WO1991015701A1 - A method for achieving a cable conduit - Google Patents

A method for achieving a cable conduit Download PDF

Info

Publication number
WO1991015701A1
WO1991015701A1 PCT/FI1991/000101 FI9100101W WO9115701A1 WO 1991015701 A1 WO1991015701 A1 WO 1991015701A1 FI 9100101 W FI9100101 W FI 9100101W WO 9115701 A1 WO9115701 A1 WO 9115701A1
Authority
WO
WIPO (PCT)
Prior art keywords
hose
insulating layer
pipe
flow pipe
pipe element
Prior art date
Application number
PCT/FI1991/000101
Other languages
French (fr)
Inventor
Stefan Lindvall
Original Assignee
Oy Muotekno Ab
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 Oy Muotekno Ab filed Critical Oy Muotekno Ab
Publication of WO1991015701A1 publication Critical patent/WO1991015701A1/en

Links

Classifications

    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1228—Joining preformed parts by the expanding material
    • B29C44/1242—Joining preformed parts by the expanding material the preformed parts being concentric
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
    • B29C33/50—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible
    • B29C33/505—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible cores or mandrels, e.g. inflatable
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/143—Pre-insulated pipes

Definitions

  • the present invention relates to a method for achieving a cable conduit into a hard foamed plastic insulating layer of a preinsulated pipe element, right in the vicinity of a flow pipe of the pipe element, which pipe element has a protective casing surrounding the insulating layer.
  • preinsulated pipe elements having a conduit for a cable
  • said conduit has been achieved by casting a longitudinal metallic or plastic profile inside an insulating layer, through which a heat or leakage alarm cable is drawn.
  • a heat or leakage alarm cable is drawn.
  • Such a solution is relatively well suited to heat cables, but especially in connection with leakage alarm cables, said solution is in no way applicable.
  • the alarm cable is fully insulated in said profile and cannot detect any leakages coming from the inside or the outside.
  • the object of the present invention is to eliminate this problem, which has been achieved by means of a solution characterized in that before feeding and foaming an insulating layer into a space between a flow pipe and a protective casing, a releasing-agent coated, pressurized longitudinal elastic hose is fixed outside the flow pipe, which hose is maintained at an elevated temperature during foaming and cooled rapidly after the foamed insulating material has set, whereby the plastic hose contracts and can be easily removed.
  • preinsulated pipe elemets are made as follows. Outside a flow pipe 1 is removably fastened a longitudinal, releasing-agent coated elastic hose 5, such as a plastic hose, which is closed at its one end and fastened at its other end to a pressure- air source, such as a compressor.
  • the flow pipe 1 and the hose 5 fastened thereto are threaded inside a protective casing 2, in which they are kept in position by spacer rings.
  • the ends of the pipe element are closed with end pieces, after which an insulating material 3 mixed with a foaming agent is fed into a space between the flow pipe 1 and the protective casing 2, whereby the heat released during the foaming process heats the pressurized hose 5, which as a result further expands.
  • the pressure of the hose 5 is reduced and the hose 5 is cooled rapidly, whereby it contracts and can be easily removed from the pipe element.
  • a cable conduit 4 is obtained, which is especially suited to a heat cable and a leakage alarm cable, since the wall of the cable conduit 4 comprises a foamed insulating material.
  • the pipe element may comprise a socketed or non-socketed straight pipe, pipe bend, branch piece, contraction piece or the like.
  • the flow pipe 1 can be made of plastic or metal
  • the insulating layer 3 may consist of polyurethane or other foamed plastic
  • the protective casing 2 can be made of plastic or metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Insulation (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The present invention relates to a method for achieving a cable conduit (4) into a hard foamed plastic insulating layer (3) of a preinsulated pipe element, right in the vicinity of a flow pipe (1) of the pipe element, which pipe element has a protective casing (2) surrounding the insulating layer (3). The invention is characterized in that before feeding and foaming the insulating layer (3) into a space between the flow pipe (1) and the protective casing (2), a releasing-agent coated, pressurized longitudinal elastic hose (5) is fixed outside the flow pipe (1), which hose is maintained at an elevated temperature during foaming and cooled rapidly after the foamed insulating material (3) has set, whereby the hose contracts and can be easily removed.

Description

A method for achieving a cable conduit
The present invention relates to a method for achieving a cable conduit into a hard foamed plastic insulating layer of a preinsulated pipe element, right in the vicinity of a flow pipe of the pipe element, which pipe element has a protective casing surrounding the insulating layer.
In previously known preinsulated pipe elements having a conduit for a cable, said conduit has been achieved by casting a longitudinal metallic or plastic profile inside an insulating layer, through which a heat or leakage alarm cable is drawn. Such a solution is relatively well suited to heat cables, but especially in connection with leakage alarm cables, said solution is in no way applicable. The alarm cable is fully insulated in said profile and cannot detect any leakages coming from the inside or the outside.
The object of the present invention is to eliminate this problem, which has been achieved by means of a solution characterized in that before feeding and foaming an insulating layer into a space between a flow pipe and a protective casing, a releasing-agent coated, pressurized longitudinal elastic hose is fixed outside the flow pipe, which hose is maintained at an elevated temperature during foaming and cooled rapidly after the foamed insulating material has set, whereby the plastic hose contracts and can be easily removed.
In this way, a cable conduit is obtained, which is primarily in a direct contact with the outer surface of the flow pipe so that it can immediately detect a potential leakage.
The invention is next described in more detail with reference to the accompanying drawing, which shows as an example of how the cable conduit is drawn through a preinsulated pipe bend.
In accordance with this invention, preinsulated pipe elemets are made as follows. Outside a flow pipe 1 is removably fastened a longitudinal, releasing-agent coated elastic hose 5, such as a plastic hose, which is closed at its one end and fastened at its other end to a pressure- air source, such as a compressor. The flow pipe 1 and the hose 5 fastened thereto are threaded inside a protective casing 2, in which they are kept in position by spacer rings. The ends of the pipe element are closed with end pieces, after which an insulating material 3 mixed with a foaming agent is fed into a space between the flow pipe 1 and the protective casing 2, whereby the heat released during the foaming process heats the pressurized hose 5, which as a result further expands. After the foamed insulating material 3 has set, the pressure of the hose 5 is reduced and the hose 5 is cooled rapidly, whereby it contracts and can be easily removed from the pipe element. In this way, a cable conduit 4 is obtained, which is especially suited to a heat cable and a leakage alarm cable, since the wall of the cable conduit 4 comprises a foamed insulating material.
The pipe element may comprise a socketed or non-socketed straight pipe, pipe bend, branch piece, contraction piece or the like. The flow pipe 1 can be made of plastic or metal, the insulating layer 3 may consist of polyurethane or other foamed plastic, and the protective casing 2 can be made of plastic or metal.

Claims

Claims :
1. A method for achieving a cable conduit (4) into a hard foamed plastic insulating layer (3) of a preinsulated pipe element, right in the vicinity of a flow pipe (1) of the pipe element, which pipe element has a protective casing (2) surrounding the insulating layer (3), c h a r a c t e ¬ r i z e d in that before feeding and foaming the insulating layer (3) into a space between the flow pipe (1) and the protective casing (2), a releasing-agent coated, pressurized longitudinal elastic hose (5) is fixed outside the flow pipe (1), which hose is maintained at an elevated temperature during foaming and cooled rapidly after the foamed insulating material (3) has set, whereby the hose (5) contracts and can be easily removed.
PCT/FI1991/000101 1990-04-09 1991-04-05 A method for achieving a cable conduit WO1991015701A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI901785A FI87902C (en) 1990-04-09 1990-04-09 Method for providing a cable channel
FI901785 1990-04-09

Publications (1)

Publication Number Publication Date
WO1991015701A1 true WO1991015701A1 (en) 1991-10-17

Family

ID=8530241

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000101 WO1991015701A1 (en) 1990-04-09 1991-04-05 A method for achieving a cable conduit

Country Status (2)

Country Link
FI (1) FI87902C (en)
WO (1) WO1991015701A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2746695A1 (en) * 1996-03-29 1997-10-03 Valeo Climatisation METHOD OF MANUFACTURING A VEHICLE DASHBOARD, WITH INTEGRATED AIR DUCTS, AND DASHBOARD THUS OBTAINED
NL1012057C2 (en) * 1999-05-12 2000-11-14 Pipelife Nederland Bv Protected plastic pipe.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3400737A (en) * 1966-07-07 1968-09-10 Moore & Co Samuel Composite tubing product and apparatus for manufacturing the same
DE2233865A1 (en) * 1972-07-10 1974-01-24 Reimer Horstmann PIPE SYSTEM FOR THE TRANSPORTATION OF WATER OR OTHER MEDIA, WITH INTEGRATED CIRCULATION PIPE
EP0352943A2 (en) * 1988-07-25 1990-01-31 Minnesota Mining And Manufacturing Company Method for producing a sheet member containing at least one enclosed channel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3400737A (en) * 1966-07-07 1968-09-10 Moore & Co Samuel Composite tubing product and apparatus for manufacturing the same
DE2233865A1 (en) * 1972-07-10 1974-01-24 Reimer Horstmann PIPE SYSTEM FOR THE TRANSPORTATION OF WATER OR OTHER MEDIA, WITH INTEGRATED CIRCULATION PIPE
EP0352943A2 (en) * 1988-07-25 1990-01-31 Minnesota Mining And Manufacturing Company Method for producing a sheet member containing at least one enclosed channel

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2746695A1 (en) * 1996-03-29 1997-10-03 Valeo Climatisation METHOD OF MANUFACTURING A VEHICLE DASHBOARD, WITH INTEGRATED AIR DUCTS, AND DASHBOARD THUS OBTAINED
WO1997036730A1 (en) * 1996-03-29 1997-10-09 Valeo Climatisation Method for making a motor vehicle dashboard with built-in air ducts, and resulting dashboard
US6071591A (en) * 1996-03-29 2000-06-06 Valeo Climatisation Method for making a motor vehicle dashboard with built-in air ducts, and resulting dashboard
ES2151373A1 (en) * 1996-03-29 2000-12-16 Valeo Climatisation Method for making a motor vehicle dashboard with built-in air ducts, and resulting dashboard
CN1079721C (en) * 1996-03-29 2002-02-27 瓦莱奥空调公司 Method for making motor vehicle dashboard with built-in air ducts, and resulting dashboard
DE19780320B3 (en) * 1996-03-29 2015-02-26 Valeo Climatisation Method for producing a dashboard for motor vehicles with incorporated air ducts, and thus produced dashboard
NL1012057C2 (en) * 1999-05-12 2000-11-14 Pipelife Nederland Bv Protected plastic pipe.
WO2000070255A1 (en) * 1999-05-12 2000-11-23 Pipelife Nederland B.V. Protected plastic pipe

Also Published As

Publication number Publication date
FI901785A (en) 1991-10-10
FI901785A0 (en) 1990-04-09
FI87902C (en) 1993-03-10
FI87902B (en) 1992-11-30

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