US3190780A - Method of applying protective wrappings to pipe - Google Patents

Method of applying protective wrappings to pipe Download PDF

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Publication number
US3190780A
US3190780A US114277A US11427761A US3190780A US 3190780 A US3190780 A US 3190780A US 114277 A US114277 A US 114277A US 11427761 A US11427761 A US 11427761A US 3190780 A US3190780 A US 3190780A
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US
United States
Prior art keywords
enamel
pipe
wrapping
glass cloth
layer
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
US114277A
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English (en)
Inventor
Frank E Mcnulty
Robert M Nee
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.)
Nee and Mcnulty Inc
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Nee and Mcnulty Inc
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 Nee and Mcnulty Inc filed Critical Nee and Mcnulty Inc
Priority to US114277A priority Critical patent/US3190780A/en
Application granted granted Critical
Publication of US3190780A publication Critical patent/US3190780A/en
Priority to BE686131D priority patent/BE686131A/xx
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
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/16—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings the coating being in the form of a bandage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
    • B29C63/08—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically
    • B29C63/10—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically around tubular articles
    • B29C63/105—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like by winding helically around tubular articles continuously

Definitions

  • the present invention relates to a novel method of Wrapping a conduit. More particularly it is concerned with an improved method of wrapping long lengths of coated pipelines prior to burial thereof.
  • bituminous enamel In protecting these lines from various corrosive agents by first coating the pipe with a primer, which is a solvent solution of an asphalt or tar-like substance, there is placed over the primer a layer of bituminous enamel, usually from about three thirty-seconds to about five thirty-seconds of an inch.
  • a primer which is a solvent solution of an asphalt or tar-like substance
  • bituminous enamel usually from about three thirty-seconds to about five thirty-seconds of an inch.
  • bituminous enamel or enamel as used in the present description and claims are intended to include any such coating material known to be suitable for the purposes contemplated herein. Owing to the fact that this enamel is subject to cold flow and can be damaged in the process of laying the pipe, or can be readily deformed by soil stress, etc. after the line has been laid, the enamel must be strengthened and reinforced by means of a protective layer.
  • This reinforcing material usually consists of a flexible sheet of glass fiber mat. Properly applied, this reinforcing material should penetrate the fresh enamel to a depth generally corresponding to about one-third of the thickness (measured inwardly from the outside surface) of the enamel coating.
  • the reinforcing sheet itself is preferably impregnated with the enamel.
  • the glass fiber mats used in wrapping pipelines are usually about 20 mils thick and are made of small glass fibers dispersed in and held together by asuitable resin. 7
  • glass cloth of suitable porosity and another conventional material such as kraft paper or asbestos pipeline felt.
  • the glass cloth is arranged on the roll so that in the wrapping operation it is next to the enamel side of the pipe while the kraft paper rides on top of the glass cloth.
  • the glass cloth should be wound thereon so that the free end of the cloth overlaps the corresponding end of the kraft paper.
  • the ends of the two wrapping materials are preferably placed in line with one another, thus leaving a small amount, for example, from about one-half to two inches, of slack in the glass cloth.
  • the two layers of wrapping material may be put on the roll or spool in equal lengths.
  • the free end of the paper layer may be afiixedto the enamel first with the underneath layer of glass cloth being placed on the enamel an inch or two behind the end of the paper.
  • suflicient slack in the 7 glass fabric layer is created to permit said fabric to be laid on the enamel in accordance with our invention.
  • FIGURE 1 is an isometric view showing a pipeline wrapping operation using the method of our invention.
  • FIGURE 2 is a sectional view taken at 2 in FIGURE 1 showing in detail the structure of the wrapping on the pipe.
  • FIGURE 3 is a modification of FIGURE 2 in which a thermoplastic film is substituted for the inner layer of glass cloth.
  • a line pipe 1 is covered with a relatively thick coating of enamel 4.
  • the line pipe is held by a conventional line traveling machine 6 shown only in a fragmentary view.
  • Wrapping arms 8 are operated by wrapping head 10.
  • the wrapping arms hold rolls 12 containing strips of interrolled glass cloth 14 and kraft paper 16.
  • the tension exerted on the kraft paper may be controlled by turning knobs 18 which regulate the breaking action exerted on spools 20.
  • the glass cloth strip is slightly longer causing a small loop 22 therein next to enamel 4. This allows the cloth 14 to be laid substantially without tension onto the enamel.
  • the glass cloth sinks slightly into the enamel and becomes impregnated therewith as shown in some detail in FIG- URE 2.
  • FIGURE 1 is an enlarged sectional view of a wrapped portion of the pipe shown in FIGURE 1 illus trating how glass fabric 14 partially sinks into enamel layer 4.
  • a relatively thin layer 17 of enamel lies between the fabric 14 and paper layer 16 thus forming a firm compactly wrapped pipe capable of giving many years of uninterrupted service.
  • thermoplastic layer or film 24 the plastic film rests on the surface of enamel 4 since the latter does not penetrate said film.
  • outer layer 16 may be of kraft paper, it need not necessarily be since the enamel does not pass through film 24.
  • outer layer 16 the essential purpose of which is to serve as a carrier for slack film 24, may be perforate or imperforate since the plastic film, itself, prevents any enamel from flowing through to the outer layer or layers.
  • the glass cloth or fabric used in carrying out our invention should be of a sufiiciently coarse weave to permit relatively rapid impregnation of the enamel.
  • glass cloth having no more than about 34 by 38 threads to the inch should be used.
  • cloth woven to have from by to 26 by 34 threads to the inch is preferred.
  • the expressions glass cloth or woven glass fabric or woven glass textile cloth as used herein are intended to be limited to wrapping material with the aforesaid characteristics.
  • thermoplastic film For glass cloth, as employed in our invention, a suitable thermoplastic film may be substituted.
  • the use of such plastic film offers numerous advantages; however, prior to the present invention no method, to our knowledge, has been known by which the plastic film could be applied to a hot enameled surface.
  • the principal difiiculty in this regard has been due mainly to the fact that the application temperature of the coal tar or similar enamel may be as high as 500 F. At temperatures of this magnitude thermoplastic film has very little if any tensile strength. Accordingly, at such temperatures it is impossible to cover the enameled surface with film of the aforesaid kind by conventional wrapping methods.
  • thermoplastic films such as, for example, polypropylene, high or low density polyethylene, etc., from about 1 to about 7 mils in thickness, may be applied to a pipeline coated with hot enamel.
  • said outer layer serves to carry the thin plastic film plus the hot applied enamel which has a tendency to run or flow at temperatures employed during the wrapping operation.
  • a wrapping of thermoplastic film is placed about the conduit without any stress being exerted on said film while the wrapping operation takes place.
  • the line wrapped in this manner is allowed to cool the plastic film regains its original tensile strength thus providing a high quality shield for the bituminous coating.
  • Films of the aforesaid type can be employed in accordance with our invention even where relatively high temperatures, for example, F., are encountered in the line such as is true in the case of the discharge side of a compressor station.
  • High density polyethylene which retains good tensile strength and hardness up to temperatures of about F., is well suited to applications of this type.
  • a method of wrapping a pipe covered with a hot flowable coating of enamel which comprises, affixing the free ends of a plurality of layers of protective sheet-like material to the enameled surface of said pipe, at least the outer layer of said material being impervious to said enamel, maintaining substantially no tension on the inner layer of said material next to said enamel while exerting substantially all the tension required to effect the wrapping operation on the other of said layers, and thereafter spirally wrapping said pipe with said material while said enamel is in a hot fiowable condition, said layers being superposed on one another and unwound from the same source onto said pipe.
  • thermoplastic film is polyethylene
  • thermoplastic film is polypropylene

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
US114277A 1961-05-19 1961-05-19 Method of applying protective wrappings to pipe Expired - Lifetime US3190780A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US114277A US3190780A (en) 1961-05-19 1961-05-19 Method of applying protective wrappings to pipe
BE686131D BE686131A (fr) 1961-05-19 1966-08-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US114277A US3190780A (en) 1961-05-19 1961-05-19 Method of applying protective wrappings to pipe

Publications (1)

Publication Number Publication Date
US3190780A true US3190780A (en) 1965-06-22

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US114277A Expired - Lifetime US3190780A (en) 1961-05-19 1961-05-19 Method of applying protective wrappings to pipe

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US (1) US3190780A (fr)
BE (1) BE686131A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420722A (en) * 1965-12-15 1969-01-07 Nee & Mcnulty Inc Method of applying a protective wrapping to a conduit
US4192697A (en) * 1977-03-25 1980-03-11 Winn & Coales (Denso) Limited Hot applied coatings
US4225370A (en) * 1979-01-08 1980-09-30 Internorth, Inc. Contracted fibrous overwrap method for thermoplastic coated article
US4300963A (en) * 1978-11-01 1981-11-17 Assi Can Aktiebolag Method of manufacturing cylindrical tubes and apparatus for carrying out the method
US4761194A (en) * 1983-01-06 1988-08-02 Raychem Limited Method of environmental sealing
US5019195A (en) * 1989-03-17 1991-05-28 Skinner George F Method of encapsulating a coated substrate
US5143757A (en) * 1989-03-17 1992-09-01 SKINNER George Encapsulating a substrate
US6200397B1 (en) 1999-11-08 2001-03-13 John R. Allen Method and apparatus for strip anode wrapping for cathodic protection of tubular members
US20030201360A1 (en) * 2002-04-29 2003-10-30 Hill Courtland P. Tape wrapping machine with controllable tensioning
US6641330B1 (en) * 1999-10-21 2003-11-04 Stolt Offshore As Method and apparatus for laying elongated articles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024153A (en) * 1958-08-25 1962-03-06 Kennedy Ted Method of forming a pipe covering
US3033724A (en) * 1956-03-26 1962-05-08 Plicoflex Inc Laminated protective sheath in sheet form and method of applying same to a pipe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033724A (en) * 1956-03-26 1962-05-08 Plicoflex Inc Laminated protective sheath in sheet form and method of applying same to a pipe
US3024153A (en) * 1958-08-25 1962-03-06 Kennedy Ted Method of forming a pipe covering

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420722A (en) * 1965-12-15 1969-01-07 Nee & Mcnulty Inc Method of applying a protective wrapping to a conduit
US4192697A (en) * 1977-03-25 1980-03-11 Winn & Coales (Denso) Limited Hot applied coatings
US4300963A (en) * 1978-11-01 1981-11-17 Assi Can Aktiebolag Method of manufacturing cylindrical tubes and apparatus for carrying out the method
US4225370A (en) * 1979-01-08 1980-09-30 Internorth, Inc. Contracted fibrous overwrap method for thermoplastic coated article
US4761194A (en) * 1983-01-06 1988-08-02 Raychem Limited Method of environmental sealing
US5019195A (en) * 1989-03-17 1991-05-28 Skinner George F Method of encapsulating a coated substrate
US5143757A (en) * 1989-03-17 1992-09-01 SKINNER George Encapsulating a substrate
US6641330B1 (en) * 1999-10-21 2003-11-04 Stolt Offshore As Method and apparatus for laying elongated articles
US6200397B1 (en) 1999-11-08 2001-03-13 John R. Allen Method and apparatus for strip anode wrapping for cathodic protection of tubular members
US20030201360A1 (en) * 2002-04-29 2003-10-30 Hill Courtland P. Tape wrapping machine with controllable tensioning
US20050082413A1 (en) * 2002-04-29 2005-04-21 Hill Courtland P. Tape wrapping machine with controllable tensioning

Also Published As

Publication number Publication date
BE686131A (fr) 1967-02-01

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