GB2237613A - An improved coaxial pipe system - Google Patents

An improved coaxial pipe system Download PDF

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Publication number
GB2237613A
GB2237613A GB8924726A GB8924726A GB2237613A GB 2237613 A GB2237613 A GB 2237613A GB 8924726 A GB8924726 A GB 8924726A GB 8924726 A GB8924726 A GB 8924726A GB 2237613 A GB2237613 A GB 2237613A
Authority
GB
United Kingdom
Prior art keywords
pipe
coaxial
pipe system
inter
pipes
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.)
Withdrawn
Application number
GB8924726A
Other versions
GB8924726D0 (en
Inventor
Hugh Mackay Shaw
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.)
Sellafield Ltd
Original Assignee
British Nuclear Fuels PLC
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 British Nuclear Fuels PLC filed Critical British Nuclear Fuels PLC
Priority to GB8924726A priority Critical patent/GB2237613A/en
Publication of GB8924726D0 publication Critical patent/GB8924726D0/en
Priority to JP11401090U priority patent/JPH0369779U/ja
Priority to FR9013523A priority patent/FR2653852A1/en
Priority to DE9015089U priority patent/DE9015089U1/de
Publication of GB2237613A publication Critical patent/GB2237613A/en
Withdrawn legal-status Critical Current

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
    • F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
    • F16L39/005—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for concentric pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits

Landscapes

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

Abstract

In a coaxial pipe system, in which thermal expansion or contraction is accommodated by inter-pipe anchors connected at the ends of straight pipe runs, each anchor comprises integral inner and outer coaxial cylindrical members 1, 2 with an apertured disc therebetween to permit drainage. <IMAGE>

Description

An Improved Coaxial Pipe System The present invention concerns a coaxial pipe system.
In brief, the invention adopts the conventional concept of a pipe within a pipe, which can be used to provide secondary containment for hazardous fluids, to long runs of coaxial pipes having temperature differences between the inner and outer pipes.
Thermal expansion and contraction is accommodated by axial compression and tension in straight lengths and not by bending as in conventional pipe runs. To achieve self-equilibrium of the axial pipe forces inter-pipe anchors and spacers are employed.
According to the present invention a coaxial pipe system incorporates an inter-pipe anchor, adapted for connection to the ends of coaxial pipes, the anchor comprising integral inner and outer coaxial cylindrical members with an apertured disc therebetween to permit drainage.
In a preferred embodiment the inner cylindrical member has a wall thickness greater than that of the pipes to which it is to be connected as by welding. Further the length of the inner cylindrical member is greater than that of the outer cylindrical member.
The invention will be described further, by way of example, with reference to the accompanying drawings; in which: Figures 1 and 2 are respectively a section and end view of an inter-pipe anchor; and Figure 3 shows a part of a coaxial pipe system incorporating such inter-pipe anchors.
With reference to Figures 1 and 2, an inter-pipe anchor comprises integral inner and outer cylinders 1 and 2 with an apertured disc 3 therebetween. The disc 3 is formed with a plurality of apertures 4 therethrough at equi-spaced angular positions. The disc 3 is located at approximately the mid-length positions of the cylinders 1 and 2. The length of the cylinder 1 is greater than the length of the cylinder 2. Preferably, and as shown, the wall thickness of the inner cylinder is greater over a major portion of its length than at the ends thereof. The ends 5 are preferably chamfered for welding to pipe lengths.
Figure 3 shows the inter-pipe anchors welded to the ends of a coaxial pipe bend comprising inner and outer pipes 6 and 7 respectively. To assemble the pipe system, the inner pipe 6 is first welded to the inner cylinder 1 of the low inter-pipe anchor 8. The outer pipe 7 is then fitted over the inner pipe 6 and welded to the outer cylinder 2 of the lower inter-pipe anchor 8. The lengths of the pipes 6 and 7 are such that the opposite end of the inner pipe 6 projects beyond the end of the outer pipe 7.
This allows the upper inter-pipe anchor 9 to be connected to the protruding end of the inner pipe 6. Thereafter the end of the outer pipe 7 is joined to the outer cylinder of the upper inter-pipe anchor 9 by an extension pipe length 10.
In addition to the above a completed coaxial pipe system can also include external anchors for securing the pipes fixedly in position of use. ~ Spiders can be mounted at spaced positions along the inner pipe 6 to support the outer pipe 7. Means can be provided for interconnecting different diameter pipe lines and finally means can be provided to close or plug the annular gap between the pipes 6 and 7 at the ends of the pipe runs.
The outer pipe 7 can serve as secondary containment.
The apertures 4 in the discs 3 of the inter-pipe anchors permit drainage to a low point in the event of leakage from the inner pipe 6. In addition to secondary containment the outer pipe 7 can provide insulation or permit heating or cooling by the use of liquids or gases in the annular region between the coaxial pipes.
The inter-pipe anchors allow for thermal expansion in pipes of any length without change of direction to absorb movements, the use of loops or the use of expansion devices such as expansion joints, swivel joints, ball joints and flexible hoses. The system when assembled is substantially maintenance free. Thermal expansion, or contraction, is accommodated by axial compression and tension in the pipe lengths and inter-pipe anchors rather than by bending as in conventional pipe systems.

Claims (5)

Claims
1. A coaxial pipe system comprising an inter-pipe anchor adapted for connection to the ends of coaxial pipes, the anchor having integral inner and outer coaxial cylindrical members with an apertured disc therebetween to permit drainage.
2. A coaxial pipe system according to claim 1 in which the inner member has a wall thickness over a major portion of its length greater than that of the pipes to be connected thereto.
3. A coaxial pipe system according to claim 1 in which the length of the inner cylindrical member is greater than the length of the outer cylindrical member.
4. A coaxial pipe system according to claim 1 in which the ends of the members are chamfered for welding to pipe lengths.
5. A coaxial pipe system substantially as herein described with reference to and as illustrated in the accompanying drawings.
GB8924726A 1989-11-02 1989-11-02 An improved coaxial pipe system Withdrawn GB2237613A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB8924726A GB2237613A (en) 1989-11-02 1989-11-02 An improved coaxial pipe system
JP11401090U JPH0369779U (en) 1989-11-02 1990-10-30
FR9013523A FR2653852A1 (en) 1989-11-02 1990-10-31 COAXIAL PIPE SYSTEM.
DE9015089U DE9015089U1 (en) 1989-11-02 1990-11-02

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8924726A GB2237613A (en) 1989-11-02 1989-11-02 An improved coaxial pipe system

Publications (2)

Publication Number Publication Date
GB8924726D0 GB8924726D0 (en) 1989-12-20
GB2237613A true GB2237613A (en) 1991-05-08

Family

ID=10665596

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8924726A Withdrawn GB2237613A (en) 1989-11-02 1989-11-02 An improved coaxial pipe system

Country Status (4)

Country Link
JP (1) JPH0369779U (en)
DE (1) DE9015089U1 (en)
FR (1) FR2653852A1 (en)
GB (1) GB2237613A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5452922A (en) * 1993-07-09 1995-09-26 Christopher G. Ziu Elbow fittings with expanded outer annulus space for double-containment assemblies
US5494318A (en) * 1993-04-29 1996-02-27 Butts; Nicholas E. Secondary containment system
NL1022411C2 (en) * 2003-01-16 2004-07-19 Cox Geelen Bv Coaxial pipe arrangement for e.g. heating installations, has inner and outer pipes connected via coupling part also used to join adjacent arrangements together

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5085471A (en) * 1991-04-04 1992-02-04 Double Containment Systems Double containment pipe joint assembly
GB2261042A (en) * 1991-11-01 1993-05-05 Guest John D Improvements in or relating to tube couplings for co-axial tubing
DE4202079C2 (en) * 1992-01-25 1998-04-02 Audi Ag Exhaust system for internal combustion engines
IT243274Y1 (en) * 1997-03-18 2002-03-04 L N Di Natalini Lino & C Srl FITTING FOR CONCENTRIC PIPES, FORMED BY TWO COAXIAL ELBOWS
AU2004229037B2 (en) * 2003-11-20 2010-05-20 Itp Pipeline for the transportation of liquefied natural gas

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054035A (en) *
GB716771A (en) * 1952-08-18 1954-10-13 Kromschroeder Ag G Improvements relating to fittings for pipe lines
GB773050A (en) * 1954-11-13 1957-04-17 Kromschroeder Ag G Pipe connection for a throughflow appliance such as a gas meter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB835017A (en) * 1955-06-23 1960-05-18 Andre Huet Improvements in methods of connecting groups of concentric tubes
DE2205483A1 (en) * 1972-02-05 1973-08-16 Guethlein Stelling Geb Stellin WELDING FLANGE FOR HEATED OR COOLED DOUBLE COAT PIPES
FR2341094A1 (en) * 1976-02-16 1977-09-09 Pichon Michel Flange for welding to double walled pipe - has chamfered inner and outer joints staggered for easy access
DE3105406A1 (en) * 1981-02-14 1982-09-02 Hergen 3100 Celle Sandl Conical self-sealing inner-pipe socket connection, and a centring device for double pipes (double-pipe systems)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054035A (en) *
GB716771A (en) * 1952-08-18 1954-10-13 Kromschroeder Ag G Improvements relating to fittings for pipe lines
GB773050A (en) * 1954-11-13 1957-04-17 Kromschroeder Ag G Pipe connection for a throughflow appliance such as a gas meter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5494318A (en) * 1993-04-29 1996-02-27 Butts; Nicholas E. Secondary containment system
US5452922A (en) * 1993-07-09 1995-09-26 Christopher G. Ziu Elbow fittings with expanded outer annulus space for double-containment assemblies
NL1022411C2 (en) * 2003-01-16 2004-07-19 Cox Geelen Bv Coaxial pipe arrangement for e.g. heating installations, has inner and outer pipes connected via coupling part also used to join adjacent arrangements together

Also Published As

Publication number Publication date
GB8924726D0 (en) 1989-12-20
JPH0369779U (en) 1991-07-11
DE9015089U1 (en) 1991-01-17
FR2653852A1 (en) 1991-05-03

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)