WO1983001288A1 - Method for thermally insulating fluid conduits embedded in the ground - Google Patents

Method for thermally insulating fluid conduits embedded in the ground Download PDF

Info

Publication number
WO1983001288A1
WO1983001288A1 PCT/CH1982/000108 CH8200108W WO8301288A1 WO 1983001288 A1 WO1983001288 A1 WO 1983001288A1 CH 8200108 W CH8200108 W CH 8200108W WO 8301288 A1 WO8301288 A1 WO 8301288A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
injection nozzle
foam
passages
pipes
Prior art date
Application number
PCT/CH1982/000108
Other languages
French (fr)
Inventor
B.V. Wellington
Original Assignee
Lazare, François
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 Lazare, François filed Critical Lazare, François
Publication of WO1983001288A1 publication Critical patent/WO1983001288A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/15—Arrangements for the insulation of pipes or pipe systems for underground pipes

Definitions

  • the present invention provides a method of thermal insulation of buried fluid lines. This process is simple to implement, can be expensive and provides more effective thermal insulation than that obtained with the previous processes.
  • Figures 1 to 3 of the drawing are sections of the excavation at different stages of the process.
  • a search 1 was carried out in the usual manner and a flexible sheet 2, waterproof and resistant to moisture was applied to the bottom and the side walls of the search.
  • the sheet material can be a common plastic material, for example, polyethylene or polyvinyl chloride (PVC). It is understood that the sheet 2 can be formed of several sections which are assembled and welded on site so as to form a continuous sheet extending along the excavation.
  • supports 3 On the sheet 2, supports 3 have been placed, then pipes to be insulated 4 on the supports 3. In this example, a supply pipe and a return pipe are provided for district heating, but there may be a single pipe or any number of pipes. 4 in excavation 1.
  • the supports 3 are rigid and have a cross section as small as is compatible with mechanical strength
  • SUBSTITUTE SHEET (' WIPO reguise, in order to minimize the conduction of heat along the supports. For the same purpose, we could give them a sinuous or helical shape.
  • the carriers 3 are preferably made of a plastic that '- remains rigid at the maximum temperature of the pipes 4, but may be of metal, although metals are less favorable from the thermal conductivity standpoint.
  • the supports 3 are dimensioned so as to support the pipes 4 approximately at equal distance from the bottom and the side walls of the excavation, and are arranged so as to maintain a sufficient spacing between the pipes.
  • the supports 3 are distributed along the excavation in as small a number as is compatible with the rigidity of the pipes 4. There is no need to take into account the weight of the water subsequently circulating in the pipes, because the latter will be supported by the rigid foam that will surround them.

Abstract

A digging (1) is lined with a sheet of plastic material (2). Supports (3) are arranged along the digging, then the conduits to be insulated (4). The edges of the sheet are sealed while reserving room for the inlet passages (5) of an injection nozzle, distributed along the digging. Through these passages is injected a liquid producing a foam (6) which sets into a rigid foam insulating and supporting the conduits. After complete filling, the digging is closed.

Description

- - - -
Procédé d'isolation thermique de conduites de fluide enterréesMethod of thermal insulation of buried fluid lines
Le problême de 1 ' isolation thermique des conduites de fluide enterrées, notamment des conduites d'eau pour le chauffage à distance, n'a pas trouvé jusqu'ici de so¬ lution satisfaisante sur le plan de l'efficacité et de l'économie.The problem of thermal insulation of buried fluid pipes, especially water pipes for district heating, has so far found no satisfactory solution in terms of efficiency and economy .
La présente invention offre un procédé d'isolation ther¬ mique de conduites de fluide enterrées. Ce procédé est de mise en oeuvre simple, peut coûteuse et procure une isolation thermique plus efficace que celle obtenue avec les procédés antérieurs.The present invention provides a method of thermal insulation of buried fluid lines. This process is simple to implement, can be expensive and provides more effective thermal insulation than that obtained with the previous processes.
Le procédé selon l'invention est défini dans la revendi¬ cation 1.The process according to the invention is defined in claim 1.
Un exemple de mise en oeuvre de ce procédé est illustré par les figures 1 à 3 du dessin, qui sont des coupes de la fouille à différents stades du procédé.An example of implementation of this process is illustrated by Figures 1 to 3 of the drawing, which are sections of the excavation at different stages of the process.
A la figure 1, une fouille 1 a été pratiquée de la maniè¬ re usuelle et une feuille 2 souple, étanche et résistan¬ te à l'humidité a été appliquée sur le fond et les parois latérales de la fouille. La matière de la feuille peut être une matière plastique courante, par exemple du poz lyëthylène ou du polychlorure de vinyle (PVC) . Il est entendu que la feuille 2 peut être formée de plusieurs tronçons que l'on assemble et soude sur place de manière à former une feuille continue s 'étendant le long de la fouille- Sur la feuille 2, on a posé des supports 3, puis des conduites à isoler 4 sur les supports 3. Dans cet exemple, on a prévu une conduite d'aller et une con¬ duite de retour pour le chauffage à distance, mais il peut y avoir une seule conduite ou un nombre quelconque de conduites 4 dans la fouille 1. Les supports 3 sont rigides et ont une section transversale aussi réduite que cela est compatible avec la résistance mécaniqueIn Figure 1, a search 1 was carried out in the usual manner and a flexible sheet 2, waterproof and resistant to moisture was applied to the bottom and the side walls of the search. The sheet material can be a common plastic material, for example, polyethylene or polyvinyl chloride (PVC). It is understood that the sheet 2 can be formed of several sections which are assembled and welded on site so as to form a continuous sheet extending along the excavation. On the sheet 2, supports 3 have been placed, then pipes to be insulated 4 on the supports 3. In this example, a supply pipe and a return pipe are provided for district heating, but there may be a single pipe or any number of pipes. 4 in excavation 1. The supports 3 are rigid and have a cross section as small as is compatible with mechanical strength
FEUILLE DE REMPLACEMENT (' OMPI reguise, afin de limiter au maximum la conduction de cha¬ leur le long des supports. Pour le même but, on pourrait leur donner une forme sinueuse ou hélicoïdale. Les supports 3 sont de préférence faits en une matière plastique qui '- reste rigide à la température maximum des conduites 4, mais ils peuvent être métalliques, bien que les métaux soient moins favorables du point de vue de la conductivite thermique.SUBSTITUTE SHEET (' WIPO reguise, in order to minimize the conduction of heat along the supports. For the same purpose, we could give them a sinuous or helical shape. The carriers 3 are preferably made of a plastic that '- remains rigid at the maximum temperature of the pipes 4, but may be of metal, although metals are less favorable from the thermal conductivity standpoint.
Les supports 3 sont dimensionnés de manière à soutenir les conduites 4 approximativement à égale distance du fond et des parois latérales de la fouille, et sont disposés de manière à maintenir un écartement suffisant entre les conduites . Les supports 3 sont répartis le long de la fouille en aussi petit nombre que cela est compatible avec la rigidité des conduites 4. Il n'y a pas lieu de tenir compte du poids de l'eau circulant ultérieurement dans les conduites, car ces dernières seront soutenues par la mousse rigide qui les entourera.The supports 3 are dimensioned so as to support the pipes 4 approximately at equal distance from the bottom and the side walls of the excavation, and are arranged so as to maintain a sufficient spacing between the pipes. The supports 3 are distributed along the excavation in as small a number as is compatible with the rigidity of the pipes 4. There is no need to take into account the weight of the water subsequently circulating in the pipes, because the latter will be supported by the rigid foam that will surround them.
A la figure 2, les bords de la feuille 2 ont été réunis et scellés, par exemple par soudure électrique ou au moyen de couches auto-collantes. De place en place, on a réservé des passages non scellés 5 juste assez longs pour permettre l'introduction d'une buse d'injection symbolisée par une flèche. Par cette buse, on injecte successivement dans les passages 5, répartis le long de la fouille à distance de quelques mètres, un liquide géné¬ rateur d'une mousse 6. Ce liquide peut avoir une composi¬ tion usuelle et telle qu'il produise une mousse rigide après durcissement. Un exemple de composition pour une mousse de polyuréthane est le suivant : "Voranate M 269" (prépolymère d'isocyanate vendu par Dow Chemical Co) 100 parties en poids "Voranol RH 360" (polyol vendu par DowIn FIG. 2, the edges of the sheet 2 have been joined and sealed, for example by electrical welding or by means of self-adhesive layers. From place to place, unsealed passages 5 have been reserved which are just long enough to allow the introduction of an injection nozzle symbolized by an arrow. By this nozzle, is successively injected into the passages 5, distributed along the excavation at a distance of a few meters, a liquid generating a foam 6. This liquid may have a usual composition and such that it produces rigid foam after hardening. An example of a composition for a polyurethane foam is as follows: "Voranate M 269" (isocyanate prepolymer sold by Dow Chemical Co) 100 parts by weight "Voranol RH 360" (polyol sold by Dow
Chemical Co) 100 r>arties en "Flugène 11" (trichlorofluoro ëthane vendu par Prochimie) 30 parties en poids "Desmorapid DB" (accélérateur aminé vendu par Bayer 1 partie en poids A la figure 3, la fouille a été refermée après son rem¬ plissage complet par la mousse et le durcissement de celle-ci. Les passages 5 de la figure 2 peuvent être scellés avant la fermeture de la fouille ou bien, comme représenté à la figure 3, certains d'entre eux peuvent être utilisés pour l'introduction d'une tubulure 7 ser¬ vant à la détection des fuites et éventuellement au drainage de celles-ci.Chemical Co) 100 r> arties en "Flugene 11" (trichlorofluoro ethane sold by Prochimie) 30 parts by weight "Desmorapid DB" (amino accelerator sold by Bayer 1 part by weight In Figure 3, the excavation was closed after its complete filling with foam and the passages 5 in FIG. 2 can be sealed before the closing of the excavation, or, as shown in FIG. 3, some of them can be used for the introduction of tubing 7 ser ¬ before detecting leaks and possibly draining them.
FEUILLE DE REMPLACEMENT REPLACEMENT SHEET

Claims

-k-REVENDICATIONS -k-CLAIMS
1. Procédé d'isolation thermique de conduites de fluide enterrées, caractérisé en ce que l'on applique une feuille souple, étanche et résistante à l'humidité contre la sur¬ face de la fouille destinée à recevoir une ou plusieurs conduites à isoler, en ce que l'on pose des supports sur la partie de la feuille recouvrant le fond de la fouille, ces supports étant conformés de manière à soutenir chaque conduite à distance de la feuille, en ce que l'on réunit les bords supérieurs de la feuille et les scellés en réservant des passages non scellés pour l'introduction d'une buse d'injection de liquide générateur de mousse de matière plastique rigides en ce que l'on introduit la buse d'injection successivement dans chaque passage et injecte par la buse une quantité de liquide générateur de mousse suffisante pour entourer la ou les conduites, en ce que l'on retire la buse d'injection, en ce qu'on laisse la mousse durcir et en ce que l'on ferme la fouille.1. A method of thermal insulation of buried fluid pipes, characterized in that a flexible, waterproof and moisture-resistant sheet is applied against the surface of the excavation intended to receive one or more pipes to be insulated, in that supports are placed on the part of the sheet covering the bottom of the excavation, these supports being shaped so as to support each pipe at a distance from the sheet, in that the upper edges of the sheet and sealed by reserving unsealed passages for the introduction of a rigid plastic foam generator injection nozzle in that the injection nozzle is introduced successively into each passage and injected by the nozzle a sufficient quantity of foam generating liquid to surround the pipe or pipes, in that the injection nozzle is removed, in that the foam is allowed to harden and in that the dig is closed.
2. Procédé selon la revendication 1, caractérisé en ce qu'après avoir injecté le liquide générateur de mousse et retiré la buse d'injection, on scelle tous les passages prévus pour la buse d'injection.2. Method according to claim 1, characterized in that after having injected the foam generating liquid and withdrawing the injection nozzle, all the passages provided for the injection nozzle are sealed.
3. Procédé selon le revendication 1, caractérisé en ce qu'après avoir injecté le liquide générateur de mousse et retiré la buse d'injection, on introduit une tubulure de détection de fuite dans au moins une partie des passa¬ ges et on scelle tous les passages, le cas échéant autour de la tubulure de détection.3. Method according to claim 1, characterized in that after having injected the foam-generating liquid and withdrawing the injection nozzle, a leak detection tube is introduced into at least part of the passages and all are sealed the passages, if necessary around the detection tubing.
FEUILLE DE REMPLACEMENT O PI REPLACEMENT SHEET O PI
PCT/CH1982/000108 1981-10-05 1982-10-05 Method for thermally insulating fluid conduits embedded in the ground WO1983001288A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6386/81-2811005 1981-10-05
CH638681A CH644437A5 (en) 1981-10-05 1981-10-05 Method for isolation buried pipe thermal fluid.

Publications (1)

Publication Number Publication Date
WO1983001288A1 true WO1983001288A1 (en) 1983-04-14

Family

ID=4308767

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1982/000108 WO1983001288A1 (en) 1981-10-05 1982-10-05 Method for thermally insulating fluid conduits embedded in the ground

Country Status (4)

Country Link
EP (1) EP0090816A1 (en)
CH (1) CH644437A5 (en)
NO (1) NO831885L (en)
WO (1) WO1983001288A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790544A (en) * 1983-12-19 1988-12-13 Raychem Gmbh Expansible seal

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227788A (en) * 1960-02-29 1966-01-04 Concrete Thermal Casings Inc Method of insulating a pipe assembly
US3380258A (en) * 1965-01-22 1968-04-30 Shell Oil Co Method of molding insulation about a metal pipe
US3484509A (en) * 1963-05-10 1969-12-16 Rensulate Corp Insulated underground conduit
US3563825A (en) * 1965-01-26 1971-02-16 Exxon Research Engineering Co Method for insulating pipelines wherein more insulating material is above the center line of the pipe than below the center line
FR2181022A1 (en) * 1972-04-20 1973-11-30 Nyby Bruk Ab

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227788A (en) * 1960-02-29 1966-01-04 Concrete Thermal Casings Inc Method of insulating a pipe assembly
US3484509A (en) * 1963-05-10 1969-12-16 Rensulate Corp Insulated underground conduit
US3380258A (en) * 1965-01-22 1968-04-30 Shell Oil Co Method of molding insulation about a metal pipe
US3563825A (en) * 1965-01-26 1971-02-16 Exxon Research Engineering Co Method for insulating pipelines wherein more insulating material is above the center line of the pipe than below the center line
FR2181022A1 (en) * 1972-04-20 1973-11-30 Nyby Bruk Ab

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790544A (en) * 1983-12-19 1988-12-13 Raychem Gmbh Expansible seal

Also Published As

Publication number Publication date
CH644437A5 (en) 1984-07-31
EP0090816A1 (en) 1983-10-12
NO831885L (en) 1983-05-27

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