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US2859737A - Tube supporting provisions for a vapor generating unit - Google Patents

Tube supporting provisions for a vapor generating unit Download PDF

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Publication number
US2859737A
US2859737A US374301A US37430153A US2859737A US 2859737 A US2859737 A US 2859737A US 374301 A US374301 A US 374301A US 37430153 A US37430153 A US 37430153A US 2859737 A US2859737 A US 2859737A
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US
United States
Prior art keywords
tubes
tube
superheater
support
portions
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
US374301A
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English (en)
Inventor
John J Banker
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.)
Babcock and Wilcox Co
Original Assignee
Babcock and Wilcox Co
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
Priority to BE531109D priority Critical patent/BE531109A/xx
Application filed by Babcock and Wilcox Co filed Critical Babcock and Wilcox Co
Priority to US374301A priority patent/US2859737A/en
Application granted granted Critical
Publication of US2859737A publication Critical patent/US2859737A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/202—Suspension and securing arrangements for contact heating surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor

Definitions

  • the present invention relates to the construction and operation of vapor generating and superheating units, and more particularly, to water tube steam boilers of the two drum type in whichL the steam superheating surface is formed by a group of horizontally extending looped tubes located within a cavity deiined by an upright bank of steam generating tubes connecting the vertically spaced horizontally arranged drums.
  • the steam superheating tubes are usually horizontally arranged U-shaped tubes with the tube ends connected to vertical headers and the leg and loop portions of the tubes supported from supporting members attached to one or more large diameter steam generating tubes located between the tube legs in the superheater cavity.
  • These large diameter steam generating tubes and superheater tubes have previously been arranged in the cavity in locations which have not permitted access to the tubes or tube supports within the cavity.
  • the superheater tubes, and the supporting elements for these tubes are subjected to high velocity, high temperature heating gases which contain corrosive constituents which tend to damage these parts.
  • the main object of my invention is the provision of a vapor generating and superheating unit of the character described with an improved construction of the supporting provisions for vapor superheating tubes within a superheater cavity in a vapor generating tube bank whereby the superheating tubes and the supports therefor are accessible and readily replaceable.
  • a further and more specific object is the provision of a two drum marine steam boiier of the character described with an improved construction of the supporting provisions for steam superheating tubes extending horizontally in a superheater cavity of an upright steam generating tube bank whereby all the superheating tubes and the supports therefor are accessible for cleaning or replacement and whereby individual tubes may be readily replaced without damage to the remaining tubes or supports.
  • a still further object is the provision of a marine steam boiler of the character described with an improved construction, arrangement' and support of looped steam v superheater tubes in a tube bank cavity permitting the use of superheater headers of circular cross-section externally of said cavity with a radial connection of all of the superheater tubes to the headers, and atiording cornplete access to the portions of the headers surrounding the tube ends.
  • Fig. l is a sectional elevation of a marine two-drum water tube steam boiler constructed in accordance with my invention
  • Fig. 2 is a sectional plan view taken on the line 2--2 of Fig. l;
  • Fig. 3 is a detailed fragmentary elevation partly in section showing the superheater tube supporting provisions at positions A, B and C in Fig. 1;
  • Fig. 4 is a horizontal sectional View taken on the line 4 4 of Fig. l;
  • Fig. 4A is a horizontal sectional view taken on the line 4a-4a ⁇ of Fig. l;
  • Fig. 5 is an isometric View showing the upper portion of the spacer and support casting
  • Fig. 5A is an isometric view showing the lower portion of the casting of Fig. 5;
  • Fig. 6 is an isometric View showing the upper portion of the lattice or bridge support casting
  • Fig. 7 is a vertical section taken on the line 7-7 of Fig. 3;
  • Fig. 8 is a vertical section taken on the line 8 8 of Fig. 3;
  • Fig. 9 is a vertical section taken on the line 9-9 of Fig. 3.
  • Fig. l0 is ⁇ a fragmentary end view showing the superheater tubes in a sprung position prior to placement in the supporting brackets.
  • the marine steam generating unit illustrated comprises a double-walled casing 2t) having an outer front Wall 21, an outer rear wall 22, side walls 23, 24 and a roof 25. Within the casing 2d are inner front and rear walls 25 and 27, which with an inner side wall 26 and a oor 34 aid in deiining a furnace chamber 29.
  • the unit is tired by a plurality of Huid fuel burners 32 arranged to discharge through burner ports 33 in the inner front wall 25.
  • the iluid heating section of the unit comprises an upper steam and water drum 35 and a laterally ⁇ oifset lower water drum 36, both of which are horizontally arranged.
  • the steam and water drum is arranged closer to the furnace chamber wall 20 than the lower drum,
  • the entire unit is bottom supported, as indicated in Fig. l, the upper drum being supported on therlower drum through a bank of inclined steam generating tubes 37 having their opposite ends bent and radially, connected to the corresponding drums.
  • Two rows of larger diameter staggered water tubes 37a nea-rest the furnace chamber 29 are bent laterally to form a Water tube screen separating the furnace chamber 29 from a vertically elongated superheater cavity 30 which extends the full length of the tube bank.
  • the steam generating surface of the unit also includes tubes 46 extending from a lower header 45 along the side wall 26 and an inner roof 44 to the drum 35; and rear wall tubes 47 extending between upper and lower rearl wall headers 4.3 and 48 which in turn are connected to the drums 35 and 36 respectively.
  • Downcomer tubes 57, 58 and 6l connect the water spaces in the upper and lower drums 35 and 36; downcomer tubes 59 connect the water space in the drum 35 to the rear wall header 48; and downcomer tubes 52 and 60 connect lthe water space in the drum 35 to the side wall header 45.
  • the do'wiicomers are all disposed in the spaces between the end walls and the casing.
  • an economizer formed by laterall as shown in Fig. 1. inner surface shaped to fit the support tubes to which they ly spaced vertical platens of multi-looped horizontally arranged tubes 41 having their upper ends connected to an inlet header 31 and their lower ends connected to a outlet header 40.
  • the steam superheatng section of the unit comprises inclined rows of horizontally extending nested U-shaped tubes 42 positioned in the superheater cavity 3i) between the main bank of steam generating tubes 37 and the screen tubes 37a.
  • each superheater tube row consists of three nested U-shaped tubes with the legs of the innermost tube 42a spaced apart suiciently, for example 13%, to permit a man to walk therebetween for inspection or repairs.
  • a middle tube 42h is arranged around the inner loop and an outer tube 42C is arranged around the middle tube. The looped ends of the outer tubes 42e are slightly spaced from the front wall 25.
  • the ends of all -of the tubes 42 are bent laterally and outwardly for connection into cylindrical headers 49, 50 and 51.
  • the header 49 is arranged in end-to-end relation with the header 50 and the header 51 laterally spaced therefrom. These headers are arranged at an angle from the vertical and spaced from the outer side of rear wall 27.
  • the tube end and header arrangement is such that each tube end can be radially connected to the corresponding cylindrical header and yet leave suicient accessible header area between the tube ends to permit the tube ends to be readily inspected, repaired or replaced.
  • Steam to be superheated enters through an inlet 55 in the upper header 49 and ows through the connected tubes 42 to the header 51 and thence back through the remaining tubes 42 to the lower header 50, discharging through the superheated steam outlet 56.
  • the header end portions of the tubes 42 pass through sections of the rear wall 27 formed by removable insulation 27a, between which is positioned a door or removable panel 53 for access to the superheater cavity.
  • a corresponding removable panel 53a is located in the casing rear Wall, 22.
  • the casing front wall 21 has a still wider removable panel 54a.
  • the inclined headers 49, 50 and 51 in the rear of the unit and the fuel burners 32 in the front wall 25 are enclosed by the outer paneled casing 20. Combustion air is passed downwardly under pressure through the double walls of the unit to the burner ports 33.
  • the headers 49 and 50 and the header 51 and associated tubes 42 are substantially coextensive with the height of the cavity 30.
  • the superheater tubes are supported so as to remain in their designed nested and spaced relation during operation and yet can be readily removed when replacement is necessary.
  • four pairs of large diameter laterally spaced water tubes 38a, 38b, 39a, 39h disposed between the drums 35 and 36 are arranged at staggered spaced intervals in the superheater cavity 30 to provide means for attaching thereto supporting provisions for the superheater tubes.
  • These water tubes are arranged in pairs so that one leg portion of each U-shaped superheater tube 42 will tit in between the pairs of tubes 38a and 38b, and the opposite leg portion between the pairs of tubes 39a and 39h.
  • the number of pairs of water tubes used depends on the size and length of superheater tubes to be supported. In the unit illustrated four pairs of support tubes are suicient.
  • the superheater tube supporting provisions include a plurality of brackets 62 which are secured to the inwardly facing side of corresponding tubes 38a and 38b at corresponding vertically spaced intervals along their height from positions C up to A
  • the brackets 62 have a concave 4 are preferably attached by means of seam welds 63.
  • the brackets are symmetrically arranged relative to the tube axis and have a width less than the tube diameter.
  • the brackets are of U-shaped transverse cross-section and corresponding brackets on each pair of tubes 38a and 38b or 39a and 39b are arranged to face each other. With the back portion fitting the tube vertically, as shown in Fig.
  • each of the U-shaped bracket portions has an inner edge contour consisting of a lower vertical portion 62a, a supcrjacent curved recessed portion 6211, curved like a superheater tube wall, an inclined straight portion 62C which extends out to the plane of the vertical portion 62a and is tangent to the curved portion 62h, a vertical portion 62d above the tangential portion 62C, and a top curved recessed portion 62e above the portion 62d.
  • the brackets are arranged on the water tubes so that the bracket recesses 6211 and 62e of opposite tubes 38a and b, or 39a and 3911, are laterally aligned.
  • the supporting provisions also include metallic spacer or support castings 64 and lattice or bridge castings 65, as shown in Figs. 5, 5u, and 6.
  • Each support casting 64 is of rectangular shape and low height with rounded opposite end portions 64d shaped to t into corresponding bracket recesses 62b or 62e on opposite support tubes'.
  • the upper surface has a rectangular recessed portion 64a extending between the rounded ends to receive and hold a bridge casting 65 therein, and has spaced bolt holes 64b and 64e at one side of said recess.
  • the bottom of each casting 64 also has a rectangular recessed portion 64e extending to one side edge and deep enough to receive the projecting portions of the bridge casting 65.
  • Each bridge casting 65 is of a width permitting it to t in between the U-shaped portions of corresponding brackets 62 of opposite support tubes and has semi-circular recessed portions 65a and 65b centrally located in its top and bottom respectively and outwardly tapering tube wedging portions 65C and 65d on the top and bottom respectively of each end.
  • the superheater tubes 42 are installed by iirst sliding a support casting 64 into the recessed portions 62b of corresponding brackets 62.
  • Fig. 3 shows in detail the superheater tube supporting arrangement for the support tubes 38a and 38b at positions A, B and C in Fig, 1. A similar arrangement is used on support tubes 39a and 39h except for no spacing such as that at position B.
  • the bridge casting 65 is then placed between the U-shaped portions of the bracket and into the recessed portion 64a of the casting 64.
  • the superheater tubes are sprung or pressed together, in a row of three tubes or in groups of six, as shown in Fig.
  • -a bridge casting 65 is rst placed over the top row of tubes as described, and a first support casting 64 is reversed and placed over it so that recess 64a fits over the casting 65.
  • a second bridge casting 65 ts' into the recessed portion 64e of the iirst support casting 64.
  • a second support casting 64 is placed on the second bridge casting 65 in reversed upright position so that the bottom recessed portion 64e rests on the second bridge casting 65.
  • a third bridge casting 65 is then placed in the top recess 64a of the second support casting 64. This arrangement provides an interlocking of the intervening support castings and the desired spacing between tube rows along tubes 38a and 3817.
  • a bridge casting 65 is placed over the top row in between bracket U-shaped portions.
  • a support casting 64 isv then pushed into the recesses 62b sliding over the projections on the bridge casting 65fas shown by position A in Figs. 3 and 7.
  • bolts 66 are inserted throughthe holes 64b ⁇ and 64C.
  • a cotter pin is then pushed through a hole 67 in the bolt shank thereby locking the whole series of tube rows in place.
  • collars are assembled at the top and bottom portions of corresponding tube pairs adjacent positions A and C. As shown in Figs. 4 and 4A, these collars comprise U-shaped curved pieces 63 which t around the outside of adjacent tubes and straight connecting side pieces 69 which are welded to the curved pieces'. On the vfurnace chamber side of each collar piece 68 on tubes 38b and 39h, rods 70 are welded to provide anchoring means for a high temperature refractory covering 71, such as an initially plastic chrome ore.
  • a high temperature refractory covering 71 such as an initially plastic chrome ore.
  • This chrome ore refractory protects the collar parts and is applied at each collar around the curved collar pieces 63 of the tubes 38h, as shown in Fig. 4, and also between the screen tubes 37a and around the curved collar'pieces 68 on the tubes 39b, as shown in Fig. 4A.
  • the panels or doors 53 and 53a are opened to permit a workman to enter the space 30 and inspect the superheater tubes and associated supporting elements.
  • a workman is also aitorded complete accessibility to all parts of the headers 49, 50, 51.
  • the tube support brackets 62 being welded on the inside faces of the supporting tubes out of thedirect path of the oncoming hot gases, arecooled-by the heat absorbing action of the associated supporting tubes so that they usually do not require replacement in ordinary operation.
  • the castings 64 and 65 which'are relatively inexpensive, are usually :subject to more rapid deterioration from the high temperatures and corrosive action of the furnace heating gases and may require replacement.
  • any of the tubes 42 require removal, they are cut away at their connections tothe headers 49 or 50 and 51, removed from their supports and takenr out through the door panels 54 and 54a in the front wall 25 and casing wall 2l. To do this, the top casting 64 and locking bolts 66 are irst removed. The subjacent tu-bes are then sprung together and raised row by row by a block and fall, and each succeeding bridge casting 65 is removed, until the affected tube row is reached. Although the affected tube must be pulled out through the front end of the unit, either or both of the inner tubes 42a and 42b of the superheater can be removed without rst removing tube 42C.
  • a vapor generating and superheating unit comprising walls defining a setting, an upper horizontally extending liquid and vapor drum, a lower horizontally extending liquid drum, a bank of vapor generating tubes connecting said drums, one o-r more rows of vapor generating screen tubes having their ends connected to said drums and spaced laterally from said tube bank to form a superheater cavity therebetween, a plurality of laterally spaced vertically extending headers at one end of said unit externally of said walls, access means in said walls permitting access to said cavity, a vertical bank of nested looped vapor superheater tubes horizontally arranged in n said cavity, said superheater tubes having their opposite ends connected to said headers, a plurality of superheater support tubes arranged in pairs on opposite sides of corresponding superheater tube leg portions, a plurality of brackets attached to the inner side of each pair of said support tubes, said brackets having recessed edge portions arranged to receive said superheater tube leg portions, a
  • An apparatus for supporting horizontally disposed nested U-shaped superheater tubes between vertically arranged pairs of vapor generating tubes comprising oppositely arranged U-shaped brackets for vertically spaced attachment to the adjacent sides of each said generating tubes in a pair having curved back portions that iit around corresponding generating tubes and parallel projecting portions each having an edge contour comprising horizontally aligned vertically spaced curved recesses thereon, a bridge member shaped to span the space between U- shaped inner portions of oppo-sitely facing brackets on each of said generating tubes of a pair, said bridge member having wedge shaped upper and lower portions near each end shaped to bias the outer tubes of said nested superheater tubes in said bracket recesses, and having one or more curved recesses shaped to position the inner tubes of the nested superheater tubes therein.
  • a vapor superheater tube support bridge member having a horizontally elongated body portion of substantially rectangular transverse vertical cross-section, symmetrically arranged end portions of lesser height having substantially flat imperforate top and bottom surfaces and curved end surfaces, one or more inclined portions connecting each end portion to said body portion adapted to space and support the tubes and one or more curved tube receiving recessed portions in said body portion.
  • a vapor superheater tube support bridge member having a horizontally elongated body portion of substantially rectangular transverse vertical cross-section, symmetrically arranged end portio-ns of lesser height having at imperforate top and bottom surfaces and curved end surfaces, outwardly sloping inclined portions connecting each end portion to said body portion adapted to space and support the tubes and one or more curved tube receiving recessed portions in the top and bottom surfaces of said body portion.
  • a vapor generating and superheating unit comprising walls including a pair of oppositely arranged walls defining a furnace chamber section and an adjacent vapor generating and vapor heating section, a lower horizontally extending liquid drum, an upper horizontally extending liquid and vapor drum, a bank of vapor generating tubes including one or more rows of screen tubes connecting said drums, fuel burning means for said furnace chamber, a heating gas outlet at the opposite side of said tube bank from said furnace chamber, a superheater cavity arranged in between said screen and vapor generating tubes of said tube bank and defined by said upper and lower drums and said pair of oppositely arranged walls, a plurality of laterally spaced superheater headers at one end of said unit externally of one of said pair of walls, access means in at least one of said pair of walls permitting access to said superheater cavity, a vertical bank of rows of nested U-shaped vapor superheater tubes horizontally arranged in said superheater cavity and having the inside tube legs of each tube row spaced sufficiently to form
  • a vapor generating and superheating unit comprising an upper horizontally extending liquid and vapor drum, a lower horizontally extending liquid drum, a
  • bank of Vapor generating tubes connecting said drums, walls including a pair of oppositely arranged walls defning a furnace chamber section and a vapor generating and vapor heating section adjacent thereto, one or more rows of vapor generating screen tubes having their ends connected to said drums and extending laterally at their intervening portions into said furnace chamber section, fuel burning means at one end of said furnace chamber, a heating gas outlet at the opposite side of said tube bank from said furnace chamber, a plurality of laterally spaced upwardly extending headers at one end of said unit externally of one of said pair of walls, a superheater cavity defined by said generating tubes and said generating screen tubes, said upper and lower drum, and said pair of oppositely arranged walls, access means in each of said pair of Walls at a position between said generating tubes and said generating screen tubes permitting access to said cavity, a vertical bank of nested looped vapor superheater tubes horizontally arranged in said cavity, said superheater tubes having their opposite ends connected to said headers,
  • An apparatus for supporting horizontally arranged rows of nested superheater tubes between vertically arranged pairs of support vapor generating tubes comprising U-shaped brackets attached to adjacent inner sides of each of said support tubes having curved back portions fitting the support tubes and projecting portions each having a plurality of curved recesses thereon arranged to maintain superheater tubes vertically spaced, and av bridge member between projecting portions of corresponding brackets having wedge-shaped upper and lower portions near each end shaped to bias the outer tubes of said nested tubes in said bracket recesses, and having curved recesses shaped to position the inner tubes of the nested superheater tubes therein.
  • a member for use as a component of an assembly for supporting a vapor superheater tube said member being of rectangular shape and shallow depth and having at least one pair of opposite convexly curved side edges of a diameter of the superheater tube and at least one large face having a substantially rectangular recess formed in the surface thereof.
  • a member for use as a component of an assembly for supporting a vapor superheater tube said member being of rectangular shape and shallow depth and having at least one pair of opposite convexly curved side edges of a diameter of the superheater tube and top and bottom faces having substantially rectangular recesses formed in the surfaces thereof.
  • a member for use as a component of an assembly for supporting a vapor superheater tube said member being of rectangular shape and shallow depth and having a pair of opposite convexly curved side edges of a diameter of the superheater tube and the top and bottom faces having substantially rectangular recesses formed in the surfaces thereof and at least one of said recesses extending out to one of the remaining edges.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US374301A 1953-08-14 1953-08-14 Tube supporting provisions for a vapor generating unit Expired - Lifetime US2859737A (en)

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Application Number Priority Date Filing Date Title
BE531109D BE531109A (da) 1953-08-14
US374301A US2859737A (en) 1953-08-14 1953-08-14 Tube supporting provisions for a vapor generating unit

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012548A (en) * 1959-07-10 1961-12-12 Guszmann Max Boiler
US3164137A (en) * 1962-07-05 1965-01-05 Combustion Eng Shielding of tube support for furnace tube panels
US4100889A (en) * 1977-04-07 1978-07-18 Combustion Engineering, Inc. Band type tube support
US20110146598A1 (en) * 2009-12-22 2011-06-23 Alstom Technology Ltd. Cuff for boiler tube assembly and method of manufacture

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US770278A (en) * 1904-05-14 1904-09-20 John R Fletcher Insulation-rack.
US1133976A (en) * 1913-11-12 1915-03-30 James Kraus Cable-rack.
US1355326A (en) * 1919-09-30 1920-10-12 Harriet L Galbraith Sadiron-support
US1475924A (en) * 1921-01-24 1923-11-27 Power Specialty Co Superheater
US1905596A (en) * 1931-04-06 1933-04-25 Lloyd L Lewis Stanchion
FR771052A (fr) * 1933-06-22 1934-09-29 Cie Des Surchauffeurs Chaudière à tubes d'eau comportant un surchauffeur
GB443503A (en) * 1934-09-19 1936-03-02 Percy Geikie Donald Improvements relating to rain water pipes or the like
US2420647A (en) * 1942-07-08 1947-05-20 Babcock & Wilcox Co Vapor generator
GB609674A (en) * 1946-03-20 1948-10-05 Babcock & Wilcox Ltd Improvements in or relating to tubulous vapour generating and heating units
US2501147A (en) * 1946-04-17 1950-03-21 Warren Webster & Co Radiator bracket
FR993994A (fr) * 1944-12-01 1951-11-09 Evr Eclairage Vehicules Rail Perfectionnements aux barrières démontables

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US770278A (en) * 1904-05-14 1904-09-20 John R Fletcher Insulation-rack.
US1133976A (en) * 1913-11-12 1915-03-30 James Kraus Cable-rack.
US1355326A (en) * 1919-09-30 1920-10-12 Harriet L Galbraith Sadiron-support
US1475924A (en) * 1921-01-24 1923-11-27 Power Specialty Co Superheater
US1905596A (en) * 1931-04-06 1933-04-25 Lloyd L Lewis Stanchion
FR771052A (fr) * 1933-06-22 1934-09-29 Cie Des Surchauffeurs Chaudière à tubes d'eau comportant un surchauffeur
GB443503A (en) * 1934-09-19 1936-03-02 Percy Geikie Donald Improvements relating to rain water pipes or the like
US2420647A (en) * 1942-07-08 1947-05-20 Babcock & Wilcox Co Vapor generator
FR993994A (fr) * 1944-12-01 1951-11-09 Evr Eclairage Vehicules Rail Perfectionnements aux barrières démontables
GB609674A (en) * 1946-03-20 1948-10-05 Babcock & Wilcox Ltd Improvements in or relating to tubulous vapour generating and heating units
US2501147A (en) * 1946-04-17 1950-03-21 Warren Webster & Co Radiator bracket

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012548A (en) * 1959-07-10 1961-12-12 Guszmann Max Boiler
US3164137A (en) * 1962-07-05 1965-01-05 Combustion Eng Shielding of tube support for furnace tube panels
US4100889A (en) * 1977-04-07 1978-07-18 Combustion Engineering, Inc. Band type tube support
US20110146598A1 (en) * 2009-12-22 2011-06-23 Alstom Technology Ltd. Cuff for boiler tube assembly and method of manufacture

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