US3924574A - Fluid heater apparatus - Google Patents

Fluid heater apparatus Download PDF

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Publication number
US3924574A
US3924574A US560821A US56082175A US3924574A US 3924574 A US3924574 A US 3924574A US 560821 A US560821 A US 560821A US 56082175 A US56082175 A US 56082175A US 3924574 A US3924574 A US 3924574A
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US
United States
Prior art keywords
furnace space
heating tubes
combustion gases
fluid
burners
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
US560821A
Other languages
English (en)
Inventor
Harold O Ebeling
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.)
Black Sivalls and Bryson Inc
Original Assignee
Black Sivalls and Bryson 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 Black Sivalls and Bryson Inc filed Critical Black Sivalls and Bryson Inc
Priority to US560821A priority Critical patent/US3924574A/en
Priority to AU86050/75A priority patent/AU490058B2/en
Priority to GB43638/75A priority patent/GB1487455A/en
Priority to ZA00756749A priority patent/ZA756749B/xx
Priority to NO753604A priority patent/NO139706C/no
Priority to DE2548540A priority patent/DE2548540C3/de
Priority to IT28925/75A priority patent/IT1045590B/it
Priority to SE7512280A priority patent/SE7512280L/xx
Priority to BE161576A priority patent/BE835240A/xx
Priority to FR7534374A priority patent/FR2304871A1/fr
Priority to AT841975A priority patent/ATA841975A/de
Priority to BR7507274A priority patent/BR7507274A/pt
Priority to NL7513086A priority patent/NL7513086A/xx
Priority to JP50133129A priority patent/JPS51110743A/ja
Application granted granted Critical
Publication of US3924574A publication Critical patent/US3924574A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/06—Baffles or deflectors for air or combustion products; Flame shields in fire-boxes

Definitions

  • ABSTRACT relates to fluid heater apparatus having a firing wall, a back wall and side walls defining a furnace space.
  • a plurality of fluid heating tubes are disposed in the furnace space and one or more high intensity combustion burners are attached to the firing wall and positioned so that combustion gases produced thereby are directed into the furnace space and caused to circulate around the heating tubes.
  • At least one baffle is disposed in the furnace space adjacent to the firing wall defining a secondary chamber in which additional heating tubes are disposed so that combustion gases impinge on the baffle after impinging on the back wall and are caused to recirculate around the heating tubes and then flow through the secondary chamber whereby additional heat is transferred to the fluid being heated.
  • FLUID HEATER APPARATUS BACKGROUND OF THE INVENTION 1.
  • Field of the Invention relates generally to improved fluid heater apparatus, and more particularly, but not by way of limitation, to improved heater apparatus of the type wherein hot combustion gases are caused to circulate around heating tubes disposed within a furnace space.
  • An air blower is utilized with the burners so that the products of combustion formed by the burners are directed into the furnace space under super-atmospheric pressure and caused to be circulated around the heating tubes therein in a manner such that even connection heating of the tubes and the fluid passing therethrough results.
  • an improved fluid heater apparatus of the type described above whereby greater recirculation of the combustion gases within the furnace space and around the heating tubes results and a secondary chamber is provided in the furnace space containing heating tubes over which the combustion gases flow thereby transferring additional heat from the combustion gases to the fluid being heated.
  • the present invention relates to an improved heater apparatus comprising a firing wall, a back wall and side walls defining a furnace space.
  • a plurality of fluid heating tubes are disposed in the furnace space and one or more high intensity combustion burners are attached to the firing wall and positioned so that combustion gases produced by the burners are directed into the furnace space.
  • the combustion gases impinge on the back wall of the furnace space and circulate around the heating tubes.
  • At least one baffle is disposed in the furnace space adjacent to the firing wall defining a secondary chamber therewithin between the firing wall and the baffle so that at least a portion of the combustion gases produced by the burners impinge on the baffle after impinging on the back wall and are caused to recirculate around the heating tubes.
  • At least one stack is attached to a side wall of the furnace space communicated with the secondary chamber so that combustion gases are withdrawn from the furnace space through the secondary chamber.
  • a further object of the present invention is the provision of an improved fluid heater apparatus of the type 2 wherein combustion gases are circulated within a furnace space whereby maximum utilization of the heat content of the combustion gases is realized.
  • Yet a further object of the present invention is the provision of an improved heater apparatus wherein increased recirculation of combustion gases around the heating tubes results.
  • Still another object of the present invention is the provision of an improved heater apparatus including a secondary chamber within the furnace space having fluid heating tubes disposed therein whereby heat contained in the combustion gases normally lost to the stack is transferred to the fluid being heated.
  • FIG. 1 is a side elevational view partly in section, of one form of the improved heater apparatus of the present invention.
  • FIG. 2 is a front elevational view of the heater apparatus of FIG. 1.
  • FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1.
  • FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3.
  • FIG. 5 is a front elevational view taken in cross-section of an alternate form of the improved heater apparatus of the present invention.
  • FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 5.
  • the apparatus 10 is basically comprised of a rectangular firing wall 12, a rectangular back wall 14 and four rectangular side walls 16 forming a furnace space 18.
  • a plurality offluid heating tubes 20 are disposed within the furnace space 18 connected together in a conventional manner by return bends 22.
  • the heating tubes 20 are preferably divided into a pair of tube banks 25 and 27 positioned on opposite sides of the furnace space 18 so that a space free of heating tubes is provided between the firing wall 12 and back wall 14 of the furnace space 18.
  • Each of the tube banks 25 and 27 includes an inlet connection 24 and an outlet connection 26 passing through one of the side walls 16 of the furnace space 18.
  • the heating tubes 20 are positioned within the furnace space 18 parallel to each other and parallel to two opposite side walls 16 ofthe furnace space 18.
  • a pair of high intensity combustion burners 30 are attached to the firing wall 12 positioned on a line intermediate to the side walls 16 which are parallel to the heating tubes 20.
  • the term high intensity combustion burner is used herein to mean any burner apparatus or burner apparatus in combination with one or more air or com bustion gas blowers which is capable of producing hot combustion gases at a relatively high velocity under super-atmospheric pressure.
  • a particularly suitable type of high intensity combustion burner which is preferred for use in accordance with the present invention 3 is described and claimed in US. Pat. No. 3,265,113, assigned to the assignee of this invention.
  • Each of the high intensity combustion burners 30 includes a combustion air inlet 32 connected to a source of combustion air at super-atmospheric pressure such as an atmospheric air blower (not shown), and includes a fuel gas inlet 34 connected to a source of fuel gas.
  • Conventional instruments and controls are provided in association with the burners 30 so that fuel and combustion air are supplied to the burners 30 in a substantially stoichiometric mixture. Substantially complete combustion of the mixture takes place within the burners 30 thereby producing relatively high velocity jets of hot combustion gases which are discharged by the burners 30 into the furnace space 18 in a direction towards the back wall 14 thereof.
  • a pair of baffles 36 are disposed within the furnace space 18 adjacent the firing wall positioned in a plane parallel thereto.
  • Each of the baffles 36 is rectangular in shape and is sealingly attached, such as by welding, at one side and the ends thereof to the side walls 16 forming the furnace space 18.
  • the baffles 36 are positioned on opposite sides of the burners 30 and are of a size such that the inward sides of the baffles 36 terminate short of a line intermediate to the side walls 16 which are parallel to the heating tubes 20 thereby forming a rectangular opening running the length of the furnace space 18 above the burners 30.
  • the baffles 36 form a pair of secondary chambers 38 between the firing wall 12 and the baffles 36 on opposite sides of the burners 30.
  • the lower portions of the tube banks and 27 are disposed within the chambers 38 as best shown in FIG. 3.
  • a pair of stacks 40 for withdrawing spent combustion gases from the furnace space 18 are attached to each of the side walls 16 which are parallel to the heating tubes 20 by way of connections 42 disposed therein.
  • the connections 42 communicate with the secondary chambers 38 so that combustion gases withdrawn from the furnace space 18 are caused to flow through the chambers 58.
  • a pair of elongated concave-convex baffles 44 are disposed within the furnace space 18 and positioned with the concave surfaces thereof facing the heating tubes 20.
  • the baffles 44 are attached to the side walls 16 which are parallel to the heating tubes 20 and to the upper sides of the baffles 36 in a conventional manner such as by welding.
  • the baffles 36 and 44 on each side of the burners can be integrally formed from single metal plates, or a plurality of metal plates can be used as dictated by good manufacturing techniques.
  • FIGS. 5 and 6 an alternate form of the improved fluid heater apparatus of the present invention is illustrated and generally designated by the numeral 50.
  • the apparatus 50 is similar to the apparatus 10 described above, except that the firing wall 52 and the back wall 54 are of circular shape and the side walls are formed of a single cylindrical wall 56 thereby forming a cylindrical furnace space 58.
  • a plurality of circular heating tubes 60 are disposed within the furnace space 58 connected together in a conventional manner to form a pair of helical coils connected in series and having an inlet connection 62 passing through the side wall 56 and an outlet connection 64 passing through the back wall 54.
  • a continuous annular baffle 66 is disposed within the furnace space 58 adjacent to the firing wall 52 in a plane parallel thereto. The baffle 66 is attached at its outer sides to the cylindrical wall 56 such as by welding.
  • a high intensity combustion burner 68 of the type described above is attached to the firing wall 52 at a central position therein so that the opening in the annular baffle 66 is positioned above the discharge of the burner 68.
  • the annular baffle 66 forms a secondary chamber 69 between it and the firing wall 52 within the furnace space 58, and four stacks 70 are connected to the cylindrical side wall 56 by way of connections 72 communicating with the secondary chamber 69.
  • the heating tubes 60 are of a diameter and arranged in a manner so that in cross section, as shown in FIG. 5, the heating tubes are stacked vertically above the annular baffle 66 and a space free of heating tubes is provided between the firing wall 52 and burner 68 and the back wall 54 of the furnace space 58.
  • Several of the heating tubes 60 are disposed within the secondary chamber 69 formed by the baffle 66.
  • An annular concave-convex baffle 76 is provided positioned with the concave surface thereof facing the heating tubes 60 and attached to the side wall 56 and the top side of the annular baffle 66.
  • the combustion gases then change direction and travel downwardly through the space between the baffles 36 and through the secondary chambers 38 wherein they flow over the heating tubes 20 disposed therein.
  • heat is transferred from the combustion gases to the fluid being heated. Because the combustion gases are caused to circulate and recirculate around the heating tubes, substantially even heating thereof takes place resulting in highly efficient heat transfer from the combustion gases to the fluid being heated.
  • the combustion gases flowing through the chambers 38 flow over and around the heating tubes 20 disposed therein giving up additional heat to the fluid being heated.
  • the spent combustion gases are then withdrawn from the chambers 38 and the furnace space 38 by way of the stacks 40 connected thereto.
  • the concave-convex baffles 44 disposed in the furnace space 18 facilitate the smooth change in direction of the combustion gases traveling downwardly and impinging thereon increasing the recirculation of the gases around the heating tubes 20.
  • FIGS. 5 and 6 The operation of the improved fluid heating apparatus 50 illustrated in FIGS. 5 and 6 is similar to that described above for the apparatus 10. That is, a high velocity jet of combustion gases is generated by the burner 68 and directed from the firing wall 52 towards the back wall 54 of the furnace space 58 as shown by the arrows in FIG. 3. The combustion gases impinge against the back wall 54 and circulate around the heating tubes 60 in a generally downward direction within the furnace space 58. Afterimpinging on the back wall 54 at least a portion of the combustion gases impinge on the baffles 66 and 76 and are caused to recirculate around'the heating tubes 60 in a generally upward direction.
  • combustion gases then change direction and flow downwardly around the inner side of the annular baffle 66and over and around the heating tubes 60 disposed in the chamber 69 formed thereby.
  • heat is given up to the fluid being heated flowing within the heating tubes disposed therein and the resultant spent combustion gases are withdrawn from the chamber 69 and the furnace space 58 by way of the stacks 70 attached thereto.
  • the concave-convex baffle 76 facilitates the smooth change in direction of the combustion gases impinging thereon increasing the recirculation of the gases around the heating tubes 60.
  • the heating tubes disposed within the furnace space of the apparatus can be connected in parallel banks, in series or in other flow arrangements as dictated by the conditions of the fluid to be heated and the heat required to be transferred thereto.
  • any number of high intensity combustion burners can be utilized as dictated by the heat release required, etc.
  • more or less stacks than those disclosed can be utilized, and combustion gases can be circulated from adjacent the back wall within the furnace space to a point adjacent the firing wall thereof externally of the furnace space through the use of conduit means and a combustion gas blower.
  • the present invention is well adapted to carry out the objects and attain the ends and advantages mentioned as well as those inherent therein. While presently preferred embodiments of the invention have been described for the purpose of disclosure numerous changes in the details of construction and arrangement of parts can be made which will readily suggest themselves to those skilled in the art.
  • the furnace space of the heater apparatus can be square, rectangular or cylindrical in shape and the heating tubes can be straight, circular, formed into continuous helical coils, etc. Such arrangements are encompassed within the spirit of the invention disclosed herein and the scope of the appended claims.
  • a fluid heater apparatus having a firing wall, a back wall and side walls defining a furnace space, a plurality of fluid heating tubes disposed in said furnace space and one or more high intensity combustion burners attached to said firing wall and positioned so that combustion gases produced by the burners are directed into said furnace space, impinge on said back wall and are caused to circulate around said heating tubes thereby bringing about the transfer of heat from said combustion gases to the fluid being heated, the improvement which comprises:
  • At least one baffle disposed in said furnace space adjacent to said firing wall defining a secondary chamber within said furnace space between said firing wall and said baffle so that at least a portion of said combustion gases produced by said burner 'or burners impinge on said baffle after impinging on 'said back wall and are caused to recirculate 1 around said heating tubes; and v f at leastone stack attached to said walls defining said furnace space and communicating with said secondary chamber so that combustion gases are withdrawn from said furnace space through said secondary chamber.
  • the fluid heater apparatus of claim 1 which is further characterized to include a plurality of fluid heating tubes disposed within said secondary chamber so that combustion gases flowing therethrough flow over and around said heating tubes thereby bringing about the transfer of additional heat from said combustion gases to said fluid being heated.
  • the fluid heater apparatus of claim 2 which is further characterized to include rectangular walls defining said furnace space with the axes of said heating tubes being parallel to each other and to two opposite side walls of said furnace space.
  • the fluid heater apparatus of claim 4 which is further characterized to include a pair of stacks attached to each of said side walls and communicating with said secondary chambers so that combustion gases are withdrawn from said furnace space through said secondary chambers.
  • a fluid heater apparatus having a rectangular firing wall, a rectangular back wall and rectangular side walls defining a furnace space, a plurality of parallel fluid heating tubesdisposed within said furnace space positioned parallel to two opposite sides of said furnace space and one or more high intensity combustion burners attached to said firing wall and positioned on a line intermediate to said opposite side walls of said furnace space parallel to said heating tubes whereby combustion gases produced by said burner or burners are directed into said furnace space, impinge on said back wall and are caused to circulate around said heating tubes thereby bringing about the transfer of heat from said combustion gases to the fluid being heated, the improvement which comprises:
  • each of said baffles being sealingly attached to one of said opposite side walls of said furnace space parallel to said heating tubes thereby defining a pair of secondary chambers on opposite sides of said burner or burners so that at least a portion of said combustion gases produced by said burner or flow over and around said heating tubes thereby bringing about the transfer of additional heat from said combustion gases to said fluid being heated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Tunnel Furnaces (AREA)
  • Resistance Heating (AREA)
US560821A 1975-03-21 1975-03-21 Fluid heater apparatus Expired - Lifetime US3924574A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
US560821A US3924574A (en) 1975-03-21 1975-03-21 Fluid heater apparatus
AU86050/75A AU490058B2 (en) 1975-10-07 Fluid heater apparatus
GB43638/75A GB1487455A (en) 1975-03-21 1975-10-23 Fluid heater apparatus
ZA00756749A ZA756749B (en) 1975-03-21 1975-10-27 Fluid treatment apparatus
NO753604A NO139706C (no) 1975-03-21 1975-10-28 Vaeskeoppvarmingsinnretning.
DE2548540A DE2548540C3 (de) 1975-03-21 1975-10-30 Brennkammer für einen Flüssigkeitserhitzer
IT28925/75A IT1045590B (it) 1975-03-21 1975-10-31 Apparato per il trattamento di fluido
SE7512280A SE7512280L (sv) 1975-03-21 1975-11-03 Vetskevermare
BE161576A BE835240A (fr) 1975-03-21 1975-11-04 Appareil de traitement de fluide
FR7534374A FR2304871A1 (fr) 1975-03-21 1975-11-04 Appareil de traitement de fluide
AT841975A ATA841975A (de) 1975-03-21 1975-11-05 Fluessigkeitserhitzer
BR7507274A BR7507274A (pt) 1975-03-21 1975-11-05 Aperfeicoamento em aparelho aquecedor de fluido
NL7513086A NL7513086A (nl) 1975-03-21 1975-11-07 Fluidumbehandelingsinrichting.
JP50133129A JPS51110743A (no) 1975-03-21 1975-11-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US560821A US3924574A (en) 1975-03-21 1975-03-21 Fluid heater apparatus

Publications (1)

Publication Number Publication Date
US3924574A true US3924574A (en) 1975-12-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US560821A Expired - Lifetime US3924574A (en) 1975-03-21 1975-03-21 Fluid heater apparatus

Country Status (13)

Country Link
US (1) US3924574A (no)
JP (1) JPS51110743A (no)
AT (1) ATA841975A (no)
BE (1) BE835240A (no)
BR (1) BR7507274A (no)
DE (1) DE2548540C3 (no)
FR (1) FR2304871A1 (no)
GB (1) GB1487455A (no)
IT (1) IT1045590B (no)
NL (1) NL7513086A (no)
NO (1) NO139706C (no)
SE (1) SE7512280L (no)
ZA (1) ZA756749B (no)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5980243A (en) * 1999-03-12 1999-11-09 Zeeco, Inc. Flat flame
US6394792B1 (en) 1999-03-11 2002-05-28 Zeeco, Inc. Low NoX burner apparatus
US9593847B1 (en) 2014-03-05 2017-03-14 Zeeco, Inc. Fuel-flexible burner apparatus and method for fired heaters
US9593848B2 (en) 2014-06-09 2017-03-14 Zeeco, Inc. Non-symmetrical low NOx burner apparatus and method
US20180051873A1 (en) * 2015-06-30 2018-02-22 Uop Llc Film temperature optimizer for fired process heaters

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2077899B (en) * 1980-06-17 1983-10-26 Bs & B Eng Co Heater for a process fluid

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430344A (en) * 1944-09-08 1947-11-04 C M Kemp Mfg Company Preheater for oil for refinery crackers
US2993479A (en) * 1958-05-14 1961-07-25 Gibbons Heaters Ltd Fluid heaters
US3216401A (en) * 1963-04-25 1965-11-09 Universal Oil Prod Co Method of heating a fluid stream to minimize fluid film temperatures
US3791350A (en) * 1972-08-03 1974-02-12 Black Sivalls & Bryson Inc Apparatus for heating fluids

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1226801A (fr) * 1958-05-14 1960-08-16 Gibbons Heaters Ltd Perfectionnements apportés aux réchauffeurs pour fluides

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430344A (en) * 1944-09-08 1947-11-04 C M Kemp Mfg Company Preheater for oil for refinery crackers
US2993479A (en) * 1958-05-14 1961-07-25 Gibbons Heaters Ltd Fluid heaters
US3216401A (en) * 1963-04-25 1965-11-09 Universal Oil Prod Co Method of heating a fluid stream to minimize fluid film temperatures
US3791350A (en) * 1972-08-03 1974-02-12 Black Sivalls & Bryson Inc Apparatus for heating fluids

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6394792B1 (en) 1999-03-11 2002-05-28 Zeeco, Inc. Low NoX burner apparatus
US5980243A (en) * 1999-03-12 1999-11-09 Zeeco, Inc. Flat flame
US9593847B1 (en) 2014-03-05 2017-03-14 Zeeco, Inc. Fuel-flexible burner apparatus and method for fired heaters
US9593848B2 (en) 2014-06-09 2017-03-14 Zeeco, Inc. Non-symmetrical low NOx burner apparatus and method
US20180051873A1 (en) * 2015-06-30 2018-02-22 Uop Llc Film temperature optimizer for fired process heaters
US10551053B2 (en) * 2015-06-30 2020-02-04 Uop Llc Film temperature optimizer for fired process heaters
US11105500B2 (en) 2015-06-30 2021-08-31 Uop Llc Film temperature optimizer for fired process heaters

Also Published As

Publication number Publication date
FR2304871A1 (fr) 1976-10-15
DE2548540A1 (de) 1976-09-30
NL7513086A (nl) 1976-09-23
BR7507274A (pt) 1976-09-21
AU8605075A (en) 1977-05-05
IT1045590B (it) 1980-06-10
ZA756749B (en) 1976-10-27
DE2548540C3 (de) 1980-01-03
DE2548540B2 (de) 1979-04-26
NO139706B (no) 1979-01-15
NO139706C (no) 1979-04-25
NO753604L (no) 1976-09-22
JPS51110743A (no) 1976-09-30
SE7512280L (sv) 1976-09-22
BE835240A (fr) 1976-03-01
GB1487455A (en) 1977-09-28
ATA841975A (de) 1979-05-15

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