US3823883A - Apparatus for wrapping pipe with multiple strips - Google Patents

Apparatus for wrapping pipe with multiple strips Download PDF

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Publication number
US3823883A
US3823883A US00227995A US22799572A US3823883A US 3823883 A US3823883 A US 3823883A US 00227995 A US00227995 A US 00227995A US 22799572 A US22799572 A US 22799572A US 3823883 A US3823883 A US 3823883A
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US
United States
Prior art keywords
pipe
strapping
wrapping
multiple strips
dummy
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.)
Expired - Lifetime
Application number
US00227995A
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English (en)
Inventor
V Fencl
A Roze
E Naureckas
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.)
Grotnes Machine Works Inc
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Grotnes Machine Works Inc
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Filing date
Publication date
Application filed by Grotnes Machine Works Inc filed Critical Grotnes Machine Works Inc
Priority to US00227995A priority Critical patent/US3823883A/en
Priority to JP47047772A priority patent/JPS4897116A/ja
Priority to DE2237423A priority patent/DE2237423A1/de
Priority to CA163,122A priority patent/CA981652A/en
Application granted granted Critical
Publication of US3823883A publication Critical patent/US3823883A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F16L9/00—Rigid pipes
    • F16L9/02—Rigid pipes of metal
    • F16L9/04—Reinforced pipes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00—Cutting
    • Y10S83/924—Work wrapped or coated around a core, not part of the machine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49874—Prestressing rod, filament or strand
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5176—Plural diverse manufacturing apparatus including means for metal shaping or assembling including machining means
    • Y10T29/5177—Plural diverse manufacturing apparatus including means for metal shaping or assembling including machining means and work-holder for assembly
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53313—Means to interrelatedly feed plural work parts from plural sources without manual intervention
    • Y10T29/53348—Running-length work
    • Y10T29/53352—Means including orbiting running-length work supply

Definitions

  • ABSTRACT A method and apparatus for wrapping pipe, of the type used in gaspipe lines for example, with multiple strips of metal strapping.
  • the pipe is mounted on a pair of chucks which fit into the open ends of the pipe to rotate the pipewhile multiple spools of metal strapping are moved axially along the pipe.
  • the ends of the multiple strips of strapping are initially clamped to a dummy mandrel having the same outside diameter as the pipe, and this mandrel is rotated along with the pipe so that the multiple strips of strapping are wound helically around the mandrel and the pipe as the spools of strapping are traversed along the length of the pipe.
  • the wrapping of the multiple strips of strapping is continued on to a second dummy mandrel having the same outside.
  • the chucks which hold and rotate the pipe comprise expanding mandrels for expanding the pipe and the wrapping outwardly against the clamping ring so that the wrapping is clamped firmly between the I clamping ring and the pipe at both ends of the pipe.
  • the present invention relates generally to the fabrication of high strength composite pipe of the type that has a basic solid core pipe wrapped with a high strength wrapping material.
  • Pipe that is wrapped with a high strength material such as metal strapping or wire provides both technical and economic advantages in terms of higher resistance tiple strips of strapping to be wound on the pipe simultaneously.
  • a further object of the invention is to provide an improved method and apparatus of the foregoing type that automatically clamps the strapping to the pipe.
  • Yet another object of the invention is to provide such an improved method and apparatus that continues the wrapping beyond the ends of the pipe, and automatically cuts the strapping flush with the ends of the pipe.
  • a still further object of the invention is to provide apparatus of the typedescribed above that is of rugged construction and efficient to operate.
  • FIG. 1 is a perspective view of a pipe wrapping machine embodying the invention, with a pipe inserted in the machine to be wrapped;
  • FIG. 2 is a sectiontaken along line 22 .in FlG. 1;
  • FIG. 3 is-a section taken along line 3-3 in FIG. 1, with a portion of strapping carriage broken away to show the internal structure;
  • FIG. 4 is a section taken along line 44'in FIG. 1, I
  • FIG. 5 is an enlarged perspective of that portion of the machine of FIG. 1 where the pipe wrapping is initiated and showing the beginning of a-wrapping and the end portion of apipe inserted in the machine to be wrapped;
  • FIG. 6 is an enlarged fragmentary section taken through the pipe and its wrapping while in the machine ofFIG. 1; I
  • FIG. 7' is an enlarged perspective of the axially movable head assembly of the machine of FIG. 1, with portions thereof shown in a more advanced position in bro- I
  • FIG. 7' is an enlarged perspective of the axially movable head assembly of the machine of FIG. 1, with portions thereof shown in a more advanced position in bro- I
  • FIG. 1 there is shown a pipe wrapping apparatus adapted to hold a pipe 10 to be wrapped in a horizontal position between a stationary head assembly 11 and a horizontally movable head assembly 12.
  • the two head assemblies 11 and 12 carry a pair of chucks in the form of expanding mandrels 13 and 14, respectively,-
  • the head 12 is mounted for longitudinal movement on a bed 15 for longitudinal movement in the direction of the axis of the pipe 10.
  • the power means for advancing and retracting the movable head 12 relative to the stationary head 11 is illustrated as a hydraulic cylinder'16, but it will be understood that any conventional power means may be used for this purpose.
  • the expanding mandrels l3 and 14 are also conventional and may, for example, be of the type described in U.S. Pat. No. 3,583,200 to Cvijanovic.
  • the pipe wrapping machine includes a carriage mounted for axial movement along the pipe 10, and carrying a plurality of rotatable spools of metal strapping.
  • the strapping is withdrawn from the spools by rotation of the pipe while the strapping carriage is simulpair of track members 21 and 22 extending parallel to each other and to the pipe 10.
  • a pair of spaced rollers 23 and 24 journaled on the outboard side of the carriage ride on the upper and lower surfaces, respec-' tively, of thetrack member 22, while a third roller25 journaled on the inboard side of the carriage 20 rides on the top surface of the track member 21.
  • a power-driven screw 26 is threaded through a projection 27 on the bottom of the carriage 20.
  • the driven system for turning the screw 26 is contained within the stationary head assembly 11, and includes a motor 17- driving the screw 26 via a speed re- I I ducer 18'(FIG. 2).
  • the metal strapping to be wrapped around the pipe is contained in four spools 28, 29, 30, and 31 rotatably mounted on one side of the carriage 20. These four spools are staggered with respect to one another in the direction of. the axis of the pipe 10 so that the ad jacent strips of strapping 28a, 29a, 30a, and 31a withdrawn from the spools only partially overlap each other.
  • the four overlapping strips of strapping are passed through the nips of a pair of guide rollers 32 and 33, and are withdrawn from the four spools by rotation of the pipe 10 and the dummy mandrels'associated therewith (to be described below),
  • the pipe 10 is rotated by rotation of the mandrel 13 which in turn is rotated by a conventional drive motor mounted within the head assembly 11. More specifically, the mandrel 13 is rotated by the same drive motor 17 that drives the carriage-traversing screw 26; as shown in FIG. 2, the motor 17 is connected to the mandrel 13 via a clutch and brake assembly 34 to permit the mandrel 13 to be disconnected from the motor 17 during the return traverse of the carriage 20.
  • the use of the common motor '17 provides the desired synchronization of the carriage movement with rotation of the pipe 10.
  • the four spools 28-31 of metal strapping are oriented at an acute angle to the axis of the pipe 10 so that the four strips of strapping are fed to the pipe at the same acute angle. Consequently, the strapping is wound helically on the pipe as the pipe is rotated'during the traversing movement of the carriage along the length of the pipe.
  • the multiple strips of strapping may be wound on the pipe in a number of different patterns, but one particularly useful pattern is shown in FIG. 6 and is described in the assignees copending U.S. Pat. application Ser. No. 227,822, filed Feb. 22, 1972, entitled Method of Wrapping Pipe with Multiple Strips of Metal Strapping and Resulting Product," filed concurrently herewith.
  • each strip of metal strapping 28a, 29a, 30a and 31a wrapped around the pipe 10 overlaps each adjacent strip of strapping by an amount suchthat the abutting edges of successive winding'of the strip in each layer are axially spaced from the abutting edges of successive windings of the strips in all other layers.
  • a pair of dummy mandrels are disposed adjacent the pipe chucks and have outside diameters substantially the same as that of the pipe 10 so that the wound strapping may continue .beyond the ends of the pipe onto the dummy mandrels.
  • a pair of dummy mandrels 40 and 41 are mounted between the mandrels l3 and 14 and their respective head assemblies 11 and 12.
  • the dummy mandrels 40 and 41 are fixed to the shafts that rotate the mandrels 13 and 14 so that the dummy mandrels are rotated along with the pipe 10 when the mandrel 13 is rotated.
  • the dummy mandrels 40 and 41 are positioned so that when the pipe 10 is mounted on the mandrels 13 and 14, the ends of the pipe 10 abut the two corresponding ends of the dummy mandrels 40 and 41 so that the outside surfaces of the pipe 10 and the two mandrels 40 and 41 form a substantially continuouscylindrical surface.
  • Thestrapping carriage 20 is shown in its starting position in FIG. 1, so that the wrapping operation starts at the dummy mandrel 41, proceeds along the length of the pipe 10, and terminates on the dummy mandrel 40.
  • the strip of metal strapping in each of the four layers overlaps the strip of metal strapping each adjacent layer by (1 A) or ofthe width of each strip of strapping.
  • This fraction of overlap can be expressed generally as (l-l/n) where n is the number of layers of metal strapping wound on the pipe.
  • the additional strength imparted by thereinforcing wrapping is substantially uniform along the entire length of the pipe. and around the entire-circumference of the pipe. Thus, there are not any weak areas in the wrapping where the wrapped pipe is more susceptible to fracture than in other areas.
  • the carriage 20 includes means for automatically feeding the leading ends of the multiple strips of strapping into a cavity formed in the outer surface of the mandrel 41,
  • the carriage 20 includes a pair of clamping jaws 42 and 43 whichare opened and closed by means of a hydraulic actuating cylinder 44.
  • the cylinder 44 is actuated to close the clamping jaws 42 and 43, thereby clamping all four strips of metal strapping between the jaws with the free ends of the strapping extending beyond. the jaws 42 and 43' toward the mandrel 41.
  • a second hydraulic cylinder 45 is advanced to pivot the entire clamping assembly about its pivot point 46, toward the dummy mandrel 4].
  • a clamping and cutoff tool 50 (FIG. 4) is advanced by a'hydraulic cylinder 51, with thetool 5 0 v I fitting into a complementally formed cavity 52 in the outer surface of the dummy mandrel 40;
  • the leading end of the tool 50 is rounded so as to deform the metal strapping into the cavity 51 to provide a clamping action, while the top of the tool. 50 forms a cutting edge invention
  • a pair of clamping ring locators 70 and 71 are provided for receiving and holding clamping rings for holding the wrapped strapping on the pipe 10.
  • a clamping ring 73 is disposed concentrically within each locator 70 and 71 and held therein by tightening the locator to reduce the inside diameter until it clamps the clamping ring 73 firmly in place.
  • a number of different types of clamping rings may beemployed in the illustrative apparatus, but one particularly useful clamping ring is shown in FIG. 8 and is described in the assignees copending U.S. Pat. application Ser. No. 227,797 filed, Feb. 22, 1972 entitled Clamp and Reinforcing Ring For Pipe Wrapping, filed concurrently herewith.
  • the clamping ring 73 comprises a unitary metal annulus forming a pair of annular peripheral sections 74 and 75 and an annular center section 76 curved outwardly away from the wrapped pipe to form a concave inner surface 77.
  • the ring engages the surface of the wrapped pipe on both sides of the concave surface 77 so that when the pipe 10 is expanded in the radial direction, the center section 76 of the ring is deformed to increase the radius of the curvature thereof, thereby creating a spring force pressing inwardly against the wrapped pipe in the radial direction.
  • the radial expansion of thewrapped pipe deforms the bowed center section 76 from its original configuration, and the tendency of the deformed center section to return to its original configuration produces a radial biasing force applied inwardly against .the wrapped pipe.
  • Both peripheral sections 74 and 75 of the illustrative ring are bent outwardly away from the wrapped pipe at a slight angle so that the inside diameters of the peripheries of the ring are greater than the outside diameter of the wrapped pipe, thereby facilitating the fitting of the ring-onto the end of the pipe.
  • the flared periphery also facilitates sliding of the clamping ring 73 axially over the surface of the wrapped pipe without catching on the edges of the successive windings of the outermost layer of metal strapping.
  • Each locator is movable-axially along the pipe on the bed for locating the clamping ringfnear the end of the wrapped pipe and radially adjacent the corresponding expanding mandrel 13 or 14 so that expansion of the mandrel expands the end of the pipe outwardly against the clamping ring to clamp the strapping onto the. pipe.
  • a cylinder rod 78 is passed through.
  • the locators are advanced over the pipe 10 so as to locate the clamping rings 73 immediately adjacent the ends of the pipe, and the expanding mandrels 13 and 14 are then actuated to press radially outwardly against the pipe and thereby expand the ends of the wrappedpipe ,outwardly against the clamping rings 73.
  • cutting means are located at opposite ends of the pipe 10 for cutting the multiple strips of strapping at both ends of the pipe upon completion of the wrapping operation.
  • a pair of cutting discs 60 and 61 are mounted on the ends of power driven shafts 62 and 63 directly above the two dummy mandrels 40 and 41, respectively.
  • the shafts 62 and 63 are driven by motors 64 and 65, which in turn are pivotally mounted on brackets 66 and 67 formed on the head assemblies 11 and 12, respectively.
  • the two cutting discs 60 and 61 are loweredby means of hydraulic actuating cylinders'68 and 69, respectively, so that'the cutting edges of the two discs 60 and 61 are lowered into engagement with the metal strapping wrapped around the pipe 10.
  • the cutting discs and 61 are positioned so that when they are lowered they are in alignment with the ends of the pipe 10.
  • the cutting discs 60 and 61 are then rotated simultaneously with rotation of the pipe 10 so asto cut off the metal strapping flush with the ends of the pipe 10.
  • the scrap portions of the strapping remaining on the two dummy mandrels 40 and 41 is peeled off these mandrels and disposed of, so that the equipment is readyfor the next wrapping operation.
  • the carriage 20 is returned to its starting po'-' sition, ready to begin the wrapping of the next pipe 10 and the wrapped pipe is ready for removal from the machine.
  • this invention provides an improved method and apparatus for wrapping pipe with multiple strips of strapping which are wound onthe pipe simultaneously I in overlapping relationship with each other.
  • the strapping is automatically fed to the first dummy mandrel and clamped thereto, and then automatically wound in helical fashion onto the first dummy mandrel 41, the
  • the wound strapping is then ,cut flush with the ends of the pipe 1 0.by the two cutting discs 60 and 61, after which the strapping remaining on the mandrel 40 is cut by the tool 50.'The remaining scrap'portions of the metal scrapping may then bepeeled off the. two dummy mandrels 40 and 4110 ready the machine for the next wrapping operation. It can be seen that operation of the illustrative machine is simple and efficient, and yet the equipment is of rugged construction so as to provide a long operating life with low maintenance costs. It will be appreciated that the invention is applicable to a wide variety of different wrapping operations, includ ing different numbers of strips of metal strapping which may be wrapped around the pipe different helical patterns, and with different degrees of overlap between adjacent strips of strapping.
  • Apparatus for wrapping pipe withimultiple strips I of high strength metal strapping comprising the combination of a pair of chucks for engaging opposite ends of a length of pipe and rotating the pipe about its axis, a pair of dummy mandrels disposed adjacent said chucks and having outside diameters substantially the same as that of said pipe, carriage means including means for holding a plurality of spools of strips of strapping at both ends of said pipe upon com-' pletion of the wrapping of said pipe and longitudinal cutting means mounted on said carriage means for axially cutting the strapping wrapped on the dummy mandrel at the end of the pipe where the wrapping is stopped.
  • each of said chucks comprises an expanding mandrel.
  • Apparatus for wrapping pipe with multiple strips of high strength metal strapping comprising the combination of pair of chucks for engaging opposite ends of a length of pipe and rotating the pipe about its axis, a pair of dummy mandrels disposed adjacent said chucks and having outside diameters substantially the same as that of said pipe, carriage means including means for holding a plurality of spools of metal strapping and means for simultaneously feeding multiple strips of strapping from said spools onto said dummy mandrels and said pipe with the adjacent strips of strapping overlapping each other, said carriage means also including feeding means for automatically feeding the ends of said multiple strips of strapping to the'dummy mandrel at the end of the pipe where the wrapping is started, said dummy mandrel at the starting end of the pipe including clamping means for clamping the ends of said multiple strips of strapping, and means for moving said carriage means axially along said pipe while said pipe is rotating so as to wrap said multiple strips of strapping around said dummy mandrels and said

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Basic Packing Technique (AREA)
  • Wire Processing (AREA)
US00227995A 1972-02-22 1972-02-22 Apparatus for wrapping pipe with multiple strips Expired - Lifetime US3823883A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00227995A US3823883A (en) 1972-02-22 1972-02-22 Apparatus for wrapping pipe with multiple strips
JP47047772A JPS4897116A (de) 1972-02-22 1972-05-16
DE2237423A DE2237423A1 (de) 1972-02-22 1972-07-29 Rohrbaugruppe und verfahren und einrichtung zu ihrer herstellung
CA163,122A CA981652A (en) 1972-02-22 1973-02-07 Method and apparatus for wrapping pipe with multiple strips of strapping

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00227995A US3823883A (en) 1972-02-22 1972-02-22 Apparatus for wrapping pipe with multiple strips

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US3823883A true US3823883A (en) 1974-07-16

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US (1) US3823883A (de)
JP (1) JPS4897116A (de)
CA (1) CA981652A (de)
DE (1) DE2237423A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446607A (en) * 1981-07-30 1984-05-08 Caterpillar Tractor Co. Apparatus and method for forming an external guard member on a hose
US4856720A (en) * 1977-05-04 1989-08-15 The Goodyear Tire & Rubber Company Helical winding apparatus
US5273611A (en) * 1992-05-04 1993-12-28 Sig-A-Rap Apparatus for applying a continuous film to a pipeline
US6098913A (en) * 1999-03-09 2000-08-08 Tek-Rap, Inc. Machine for applying a protective material onto a pipe
US6335508B1 (en) * 2000-05-25 2002-01-01 Kyong H. Nam Pipe handling system for laser and other pipe treating processes
US20160250822A1 (en) * 2015-02-26 2016-09-01 AHN Chem Co., LTD Radiant insulation protector manufacturing apparatus and radiant insulation protector manufactured using same
CN108087636A (zh) * 2017-11-28 2018-05-29 嘉峪关天源新材料有限责任公司 一种可用于焊接的金属减振复合管及其制备方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112895A (en) * 1961-12-11 1963-12-03 Crossley Machine Company Inc Spiral tape winding machine
US3157405A (en) * 1963-01-30 1964-11-17 Robert W Hafemeister Chuck
US3221401A (en) * 1961-06-28 1965-12-07 Dorr Oliver Inc Strip tensioner
US3603517A (en) * 1969-01-14 1971-09-07 Smith Corp A O Fiber band regulator for fiberglass pipe winder
US3666598A (en) * 1970-07-13 1972-05-30 Goodyear Tire & Rubber Apparatus for making a rolling lobe diaphragm

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221401A (en) * 1961-06-28 1965-12-07 Dorr Oliver Inc Strip tensioner
US3112895A (en) * 1961-12-11 1963-12-03 Crossley Machine Company Inc Spiral tape winding machine
US3157405A (en) * 1963-01-30 1964-11-17 Robert W Hafemeister Chuck
US3603517A (en) * 1969-01-14 1971-09-07 Smith Corp A O Fiber band regulator for fiberglass pipe winder
US3666598A (en) * 1970-07-13 1972-05-30 Goodyear Tire & Rubber Apparatus for making a rolling lobe diaphragm

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856720A (en) * 1977-05-04 1989-08-15 The Goodyear Tire & Rubber Company Helical winding apparatus
US4446607A (en) * 1981-07-30 1984-05-08 Caterpillar Tractor Co. Apparatus and method for forming an external guard member on a hose
US5273611A (en) * 1992-05-04 1993-12-28 Sig-A-Rap Apparatus for applying a continuous film to a pipeline
US6098913A (en) * 1999-03-09 2000-08-08 Tek-Rap, Inc. Machine for applying a protective material onto a pipe
WO2000053351A1 (en) * 1999-03-09 2000-09-14 Tek-Rap, Inc. Machine for applying a protective material onto a pipe
US6335508B1 (en) * 2000-05-25 2002-01-01 Kyong H. Nam Pipe handling system for laser and other pipe treating processes
US20160250822A1 (en) * 2015-02-26 2016-09-01 AHN Chem Co., LTD Radiant insulation protector manufacturing apparatus and radiant insulation protector manufactured using same
US9776375B2 (en) * 2015-02-26 2017-10-03 AHN Chem Co., LTD Radiant insulation protector manufacturing apparatus and radiant insulation protector manufactured using same
CN108087636A (zh) * 2017-11-28 2018-05-29 嘉峪关天源新材料有限责任公司 一种可用于焊接的金属减振复合管及其制备方法
CN108087636B (zh) * 2017-11-28 2020-04-07 嘉峪关天源新材料有限责任公司 一种可用于焊接的金属减振复合管及其制备方法

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Publication number Publication date
CA981652A (en) 1976-01-13
JPS4897116A (de) 1973-12-11
DE2237423A1 (de) 1973-08-30

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