US3266820A - Assembly device for welded metal tubes - Google Patents

Assembly device for welded metal tubes Download PDF

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Publication number
US3266820A
US3266820A US375253A US37525364A US3266820A US 3266820 A US3266820 A US 3266820A US 375253 A US375253 A US 375253A US 37525364 A US37525364 A US 37525364A US 3266820 A US3266820 A US 3266820A
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US
United States
Prior art keywords
sleeve
pipes
asbestos
pipe
weld
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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.)
Expired - Lifetime
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US375253A
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English (en)
Inventor
Leborgne Michel Henri Fernand
Guinvarc H Pierre
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Valeo SE
Original Assignee
Francaise du Ferodo SA
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Application filed by Francaise du Ferodo SA filed Critical Francaise du Ferodo SA
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    • 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
    • F16L13/00—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints
    • F16L13/02—Welded joints
    • F16L13/0254—Welded joints the pipes having an internal or external coating
    • F16L13/0263—Welded joints the pipes having an internal or external coating having an internal coating

Definitions

  • the present invention has for its object the provision of a welded-pipe joint assembly covered internally with a protective coating having a low melting point, and comprising an internal sleeve arranged at the welding point, adapted to resist the heat developed during welding, this assembly being free from the drawbacks indicated above and permitting perfect protection to be obtained with a simple and convenient assembly.
  • the protective layer with a low melting point is eliminated at the point of welding land the sleeve is substituted for it.
  • the inner surface of the sl'eeve is directly exposed t0 the ow of fluid in the pipe and is of substantially the same diameter as the internal surface of the protective coating so as to ensure continuity of connection in the interior of the pipe.
  • the sleeve is also provided with a base of asbestos.
  • the sleeve In addition to the heat-resisting properties which are cha-racteristic of asbestos and which have in this case a particular advantage, this enables the sleeve to be given substantial elasticity which, according to one of the aspects of the invention, is combined with a longitudinal slot in the sleeve, so that the latter can conveniently be put into close contact with the bare inner wall of the pipe, in spiteof the tolerances of manufacture of the pipes.
  • the ared portion need be provided only at one extremity of the pipe, or the flaring may even be dispensed with entirely.
  • the pipes may thus be provided with one straight male end of the other with a female collet or llare, or alternatively both ends straight and placed end to end.
  • Means are preferably provided for covering the slot in the sleeve. They consist, for example, of a small tongue.
  • the sleeve of a material compris- 3,266,82@ Patented August 16, 1966 ing asbestos gives the sleeve qualities of absorption which are put to advantage by causing the sleeve itself to play the part of an anti-corrosion agent in a moist medium so as to protect the bare internal surface of the pipes over which the sleeve extends.
  • the sleeve comprises, in addition to asbestos, a chemically basic material.
  • the liquid between the sleeve and the inner -surface of the pipes which is the same liquid that flows in the pipes and which is located by the actual presence of the sleeve in a position protected from the main iiow in the pipe, has thus a basic pH value which prevents the corrosion of this surface in a very effective manner.
  • An arrangement of this kind has the additional advantage of making unnecessary any extensive precautions in isolating the above-mentioned medium from the llow in the pipe in an absolutely fluid-tight manner.
  • the sleeve is of material having a base of asbestos liber with a silica precipitate partly converted to anhydrous silica distributed throughout the asbestos, while in an alternative form, it is ofv asbestos cement.
  • the sleeve with the base of asbestos may be slit and may not be chemically basic, or again it may not be slit and may be chemically basic.
  • the sleeve may be of asbestos cement and associated with pipes provided with a are at each extremity. It should however be observed that the sleeve is advantageously provided, according to the invention, with a slit and is chemically basic.
  • FIG. 1 is a view in longitudinal cross-section of two Welded pipes comprising the internal coupling sleeve;
  • FIG. 2 is a corresponding view in transverse section, taken along the line II-II of FIG. l;
  • FIG. 3 shows the sleeve alone in transverse section, that is to say before it is assembled in the pipe;
  • VFIGS. 4. 5, 6 and 7 are views similar to FIG. 1, but relating to various alternative forms respectively;
  • FIGS. 8 and 9 are views in transverse section of tWo alternative forms of sleeve respectively;
  • FIG. 10 shows in elevation a further alternative form of sleeve
  • FIG. 1l is a view similar to that of FIG. l, but showing still another alternative form.
  • Two pipes of steel 1t) ⁇ and 11 which are to be assembled comprise in one case a straight male end 12 and in the second case a flared portion or female collet 13, in which th'e end 12 is adapted to be fitted with a suitable play.
  • Each lof the pipes 1t) and 11 is provided internally over its free portion with a protective coating 14 of a material having a low melting point, for example of bitumen or the like, protecting the pipe against rust or corrosion.
  • the end 12 and the liared portion 13 do not have any coating 14%.
  • a sleeve 15 of appropriate heat-resisting and non-oxidizable material In the end 12 is engaged a sleeve 15 of appropriate heat-resisting and non-oxidizable material.
  • the sleeve 15 is such that its inner wall 16 which is directly exposed to the liow in the pipe is substantially in line with the extension from the inner wall 17 of the coatings 14 which cover the pipes 10 and 11.
  • the sleeve 15 is of such a length that its center is substantially opposite the extremity of the flared portion 13.
  • the pipes 10 and 11 are assembled together by a weld 18 applied between the extremity of the ared portion 3 13 and the male end 12.
  • the weld 1S is not liable to damage the readily melted coatings 14, which are at a sufficient distance and which also are not liable to affect adversely the mechanical strength of the sleeve 15,V
  • the sleeve y15 is such that it can easily slide inside the male extremity 12 for the purposes of assembly.
  • the sleeve 15 is driven in until it comes against the extreme edge 19 of the coating 14 of the pipe 10 and, after the assembly of the pipes has been completed, comes into abutment at 20 against the coating 14 of the other pipe 11.
  • the sleeve can be put in position either at the factory or on the site of emplacement of the pipes. When the sleeve 15 is put into place at the factory, the feature that it is completely engaged in the pipe 10 protects it against any damage during handling and transport.
  • this latter is to some extent elastic and is slit at 21 along one of its generator lines.
  • the sleeve 15 is provided with a tongue 22 which covers the slit 21 and ensures continuity of the protection.
  • FIG. 3 There can be seen from FIG. 3 the position of the sleeve 15 in the free condition, with the slit 21 widely opened. Irrespective of the tolerances of manufacture of the pipes, the diameter of the sleeve 15 can be reduced in order to insert the latter conveniently (FIG. 2) in the end portion 12, the sleeve coming elastically into close contact with the internal wall of this end portion. Before assembly of the sleeve 15 in the end portion 12, a sealing product may be applied, if so desired, along the whole length of the tongue 22.
  • the sleeve 15 is preferably made of hardened asbestos cardboard of the type in which the material with a base of asbestos fiber has distributed throughout its mass a precipitate of silica, partly converted to anhydrous silica.
  • the sleeve 15 is preferably manufactured on forms having a larger diameter than the internal diameter of the pipe, so that by the spring effect (see FIGS. 2 and 3) it is correctly applied against the whole of the inner surface of the pipe.
  • the base cardboard employed is preferably an ordinary asbestos cardboard containing about 6% of organic material. It has an apparent density of the order of l. It is employed in varying thicknesses as a function of the diameter of the sleeves to be produced. In the current diameters comprised between 100 mm. and 200 mm., a cardboard of 1.5 mm. is suitable.
  • a strip of cardboard having a width equal to the length of the sleeve is cut-out to a length equal to the internal circumference of the pipe increased by about 10 mm. This strip is moistened with water on the extremity at which the tongue 22 will be made and is then deformed so as to produce the tongue 22.
  • the strip After drying in air, the strip is placed between two pieces of wire mesh forming a pocket. It is impregnated with a solution of sodium silicate.
  • the strip is left to dry in its basket of wire mesh until the surface is no longer sticky, for example for about one hour in a normal atmosphere.
  • the sheet which has remained moist in the interior is bent around a tube and is then fixed by its two extremities on a jacketed metal tube. A notch in the jacketing provides a housing for the tongue 22.
  • This assembly is dried in an oven for one and a half hours at 120 C., after which the sleeve has acquired its nal shape.
  • the sleeve is removed from the former, soaked in a 10% solution of ammonium CII chloride and then dried at ordinary temperature and baked in a stove for one hour at C.
  • the sleeve 15 thus formed has properties of heat resistance, non-oxidation, elasticity and absorption, and ⁇ is chemically basic.
  • the liquid at 23 between the sleeve 15 and the inner surface of the extremity 12, and which is protected by the actual presence of the sleeve 15 from the main flow in the pipe has a basic pH value which prevents the corrosion kof this surface.
  • FIG. 4 in which the arrangement is similar to that which has just been described with reference to FIGS. 1 to 3, but in which the flared portion or tulip 13 is provided considerably shorter for the purpose of reducing weight.
  • the sleeve 15 is provided in two portions 15a and 15b, inserted respectively into the two pipes. It will be noted that, as in the previous case, the weld 18 is substantially arranged in the centre of the assembly 15a-15b.
  • the pipes 10 and 11 may also be both provided with straight extremities.
  • the tulip 13 is thus eliminated and, in the example shown in FIG. 5, is replaced by a coupling ring 13'. This latter is passed during assembly over the two pipes brought close together, and is then welded by its ends at 18 on the said pipes.
  • the two pipes 10 and 11 which also have straight extremities are welded together end to end at 18.
  • the sleeve 15, in two parts 15a and 15b, is mounted astride the weld 18, as previously.
  • the weld 18 of the two pipes is effected at the place where the two half-sleeves 15a and 15b are juxtaposed.
  • the two half-sleeves 15a and 15b can be placed in position either at the factory or on the site of emplacement of the pipes.
  • the sleeve 15 could be in one piece, if so required (see FIG. 7) which would in practice involve its being placed in position on the site.
  • FIGS. 8 and 9 in which the overlapping of the slot 21 of the sleeve 15 is effected without formation of the tongue 22, simply by means of a spiral winding at 24.
  • This arrangement which results in a superposition of thicknesses, for example over a considerable fraction of the circumference (FIG. 8) or even over one or several turns (FIG. 9), is in practice possible only if the material has in itself a sufficiently small thickness.
  • materials such as those which have been previously described, in silicated asbestos cardboard, it has
  • Such thicknesses are perfectly suitable for the spiral arrangement shown in FIG. 8 or in FIG. 9. It will be observed that the sleeves such as those shown in FIGS. 8 and 9 have considerable elasticity which enables them to be easily mounted in the pipes and which subsequently ensures a good application in the pipes.
  • the sleeve 15 is formed by a strip wound in the form of a helix with adjacent turns 25. These turns could furthermore be made overlapping.
  • the sleeve 15 could also be formed by two or more interleaved helices, with or without overlap. Sleeves could also be made in two or more coaxial layers, each formed in the manner indicated above. The winding of one layer will preferably be effected in the opposite direction to that of an adjacent layer in order to cross the turns.
  • the sleeve 15 is made of asbestos cement and the pipes 10 and 11 are provided with tulips 26 and 27-13 in order to receive it.
  • a welded pipe joint assembly comprising a pair of metal pipes having a welded joint between them, a protective layer of material having a low melting point within the pipes, and an internal asbestos sleeve disposed at the zone of the Weld and adapted to resist the heat developed during the welding operation, said protective layer being eliminated at the zone of the Weld and being replaced by said sleeve, the inner surface of the sleeve being exposed to the iiow of uid in said pipes and having substantially the same diameter as the inner surface of said protective layer, whereby the asbestos sleeve operates to render noncorrosive the liquid between the said sleeve and said pipes and the continuity of the internal surface of the joint is preserved.
  • a device as claimed in claim 1 in which the extremities of both said pipes are straight and are welded together end to end.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
US375253A 1963-06-20 1964-06-15 Assembly device for welded metal tubes Expired - Lifetime US3266820A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR938727A FR1368296A (fr) 1963-06-20 1963-06-20 Dispositif d'assemblage de tuyaux métalliques soudés

Publications (1)

Publication Number Publication Date
US3266820A true US3266820A (en) 1966-08-16

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ID=8806477

Family Applications (1)

Application Number Title Priority Date Filing Date
US375253A Expired - Lifetime US3266820A (en) 1963-06-20 1964-06-15 Assembly device for welded metal tubes

Country Status (6)

Country Link
US (1) US3266820A (fr)
DE (1) DE1260896B (fr)
FR (1) FR1368296A (fr)
GB (1) GB1070952A (fr)
NL (1) NL6407048A (fr)
OA (1) OA00188A (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359626A (en) * 1965-04-21 1967-12-26 Du Pont Process for joining glass-lined metal conduits
US3453004A (en) * 1967-11-24 1969-07-01 Schlumberger Technology Corp Apparatus for welding internally-coated tubular members
US3508766A (en) * 1968-10-25 1970-04-28 American Mach & Foundry Welded joint for pipe having internal coating
US3516690A (en) * 1966-03-16 1970-06-23 Galen W Kreig Welded coupling construction with bonded liner
US3724877A (en) * 1971-07-16 1973-04-03 Carborundum Co Swivel joint assembly
US3940048A (en) * 1975-01-21 1976-02-24 Minnesota Mining And Manufacturing Company Device for backing butt-welds between tubes
US6164904A (en) * 1998-08-07 2000-12-26 United Technologies Corporation Assembly for brazing a stator component of a gas turbine engine and method brazing articles such as an abradable material to a stator of a gas turbine engine
FR2852610A1 (fr) * 2003-03-17 2004-09-24 Air Liquide Procede de protection contre la corrosion a haute temperature
WO2004082824A1 (fr) * 2003-03-17 2004-09-30 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de protection d'equipements contre la corrosion a haute temperature
US10267440B2 (en) * 2015-08-26 2019-04-23 Hdr, Inc. Apparatus and method for strengthening welded-lap joints for steel pipeline
US12246400B2 (en) 2017-09-04 2025-03-11 Lps Ip Llc Pipeline system of pipe sections with pre-assembled insulating weld backing rings and method of making same
US12253192B2 (en) 2020-08-05 2025-03-18 Lps Ip, Llc Sealed pipeline connection, pipeline sleeve, and lockable pipeline seals and method of making same
US12270492B2 (en) 2020-08-05 2025-04-08 Lps Ip, Llc Sealed pipeline connection and raised pipeline sleeve, and method of making same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2434330A1 (fr) * 1978-08-25 1980-03-21 Ato Chimie Conduites pour ecoulements diphasiques
JPS5821093A (ja) * 1981-07-29 1983-02-07 川崎重工業株式会社 耐蝕二重管
GB9009860D0 (en) * 1990-05-02 1990-06-27 Du Pont Canada Joining of metallic pipe lined with thermoplastic polymer
GB9503679D0 (en) * 1995-02-23 1995-04-12 British Gas Plc Joining lined pipes
GB2298256B (en) * 1995-02-23 1998-03-18 British Gas Plc Joining lined pipe items

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1987341A (en) * 1931-07-15 1935-01-08 Youngstown Sheet And Tube Co Method of making pipe joints
US2188925A (en) * 1939-02-24 1940-02-06 Ronay Bela Welding joint and chill ring therefor
US2308607A (en) * 1941-09-04 1943-01-19 William M Jackson Exhaust pipe guard
US2362505A (en) * 1940-12-27 1944-11-14 Lincoln Electric Co Welding
US2472523A (en) * 1945-05-24 1949-06-07 John J Dillon Backing or chill ring
FR988197A (fr) * 1948-06-19 1951-08-23 Plaatwellerij Nv De Joint soudé pour tuyaux ou tubes

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE160981C (fr) *
AT88773B (de) * 1919-07-02 1922-06-10 August Ing Umlauf Rohrdichtung.
GB242094A (en) * 1924-11-26 1925-11-05 Bromford Ltd Improvements in joints for wrought metal tubes
DE642206C (de) * 1932-08-28 1937-02-25 Mannesmann Ag Schweissrohrverbindung mit Innenauskleidung
DE660158C (de) * 1934-12-07 1938-05-19 Roehrenwerke Akt Ges Deutsche Verfahren und Vorrichtung zum Innenauskleiden von geschweissten Rohrverbindungen aufder Baustelle
FR795605A (fr) * 1935-07-17 1936-03-18 Vallourec Joint de tuyauterie
DE723659C (de) * 1938-12-23 1942-08-07 Mannesmann Ag Schweissrohrverbindung
DE829390C (de) * 1949-04-26 1952-01-24 Dr Franz Rinagl Rohrverbindung
FR992388A (fr) * 1949-08-10 1951-10-17 Bataafsche Petroleum Procédé de confection des joints de tuyaux
US2893758A (en) * 1954-10-13 1959-07-07 Raymond J Dufour Fireless welded tie-in coupling for gas mains
GB824717A (en) * 1956-11-15 1959-12-02 Hubert Salmen Improvements in hollow equipment with corrosion-resistant linings
FR1199181A (fr) * 1958-07-07 1959-12-11 Lorraine Escaut Sa Raccordement anti-corrosion de tubes soudés bout à bout

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1987341A (en) * 1931-07-15 1935-01-08 Youngstown Sheet And Tube Co Method of making pipe joints
US2188925A (en) * 1939-02-24 1940-02-06 Ronay Bela Welding joint and chill ring therefor
US2362505A (en) * 1940-12-27 1944-11-14 Lincoln Electric Co Welding
US2308607A (en) * 1941-09-04 1943-01-19 William M Jackson Exhaust pipe guard
US2472523A (en) * 1945-05-24 1949-06-07 John J Dillon Backing or chill ring
FR988197A (fr) * 1948-06-19 1951-08-23 Plaatwellerij Nv De Joint soudé pour tuyaux ou tubes

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359626A (en) * 1965-04-21 1967-12-26 Du Pont Process for joining glass-lined metal conduits
US3516690A (en) * 1966-03-16 1970-06-23 Galen W Kreig Welded coupling construction with bonded liner
US3453004A (en) * 1967-11-24 1969-07-01 Schlumberger Technology Corp Apparatus for welding internally-coated tubular members
US3508766A (en) * 1968-10-25 1970-04-28 American Mach & Foundry Welded joint for pipe having internal coating
US3724877A (en) * 1971-07-16 1973-04-03 Carborundum Co Swivel joint assembly
US3940048A (en) * 1975-01-21 1976-02-24 Minnesota Mining And Manufacturing Company Device for backing butt-welds between tubes
FR2298403A1 (fr) * 1975-01-21 1976-08-20 Minnesota Mining & Mfg Dispositif de support pour le soudage de tubes bout a bout
US6164904A (en) * 1998-08-07 2000-12-26 United Technologies Corporation Assembly for brazing a stator component of a gas turbine engine and method brazing articles such as an abradable material to a stator of a gas turbine engine
FR2852610A1 (fr) * 2003-03-17 2004-09-24 Air Liquide Procede de protection contre la corrosion a haute temperature
WO2004082824A1 (fr) * 2003-03-17 2004-09-30 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de protection d'equipements contre la corrosion a haute temperature
US20050173495A1 (en) * 2003-03-17 2005-08-11 Sophie Wastiaux Method of protecting against corrosion at high temperature
US7543733B2 (en) * 2003-03-17 2009-06-09 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Method of protecting against corrosion at high temperature
US10267440B2 (en) * 2015-08-26 2019-04-23 Hdr, Inc. Apparatus and method for strengthening welded-lap joints for steel pipeline
US10975990B2 (en) 2015-08-26 2021-04-13 Hdr, Inc. Apparatus and method for strengthening welded-lap joints for steel pipeline
US12246400B2 (en) 2017-09-04 2025-03-11 Lps Ip Llc Pipeline system of pipe sections with pre-assembled insulating weld backing rings and method of making same
US12253192B2 (en) 2020-08-05 2025-03-18 Lps Ip, Llc Sealed pipeline connection, pipeline sleeve, and lockable pipeline seals and method of making same
US12270492B2 (en) 2020-08-05 2025-04-08 Lps Ip, Llc Sealed pipeline connection and raised pipeline sleeve, and method of making same

Also Published As

Publication number Publication date
GB1070952A (en) 1967-06-07
NL6407048A (fr) 1964-12-21
DE1260896B (de) 1968-02-08
FR1368296A (fr) 1964-07-31
OA00188A (fr) 1966-03-15

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