EP0037929A1 - Verfahren und Vorrichtung zur Beschichtung von Rohren - Google Patents

Verfahren und Vorrichtung zur Beschichtung von Rohren Download PDF

Info

Publication number
EP0037929A1
EP0037929A1 EP81102186A EP81102186A EP0037929A1 EP 0037929 A1 EP0037929 A1 EP 0037929A1 EP 81102186 A EP81102186 A EP 81102186A EP 81102186 A EP81102186 A EP 81102186A EP 0037929 A1 EP0037929 A1 EP 0037929A1
Authority
EP
European Patent Office
Prior art keywords
tube
tank
vacuum
charge
placing
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.)
Granted
Application number
EP81102186A
Other languages
English (en)
French (fr)
Other versions
EP0037929B1 (de
Inventor
David Allan Warren
Edwin Donald Mccrory, Jr.
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.)
Cessione vetco Service Inc
Original Assignee
Vetco 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 Vetco Inc filed Critical Vetco Inc
Publication of EP0037929A1 publication Critical patent/EP0037929A1/de
Application granted granted Critical
Publication of EP0037929B1 publication Critical patent/EP0037929B1/de
Expired legal-status Critical Current

Links

Images

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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
    • 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
    • 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
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0493—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases using vacuum

Definitions

  • This invention relates to the internal coating of a heated tube and in particular to a coating process wherein fusible particles are transported through the tube in a flow of air.
  • the internal coating be free from voids or pin holes. It also should have a uniform thickness and a smooth surface.
  • the method used to coat the tube should be both reproducible and simple in operation.
  • Fluidized beds have been suggested as a supply source for the fusible particles from which location they are carried through the tube in a stream of air. This is generally a continous flowing stream with excess particles collected at the other end.
  • the apparatus provides a means for reversing flow through the tube from a second fluidized bed to promote uniformity of coating of the tubing.
  • the tube to be coated is heated, horizontally supported, and rotated in accordance with common practice.
  • the first end of the tube to be coated is connected to a charging container with a pipe including a quick-opening valve which is closed at this time.
  • a measured charge of the coating material is placed in the container.
  • the second end of the tube is connected with a pipe to a vacuum tank.
  • a vacuum pump places the tank and the tube under vacuum.
  • the valve is suddenly opened so that flow suddenly occurs from the container into the tube carrying the fusible particles with it.
  • the vacuum in the tank and the tube causes a high initial flow rate which decreases with time as the vacuum is dissipated by the inflowing air.
  • the vacuum pump may or may not be operated during this time.
  • An additional valve may be added between the tube and the vacuum tank so that vacuum may be drawn within the tank while the tube is being placed into position.
  • the valve is then opened to place the tube under vacuum as well as the tank; and when the vacuum has been established at the proper level, the quick-opening valve initiates the process as described above.
  • the apparatus for carrying out this method includes a measuring means for depositing only a predetermined quantity of fusible particles within the container. These particles are placed within the container in an unpacked condition either by using a fluidized bed or by pouring them into the chamber over a fall breaking apparatus which will permit the particles to remain in a fluffed condition for sufficient time to achieve operation of the apparatus.
  • the vacuum level in the tank is sensed, and means are provided for opening the quick-opening valve in response to a preselected vacuum level.
  • a plurality of vacuum tanks may be connected to the initial tank to provide a controllable variation in the volume which is evacuated. This provides ability to easily manipulate the time rate of flow variation when opening the quick-opening valve.
  • the tube to be coated 10 is first cleaned and preferably internally sand blasted to white metal.
  • a primer may or may not be applied to the clean surface.
  • This tube is then preheated to a temperature level above the melting point of the powder which will be deposited on the internal surface. The actual temperature level depends on the coating material to be used.
  • This tube is then placed on rolls 12 while still hot and rotated at a predetermined speed such as 100 rpm. This rotation aids circumferential distribution of the coating.
  • Air tight rotary connection 14 connects the first end of the tube to be coated by pipe 16 to a charging location within container 18.
  • the pipe 16 includes a quick-opening valve 20 whereby the container may be selectively placed in fluid communication with the tube interior.
  • a hopper 22 contains a supply of powdered material which is to be used for coating the pipe.
  • a predetermined weight of the fusible particles 24 are to be used to coat the interior of the tube. The desired amount of these particles for the tube to be coated are weighed in scale 26, and the selected charge is then placed within the container 18. They are located within the container at a location generally near the outlet through pipe 16 and are preferably maintained in a fluffed or unpacked condition.
  • a fluidized bed is used wherein a supply of fluidizing air passes in through pipe 28 and valve 30 through bed support 32 in accordance with well-known fluidizing principles.
  • the material could be placed in a container gently so that it retains a fluffed condition which may be maintained so long as the container is not unduly jarred or vibrated.
  • An imperforate vacuum tank 34 is connected to the second end of the tube 10 with an air tight rotary coupling 38.
  • the connecting pipe 40 between the inlet connection 42 on the imperforate tank 34 and the rotary coupling 38 may include valve 44 if certain operation as described below is required. Otherwise this valve is not required.
  • a vacuum pump 46 such as an air ejector is in fluid communication with the tank 34 through pipe 48 and operates to place the tank under vacuum. With valve 20 closed and valve 44 either omitted or open, the tank and the interior of pipe 10 are both placed under vacuum. Because of the low flow rate through the pipe existing while establishing a vacuum, the vacuum level in the tank and the pipe are essentially the same and may be measured by pressure sensor 50.
  • quick-opening valve 20 is opened at time 55. This may be done as soon as the vacuum reaches the desired level, and the flat portion illustrated in Figure 2 is not necessary
  • valve 20 With the opening of valve 20 there is a sudden flow of air into the tube 10 as shown in Figure 3 by curve 57.
  • the vacuum in the tank decays as illustrated by 59 in Figure 2. Accordingly, there is a sudden surge of air flow which then uniformly decreases.
  • the sudden change in the particle environment from atmospheric pressure to the low pressure causes an explosion-like action which creates a cloud of powder which is conveyed through the tube.
  • the rate of air flow peaks and decays in a manner related to the vacuum.
  • Curve 59 shows the continuing air flow when the vacuum pump continues running.
  • the air flow pattern is a function of the tank volume and the tube size as well as the vacuum level.
  • a roughened internal surface seems to occur when the tube is too hot or when the powder is insufficiently fluffed in container 18.
  • Insufficient coating at the downstream end tends to be caused by insufficient powder quantity or by too low a vacuum.
  • the pipe 16 should be of a smaller diameter than the tube to be coated. This increases the velocity thru pipe 16 decreasing or avoiding the possibility of powder remaining in this pipe. Material left behind would cause erratic quantity delivery to the successive pipes being coated.
  • the high velocity in pipe 16 as compared to the decreased velocity in the tube 10 results in good dispersal of the material with the tube.
  • any particles which are carried through the system are collected in centrifugal vacuum tank 34 or in bag filter 54. These particles may be intermittently removed through valves 56 and 58, respectively. While these particles may be recycled for use, it still is not desirable to have a substantial amount of particles passing through the pipe. To the extent that there is large wastage at the pipe discharge, this provides an increasingly sizable percentage of the injected material which is passing completely through the pipe and not being deposited on the surface. The larger this amount the more variation there is in the actual pipe coating with variations in system operation.
  • Auxiliary vacuum tanks 60 and 62 are isolatably connected to the vacuum tank 34 through valves 64 and 66. These tanks may be cut in or out as desired thereby varying the volumetric capacity of the vacuum system. Accordingly, the time flow characteristic of the system may be adjusted.
  • the system may be automatically operated with pressure sensor 50 sending a control signal through control line 68 to a set point 70 where the signal is compared to a desired pressure level signal or set point 72.
  • This may operate to maintain a vacuum level in the tank by varying the air flow through line 52 by modulating control valve 74 with controller 76.
  • this control will limit the vacuum and hold it at a preselected level.
  • control signal indicative of pressure level from pressure sensor 50 also passes through control line 78 to set point location 80 where it is compared with a set point 82 which represents the desired pressure level at which the quick-opening valve 20 is to open.
  • set point 82 which represents the desired pressure level at which the quick-opening valve 20 is to open.
  • valve 44 which may be closed while pipe 10 is being changed.
  • the vacuum pump may operate at this time to establish a vacuum in tank 34 while the pipe is being changed.
  • valve 44 is opened with pipe 10 being evacuated at which time it would be ready to operate in accordance with the above-described procedure.
  • the pipe was a range 2 drill pipe which is a pipe approximately 9.5 meters long.
  • the material used to coat the pipe was an epoxy melt mix of approximately the following composition:
  • the particular material used was an epoxy powder prepared by Whittaker Coatings and Chemicals Co. of Colton, California, using the trade name, "Interior Oil Pipe Coating--E. S. Powder".
  • the manufacturer code identification was 8502-B235.
  • the vacuum setting given in the table is the trip point at which the quick-opening valve is opened.
  • the vacuum tank had a volume of 0.125 cubic meters. Considering the connecting hoses as well as the pipe to be coated, the total volume varied from 0.221 cubic meters for 12.7 centimeter pipe down to 0.163 cubic meters for 8.9 centimeter pipe.
  • the flexible hose connecting the charging location to the pipe was approximately 3.8 centimeters inside diameter. It was estimated that the velocity in this line was maintained at approximately 20 meters per second with the venturi vacuum system being kept in operation.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Pens And Brushes (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
EP81102186A 1980-04-11 1981-03-24 Verfahren und Vorrichtung zur Beschichtung von Rohren Expired EP0037929B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13938080A 1980-04-11 1980-04-11
US139380 1998-08-25

Publications (2)

Publication Number Publication Date
EP0037929A1 true EP0037929A1 (de) 1981-10-21
EP0037929B1 EP0037929B1 (de) 1984-10-31

Family

ID=22486351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102186A Expired EP0037929B1 (de) 1980-04-11 1981-03-24 Verfahren und Vorrichtung zur Beschichtung von Rohren

Country Status (4)

Country Link
EP (1) EP0037929B1 (de)
CA (1) CA1156883A (de)
DE (1) DE3166899D1 (de)
NO (1) NO161164C (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207618A (en) * 1961-08-03 1965-09-21 Internat Protected Metals Inc Method and apparatus for applying protective coatings
GB1020253A (en) * 1962-10-10 1966-02-16 Johannes Josephus Heilker Method and apparatus for coating the inside of hollow bodies
US3532531A (en) * 1966-06-20 1970-10-06 American Mach & Foundry Coating method with cooled particles from a fluidized bed
US4089998A (en) * 1976-07-13 1978-05-16 Gibson Jack Edward Method of powder coating the interior of tubular goods
US4243699A (en) * 1977-12-20 1981-01-06 Gibson Jack Edward Method of powder coating the inside of pipes with a continuous film of plastic material

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207618A (en) * 1961-08-03 1965-09-21 Internat Protected Metals Inc Method and apparatus for applying protective coatings
GB1020253A (en) * 1962-10-10 1966-02-16 Johannes Josephus Heilker Method and apparatus for coating the inside of hollow bodies
CH455588A (de) * 1962-10-10 1968-07-15 Josephus Heilker Johannes Vorrichtung zum Auskleiden von Rohren
US3532531A (en) * 1966-06-20 1970-10-06 American Mach & Foundry Coating method with cooled particles from a fluidized bed
US4089998A (en) * 1976-07-13 1978-05-16 Gibson Jack Edward Method of powder coating the interior of tubular goods
US4122798A (en) * 1976-07-13 1978-10-31 Gibson Jack Edward Apparatus for coating the interior of tubular goods
US4243699A (en) * 1977-12-20 1981-01-06 Gibson Jack Edward Method of powder coating the inside of pipes with a continuous film of plastic material

Also Published As

Publication number Publication date
CA1156883A (en) 1983-11-15
EP0037929B1 (de) 1984-10-31
NO811074L (no) 1981-10-12
DE3166899D1 (en) 1984-12-06
NO161164C (no) 1989-07-12
NO161164B (no) 1989-04-03

Similar Documents

Publication Publication Date Title
US4382421A (en) Tube coating apparatus
US4122798A (en) Apparatus for coating the interior of tubular goods
EP0257683B1 (de) Pulverabgabevorrichtung
US3207618A (en) Method and apparatus for applying protective coatings
US4243699A (en) Method of powder coating the inside of pipes with a continuous film of plastic material
US5468066A (en) Apparatus and method for injecting dry particulate material in a fluid flow line
EP0085818B1 (de) Verfahren zum Emaillieren von Gegenständen durch elektrostatisches Aufsprühen
RU2005106239A (ru) Способ и устройство для подачи пылевидного материала
JPS6317650Y2 (de)
HUP9904153A2 (hu) Eszköz és eljárás szemcsés anyag bemérésére és ilyen eszközök sorozatából álló készülék
EP0037929B1 (de) Verfahren und Vorrichtung zur Beschichtung von Rohren
US3514905A (en) Hydraulic method and apparatus for dispensing granular material under pressure
US20130011228A1 (en) Method and Apparatus for Dry-Conveying Material for Dry Gunning Application
US4514093A (en) Method and apparatus for delivery of a powder
JPH10508534A (ja) 遠隔的シーリングおよびコーティングのためのエーロゾルの製造および送達の方法ならびに装置
US3923343A (en) Boast assisted conveying system
JP3632750B2 (ja) 塩化ビニル系樹脂粉体の空気移送方法
JPH02502982A (ja) 研磨材によるブラスト装置
JPH08309477A (ja) 鋳物砂の再生処理システム
JP2950352B2 (ja) 管内面の粉体塗装方法
CA1216616A (en) Apparatus for dispensing an abrasive into a gas stream
US4816297A (en) Method of powder coating the inside of pipes with a continuous film of plastic material
JP2002068367A (ja) 粉体充填時の排風制御方法及びその装置
JPH05192612A (ja) 粉体塗料の供給装置及び摩擦帯電装置
USRE32921E (en) Method of powder coating the inside of pipes with a continuous film of plastic material

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19811128

ITF It: translation for a ep patent filed

Owner name: ING. ZINI MARANESI & C. S.R.L.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE FR GB IT NL

REF Corresponds to:

Ref document number: 3166899

Country of ref document: DE

Date of ref document: 19841206

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

NLS Nl: assignments of ep-patents

Owner name: VETCO SERVICES, INC. TE HOUSTON, TEXAS, VER. ST. V

ITPR It: changes in ownership of a european patent

Owner name: CESSIONE;VETCO SERVICE INC.

ITTA It: last paid annual fee
REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20000302

Year of fee payment: 20

Ref country code: FR

Payment date: 20000302

Year of fee payment: 20

Ref country code: DE

Payment date: 20000302

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20000307

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20010323

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20010324

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Effective date: 20010323

NLV7 Nl: ceased due to reaching the maximum lifetime of a patent

Effective date: 20010324