EP0430601A1 - Isolierungshülse - Google Patents

Isolierungshülse Download PDF

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Publication number
EP0430601A1
EP0430601A1 EP90312775A EP90312775A EP0430601A1 EP 0430601 A1 EP0430601 A1 EP 0430601A1 EP 90312775 A EP90312775 A EP 90312775A EP 90312775 A EP90312775 A EP 90312775A EP 0430601 A1 EP0430601 A1 EP 0430601A1
Authority
EP
European Patent Office
Prior art keywords
layer
pipe
segments
insulation sheath
sheath according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90312775A
Other languages
English (en)
French (fr)
Inventor
Alain Jean-François Ovsec
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.)
Foseco International Ltd
Original Assignee
Foseco International Ltd
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 Foseco International Ltd filed Critical Foseco International Ltd
Publication of EP0430601A1 publication Critical patent/EP0430601A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

  • This invention relates to insulation sheaths and particularly to sheaths suitable for the insulation of tubes, pipes or the like in furnaces.
  • furnaces such as pusher furnaces, walking beam furnaces and the like require water-cooled supports.
  • Such supports which may be in the form of hollow tubes or pipes, require insulation to protect them from the heat and also to reduce the otherwise high heat losses that would be incurred by the cooling effect on the material being treated in the furnace.
  • the insulation is normally provided in the form of one or more layers of sheathing of suitably insulating material which form a jacket or jackets around the tube or pipe to be protected.
  • the present invention aims to provide an improved form of insulating sheathing that gives excellent insulation properties while being designed to provide ease of installation even in the confined regions of the aforesaid types of furnaces.
  • the invention provides an insulation sheath for a pipe, the sheath comprising two layers, the first layer to be in contact with the pipe and being a plurality of separate longitudinal segments abutting adjacent similar segments along the length of the pipe and the second layer being a plurality of separate longitudinal segments fitting snugly over the first layer over a major portion of the circumference of the first layer, the segments of the second layer overlying the joints between the segments of the first layer.
  • the invention is particularly applicable for use in pusher furnaces in which the pipe to be insulated is welded or otherwise attached along its length to a rail or rider of the furnace. Normally the rail or rider will sit on top of the pipe, to which it is attached. It will be appreciated, therefore, that the insulating sheath cannot (and must not) completely encompass the pipe but its ends can abut either side of the rail or rider. It will also be appreciated that the presence of this rail, which together with the pipe may extend for many metres, makes it very difficult to fit layers of refractory sheathing around the pipe.
  • the first layer extends around the entire circumference of the pipe except for the portion where the pipe is in contact with the furnace rail and the second layer extends around and contacts the first layer over the majority of the circumference of the first layer.
  • the second layer is preferably of substantially 'C'-shape transverse section.
  • the present invention enables each segment of the first layer to be applied around the pipe in two longitudinally-divided parts, which can be temporarily held in position.
  • the corresponding one-piece outer, i.e. second, layer segment can then be slid into place over the inner, i.e. first layer, segments or the inner ones slid inside the outer one to hold the inner segment halves in their desired location.
  • the outer layer can readily accommodate and closely contact the inner layer, whereas the opening in the 'C' is too small to allow it to be readily separated from the inner as it would be necessary to prise open the arms of the 'C'.
  • the first layer be in contact with the pipe for the majority of its circumference.
  • the air gap so provided gives useful further insulating properties to the sheath.
  • the pipe may have projections attached to its surface against which the first layer will rest.
  • the second layer may be longitudinally coextensive with the first layer so that a double layer of insulation extends for the full length of the insulated pipe.
  • this may not always be essential and, in another embodiment of the invention, the second layer is in the form of a plurality of segments spaced longitudinally from each other, each segment extending over and covering a joint between a pair of adjacent segments of the first layer.
  • the layers of the insulation may be made of any suitable material that is adequately refractory for the conditions in the furnace location and, of course, that provides the required degree of insulation.
  • the first and second layers are both made of bonded ceramic fibre, e.g. aluminosilicate fibres bonded with colloidal silica and/or colloidal alumina.
  • Figure 1 is a transverse cross-section through a pipe attached to a rail of a pusher furnace which has been insulated in accordance with one embodiment of the invention
  • Figure 2 is a longitudinal section along line II - II of Figure 1;
  • Figure 3 is a section along line III - III of Figure 1. (It will be noted that Figures 1, 2 and 3 are not to scale.)
  • a furnace rail 1 has attached to its underside a pipe 2 to carry coolant, normally water.
  • coolant normally water.
  • At the lower portion of its circumference pipe 2 has fins 3 attached to it.
  • An inner (first) insulation layer 4 is in two halves 4A, 4B that encircle the pipe and abut against the sides of rail 1.
  • 4A and 4B abut each other at a position diametrically across the pipe 2 from rail 1 but only contact the pipe at its circumference immediately adjacent the rail.
  • 4A and 4B also contact fins 3, which latter thereby act as spacers to provide an air gap 5 between layer 4 and the pipe.
  • the two halves 4A and 4B of layer 1 are held in position by C-shaped outer (second) insulating layer 6, which closely contacts layer 4 except for a minor portion of the latter's circumference immediately to each side of rail 1.
  • a fillet 7 of refractory cement may be used to protect the otherwise unsealed joint between the end 8 of each arm of the C-shaped layer 6 and the inner layer 4.
  • This fillet has the advantage of preventing dust and other particulate matter, e.g. iron-based, from entering between the two layers, whereby physical separation and harmful chemical reaction are prevented.
  • Figure 2 can be seen the plurality of inner layer segments 4C and their overlying outer layer segments 6C running along the length of the pipe 2 beneath rail 1. It will be noted that the abutting joint between each adjacent pair of segments 4C is covered by an overlying segment 6C.
  • each outer layer segment 6C are shaped to have a tongue 9 and groove 10 configuration, whereby adjacent segments interlock to provide an effective insulation sheath.
  • the outer layer segments 11 at each end of the span of pipe being insulated are cut or otherwise formed to the appropriate length and stainless steel needles 12 are pushed longitudinally through these end segments to extend into the next adjacent segment to clamp the assembly together, thereby providing a satisfactorily-sheathed pipe.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Insulation (AREA)
EP90312775A 1989-11-30 1990-11-23 Isolierungshülse Withdrawn EP0430601A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8927075 1989-11-30
GB898927075A GB8927075D0 (en) 1989-11-30 1989-11-30 Insulation sheaths

Publications (1)

Publication Number Publication Date
EP0430601A1 true EP0430601A1 (de) 1991-06-05

Family

ID=10667188

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90312775A Withdrawn EP0430601A1 (de) 1989-11-30 1990-11-23 Isolierungshülse

Country Status (2)

Country Link
EP (1) EP0430601A1 (de)
GB (1) GB8927075D0 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436452A (en) * 1943-05-26 1948-02-24 William E Schmidt Water-cooled furnace supporting member
GB796848A (en) * 1956-02-13 1958-06-18 Stein & Atkinson Ltd Improvements relating to skid rails for furnaces
WO1981001451A1 (en) * 1979-11-15 1981-05-28 F Campbell Interlocking truncated triangular insulator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436452A (en) * 1943-05-26 1948-02-24 William E Schmidt Water-cooled furnace supporting member
GB796848A (en) * 1956-02-13 1958-06-18 Stein & Atkinson Ltd Improvements relating to skid rails for furnaces
WO1981001451A1 (en) * 1979-11-15 1981-05-28 F Campbell Interlocking truncated triangular insulator

Also Published As

Publication number Publication date
GB8927075D0 (en) 1990-01-31

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