WO2011061704A1 - Procédé d'isolation de joints de tuyaux - Google Patents

Procédé d'isolation de joints de tuyaux Download PDF

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Publication number
WO2011061704A1
WO2011061704A1 PCT/IB2010/055261 IB2010055261W WO2011061704A1 WO 2011061704 A1 WO2011061704 A1 WO 2011061704A1 IB 2010055261 W IB2010055261 W IB 2010055261W WO 2011061704 A1 WO2011061704 A1 WO 2011061704A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
pipe joint
pipe
mold assembly
sealing medium
Prior art date
Application number
PCT/IB2010/055261
Other languages
English (en)
Inventor
Jorge Nelson Barroso Carreno
Original Assignee
Technoresin Cc
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 Technoresin Cc filed Critical Technoresin Cc
Publication of WO2011061704A1 publication Critical patent/WO2011061704A1/fr

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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
    • 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

Definitions

  • THIS invention relates to a method of insulating pipe joints, and more particularly but not exclusively, to a method of protecting pipe joints against corrosion.
  • a layer of a substance known as petrolatum is typically applied around the pipe joint.
  • the petrolatum mastic is packed about the coupling and a wrap of petrolatum tape is applied to the petrolatum mastic to keep it in place.
  • a final wrap of PVC or PE self adhesive tape is then applied over the petrolatum tape, or alternatively a loose PE bag is circumferentially spread around the protected joint area. All this is done after the connected pipe has already been placed inside the pipe trench.
  • the integrity of the application is also not always consistent, as it is largely dependent on the skill of the person applying the grease layer.
  • the seal is applied once the pipe has already been positioned in the pipe trench, and the work therefore has to be done in a confined space, and it is also very difficult to inspect the packing to see if it has been done correctly.
  • the petrolatum system also offers very little mechanical protection, and if there is foot traffic over the ridge of the protected joint the petrolatum layer can be easily displaced. Also, if backfilling of the trench is not carefully controlled, the petrolatum may be displaced, rendering the protection ineffective. It will be appreciated that the quality and integrity of the seal obtained using the petrolatum system is very dependent on the specific individual applying the seal, and it is therefore difficult to obtain consistency.
  • a method of insulating a pipe joint including the steps of:
  • the method to include the step of inducing a pressure less than atmospheric pressure inside the enclosed volume.
  • sealing medium to be injected into the enclosed volume.
  • the sealing medium is in the form of an epoxy or a PU thermosetting resin.
  • the sealing medium is also provided for the sealing medium to be in the form of settable foam, more preferably a polyurethane (PU) foam.
  • the method may include the steps of allowing the sealing medium to cure.
  • the method may also include the step of applying a heat shrink layer around the cured sealing medium, alternatively around the mold encapsulating the liquid sealing medium, in order to form a secondary environmental seal around the pipe joint.
  • a mold assembly for use in insulating a pipe joint, the mold assembly including: a mold body configured and dimensioned to be locatable about the perimeter of the pipe joint to be sealed, and to be at least partially spaced apart from a surface of the pipe when installed;
  • a mold assembly for use in insulating a pipe joint, the mold assembly including: an operatively lower mold configured and dimensioned to fit around a lower halve of the pipe joint;
  • an operatively upper mold configured and dimensioned to fit around an upper halve of the pipe joint
  • the lower mold and the upper mold including complementary engagement formations that enables the molds to be locatable on top of one another.
  • Figure 1 is a perspective view of an operatively upper mold of the mold assembly used in the method of insulating a pipe joint in accordance with a first embodiment of the invention
  • Figure 2 is a perspective view of an operatively lower mold of the mold assembly used in the method of insulating a pipe joint in accordance with a first embodiment of the invention
  • Figure 3 is a perspective view of the mold assembly mounted on a pipe joint to be insulated in accordance with a first embodiment of the invention
  • Figure 4 is a cross-sectional side view of a pipe joint and the mold assembly in accordance with a first embodiment of the invention.
  • Figure 5 is a cross-sectional side view of a pipe joint and a mold assembly of a second embodiment of the invention.
  • FIG. 10 a non-limiting example of a mold assembly in accordance with a first embodiment of the invention is generally indicated by reference numeral 10.
  • the mold assembly 10 includes an operatively upper mold 20 and an operatively lower mold 30, which are used to construct the mold assembly 10, which is used in a novel method of insulating a pipe joint 15 against corrosion.
  • a typical pipe joint 15 is schematically shown in Figure 4, and comprises a first pipe end 15.1 and a second pipe end 15.2 that are located end to end, and subsequently secured to one another using a bolted pipe clamp 15.3. Once the pipe ends 15.1 , 15.2 have been secured to one another a corrosion seal is applied to the pipe joint using the mold assembly 10.
  • the mold assembly 10 includes an operatively upper mold 20 and an operatively lower mold.
  • the upper mold 20 includes a shell 21 made of a thin polymeric material, and which is configured and dimensioned to fit around the pipe clamp 15.3, with allowance being made for bolts (not shown) extending from the pipe clamp 15.3.
  • Longitudinal flanges 22 extend from opposite sides of the shell, and are profiled to match the curve of an outer surface of the pipe ends. This enables a partial seal to be formed between the mold 20 and the pipe end, and prevent the sealing medium from leaking from the mold assembly at the interface between the mold and the pipe.
  • a circumferential flange 23 furthermore extends radially outwardly from the shell 21 , and includes an engagement formation 24, in the form of a groove formation, for receiving an engagement formation 34, in the form of a tongue formation, that extends from a complementary flange 33 extending from the operatively lower mold 30.
  • a casting aperture 25 is provided in an upper surface of the upper mold 30 for use in introducing a sealing medium 40 into the mold assembly 10.
  • the lower mold 30 also includes a shell 31 made of a thin polymeric material, and which is configured and dimensioned to fit around the pipe clamp 15.3, with allowance again being made for bolts (not shown) extending from the pipe clamp 15.3.
  • Longitudinal flanges 32 extend from opposite sides of the shell, and are profiled to match the curve of an outer surface of the pipe ends.
  • the longitudinal flanges 32 of the lower mold 30 and the longitudinal flanges 22 of the upper mold 20 are aligned so as to form a substantially continuous annular flange when viewed from the side.
  • the lower mold 30 also includes an outwardly extending flange 33, having a tongue formation 34 standing proud thereof for engaging the groove formation 24 provided in the flange 23 of the upper mold.
  • the two halves 20, 30 are located over the pipe joint 15 and aligned in order for the outwardly extending flanges 23, 33 to abut.
  • These flanges may now be secured to one another in various different ways to form the mold assembly 10.
  • the composite mold assembly 10 now defines an enclosed volume between the outer surface of the pipe ends 15.1 , 15.2 and pipe clamp 15.3, and an inner surface of the shells 21 , 31 of the molds 20, 30.
  • a sealing medium 40 is subsequently introduced into the enclosed volume through the casting aperture 25 in the upper mold 20.
  • the sealing medium may be settable, expanding foam which is poured into the mold assembly, and which is then left to cure. Once the foam is fully expanded and cured, the mold assembly may be removed, but it is also foreseen that the mold assembly can be left in position on order to protect the foam.
  • the foam and/or the mold assembly surrounding the foam may finally also be shrink wrapped by way of a heat shrink process so as to enhance the integrity of the seal.
  • a liquid or gel may be used as a sealing medium. In this case the sealing medium will not cure, and the mold assembly 10 will have to remain in place to contain the sealing medium.
  • the common denominator resides in the sealing medium being applied using a mold assembly which ensures uniform distribution and adequate support of the sealing medium.
  • the seal formed will be of a high integrity, as the person creating the seal only needs to pour the sealing medium into the mold assembly.
  • the seal will also be of higher mechanical integrity, and will not easily be dislodged or damaged.
  • the seal will also be formed in a substantially reduced time period, as the process in inherently less time-consuming.
  • a second embodiment of the mold assembly in accordance with the invention is generally indicated by reference numeral 100, and is schematically shown in Figure 5.
  • the method is particularly suitable for use on welded joints, although it will be appreciated that the method, and thus the mold assembly used in this method, is not limited to welded joints. It should be noted that this embodiement is only schematically illustrated in Figure 5, and that the actual mold assembly can take many different forms.
  • a sturdy sheet 101 of about 200mm was wrapped about the area to be insulated, with a 3 to 5mm gap 102 being left between an inner surface of the sheet and the outer surface of the pipe.
  • Seals 104 were provided at the edges of the sheet 101 thus resulting in a circumferential annular channel being formed between the pipe and the sheet 101.
  • the spacing and seal between the sheet 101 and the pipe 103 was achieved by applying a self-adhesive foam or rubber strip having a thickness of between 3 and 5mm to the mould, but it will be appreciated that spacing ridges may also be integrally extruded with the sheet.
  • a first port 105 and a second port 106 were also provided, both being in flow communication with the enclosed volume formed by the mold assembly 100.
  • a release agent was furthermore applied to an inner surface of the sheer 101 , but it will be appreciated that the selection of a self releasing material for the manufacturing of the sheet would also have sufficed.
  • the first port 05 was subsequently connected to a vacuum pump, whereas the second port 106 was brought in flow communication with a resin source.
  • the vacuum pump therefor induces a vacuum inside the enclosed volume, causing the resin to be drawn into the enclosed volume. It was found that this process resulted in the formation of a seal that was substantially free of bubbles, which is essential for the particular application. It is believed that the results will be even better if the resin is introduced under pressure using an injection apparatus.
  • the seal formed will be of a high integrity, as the person creating the seal only needs to install the mold assembly, and no particular application skill is required.
  • the seal will also be of higher mechanical integrity than existing painted or sprayed seals, and will not easily be dislodged or damaged. Increased seal thickness (3 - 5mm as opposed to 1.5mm with painted or sprayed seals) is also achievable.
  • the seal will also be formed in a substantially reduced time period, as the process in inherently less time-consuming. The process will furthermore take place in an enclosed mould, with will reduce environmental impacts on the applications and formation of the seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)

Abstract

La présente invention concerne un procédé d'isolation de joints de tuyaux, et plus particulièrement, mais non exclusivement, un procédé de protection anticorrosion des joints de tuyaux. Ce procédé comporte les étapes consistant: à prendre un ensemble moule configuré et dimensionné pour s'adapter autour du joint de tuyaux; à placer l'ensemble moule sur le joint de tuyaux de façon à former entre le moule et une surface extérieure du tuyau un volume fermé; et à introduire un agent d'étanchéité dans le volume fermé de façon à former une zone isolée.
PCT/IB2010/055261 2009-11-18 2010-11-18 Procédé d'isolation de joints de tuyaux WO2011061704A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200908135 2009-11-18
ZA2009/08135 2009-11-18

Publications (1)

Publication Number Publication Date
WO2011061704A1 true WO2011061704A1 (fr) 2011-05-26

Family

ID=44059264

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/055261 WO2011061704A1 (fr) 2009-11-18 2010-11-18 Procédé d'isolation de joints de tuyaux

Country Status (2)

Country Link
WO (1) WO2011061704A1 (fr)
ZA (1) ZA201008270B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2516981A (en) * 2013-08-09 2015-02-11 Pipeline Induction Heat Ltd Mould equipment for pipeline section coating and methods for coating of pipeline sections with moulds
DE102014100296A1 (de) * 2014-01-13 2015-07-16 Witzenmann Gmbh Flexibles Leitungselement mit Isolierung
US9488303B2 (en) 2014-03-10 2016-11-08 Saint-Gobain Performance Plastics Corporation Pipe coupling
EP3670998A1 (fr) * 2018-12-18 2020-06-24 Nexans Accouplement pour conduites de fluide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258512A (en) * 1963-05-09 1966-06-28 Archibald T Flower Method of applying a rigid unicellular polyurethane foam coating to pipe fittings
US4323526A (en) * 1980-06-02 1982-04-06 Rubco Products, Inc. Method for sealing pipe joints
US6257282B1 (en) * 1998-10-28 2001-07-10 Mve, Inc. Vacuum insulated pipe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3258512A (en) * 1963-05-09 1966-06-28 Archibald T Flower Method of applying a rigid unicellular polyurethane foam coating to pipe fittings
US4323526A (en) * 1980-06-02 1982-04-06 Rubco Products, Inc. Method for sealing pipe joints
US6257282B1 (en) * 1998-10-28 2001-07-10 Mve, Inc. Vacuum insulated pipe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2516981A (en) * 2013-08-09 2015-02-11 Pipeline Induction Heat Ltd Mould equipment for pipeline section coating and methods for coating of pipeline sections with moulds
DE102014100296A1 (de) * 2014-01-13 2015-07-16 Witzenmann Gmbh Flexibles Leitungselement mit Isolierung
US9488303B2 (en) 2014-03-10 2016-11-08 Saint-Gobain Performance Plastics Corporation Pipe coupling
EP3670998A1 (fr) * 2018-12-18 2020-06-24 Nexans Accouplement pour conduites de fluide
US11339912B2 (en) 2018-12-18 2022-05-24 Nexans Coupling for fluid-conducting lines

Also Published As

Publication number Publication date
ZA201008270B (en) 2011-10-26

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