WO2015030644A1 - Arrangement for surface treatment of pipes and pipe sections - Google Patents

Arrangement for surface treatment of pipes and pipe sections Download PDF

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Publication number
WO2015030644A1
WO2015030644A1 PCT/SE2014/000107 SE2014000107W WO2015030644A1 WO 2015030644 A1 WO2015030644 A1 WO 2015030644A1 SE 2014000107 W SE2014000107 W SE 2014000107W WO 2015030644 A1 WO2015030644 A1 WO 2015030644A1
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WO
WIPO (PCT)
Prior art keywords
surface treatment
nozzle
shaped part
agent
pipe
Prior art date
Application number
PCT/SE2014/000107
Other languages
French (fr)
Inventor
Ola Stark
Peter Jansson
Original Assignee
Scana Subsea Ab
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 Scana Subsea Ab filed Critical Scana Subsea Ab
Publication of WO2015030644A1 publication Critical patent/WO2015030644A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/76—Applying the liquid by spraying
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/182—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for screw-threaded joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/30—Arrangements for collecting, re-using or eliminating excess spraying material comprising enclosures close to, or in contact with, the object to be sprayed and surrounding or confining the discharged spray or jet but not the object to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/09—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles
    • B05C3/109—Passing liquids or other fluent materials into or through chambers containing stationary articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C7/00—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work
    • B05C7/04—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work the liquid or other fluent material flowing or being moved through the work; the work being filled with liquid or other fluent material and emptied
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings

Definitions

  • the present invention relates to surface treatment equipment for surface treatment of pipes and pipe sections, for example those intended for the offshore industry .
  • metal pipes or sections of a metal pipe for example a pipe thread
  • a conventional method of surface treatment involves part of the pipe with the pipe thread being lowered by an overhead crane into a tank containing surface treatment agent, after which the pipe is lifted out and flushed with a rinsing agent.
  • surface treatment agent and rinsing agent are delivered to the pipe that is to be surface-treated via an inner or an outer pipe.
  • a pipe of smaller diameter is placed inside the pipe that is to be surface-treated, after which surface treatment agent and rinsing agent are delivered to the inside of the pipe via the gap between the two pipes.
  • the pipe whose outside is to be surface-treated is placed inside a pipe of greater diameter.
  • the main object of the present invention has been to develop simple, safe and environmentally friendly surface treatment equipment for surface treatment of pipes and pipe sections.
  • a further object of the invention has been to develop flexible surface treatment equipment that can be easily adapted to surface treatment of different parts of a pipe.
  • the surface treatment equipment comprises a surface treatment nozzle designed to transfer surface treatment agent and rinsing agent to and from the pipe section that is to be surface-treated, and the surface treatment nozzle is connected to a first container that holds surface treatment agent and to a second container that holds rinsing agent.
  • the surface treatment equipment is characterized in that the surface treatment nozzle is designed to be fitted in a liquid-tight manner onto one of the ends of the pipe section, and in that, after it has been fitted, the surface treatment nozzle forms, together with the first container and the second container, a closed system in which surface treatment agent and rinsing agent are recirculated.
  • the surface treatment nozzle is connected to the first tank on the one hand via a first delivery line, a surface treatment pump and a first control valve for supplying surface treatment agent to the nozzle, on the other hand via a first return line, a second return line and a three-way valve for returning surface treatment agent from the surface treatment nozzle to the first tank
  • the surface treatment nozzle is also connected to the second tank on the one hand via a second delivery line, a rinsing agent pump and a second control valve for supplying rinsing agent to the surface treatment nozzle, on the other hand via the first return line, a third return line and the three- way valve for returning rinsing agent from the nozzle to the second tank
  • the surface treatment nozzle comprises an outer cylinder-shaped part comprising at least one sealing ring for liquid-tight sealing between the inside of the cylinder-shaped part and the outside of the pipe end, and also an inner piston-shaped part comprising at least one sealing ring for liquid-t
  • the surface treatment equipment constitutes a closed system, which effectively prevents discharge of surface treatment agent and rinsing agent to the environment; a closed system allows the surface treatment equipment to be pressurized, which means a quicker and safer surface treatment process; use of a surface treatment nozzle means that heavy lifting can be avoided; use of a surface treatment nozzle entails simpler surface treatment equipment that can be easily transported . With a few simple manoeuvres, the surface treatment equipment can be set up for internal surface treatment
  • Fig. 1 shows a schematic representation of surface treatment equipment comprising a surface treatment nozzle fitted on a pipe end
  • Fig. 2 shows a schematic representation of surface treatment equipment according to Figure 1, arranged for surface treatment of the outside of the pipe end
  • Fig. 3 shows a schematic representation of surface treatment equipment according to Figure 1, arranged for surface treatment of the inside of the pipe end.
  • the invention relates to surface treatment equipment for surface treatment of metal pipes. It preferably relates to surface treatment equipment for phosphating internal or external pipe threads.
  • a surface treatment solution comprising phosphoric acid is delivered to the metal surface that is to be surface-treated, whereupon a phosphate layer forms as a result of the phosphoric acid reacting chemically with the metal surface of the pipe.
  • Suitable surface treatment solutions for phosphating comprise an aqueous solution of phosphoric acid and various metal phosphates, among which 5.0 to 10.0% by weight of orthophosphoric acid, 10.0 to 25.0% by weight of manganese phosphate, 0.25 to 0.50% by weight of nickel nitrate, and 2.5 to 10.0% by weight of manganese dinitrate.
  • Phosphating is usually followed by some type of aftertreatment , e.g. oiling or lacquering.
  • Pipe sections with a high degree of strength and hardness also need to be heat-treated in order to reduce the risk of hydrogen embrittlement .
  • the phosphate layer is crystalline and porous and, as a result of its chemical binding to the underlying metal, is firmly anchored.
  • the phosphate layer is also electrically non-conductive and therefore passivates the metal surface, i.e. counteracts corrosion.
  • the phosphate layer provides lubrication, which increases the resistance to wear and prevents direct metallic contact between sliding surfaces.
  • the area that is to be phosphated is cleaned by the following measures: cleaning by abrasive blasting, cleaning by blowing with compressed air, washing with acetone, or similar more environmentally friendly alternatives, cleaning by blowing with compressed air and optional pre-heating.
  • the phosphated area is aftertreated by the following measures: flushing with water, cleaning by blowing with compressed air, cooling and oiling of the phosphated area.
  • FIG. 1 shows a schematic representation of surface treatment equipment 1 according to a preferred embodiment of the invention, for surface treatment of a pipe end 3.
  • the surface treatment equipment 1 comprises a surface treatment nozzle 2 designed to be fitted on a pipe end 3.
  • the surface treatment equipment 1 also comprises a first tank 4 that holds a surface treatment solution 5, and a second tank 6 that holds a rinsing agent 7.
  • the surface treatment nozzle 2 is connected to the first tank 4 on the one hand via a first delivery line 8, a surface treatment pump 9 and a first control valve 10 for supplying surface treatment agent 5 to the nozzle 2, on the other hand via a first return line 11, a second return line 13 and a three-way valve 12 for returning surface treatment agent 5 from the nozzle 2 to the first tank 4.
  • the surface treatment nozzle 2 is also connected to the second tank 6 on the one hand via a second delivery line 15, a rinsing agent pump 17 and a second control valve 16 for supplying rinsing agent 7 to the nozzle 2, on the other hand via the first return line 11, a third return line 14 and the three-way valve 12 for returning rinsing agent 7 from the nozzle 2 to the second tank 6.
  • the control valves and the pumps are of standard types and are therefore not described in any detail in the text below.
  • Figure 2 shows a surface treatment nozzle 2 according to Figure 1, designed for surface treatment of the conical outside 18 of the pipe end 3, which outside 18 is composed of an external pipe thread, for example.
  • the surface treatment nozzle 2 is designed for liquid- tight placement on the pipe end 3 by one of the following techniques: threaded fit, bayonet fit, snap fit or press fit.
  • the surface treatment nozzle 2 comprises an outer cylinder-shaped part 25 comprising at least one sealing ring 22 for liquid-tight sealing between the inside of the cylinder-shaped part 25 and the outside 27 of the pipe end 3, and also an inner piston-shaped part 26 comprising at least one sealing ring 23 for liquid-tight sealing between the outside of the piston-shaped part 26 and the inside of the pipe end 3.
  • the sealing rings are preferably of an expandable type, inflatable with air. Alternatively, the sealing rings can also be of a standard type.
  • the surface treatment agent 5 from the delivery line 8 is transferred to the conical outside 18 via a first tubular channel 21 arranged in the piston-shaped part 26 of the nozzle 2.
  • the pressure arising when surface treatment agent 5 is pumped into the space between the nozzle 2 and the pipe section 3 forces the surface treatment agent 5 onwards, via ⁇ a second tubular channel 19 arranged in the cylinder-shaped part 25 of the nozzle 2, out to the return line 11 and then back to the surface treatment container 4.
  • Figure 3 shows a surface treatment nozzle 2 according to Figure 1, designed for surface treatment of the conical inside 24 of the pipe end 3, which inside 24 is composed of an internal pipe thread, for example.
  • the nozzle 2 comprises, for surface treatment of the conical inside 24 of the pipe end 3, an outer cylinder-shaped part 25 comprising at least one sealing ring 22 for sealing between the inside of the cylinder-shaped part 25 and the outside 27 of the pipe end 3, and also an inner piston-shaped part 28 comprising at least one sealing ring 23 for liquid-tight sealing between the outside of the piston-shaped part 26 and the inside of the pipe end 3.
  • the inner piston-shaped part 28 is extended here, which permits surface treatment of all or part of the inside of the pipe end 3 depending on the length of the piston-shaped part 28.
  • the piston-shaped part 28 is arranged movably in the axial direction on the surface treatment nozzle, for example via racks or via slide bearings (not shown) .
  • both the outer cylinder-shaped part 25 and also the inner piston-shaped part 28 are arranged movably in the axial direction on the surface treatment nozzle 2 via racks or slide bearings in order to adjust the nozzle 2 depending on whether the outside 18 or inside 24 of the pipe end 3 is to be surface-treated.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The present invention relates to surface treatment equipment (1) for surface treatment of a pipe or a pipe section (3), wherein the surface treatment equipment (1) comprises a surface treatment nozzle (2) designed to transfer surface treatment agent (5) and rinsing agent (7) to and from the pipe section (3) that is to be surface-treated, and the surface treatment nozzle (2) is connected to a first container (4) that holds surface treatment agent (5) and to a second container (6) that holds rinsing agent (7). The invention is characterized in that the surface treatment nozzle (2) is designed to be fitted onto the end of the pipe section (3), and in that, after it has been fitted, the surface treatment nozzle (2) forms, together with the first container (4) and the second container (6), a closed system in which surface treatment agent (5) and rinsing agent (7) are recirculated between the pipe section (3) and the first container (4) and between the pipe section (3) and the second container (6), respectively.

Description

ARRANGEMENT FOR SURFACE TREATMENT OF PIPES AND PIPE SECTIONS
TECHNICAL FIELD
The present invention relates to surface treatment equipment for surface treatment of pipes and pipe sections, for example those intended for the offshore industry . BACKGROUND AND PRIOR ART
It has long been known that metal pipes or sections of a metal pipe, for example a pipe thread, can be surface-treated chemically, for example by phosphating, in order thereby to improve the friction, wear and corrosion properties of the pipe thread. A conventional method of surface treatment involves part of the pipe with the pipe thread being lowered by an overhead crane into a tank containing surface treatment agent, after which the pipe is lifted out and flushed with a rinsing agent.
In an alternative method, known from the patent document US 4 828 796, surface treatment agent and rinsing agent are delivered to the pipe that is to be surface-treated via an inner or an outer pipe. For surface treatment of the inside of the pipe, a pipe of smaller diameter is placed inside the pipe that is to be surface-treated, after which surface treatment agent and rinsing agent are delivered to the inside of the pipe via the gap between the two pipes. For external surface treatment of the pipe, the pipe whose outside is to be surface-treated is placed inside a pipe of greater diameter. With said technique, the amount of surface treatment agent and rinsing agent can be limited to the space in the gap between the two pipes.
Problems associated with said methods of surface treatment can be summarized as being that the methods are complicated, require masking of parts that are not to be surface-treated, involve heavy lifting with overhead cranes and involve discharge of environmentally hazardous substances into the environment .
OBJECT OF THE INVENTION AND FEATURES THEREOF
The main object of the present invention has been to develop simple, safe and environmentally friendly surface treatment equipment for surface treatment of pipes and pipe sections.
A further object of the invention has been to develop flexible surface treatment equipment that can be easily adapted to surface treatment of different parts of a pipe.
These objects, and other aims not listed here, are achieved satisfactorily by what is set forth in the independent patent claim attached.
Embodiments of the invention are set forth in the dependent patent claims.
Thus, according to the present invention, it has been possible to develop simple, quick, safe and environmentally friendly surface treatment equipment for surface treatment of a pipe or a pipe section, wherein the surface treatment equipment comprises a surface treatment nozzle designed to transfer surface treatment agent and rinsing agent to and from the pipe section that is to be surface-treated, and the surface treatment nozzle is connected to a first container that holds surface treatment agent and to a second container that holds rinsing agent.
The surface treatment equipment is characterized in that the surface treatment nozzle is designed to be fitted in a liquid-tight manner onto one of the ends of the pipe section, and in that, after it has been fitted, the surface treatment nozzle forms, together with the first container and the second container, a closed system in which surface treatment agent and rinsing agent are recirculated.
According to further aspects of surface treatment equipment, provision is made that: the surface treatment nozzle is connected to the first tank on the one hand via a first delivery line, a surface treatment pump and a first control valve for supplying surface treatment agent to the nozzle, on the other hand via a first return line, a second return line and a three-way valve for returning surface treatment agent from the surface treatment nozzle to the first tank, and the surface treatment nozzle is also connected to the second tank on the one hand via a second delivery line, a rinsing agent pump and a second control valve for supplying rinsing agent to the surface treatment nozzle, on the other hand via the first return line, a third return line and the three- way valve for returning rinsing agent from the nozzle to the second tank, the surface treatment nozzle comprises an outer cylinder-shaped part comprising at least one sealing ring for liquid-tight sealing between the inside of the cylinder-shaped part and the outside of the pipe end, and also an inner piston-shaped part comprising at least one sealing ring for liquid-tight sealing between the outside of the piston-shaped part and the inside of the pipe end, an outer cylinder-shaped part comprising at least one sealing ring for sealing between the inside of the cylinder-shaped part and the outside of the pipe end, and also an inner extended piston-shaped part comprising at least one sealing ring for liquid-tight sealing between the outside of the piston-shaped part and the inside of the pipe end, the inner piston-shaped part is arranged movably in the axial direction on the nozzle in order to permit variable adjustment of the nozzle in respect of how large a part of the inside of the pipe end is to be surface-treated, the outer cylinder-shaped part and the inner piston- shaped part are arranged movably in the axial direction on the nozzle in order to permit variable adjustment of the nozzle in respect of whether the inside or outside of the pipe end is to be surface-treated, and the outer cylinder-shaped part and the inner piston- shaped part are arranged movably on the nozzle via racks .
ADVANTAGES AND EFFECTS OF THE INVENTION
The invention affords a number of advantages and effects, the most important of which are the following: the surface treatment equipment constitutes a closed system, which effectively prevents discharge of surface treatment agent and rinsing agent to the environment; a closed system allows the surface treatment equipment to be pressurized, which means a quicker and safer surface treatment process; use of a surface treatment nozzle means that heavy lifting can be avoided; use of a surface treatment nozzle entails simpler surface treatment equipment that can be easily transported . With a few simple manoeuvres, the surface treatment equipment can be set up for internal surface treatment
(box) or external surface treatment (pin) of a pipe by exchanging the surface treatment nozzle.
The invention has been defined in the attached patent claims and will now be described in more detail in connection with the attached figures.
Further advantages and effects will become clear from studying and considering the following detailed description of the invention and by referring at the same time to the attached figures, in which
Fig. 1 shows a schematic representation of surface treatment equipment comprising a surface treatment nozzle fitted on a pipe end, Fig. 2 shows a schematic representation of surface treatment equipment according to Figure 1, arranged for surface treatment of the outside of the pipe end, and Fig. 3 shows a schematic representation of surface treatment equipment according to Figure 1, arranged for surface treatment of the inside of the pipe end. DETAILED DESCRIPTION OF EMBODIMENTS
The invention relates to surface treatment equipment for surface treatment of metal pipes. It preferably relates to surface treatment equipment for phosphating internal or external pipe threads. In phosphating, a surface treatment solution comprising phosphoric acid is delivered to the metal surface that is to be surface-treated, whereupon a phosphate layer forms as a result of the phosphoric acid reacting chemically with the metal surface of the pipe. Suitable surface treatment solutions for phosphating comprise an aqueous solution of phosphoric acid and various metal phosphates, among which 5.0 to 10.0% by weight of orthophosphoric acid, 10.0 to 25.0% by weight of manganese phosphate, 0.25 to 0.50% by weight of nickel nitrate, and 2.5 to 10.0% by weight of manganese dinitrate. Phosphating is usually followed by some type of aftertreatment , e.g. oiling or lacquering. Pipe sections with a high degree of strength and hardness also need to be heat-treated in order to reduce the risk of hydrogen embrittlement . The phosphate layer is crystalline and porous and, as a result of its chemical binding to the underlying metal, is firmly anchored. The phosphate layer is also electrically non-conductive and therefore passivates the metal surface, i.e. counteracts corrosion.
Moreover, at high surface pressures, the phosphate layer provides lubrication, which increases the resistance to wear and prevents direct metallic contact between sliding surfaces. Before the phosphating is begun, the area that is to be phosphated is cleaned by the following measures: cleaning by abrasive blasting, cleaning by blowing with compressed air, washing with acetone, or similar more environmentally friendly alternatives, cleaning by blowing with compressed air and optional pre-heating. After the phosphating has been carried out, the phosphated area is aftertreated by the following measures: flushing with water, cleaning by blowing with compressed air, cooling and oiling of the phosphated area.
Figure 1 shows a schematic representation of surface treatment equipment 1 according to a preferred embodiment of the invention, for surface treatment of a pipe end 3. The surface treatment equipment 1 comprises a surface treatment nozzle 2 designed to be fitted on a pipe end 3. The surface treatment equipment 1 also comprises a first tank 4 that holds a surface treatment solution 5, and a second tank 6 that holds a rinsing agent 7. The surface treatment nozzle 2 is connected to the first tank 4 on the one hand via a first delivery line 8, a surface treatment pump 9 and a first control valve 10 for supplying surface treatment agent 5 to the nozzle 2, on the other hand via a first return line 11, a second return line 13 and a three-way valve 12 for returning surface treatment agent 5 from the nozzle 2 to the first tank 4. The surface treatment nozzle 2 is also connected to the second tank 6 on the one hand via a second delivery line 15, a rinsing agent pump 17 and a second control valve 16 for supplying rinsing agent 7 to the nozzle 2, on the other hand via the first return line 11, a third return line 14 and the three-way valve 12 for returning rinsing agent 7 from the nozzle 2 to the second tank 6. The control valves and the pumps are of standard types and are therefore not described in any detail in the text below.
Figure 2 shows a surface treatment nozzle 2 according to Figure 1, designed for surface treatment of the conical outside 18 of the pipe end 3, which outside 18 is composed of an external pipe thread, for example. The surface treatment nozzle 2 is designed for liquid- tight placement on the pipe end 3 by one of the following techniques: threaded fit, bayonet fit, snap fit or press fit. The surface treatment nozzle 2 comprises an outer cylinder-shaped part 25 comprising at least one sealing ring 22 for liquid-tight sealing between the inside of the cylinder-shaped part 25 and the outside 27 of the pipe end 3, and also an inner piston-shaped part 26 comprising at least one sealing ring 23 for liquid-tight sealing between the outside of the piston-shaped part 26 and the inside of the pipe end 3. The sealing rings are preferably of an expandable type, inflatable with air. Alternatively, the sealing rings can also be of a standard type.
The surface treatment agent 5 from the delivery line 8 is transferred to the conical outside 18 via a first tubular channel 21 arranged in the piston-shaped part 26 of the nozzle 2. The pressure arising when surface treatment agent 5 is pumped into the space between the nozzle 2 and the pipe section 3 forces the surface treatment agent 5 onwards, via^a second tubular channel 19 arranged in the cylinder-shaped part 25 of the nozzle 2, out to the return line 11 and then back to the surface treatment container 4. Figure 3 shows a surface treatment nozzle 2 according to Figure 1, designed for surface treatment of the conical inside 24 of the pipe end 3, which inside 24 is composed of an internal pipe thread, for example. In the same way as in the surface treatment of the outside 18 of the pipe end 3, the nozzle 2 according to Figure 1 comprises, for surface treatment of the conical inside 24 of the pipe end 3, an outer cylinder-shaped part 25 comprising at least one sealing ring 22 for sealing between the inside of the cylinder-shaped part 25 and the outside 27 of the pipe end 3, and also an inner piston-shaped part 28 comprising at least one sealing ring 23 for liquid-tight sealing between the outside of the piston-shaped part 26 and the inside of the pipe end 3.
The inner piston-shaped part 28 is extended here, which permits surface treatment of all or part of the inside of the pipe end 3 depending on the length of the piston-shaped part 28.
In a particular embodiment of the surface treatment nozzle 2 according to Figure 3, the piston-shaped part 28 is arranged movably in the axial direction on the surface treatment nozzle, for example via racks or via slide bearings (not shown) .
In a further particular embodiment of the surface treatment nozzle 2 according to Figure 3, both the outer cylinder-shaped part 25 and also the inner piston-shaped part 28 are arranged movably in the axial direction on the surface treatment nozzle 2 via racks or slide bearings in order to adjust the nozzle 2 depending on whether the outside 18 or inside 24 of the pipe end 3 is to be surface-treated.
The invention is not limited to the embodiments shown and instead can be varied in different ways within the scope of the patent claims.

Claims

PATENT CLAIMS
1. Surface treatment equipment (1) for surface treatment of a pipe section (3), wherein the surface treatment equipment (1) comprises a surface treatment nozzle (2) designed to transfer surface treatment agent (5) and rinsing agent (7) to and from the pipe section (3) that is to be surface-treated, and the surface treatment nozzle (2) is connected to a first container (4) that holds surface treatment agent (5) and to a second container (6) that holds rinsing agent (7), characterized in that the surface treatment nozzle (2) is designed to be fitted onto the end of the pipe section (3), and in that, after it has been fitted, the surface treatment nozzle (2) forms, together with the first container (4) and the second container (6), a closed system in which surface treatment agent (5) and rinsing agent (7) are recirculated between the pipe section (3) and the first container (4) and between the pipe section (3) and the second container (6), respectively .
2. Surface treatment equipment (1) according to Claim 1, characterized in that the surface treatment nozzle (2) is connected to the first tank (4) on the one hand via a first delivery line (8), a surface treatment pump (9) and a first control valve (10) for supplying surface treatment agent (5) to the nozzle (2), on the other hand via a first return line (11), a second return line (13) and a three-way valve (12) for returning surface treatment agent (5) from the surface treatment nozzle (2) to the first tank (4), and in that the surface treatment nozzle (2) is also connected to the second tank (6) on the one hand via a second delivery line (15), a rinsing agent pump (17) and a second control valve (16) for supplying rinsing agent (7) to the surface treatment nozzle (2), on the other hand via the first return line (11), a third return line (14) and the three-way valve (12) for returning rinsing agent (7) from the nozzle (2) to the second tank (6) .
Surface treatment equipment (1) according to Claim 1, characterized in that the surface treatment nozzle (2) comprises an outer cylinder-shaped part (25) comprising at least one sealing ring (22) for liquid-tight sealing between the inside of the cylinder-shaped part (25) and the outside (27) of the pipe end (3), and also an inner piston-shaped part (26) comprising at least one sealing ring (23) for liquid-tight sealing between the outside of the piston-shaped part (26) and the inside of the pipe end ( 3 ) .
Surface treatment equipment (1) according to Claim 1, characterized by an outer cylinder-shaped part (25) comprising at least one sealing ring (22) for sealing between the inside of the cylinder-shaped part (25) and the outside (27) of the pipe end (3), and also an inner extended piston-shaped part (28) comprising at least one sealing ring (23) for liquid-tight sealing between the outside of the piston-shaped part (28) and the inside of the pipe end ( 3 ) .
Surface treatment equipment (1) according to Claim 4, characterized in that the inner piston-shaped part (28) is arranged movably in the axial direction on the nozzle (2) in order to permit variable adjustment of the nozzle (2) in respect of how large a part of the inside of the pipe end (3) is to be surface-treated. Surface treatment equipment (1) according to Claim 4, characterized in that the outer cylinder-shaped part (25) and the inner piston-shaped part (28) are arranged movably in the axial direction on the nozzle (2) in order to permit variable adjustment of the nozzle (2) in respect of whether the inside or outside of the pipe end (3) is to be surface- treated .
Surface treatment equipment (1) according to Claim 6, characterized in that the outer cylinder-shaped part (25) and the inner piston-shaped part (28) are arranged movably on the nozzle (2) via racks.
PCT/SE2014/000107 2013-08-27 2014-08-22 Arrangement for surface treatment of pipes and pipe sections WO2015030644A1 (en)

Applications Claiming Priority (2)

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SE1330101A SE537355C2 (en) 2013-08-27 2013-08-27 Device for surface treatment of pipes and fittings
SE1330101-5 2013-08-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108486556A (en) * 2018-04-11 2018-09-04 海亮（安徽）铜业有限公司 Passivator relieving mechanism for copper tube wrapping machine

Citations (4)

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Publication number Priority date Publication date Assignee Title
FR2580370A1 (en) * 1985-04-12 1986-10-17 Fabbri Paul PROCESS AND INSTALLATION FOR THE TREATMENT AND / OR COATING OF INTERNAL PIPING SURFACES
US4828796A (en) * 1984-10-17 1989-05-09 Inzhenerny, Tsentr, Po, Selskokhozyaistvenno Vodosnabheniju, I, Truboprovodam Method of protecting the internal surface of a pipeline against corrosion
JP2003053220A (en) * 2001-08-23 2003-02-25 Kubota Corp Coating apparatus for inner face of faucet of metallic conduit
WO2012029967A1 (en) * 2010-08-31 2012-03-08 Sumitomo Metal Industries, Ltd. Coating apparatus for applying a uv curable resin to a threaded end of a steel pipe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4828796A (en) * 1984-10-17 1989-05-09 Inzhenerny, Tsentr, Po, Selskokhozyaistvenno Vodosnabheniju, I, Truboprovodam Method of protecting the internal surface of a pipeline against corrosion
FR2580370A1 (en) * 1985-04-12 1986-10-17 Fabbri Paul PROCESS AND INSTALLATION FOR THE TREATMENT AND / OR COATING OF INTERNAL PIPING SURFACES
JP2003053220A (en) * 2001-08-23 2003-02-25 Kubota Corp Coating apparatus for inner face of faucet of metallic conduit
WO2012029967A1 (en) * 2010-08-31 2012-03-08 Sumitomo Metal Industries, Ltd. Coating apparatus for applying a uv curable resin to a threaded end of a steel pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108486556A (en) * 2018-04-11 2018-09-04 海亮（安徽）铜业有限公司 Passivator relieving mechanism for copper tube wrapping machine

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SE1330101A1 (en) 2015-02-28

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