US3168297A - Furnace pipe insulation and method - Google Patents

Furnace pipe insulation and method Download PDF

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Publication number
US3168297A
US3168297A US193575A US19357562A US3168297A US 3168297 A US3168297 A US 3168297A US 193575 A US193575 A US 193575A US 19357562 A US19357562 A US 19357562A US 3168297 A US3168297 A US 3168297A
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United States
Prior art keywords
pipe
wire
coils
coil
heat resisting
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Expired - Lifetime
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US193575A
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English (en)
Inventor
John R Brough
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Inland Steel Co
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Inland Steel Co
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Filing date
Publication date
Priority to BE626999D priority Critical patent/BE626999A/xx
Application filed by Inland Steel Co filed Critical Inland Steel Co
Priority to US193575A priority patent/US3168297A/en
Priority to GB60/63A priority patent/GB1025260A/en
Priority to AT337263A priority patent/AT259614B/de
Application granted granted Critical
Publication of US3168297A publication Critical patent/US3168297A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/14—Supports for linings
    • F27D1/141—Anchors therefor
    • F27D1/142—Anchors made from ceramic material
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/022—Skids

Definitions

  • the billets In passing through a furnace while undergoing reheating to a predetermined temperature, the billets are conventionally supported on longitudinally extending skid means or tracks upon which the transversely extending billets slide.
  • these tracks or skid means might be solid rails but for heavier billets and, for that matter, for all high temperature end discharge furnaces, water cooled skid means in the form of skid pipes are standard equipment.
  • These water cooled skid pipes normally have a wear strip welded on their upper surface and extending longitudinally of the pipes to support the billets in sliding relationship.
  • the longitudinally extending horizontal skid pipes are carried by transversely extending horizontal crossover pipes which in turn are supported by vertically extending support pipes. Water preferably courses through all the pipes in a well known manner to provide cooling thereof.
  • refractory material flakeaway from the reinforcing reticulated metal structure exposing it to the heat of the furnace which not only considerably reduces the effectiveness of the insulation but materially shortens its life.
  • refractory is caused by a marked temperature. diiference between the refractory material within or around the reinforcing metal structure and the overlying refractory material.
  • the invention contemplates encircling a conventional steel furnace pipe havinga water carrying capacity with coils of wire: and securing the coils .tothe pipe with tie-wires threaded through the coils-
  • the coils are defined by wires, in. themselves. coiling'about axes encircling the pipe.
  • Refractory material in a plastic state is applied to the pipe so that it. is in. intimate contact with the coils. 'andthe outer surface of the pipe.
  • One, aspect of the present invention lies in the utilizat tion of alternating orotherwise successively arrangedindividual' encircling coils of high temperature heat resisting alloy wire and ordinarycarbon steel wire.
  • the coils are secured to the pipe by tie wiresof corresponding composition threaded through the coils.- Since these alternating or otherwise successively arranged coils of carbon steel Wire and high-temperature heat resistant alloy wire are spaced in, relatively close proximity of one another the refractory material is supported while in its plastic state without the use of a form. After the refractory is hardened by firing, however, substantially less support isneeded to. retain it on the pipe.
  • the coils of high temperature heat resistant alloy wire are sufiicient alone to effectively support the refractory wire;
  • the ordinary carbon steel wire due to its inherent physical characteristics and the high furnace temperatures, tends to lose its strength.
  • Another aspect of the present invention lies in the utilization of a substantially continuous coil of high temperature heat resisting alloy wire Wound spirally of the furnace pipe in parallel realtionship with a substantially continuous spirally wound coil or coils of ordinary carbon steel wire.
  • tie wires of corresponding composition are threaded through the spirally Wound coils and the coils might be alternated, or otherwise successively arranged in a generally similar fashion.
  • Another aspect of the present invention lies in the utilization of relative larger 7 diameter ordinary carbon steel wirecoils and relatively lesser diameter high temperature heat resistant alloy Wire coils.
  • This arrangement of the wire coils is such that anirregular stress pattern is set up in the hardened refractory insulation to virtually eliminate serious lines or plane of weakness in the insulation.
  • FIGURE 1 is a perspective view of conventionally arranged water cooled furnace pipes in an underfired steel mill reheating furnace;
  • FIGURE 2 is a front elevational View of a portion of support pipe or a cross-over pipe showing one form'of an arrangement of reinforcing wire coils prior to the application of refractory material;
  • FIGURE 3 is a rear elevational view of the arrangement shown in FIGURE 2;
  • FIGURE 4 is a view similar to FIGURE 3 showing the refractory insulating material applied to a portion of the pipe;
  • FIGURE 5 is a top plan view of the reinforcing wire coil arrangement for a skid pipe, prior to the application of refractory material;
  • FIGURE 6 is a front elevational view of the pipe shown in FIGURE 5; x
  • FIGURE 7 is a'view similar to FIGURE 5 showing the refractory material applied to a portion of the pipe;
  • FIGURE 8 is a front elevational view of a portion of a support pipe or a cross-over pipe showing another form of an arrangement of reinforcing wire coils prior to the application of refractory material;
  • furnace for example, is shown generally at 10.
  • the section 10 shown actually forms one set of skid to the pipe 17.
  • Each section 10 of the skid means preferably includes vertically extending insulated support pipes 11 carrying horizontally and transversely extending insulated crossover pipes 12.
  • the vertical support pipes 11 and the cross-over pipes 12 perform no other function than to support insulated longitudinally extending horizontal skid pipes 14.
  • Each of the insulated furnace pipes 11, 12, and 14 includes a conventional steel pipe 17 which might be comprised of one-half inch plate.
  • the bare pipes might be anywhere from two to eight inches in diameter. These dimensions, of course, are merely exemplary and it will be understood that they could vary substantially within limits.
  • the steel pipes 17 which form the backbone of the skid pipes 14 have wear strips 18 secured to their upper surfaces by welding, for example.
  • the longitudinally extending skid pipes 14 might be positioned on the transversely extending cross-over pipes 14 by U-shaped brackets 19'of any well known construction welded to the upper surface of the steel pipes 17 in the insulated crossover pipes 12.
  • the ver tically extending support pipes 11 and the horizontal transversely extending cross-over pipes 12 are ordinarily substantially identical to each other. Consequently, only the cross-over pipes 12 will be described in detail since the makeup of the insulation construction associated therewith is common to each.
  • FIGURES 2 through 4 where the construction of one form of an insulated cross-over pipe 12 is shown in detail, and particularly to FIGURE 2, the pipe 17 is shown to have a plurality of wire coils 21 encircling pipe 17 at generally regularly spaced intervals therealong.
  • These coils include a plurality of ordinary carbon steel wire coils 22 and another plurality of high temperature heat resisting alloy Wire coils 23.
  • the high temperature heat resisting alloy is preferably stainless steel although it is conceivable that other alloys might be utilized. Consequently, the succeeding description of this invention will frequently refer to stainless steel wire coils, though the coils could be formed of other metals.
  • stainless steel wire or wire of a generally analogous composition retains its optimum physical characteristics at substantially higher temperatures than ordinary carbon steel wire. Consequently, of course, the strength of the alloy steel wire coils is retained at temperatures high enough to cause ordinary carbon steel wire coils to deteriorate substantially in tensile strength, for example, and in other physical characteristics.
  • each carbon steel coil 22 Threaded through each carbon steel coil 22 is a carbon steel tie wire 27 which has its opposite ends tied together, as at 28, to tightly secure corresponding individual coils 22
  • each stainless steel coil 23 has a corresponding stainless steel tie wire 29 threaded therethrough and tied at its ends, as at 30, for example.
  • FIGURE 3 A view of the pipe 17 with its generally regularly spaced coils securely tied thereon is shown in FIGURE 3. The pipe appears as such immediately precedent to applying refractory cement thereto.
  • a layer 35 of refractory cement has been partially applied to the pipe 17.
  • this refractory material is in a plasticized state. It might be any well known type of high temperature refractory material, such as Chromite, for example, as has been pointed out.
  • the refractory material is packed in and around the wire coils 22 and 23 in its plastic state by hand or by any other well known method. It virtually encompasses and surrounds the generally toroidal coils and comes into intimate contact with both the wires and the surface of the pipe 17. After a pipe is completely covered with the plasticized refractory material layer 35 in this manner the refractory is permitted to harden.
  • the ordinary carbon steel coils 22 are especially significant. This is true throughout the period during which the refractory cement is hardening.
  • the ordinary carbon steel wire coils 22 have substantially large diameters and extend from the surface of the pipe 17 virtually to the surface of the refractory cement layer 35. In this manner, they provide completed reinforcement throughout the extent of the hardening layer 35 of refractory cement.
  • the coils of stainless steel wire 23 might be substantially smaller in diameter in which case their outermost extremities are relatively further from the surface of the layer 35 of refractory cement. Although they provide a substantial amount of reinforcement to the refractory cement in its plastic state, their primary purpose is to provide life long reinforcement of the hardened refractory material when the pipe is in operation in a high temperature furnace, for example.
  • the; refractory material is amply supported and reinforced by the stainless steel wire coils 23.
  • the coils 23 are substantially protected from damagingly extreme temperatures and consequently are additionally long lived and durable reinforcements for the refractory, although the coils might, in some applications, extend substantially to the surface of the refractory layer 35.
  • the ordinary carbon steel wire coils their primary purpose having been served in supporting the refractory cement in its plastic state, are more susceptible to high temperature deterioration.
  • FIGURES 8 and 9 Another form of the insulation construction embodying features of the present invention, which might be utilized in the support pipes and cross-over pipes, for example, is illustrated in FIGURES 8 and 9. Again, only a crossover pipe 12 is described in detail, since the makeup of the insulation construction inherent therein would be common to both the support pipes 11 and the cross-over pipes 12.
  • FIGURES 8 and 9 the other form of insulation construction for cross-over pipes 12, referred to above, is shown in detail.
  • components corresponding to components shown and described in relation to the insulation construction illustrated in FIGURES 2 through 4 will be identified by identical reference numerals plus 100.
  • the pipe 117 is shown to have a plurality of coils 121 encircling it at generally regularly spaced intervals therealong.
  • These coils include an ordinary carbon steel wire coil 122 and another coil 123 of high temperature heat resisting alloy wire.
  • the high temperature heat resisting alloy wire is preferably stainless steel although it is conceivable that other alloys might be utilized, as has been pointed out.
  • each carbon steel coil 122 Threaded through each carbon steel coil 122 is a'carbon steel tie'wire 127 which has its opposite ends tied to studs 131 to tightly secure the coil 122 to the pipe 117 (only one end of the coil 122 and one stud 131 is shown, of course).
  • each stainless steel coil 123 has a corresponding stainless steel tie wire 129 threaded therethrough and tied at its opposite ends to studs 132 (only one of which is shown) welded to the surface of the pipe 117.
  • the coils 121 are arranged on the pipe 117 such that a substantially continuous stainless steel wire coil 123 is spirally wound in parallel relationship with a carbon steel wire coil 122. This creates an alternating sequence around any chosen circumference of the pipe.
  • the sequence is merely exemplary of the arrangements which might be used. In practice, for example, a single stainless steel coil 123 might be spirally wound with two or more carbon steel coils 122.
  • a layer 135 of refractory cement is applied to the pipe 117.
  • the refractory material is in aplasticized state and might be any well known type of high temperature material such as Chromite, for example, as has also been pointed out.
  • FIGURE 10 Another form of the insulation construction embodying the features of the present invention is illustrated in FIGURE 10. Again, only a cross-over pipe 12 is described in detail, since the makeup of the insulation construction inherent therein will be common both to the support pipes 11 and the cross-over pipes 12. Furthermore, of course, it will be understood that the significant aspects of thepresent invention are readily adaptable to use with skid pipes.
  • the pipe 217 is shown to have a plurality of coils 221 encircling it at generally regularly spaced intervals therealong.
  • These coils include an ordinary carbon steel wire coil 222 and another coil 223 of high temperature heat resisting alloy wire which is preferably stainless steel although it is conceivable that other alloys might be utilized, as has been pointed out.
  • each carbon steel 'coil 222 Threaded through each carbon steel 'coil 222 is a carbon steel tie wire 227 which has its opposite ends tied to studs (not shown) to tightly secure the coil 222 to the pipe 217.
  • each stainless steel coil 223 has a corresponding stainless steel tie wire 229 threaded therethrough and tied at its opposite ends to studs (not shown) welded to the surface of the pipe 217.
  • the coils 221 are arranged on the pipes 217 such that a substantially continuous stainless steel wire coil 223 is spirally wound in parallel relationship with a carbon steel wire coil 222.
  • the sequence is merely exemplary of the arrangements which might be used. In practice, for example, a single stainless steel wire coil 223 might be spirally wound with two or more carbon steel Wire coils 222.
  • the stainless steel coils 223 are substantially of the same diameter as the carbon steel coils 222.v
  • the outermost extremities of both coils then, extend substantially to the surface of the refractory 235.
  • the present inventions utilization of wire coils with tie wires threaded through them obviates this necessity g the utilization of separate wire coils in the manner of the construction shown in FIGURES 1 through 7, for example, as it does to a spiral construction.
  • FIGURES 5 through 7 the insulation construction and method of insulating skid pipes 14 is shown in detail.
  • a wear strip 18 is welded to the upper surface of the steel pipe 17 forming the backbone of skid pipe 14, to provide a sliding surface for the billets of steel being supported by the skid pipes, the coils of stainless steel wire are anchored to the pipe on opposite sides of the wear strip 18 while the ordinary carbon steel coils are tied in the manner hereinbefore 0 described in encircling relationship of both the pipe and the wear strip.
  • studs 40 having collars 41 thereon are welded to the surface of the steel pipe 17 at generally regularly spaced intervals in longitudinal alignment along opposite sides of the wear strip 18.
  • the studs 40 provide means for anchoring the opposite ends of the stainless steel tie wires 29 extending through the coils 23 of stainless steel wire.
  • the tie wires 29 might be secured to the studs by being wrapped therearound and reversed to be wrapped around themselves, as seen in FIGURE 6.
  • the use of studs is merely exemplary, however, and other means of anchoring the ends of the stainless steel wire might be utilized.
  • the coils 22 of ordinary carbon steel wire are secured to the pipe 17 without the benefit of anchoring studs.
  • the tie wires 27 are threaded through corresponding coils 22 of carbon steel wire and tied over the wear strip 18, as at 45.
  • the free ends 46 of the tie wires 27 securing the carbon steel coils 22 to the pipe 17 might be tied, as at 50, to one or more of the adjoining studs 40.
  • the layer 35 of refractory cement in its plastic state is applied to the surface of the pipe 17 such that it encompasses and surrounds the wire coils 22 and 23 and the studs 40. In this relationship it is in intimate contact with the surface of the pipe 7 -17, each of the wire coils'22 and 23 and the tie wires 27 and 29, and hardens in this relationship.
  • the refractory material is supported to a great extent by the larger diameter carbon steel coils 22.
  • Considerable support is also offered, as will easily be understood, by the alloy steel coils 23 which are of somewhat smaller diameter and consequently do not extend as close to the surface of the layer 35 of refractory cement as do the carbon steel coils 22.
  • the tie wires 27 for the ordinary carbon steel coils 22 might be snipped on opposite sides of the wear strip 18, as at 51, where they protrude from the refractory material, and the pipe is ready for service.
  • the protruding wires are ordinarily left intact for the heat of the furnace to soften and oxidize wherein they are sheared or broken by steel being pushed onto the skids.
  • the steel pipe 17 forming the backbone of the skid pipes might be left bare of insulation to afford a spot for con-tact by the brackets 19 in supporting relationship.
  • this feature forms no part of the invention and it is not thought necessary that it be shown in detail.
  • the primary advantages inherent in the insulation construction of the skid pipes 14 are similar to those inherent in the insulation construction of the various forms of cross-over pipes 12 hereinbefore described.
  • the coils are of somewhat varying diameter, no planes or lines of weakness are es 'tablished in the hardened insulation and consequently the durability and life of the insulation is greatly improved.
  • the specific arrangement of the alternating or otherwise interspersed coils of varying diameter carbon steel and stainless steel wire is such that the stainless steel coils can be better protected from the maximum temperatures generated in the furnace.
  • the outermost extremities of the alternating coils define a somewhat undulating surface which does not set up lines or planes of weakness in the hardened refractory.
  • the insulation construction which results is less expensive, more durable,- and easier to construct than similar known arrangements.
  • a reinforced insulating covering for a furnace pipe comprising insulation means, said insulation means in cluding coil means fabricated of substantially high temperature heat resisting wire adapted to extend circumferentially of the pipe, said coil means including a series of circumferentially extending coil portions separated from each other along any longitudinal line through said insulation means, the wire of each of said coil portions in itself coiling about an axis adapted to encircle the pipe, means adapted to secure said coil means to the pipe, said insulation means further including a layer of refractory material encompassing and intimately contacting the wire of said coil means and adapted to intimately contact and surround the pipe.
  • An insulated pipe construction comprising a pipe, coil means extending circumferentially of said pipe and fabricated of substantially high temperature heat resisting wire, said coil means including a series of circumferentially extending coil portions separated from each other along any longitudinal line on said pipe, the wire of each of said coil portions in itself coiling about an axis encircling said pipe, means securing said coil means to said pipe, and a layer of refractory material surrounding said pipe and intimately contacting said pipe and the wire of said coil means.
  • said coil means of substantially high temperature heat resisting wire comprises a substantially continuous coil of wire extending ingenerally spiral relationship longitudinally in said insulation.
  • a reinforced insulationfor afurnace pipe comprising a coil of substantially high temperature heat resisting wire adapted to extend circumferentially of the pipe, means adapted to secure said substantially. high temperature heat resisting wire coil to the pipe, a coil of relatively lower temperature heat resisting wire spaced-from said substantially high temperature heat resisting wire coil and adapted to extend circumferentially of the pipe, means adapted to secure said relatively low temperature heat resisting wire coil to the pipe, and a layer of refractory material-intimately contacting andsurrounding the wire of said coils and adapted to intimately contact and surround the pipe.
  • eachof said securing means includes tie wire means extending through said coils.
  • each of said securing means includes tie wire means extending through said coils.
  • An insulated pipe construction comprising a pipe, a coil of substantially high temperature heat resisting wire extending circumferentiaily of said pipe, means securing said substantially high temperature heat resisting Wire coil to said pipe, a coil of relatively. low temperature heat resisting Wire spaced from said substantially high temperature heat resisting Wire coil and extending, circumferentially of said pipe, means securing said relatively low temperature heat resisting wire coil to said pipe, and a layer of refractory material surrounding said pipe and intimately contacting said pipe and the wire of said coils.
  • An insulated pipe construction comprising a pipe, a plurality of coils of substantially high temperature heat resisting wire extending circumferentially of said pipe, a substantially high temperature heat resisting tie wire extending through each of said coils, means anchoring the opposite ends of said substantially high temperature heat resisting tie wires to secure said substantially high tem perature heat resisting wire coils to said pipe, a plurality of relatively low temperature heat resisting wire coils interspersed and spaced from said substantially high temperature heat resisting wire coils and extending circumferentially of said pipe, a relatively low temperature heat resisting tie wire extending through each of said relatively low temperature heat resisting wire coils, means anchoring the opposite ends of said relatively low temperature heat resisting tie wires to secure said relatively low temperature heat resisting wire coils to said pipe, and a layer of refractory material surrounding said pipe and intimately contacting said pipe and the Wire of said coils.
  • the insulated furnace pipe construct-ion of claim 12 further characterized in that the diameter of said substantially high temperature heat resisting wire coils is less than the diameter of said relatively low temperature heat resisting wire coils.
  • An insulated furnace pipe construction comprising amass? i i a pipe, a coil of substantially high temperature heat resisting wire extending circumferentially of said pipe, a substantially high temperature heat resisting tie wire extending through said substantially high temperature heat resisting wire coil and securing said coil to said pipe, a relatively low temperature heat resisting wire coil spaced from said substantially high temperature heat resisting wire coil and extending generally parallel thereto circumferentially of said pipe, a relatively low temperature heat resisting wire extending through said relatively low temperature heat resisting wire coil and securing said relatively low temperature heat resisting wire coil to said pipe, and a layer of refractory material surrounding said pipe and intimately contacting said pipe and the wire of said coils.
  • the insulated furnace pipe construction of claim 14 further characterized in that the diameter of said relatively low temperature heat resisting wire coil is slightly greater than the diameter of said substantially high temperature heat resisting wire coil, the thickness of said layer of refractory material being slightly greater than the diameter of said relatively lowtemperature heat resisting Wire coil.
  • the insulated furnace pipe construction of claim 15 further characterized in that said coils of wire are disposed in a spiral arrangement circumferentially and longitudinally of said pipe.
  • An insulated water coiled skid pipe construction comprising a pipe, longitudinally extending skid means secured to said pipe, a plurality of coils of substantially high temperature heat resisting wire extending circumferentially of said pipe, a substantially high temperature heat resisting tie Wire extending through each of said coils, V
  • a method of insulating a pipe for use in high temperature furnaces comprising the steps of encircling the pipe with a coil oi substantially high temperature heat resisting wire, securing the coil of substantially heat resisting wire to the pipe with a tie wire passing therethrough, encircling the pipe with a coil of relatively low temperature heat resisting wire extending substantially parallel to said coil of substantially high temperature heat resisting wire, securing said coil of relatively low temperature heat resisting wire to said pipe with a tie wire passing therethrough, and covering the pipe and coils with a layer of plasticized refractory material such that the refractory material encompasses and surrounds the wire coils and comes into intimate contact with the surface of the pipe and the wire, and allowing the refractory material to harden in this relationship.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
  • Thermal Insulation (AREA)
US193575A 1962-05-02 1962-05-02 Furnace pipe insulation and method Expired - Lifetime US3168297A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE626999D BE626999A (d) 1962-05-02
US193575A US3168297A (en) 1962-05-02 1962-05-02 Furnace pipe insulation and method
GB60/63A GB1025260A (en) 1962-05-02 1963-01-01 Reinforced insulation for furnace pipes
AT337263A AT259614B (de) 1962-05-02 1963-04-26 Wärmeisolierung für Rohre in industriellen Öfen, insbesondere Stoßöfen

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US193575A US3168297A (en) 1962-05-02 1962-05-02 Furnace pipe insulation and method

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US3168297A true US3168297A (en) 1965-02-02

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3337199A (en) * 1965-07-14 1967-08-22 George B Kirkpatrick Angularly disposed water-cooled skid rails
US3788800A (en) * 1972-11-29 1974-01-29 Salem Corp Rabble for rotary hearth furnace
US3804585A (en) * 1972-07-06 1974-04-16 Urguhart Eng Co Ltd Precast furnace pipe insulation
US3955600A (en) * 1971-06-07 1976-05-11 Bechtel International Corporation Composite pipeline
US4255127A (en) * 1979-07-31 1981-03-10 Plibrico Company Skid rail insulation member and method of installing same
US4604056A (en) * 1985-03-01 1986-08-05 Jones William R Vacuum furnace system hearth
FR2764368A1 (fr) * 1997-06-06 1998-12-11 Lorraine Laminage Equipement siderurgique a revetement refractaire non fissurant pour le traitement d acier liquide
EP1026466A1 (de) * 1999-02-02 2000-08-09 Plibrico G.m.b.H. Innengekühlter Rohrkörper mit einer Ummantelung aus Feuerbeton und Verfahren zu seiner Herstellung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1753220A (en) * 1929-02-04 1930-04-08 Surface Comb Company Inc Track for use in furnaces
US2693352A (en) * 1950-08-14 1954-11-02 Frederick S Bloom Furnace insulation system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1753220A (en) * 1929-02-04 1930-04-08 Surface Comb Company Inc Track for use in furnaces
US2693352A (en) * 1950-08-14 1954-11-02 Frederick S Bloom Furnace insulation system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3337199A (en) * 1965-07-14 1967-08-22 George B Kirkpatrick Angularly disposed water-cooled skid rails
US3955600A (en) * 1971-06-07 1976-05-11 Bechtel International Corporation Composite pipeline
US3804585A (en) * 1972-07-06 1974-04-16 Urguhart Eng Co Ltd Precast furnace pipe insulation
US3788800A (en) * 1972-11-29 1974-01-29 Salem Corp Rabble for rotary hearth furnace
US4255127A (en) * 1979-07-31 1981-03-10 Plibrico Company Skid rail insulation member and method of installing same
US4604056A (en) * 1985-03-01 1986-08-05 Jones William R Vacuum furnace system hearth
FR2764368A1 (fr) * 1997-06-06 1998-12-11 Lorraine Laminage Equipement siderurgique a revetement refractaire non fissurant pour le traitement d acier liquide
EP1026466A1 (de) * 1999-02-02 2000-08-09 Plibrico G.m.b.H. Innengekühlter Rohrkörper mit einer Ummantelung aus Feuerbeton und Verfahren zu seiner Herstellung

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GB1025260A (en) 1966-04-06
BE626999A (d)
AT259614B (de) 1968-01-25

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