular product according to Claim 1, 25 characterized in that the liquid lubricant has a viscosity of at most 1000 centistokes, at room S temperature, and, for example, of between 10 and 1000 centistokes.
4. Tubular product according to Claim 1, characterized in that the particles of the solid lubricant are microspheres having a diameter of at most pm, and preferably of between 1 and 15 pm.
Tubular product according to Claim 1, characterized in that the solid tube consists of just the plastic matrix in which particles of the dry lubricant are distributed, these particles being 15 partly flush with at least one, inner or outer, free surface constituting a dry-friction surface.
6. Tubular product according to Claim characterized in that the solid lubricant consists of a filler, the proportion of which is at least eoual to 5 by weight, and comprised bet,.een 5 and 20 by weight of said matrix.
7. Tubular product according to Claim characterized in that the liquid lubricant is essentially in the liquid state and is diffused into the plastic, virtually w.ithout wetting either the outer surface or the inner surface of the said matrix.
8. Tubular product according to Claim 7, characterized in that the liquid lubricant consists of an additive, the proportion of which is at least eaual 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 8, characterized in that the sol-id lubricant/liquid lubricant proportion is at the utmost equal to Novoplastic 9 August 2001
AU69234/98A 1997-03-14 1998-03-13 Elongated tubular product, such as in particular an installation conduit Ceased AU741152B2 (en)

Applications Claiming Priority (3)

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
FR97/03372 1997-03-14
PCT/FR1998/000519 WO1998042052A1 (en) 1997-03-14 1998-03-13 Elongated tubular product, such as in particular an installation conduit

Publications (2)

Publication Number Publication Date
AU6923498A AU6923498A (en) 1998-10-12
AU741152B2 true AU741152B2 (en) 2001-11-22

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ID=9504986

Family Applications (1)

Application Number Title Priority Date Filing Date
AU69234/98A Ceased AU741152B2 (en) 1997-03-14 1998-03-13 Elongated tubular product, such as in particular an installation conduit

Country Status (24)

Country Link
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)

Families Citing this family (13)

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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., Wilmington, Del. 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
DE202010017052U1 (en) * 2010-12-24 2012-04-03 Rehau Ag + Co. Pipe or pipe fitting
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
CN106133425B (en) * 2014-02-18 2019-03-22 株式会社索夫塞拉 The manufacturing device of modifying inner surface pipe, the manufacturing method of modifying inner surface pipe and modifying inner surface pipe
KR101504692B1 (en) * 2014-08-29 2015-03-20 유옥수 The method of reducing the coefficient of friction for the inner cladding
KR101508656B1 (en) * 2014-08-29 2015-04-07 유옥수 The method of reducing the coefficient of friction for the inner cladding
WO2018130254A1 (en) * 2017-01-13 2018-07-19 National Oilwell Varco Denmark I/S An unbonded flexible pipe
CN118098688B (en) * 2024-04-28 2024-06-28 四川新东方电缆集团有限公司 Anti-bending aluminum alloy cable

Citations (3)

* Cited by examiner, † Cited by third party
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
WO1993014546A1 (en) * 1992-01-17 1993-07-22 Arnco Corporation Prelubricated duct

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Publication number Priority date Publication date Assignee Title
DE3830942A1 (en) * 1988-09-12 1990-03-15 Wavin Bv PLASTIC PIPE FOR RECEIVING, IN PARTICULAR CABLE PROTECTION PIPE
US5087153A (en) * 1989-08-23 1992-02-11 Arnco Corporation Internally spiraled duct and method of installation
FI89117C (en) 1992-01-21 1993-08-10 Tuomas Kerttunen Fixing chute for power lines

Patent Citations (3)

* Cited by examiner, † Cited by third party
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
WO1993014546A1 (en) * 1992-01-17 1993-07-22 Arnco Corporation Prelubricated duct

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Publication number Publication date
ES2154612B1 (en) 2001-10-16
SI20133A (en) 2000-06-30
GB2337367B (en) 2001-04-25
CZ251099A3 (en) 1999-10-13
ID22695A (en) 1999-12-09
RU2189098C2 (en) 2002-09-10
ES2154612A1 (en) 2001-04-01
KR20000076210A (en) 2000-12-26
DE19882152T1 (en) 2000-04-27
LV12425B (en) 2000-04-20
SK283429B6 (en) 2003-07-01
FR2760814B1 (en) 1999-04-23
LT4659B (en) 2000-05-25
WO1998042052A1 (en) 1998-09-24
HUP0002341A2 (en) 2000-11-28
LV12425A (en) 2000-01-20
PL334903A1 (en) 2000-03-27
SK121499A3 (en) 2000-08-14
TR199902238T2 (en) 1999-12-21
BR9806324A (en) 2000-02-29
EE9900407A (en) 2000-04-17
JP2001521604A (en) 2001-11-06
LT99111A (en) 2000-01-25
RO120440B1 (en) 2006-01-30
GB2337367A (en) 1999-11-17
FR2760814A1 (en) 1998-09-18
CH693801A5 (en) 2004-02-13
AU6923498A (en) 1998-10-12
HUP0002341A3 (en) 2001-12-28
NZ337348A (en) 2001-08-31
GB9919234D0 (en) 1999-10-20
UA57069C2 (en) 2003-06-16

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