US3208869A - Fluidized coating of pipe - Google Patents

Fluidized coating of pipe Download PDF

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Publication number
US3208869A
US3208869A US82817A US8281761A US3208869A US 3208869 A US3208869 A US 3208869A US 82817 A US82817 A US 82817A US 8281761 A US8281761 A US 8281761A US 3208869 A US3208869 A US 3208869A
Authority
US
United States
Prior art keywords
pipe
chamber
coating
coating material
dry
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
US82817A
Other languages
English (en)
Inventor
Starr Philip
Theodore H Holt
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.)
Jones and Laughlin Steel Corp
Original Assignee
Jones and Laughlin Steel Corp
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 NL273483D priority Critical patent/NL273483A/xx
Priority to BE612457D priority patent/BE612457A/xx
Application filed by Jones and Laughlin Steel Corp filed Critical Jones and Laughlin Steel Corp
Priority to US82817A priority patent/US3208869A/en
Priority claimed from US8938161 external-priority patent/US3085549A/en
Priority to GB399/62A priority patent/GB986409A/en
Priority to FR884834A priority patent/FR1316009A/fr
Application granted granted Critical
Publication of US3208869A publication Critical patent/US3208869A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/22—Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
    • B05D1/24—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/05—Fluidized bed

Definitions

  • t is another object of our invention to provide process and apparatus for passing an elongated article through a fluidized bed without permitting particles of the bed to escape therefrom.
  • an article to be coated is heated to a temperature somewhat above the melting point of the coating material and is then introduced into a fluidized bed of unheated particles of that material, individual particles of the coating material will adhere to the hot surface of the article and melt thereon so as to fuse with other particles into a continuous coating.
  • the coated article cannot immediately make contact with any supporting means because the hot coating is soft and easily marked or scraped off.
  • the heated article particularly if it is a small diameter metal pipe or tube, has a tendency to sag between supports and this tendency places a limit on the distance between the points of support for the freshly coated pipe.
  • metal pipe must be rapidly cooled or quenched immediately after it is coated if the coating is to be applied progressively.
  • inside cooling or quenching of metal pipe is several times as effective as outside quenching.
  • the means for internally quenching the pipe can be a part of a mandrel over which the pipe passes through the fluidized bed.
  • FIGURE 1 is a schematic elevation of our apparatus.
  • FIGURE 2 is an elevation partly in section of the mandrel and associated apparatus of our invention which defines the path of travel of the pipe through the coating chamber.
  • FIGURE 3 is a plan view of the guide rolls of FIG- URE 2.
  • FIGURE 4 is an elevation in section through a port of our invention.
  • FIGURE 5 is an elevation in section through a port of another design.
  • FIGURE 6 is an elevation partly in section of a portion of our mandrel and quenching apparatus.
  • the coating of the pipe takes place in a tank or chamber 1 having a bottom plate 2 provided with perforations 3-3 smaller in diameter than the particles of the coating material.
  • Chamber 1 below bottom plate 2 is connected to a source of air under low pressure, not shown, through duct 32.
  • the top of chamber 1 is closed by a hood 4 that tapers upwardly and inwardly to an exhaust duct 5 which is connected to a suction fan, not shown.
  • Chamber 1 is provided with entry port 7 and exit port 6 for the pipe to be coated, these ports being positioned opposite each other at a level intermediate bottom plate 2 and hood 4 of chamber It.
  • Ports 6 and 7 are of identical construction, and are shown in detail in FlGURE 4. Each port comprises a tubular inner wall 9 surrounded by a tubular outer wall 8 spaced therefrom. Outer and inner walls 8 and d are connected by a annular wall 19 at their ends which are inside chamber 1 and by an annular Wall 11 at their outer ends. Radial openings ]i2l2 are provided in outer wall 8 near end ii and connect through pipes 3333 to manifold 34 which, through duct 35, Communicates with a source of air under low pressure, not shown.
  • inner wall 9 is provided with inclined annular slots 13l3 extending around substantially the entire circumference of inner wall 9. The slots are inclined toward chamber 1 from outside to inside of inner wall 9. Ports 6 and 7 are positioned in the walls of chamber 1 so that they can be adjusted toward or away from each other along their common longitudinal axis, as is desired.
  • Rolls 15 and 16 have V-grooved surfaces, and are mounted on horizontal axes which are skewed with respect to each other in plan, as is shown in FIG- URE 3.
  • the axes of rolls l5 and 16 are each skewed with respect to the common axis of ports 6 and 7, but in opposite senses. It is known that a pipe passing over a skewed V-grooved roll will be caused to rotate about its own axis thereby.
  • a pipe heating furnace 17 is positioned adjacent roll stand 14.
  • Adjacent exit port 6 and spaced therefrom along the projected common axis of ports 6 and 7 is a conveyor roll 18 which is identical with roll 16 previously described. Roll 18 which is journaled in stand 19 at the same angle of skew as roll 16 is followed by successive conveyor rolls 2tl2tl, spaced from each other along the projected common axis of ports 6 and 7. Rolls 2tl2il are identical with rolls l6 and 18, and together with rolls 16 and 18 provide a path of travel for pipe.
  • a mandrel 21 extends through ports 6 and 7 and into the space between rolls 15 and 16, and in the absence of a pipe is supported by those ports and roll 16.
  • the free end 22 of mandrel 21 is tapered to a rounded point, and is spaced from heating furnace 1'7.
  • Mandrel 21 is of a diameter slightly less than the inside diameter of the pipe to be coated so that the pipe will slide over the mandrel, and is conveniently hollow.
  • Mandrel 21 is attached to rod 23 which through tapered portion 24- is attached to a hollow spray head 25.
  • Spray head 25 is of substantially the same outside diameter as mandrel 21, and is connected to a smaller diameter water pipe 28 spaced therefrom.
  • the annulus 26 which connects spray head 25 with water pipe 28 is a frustum of a shallow cone and is. provided with openings 27-427 circumferentially spaced from each other so as to direct sprays of water against the inside of pipe passing over spray head 25, away from coating chamber 1.
  • Pipe 28, through coupling 29 is connected to water supply pipe 30.
  • pipe 30 At a distance from chamber 1 pipe 30 is supplied with water by means 31 which are rapidly connected to and disconnected from pipe 30.
  • FIGURE 5 An alternative form of port is shown in FIGURE 5. It is similar to that of FIGURE 4, except that inner wall 9 is provided with perforations 3737 smaller in diameter than the particles of the coating material.
  • Dry pulverulent coating material is charged into chamber 1 on bottom plate 2. The charge is adjusted so that its top surface is just below ports 6 and 7. Lengths of pipe to be coated are heated in furnace 17 to a temperature sufficient to sinter the coating material in chamber 1. A heated pipe from furnace 17 is passed between rolls and 16 and over tapered end 22 of mandrel 21 into entry port 7. As the pipe enters port 7 air is introduced into chamber 1 through ducts 32 and 35, and the suction fan connected to duct 5 is started up. Air sweeps into chamber 1 through the space between the pipe and inner Wall 9 of port 7 and the space between mandrel 21 and inner wall 9 of port 6.
  • Air also enters chamber 1 through perforations 3-3 in bottom plate 2. These air streams fluidize the bed of particles of coating material, and cause its upper surface to rise above ports 6 and 7.
  • the heated pipe rotating about its axis, moves through this fluidized bed, over mandrel 21, and becomes coated with particles of the coating material which sinter with each other and fuse together to form a continuous homogeneous coating on the pipe.
  • the distance between roll 16 and roll 18, between which the pipe is unsupported, is small compared with the length of the pipe.
  • the leading end of the pipe, which is cantilevered until it reaches roll 18, is more than counterbalanced by the remainder of the pipe in the heating furnace 17, and is stiffened by mandrel 21 which initially is colder than the pipe.
  • the hot coating therefore does not scrape against port 6, and is hardened by spray 25 before it reaches roll 18.
  • the process of providing pipe with a homogeneous sintered coating formed from dry, pulverulent solid material comprising heating the pipe to a temperature above the sintering temperature of the coating material, moving the heated pipe axially along a horizontal path through a closed chamber containing a bed of dry, pulverulent solid coating material the upper surface of which is below the pipe, rotating the pipe about its axis during its movement through the chamber, introducing a fluidizing gas into the bottom of the bed at a pressure suflicient to fluidize the bed and cause its free surface to rise above the pipe, whereby a uniform homogeneous layer of coating material is progressively formed on the pipe, and introducing fluidizing gas into the chamber around the pipe at a pressure suflicient to prevent the escape of the pulverulent coating material.
  • Apparatus for providing pipe with a homogeneous sintered coating formed from dry, pulverulent solid mate rial comprising a closed chamber adapted to contain a bed of the dry, pulverulent solid material, a bottom for the chamber provided with means for introducing a gas to fluidize the bed of the dry, pulverulent solid material, entry and exit ports in opposite sides of the chamber intermediate the top and bottom thereof aligned to provide a horizontal path of travel for pipe through the chamber, means for moving the pipe along the horizontal path of travel through the chamber and for rotating the pipe about its axis, and a mandrel positioned along the path of travel away from the chamber and extending through the exit port into the entry port so that the pipe passes over the mandrel as it passes through the chamber.
  • entry and exit ports are double-walled sleeves provided with channels from outside to inside of the sleeve inner wall inclined toward the chamber, and including means for introducing fluidizing gas into the space between the sleeve inner and outer walls.
  • entry and exit ports are double-walled sleeves, the inner wall being provided with a plurality of openings smaller in diameter than the particles of the pulverulent solid material.
  • Apparatus of claim 6 including a cooling fluid conduit positioned along the path of travel and connected to the mandrel, a nozzle at the connected end of the conduit provided with channels from inside to outside of the nozzle inclined away from the mandrel, and means for introducing cooling fluid under pressure into the conduit.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Glanulating (AREA)
  • Spray Control Apparatus (AREA)
US82817A 1961-01-16 1961-01-16 Fluidized coating of pipe Expired - Lifetime US3208869A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL273483D NL273483A (de) 1961-01-16
BE612457D BE612457A (de) 1961-01-16
US82817A US3208869A (en) 1961-01-16 1961-01-16 Fluidized coating of pipe
GB399/62A GB986409A (en) 1961-01-16 1962-01-04 Improvements in or relating to the coating of pipes
FR884834A FR1316009A (fr) 1961-01-16 1962-01-15 Procédé et appareil pour appliquer un revêtement sur un tuyau

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82817A US3208869A (en) 1961-01-16 1961-01-16 Fluidized coating of pipe
US8938161 US3085549A (en) 1961-02-15 1961-02-15 Apparatus for introducing fluids into pipes

Publications (1)

Publication Number Publication Date
US3208869A true US3208869A (en) 1965-09-28

Family

ID=26767892

Family Applications (1)

Application Number Title Priority Date Filing Date
US82817A Expired - Lifetime US3208869A (en) 1961-01-16 1961-01-16 Fluidized coating of pipe

Country Status (4)

Country Link
US (1) US3208869A (de)
BE (1) BE612457A (de)
GB (1) GB986409A (de)
NL (1) NL273483A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396699A (en) * 1966-10-21 1968-08-13 Anaconda Wire & Cable Co Continuous coating apparatus
US3409456A (en) * 1963-12-04 1968-11-05 Mansfield Sanitary Inc Method and apparatus for dusting mold cores
US3411933A (en) * 1967-03-30 1968-11-19 Nat Distillers Chem Corp Method for coating pipe
US3459578A (en) * 1964-10-21 1969-08-05 Rhone Poulenc Sa Method of coating bodies by rotation
US3476081A (en) * 1964-03-25 1969-11-04 United States Steel Corp Fluidizing chamber
US3687104A (en) * 1970-11-27 1972-08-29 Amp Inc Strip processing apparatus having air locks between tanks
US3869300A (en) * 1970-10-24 1975-03-04 Metallgesellschaft Ag Method of internally coating ducts with synthetic resin
US3895126A (en) * 1973-05-24 1975-07-15 Indian Head Inc Resin bottle cladding system
US3946125A (en) * 1970-10-24 1976-03-23 Metallgesellschaft Aktiengesellschaft Method for internally coating ducts with synthetic resin
US4089998A (en) * 1976-07-13 1978-05-16 Gibson Jack Edward Method of powder coating the interior of tubular goods
USRE32921E (en) * 1976-07-13 1989-05-09 GCB, Inc. Method of powder coating the inside of pipes with a continuous film of plastic material
US6019845A (en) * 1998-04-23 2000-02-01 Nakakoshi; Senkichi Method for coating inner surfaces of metal tubes with powdery paint and apparatus therefor

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US610224A (en) * 1898-09-06 Composite pipe
US2287825A (en) * 1938-07-30 1942-06-30 Standard Oil Co California Apparatus for cooling coated pipe
GB700177A (en) * 1950-08-31 1953-11-25 Telegraph Constr & Main Co Coating metal-sheathed cables with plastic material
GB833181A (en) * 1957-08-06 1960-04-21 Polymer Corp Method and apparatus for coating metal articles
GB838739A (en) * 1956-12-04 1960-06-22 Albano Albano Muller Improvements in or relating to production of plastic coatings by the hot whirling process
US2945258A (en) * 1958-04-22 1960-07-19 Koppers Co Inc Apparatus for producing plastic material
US2970950A (en) * 1958-01-22 1961-02-07 Benteler Corp Method and apparatus for the continuous galvanization of the inner surface of tubes
US3004861A (en) * 1956-01-12 1961-10-17 Polymer Corp Methods and apparatus for applying protective coatings
US3016875A (en) * 1958-12-11 1962-01-16 United States Steel Corp Apparatus for coating pipe
US3108022A (en) * 1960-05-09 1963-10-22 Polymer Processes Inc Apparatus for coating an elongate body with fluidized coating material

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US610224A (en) * 1898-09-06 Composite pipe
US2287825A (en) * 1938-07-30 1942-06-30 Standard Oil Co California Apparatus for cooling coated pipe
GB700177A (en) * 1950-08-31 1953-11-25 Telegraph Constr & Main Co Coating metal-sheathed cables with plastic material
US3004861A (en) * 1956-01-12 1961-10-17 Polymer Corp Methods and apparatus for applying protective coatings
GB838739A (en) * 1956-12-04 1960-06-22 Albano Albano Muller Improvements in or relating to production of plastic coatings by the hot whirling process
GB833181A (en) * 1957-08-06 1960-04-21 Polymer Corp Method and apparatus for coating metal articles
US2970950A (en) * 1958-01-22 1961-02-07 Benteler Corp Method and apparatus for the continuous galvanization of the inner surface of tubes
US2945258A (en) * 1958-04-22 1960-07-19 Koppers Co Inc Apparatus for producing plastic material
US3016875A (en) * 1958-12-11 1962-01-16 United States Steel Corp Apparatus for coating pipe
US3108022A (en) * 1960-05-09 1963-10-22 Polymer Processes Inc Apparatus for coating an elongate body with fluidized coating material

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3409456A (en) * 1963-12-04 1968-11-05 Mansfield Sanitary Inc Method and apparatus for dusting mold cores
US3476081A (en) * 1964-03-25 1969-11-04 United States Steel Corp Fluidizing chamber
US3459578A (en) * 1964-10-21 1969-08-05 Rhone Poulenc Sa Method of coating bodies by rotation
US3396699A (en) * 1966-10-21 1968-08-13 Anaconda Wire & Cable Co Continuous coating apparatus
US3411933A (en) * 1967-03-30 1968-11-19 Nat Distillers Chem Corp Method for coating pipe
US3869300A (en) * 1970-10-24 1975-03-04 Metallgesellschaft Ag Method of internally coating ducts with synthetic resin
US3946125A (en) * 1970-10-24 1976-03-23 Metallgesellschaft Aktiengesellschaft Method for internally coating ducts with synthetic resin
US3687104A (en) * 1970-11-27 1972-08-29 Amp Inc Strip processing apparatus having air locks between tanks
US3895126A (en) * 1973-05-24 1975-07-15 Indian Head Inc Resin bottle cladding system
US4089998A (en) * 1976-07-13 1978-05-16 Gibson Jack Edward Method of powder coating the interior of tubular goods
USRE32921E (en) * 1976-07-13 1989-05-09 GCB, Inc. Method of powder coating the inside of pipes with a continuous film of plastic material
US6019845A (en) * 1998-04-23 2000-02-01 Nakakoshi; Senkichi Method for coating inner surfaces of metal tubes with powdery paint and apparatus therefor

Also Published As

Publication number Publication date
NL273483A (de)
BE612457A (de)
GB986409A (en) 1965-03-17

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