GB2042374A - Applying interior and exterior coverings to tubes or pipes - Google Patents
Applying interior and exterior coverings to tubes or pipes Download PDFInfo
- Publication number
- GB2042374A GB2042374A GB7930143A GB7930143A GB2042374A GB 2042374 A GB2042374 A GB 2042374A GB 7930143 A GB7930143 A GB 7930143A GB 7930143 A GB7930143 A GB 7930143A GB 2042374 A GB2042374 A GB 2042374A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tubes
- pipes
- covering
- station
- interior
- 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
Links
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000006698 induction Effects 0.000 claims abstract description 10
- 238000007689 inspection Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 19
- 230000001680 brushing effect Effects 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 239000010426 asphalt Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 235000021388 linseed oil Nutrition 0.000 description 1
- 239000000944 linseed oil Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0645—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies the hollow bodies being rotated during treatment operation
- B05B13/0654—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies the hollow bodies being rotated during treatment operation and a treating nozzles being translated through the hollow bodies in a direction essentially parallel to the rotational axis
-
- 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
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/001—Flocking
- B05C19/004—Flocking from an outlet device in contact, or almost in contact with the work
-
- 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
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/005—Apparatus specially designed for applying particulate materials to the inside of hollow work
- B05C19/007—Apparatus specially designed for applying particulate materials to the inside of hollow work for applying the particulate materials to the inside of hollow tubes
-
- 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
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
- B05C9/045—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work in which the opposite sides of the work are the internal and external surfaces of hollow articles
-
- 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
- B05D7/14—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 metal, e.g. car bodies
- B05D7/146—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 metal, e.g. car bodies to metallic pipes or tubes
-
- 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
- B05D2254/00—Tubes
- B05D2254/04—Applying the material on the interior of the tube
- B05D2254/06—Applying the material on the interior and exterior of the tube
-
- 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
- B05D3/0245—Pretreatment, e.g. heating the substrate with induction heating
-
- 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
- B05D3/12—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 mechanical means
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Automatic Assembly (AREA)
- Cleaning In General (AREA)
Abstract
The apparatus is constituted by pre-heating furnaces 3, an exterior shotting station 5 and an interior shotting station 7, and induction furnace 9, and exterior covering station 10, 11, a cooling apparatus 14, a separation apparatus 16, a cleaning station 19, an interior covering station 20, an inspection and repair station 22, and a delivery table 23. In station 10, 11 an exterior covering is applied to longitudinally aligned pipes so that the covering extends between adjacent pipes. Following cooling at 14, the pipes are separated at 16. <IMAGE>
Description
SPECIFICATION
A method of and means for applying interior and exterior coverings to tubes or pipes
The present invention is concerned with the treatment of metallic tubes or pipes for the purpose of their insulation and/or protection against corrosion, and has for object a method of and means for applying interior and exterior coverings to tubes or pipes.
At present the covering of metallic tubes or pipes by means of synthetic material is generally effected by external shotting, then by coating the external surface followed by a water cooling, then by interior shotting and by application of an interior covering, the latter operation being preceded by an operation of heating of the tube.
However in the known processes for the application of plastics coverings, it was not possible successively to carry out the operations of interior and exterior shotting and covering, since the interior of the tube was not protected against humidity, especially in the cooling of the exterior covering, so that water penetrating into the tube caused oxidation of the latter.
Therefore continuous and thus automatic work of shotting and coating with a large output is not possible in practice up to the present. Moreover the various operations caused a significant loss of energy.
The present invention has the aim of remedying these drawbacks.
It has in fact for object a process for the interior and exterior covering of tubes or pipes, consisting essentially in pre-heating the tubes or pipes, displacing them through an exterior shotting assembly, shotting them internally, then aligning them while forming a space between two successive tubes, heating them by induction, providing them with an exterior covering in one or more layers, cooling them, separating the tubes or pipes, brushing the extremities of the tubes or pipes over about 10 cm., providing them with one or more interior covering layers, effecting an inspection for absence of porosity and of the thickness of the coverings, also if necessary repair of observed defects, and finally in stocking the tubes or pipes obtained, before handling, all these operations being carried out automatically and continuously.
The invention also has for object an apparatus for carrying out the above-described process, constituted essentially by pre-heating furnaces, by an exterior shotting station, by an interior shotting station, by an induction furnace, by an exterior covering station, by an apparatus for cooling the tubes or pipes, by an apparatus for separating the tubes or pipes, by a station for cleaning the extremities, by an interior covering station, by an inspection and tube or pipe repair station, and by a table for delivery of the covered tubes or pipes, the various stations and apparatuses
being interconnected by continuous transfer conveyors.
According to one variant of embodiment of the method according to the invention, after the separation of the tubes or pipes and before their interior covering, the exterior covering is removed by brushing over about 1 5 cm. at the extremities of the tubes or pipes, the extremities of the covering are provided with a chamfer of about 30 by brushing and the extremities of the tubes or pipes are cleaned by brushing of the chamfers and stubs.
For carrying out the method as described above the cleaning station for the extremities of the tubes or pipes is constituted, for each tube or pipe extremity, by a radial brush disposed parallel to the axis of the tube or pipe and cleaning the latter over about 1 5 cm., a first axial brush disposed at an inclination of 30 in relation to the axis of the tube or pipe and permitting the formation of a chamfer on the extremity of the covering, and by a second axial brush disposed at the extremity of the tube or pipe with an inclination in relation to the axis which corresponds to the angle of chamfer of the tube or pipe.
The invention will be explained hereinafter with reference to a preferred form of embodiment, given by way of non-limitative example, which is explained with reference to the accompanying diagrammatic drawings wherein:
Figure 1 is a plan view of an apparatus according to the invention,
Figure 2 is a plan view showing the operation of cleaning one extremity of a tube or pipe, and
Figure 3 is a partial sectional view, on a larger scale, of a tube or pipe extremity.
According to the invention, and as shown more particularly by way of example in Fig. 1 of the accompanying drawings, the process for applying interior and exterior coverings to tubes or pipes consists in bringing tubes 1, previously disposed on a feed table 2, into pre-heating furnaces 3 by means of conveyor 4. The tubes 1 are brought into the conveyor 4 by means of arms controlled from a control panel (not shown). The conveyor 4 displaces the tubes 1 through the furnaces 3, which are constituted by a metallic plating, a refractory lining and torch-type burners supplied with gas, then through a shotting station 5, imparting a helical movement to them.The shotting station 5 is provided with an automatic apparatus for projection of shot by turbine, a shot recuperation apparatus and a system for cleaning and dust extraction permitting effective treatment of the air contained in the shotting tunnel.
At the exit from the station 5 the tubes are taken up again by a conveyor 6 which brings them towards an interior shotting station 7 composed of a shotting apparatus and a unit for treatment and recycling of the shot in the form of two retractable cases which can be positioned at the extremities of the tubes, whatever is their length. The shot is projected by a mobile shotting lance, while the tubes or pipes are set in rotation by a centrifuging assembly, and is recovered by the treatment and recycling unit. In the latter the shot is freed of dust and filtered before its return into the shotting apparatus. In this station 7 there is also provided a system of treatment for the air contained in the tube and in the treatment unit.
After the interior shotting the tubes are transferred to a pre-extrusion conveyor 8 which is supplied by means of arms controlled from a, central station. In this conveyor 8 a helical movement is applied to the tubes or pipes and they are placed one behind the other with the provision of a space between the extremities. This space is equal to approximately a quarter of the internal diameter of the tubes, namely for example for a tube of internal diameter of 800 mm., a space of 20 cm. The conveyor 8 displaces the tubes through a induction furnace 9 comprising a voltage transformer, a static frequency converter, a cabinet of capacitors and a set of inductors permitting of covering the whole range of tubes or pipes at the desired temperature, as a function of the covering to be applied.This temperature can be monitored in known manner by means of an optical pyrometer.
At the exit from the induction furnace 9 the tubes are continuously provided with a primary layer of exterior covering, for example of polyethylene, applied by transverse extrusion of a film by means of a primary extruder 10, and helical winding of this film over the tubes displaced by the conveyor 8. This first film is wound continuously over the succession of tubes, without interruption at the extremities, so that a flexible joint is formed. Following the primary extruder 10 a second extruder 11 is provided which applies a second covering layer to the tubes. This extruder 11 delivers, likewise transversely of the tubes, a film of polyethylene which is wound helically over the first covering layer, again without interruption at the joints between the tubes.This second film is dimensioned in such manner as to permit successive coverings in order to obtain the final thickness of the covering, while a presser roller acts upon the film to effect a perfect bond between the primary layer and the coatings of the second layer.
The extruders 10 and 11 are automatically fed from granule stock silos 1 2 and 1 3 in known manner.
After the positioning of the exterior covering the tubes are immediately cooled by water sprinkling in a device 14 for the purpose of their handling. The water used for this purpose is treated and supplied by a closedcircuit group 1 5 provided with an automatic regulation system.
This cooling operation has the purpose of bringing the tubes or pipes to an ideal internal temperature for the interior covering, of the order of 40 to 50 C. Thus the hitherto-necessary operations of heating before interior covering can be eliminated, so that a significant economy of energy is obtained.
Following upon the apparatus 14 the tubes are separated in a separation device 1 6 in which the polyethylene covering connecting the tubes in line with the joints is cut with a lever and blade system, then these tubes are discharged individually by a conveyor 1 7 and an extrusion delivery table 1 8 to a station 1 9 for cleaning the extremities. In the latter each tube is set in rotation on a centrifuging assembly and a brushing is effected on each extremity over about 10 cm., this brushing having the purpose of rendering the extremities free from all soiling.
Following upon the cleaning of their extremities, the tubes are brought to an interior covering station 20 by a conveyor 21 and are set in rotation by a centrifuging assembly. In this station 20 a movable carriage equipped with a lance with paint atomiser guns at the extremity permits of penetrating into the rotation tube and applying a layer of bituminous, epoxy or paint interior covering. This station 20 can advantageously be duplicated so that two successive interior covering operations can be carried out. After the placing of the last layer of interior covering each tube passes through a station 22 for inspection for absence of porosity and for monitoring the covering thicknesses. This station 22 comprises essentially an apparatus for detecting electrical insulation defects, operating in a fixed position.Any defects observed in this station 22 are repaired manually at the end of the manufacturing line, and the tubes which have passed the inspection are stocked on a delivery table 23 awaiting handling.
The sprinkling of water in the apparatus 14 is carried out at very low temperature, and the continuous exterior covering prevents any penetration of moisture into the tubes, so that all risk of oxidation is avoided.
With the process and the apparatus according to the invention, after the shotting operations it is equally possible to carry out the exterior and interior coverings simultaneously with epoxy powder, by means of a projection cabin 24 mounted following the induction furnace 9 and constituted by a stainless steel casing, and by an electrostatic powder application system which applies the product to tubes previously heated to about 240"C. Under the effect of the heat the powder melts forming a homogeneous covering. Following this operation the tubes follow the same
stages as those described above, with the
exception of the interior covering and the cutting apart of the tubes.
An analogous procedure is likewise used for exterior and interior coverings of tubes with
polyurethane. The tubes in this case are sim
ply heated to about 55"C., then internally and externally covered with a two-component product by means of a pressure gun projection assembly 25, equipped with an automatic system for quantity regulation and mixing.
Finally by means of the method and apparatus according to the invention it is also possible at the exit from the interior shotting station 7 to bring the tubes into a station 26 for interior covering by atomisation of bitumen or another covering known per se, then to provide the tubes in a primary exterior covering station 27 with a first layer of bitumen, and in a second bitumen application station 28 with a final exterior covering, the stations 27 and 28 being supplied from a tank 29 of liquid bitumen.
The first layer of bitumen is applied by atomisation while the second is applied to the first by an impregnated tape wound helically over the tube. Following the application of the second layer of bitumen the tubes may further be provided externally with a solution of linseed oil, quicklime and sea salt to obtain solar protection. After the last operation the tubes are brought to an inspection station 30 before storage. It is equally possible to provide the tubes, before or after their passage through the inspection station, with other coverings at a station 31 provided for this purpose.
The pre-heating of the tubes before shotting is effected to a temperature of about 50 to 60"C., in order to eliminate any trace of moisture and of greasy substance on the surface of the tubes.
According to a variant of the method according to the invention, and as shown more particularly by Fig. 2 and 3 of the accompanying drawings, after the separation-of the tubes or pipes and before their exterior covering, each tube or pipe is subjected to an operation of cleaning of the extremities.
This operation of cleaning of the extremities 32 of the tube or pipe 1' consists in removal of the exterior covering over a length of about 1 5 cm. by means of a radial brush 33 disposed parallel with the axis of the tube or pipe 1', in providing the extremities 34 of the covering with a chamfer of about 30 by brushing the said extremities by means of a first axial brush 35, which is disposed at 30 in relation to the axis of the tube or pipe, and cleaning the extremities of the tube or pipe in the region of their chamfer 36 and their stub by means of a second brush 37, the inclination of which in relation to the axis is a function of the angle of the chamfer 36 of the said tube or pipe 1'.
This operation of cleaning of the extremities
is carried out continuously and in a fully
automatic manner by means of known devices for manoeuvring the brushes.
By virtue of the invention it is possible to
produce internally and externally covered tubes or pipes continuously, automatically, with a good output and an appreciable energy gain.
The invention is not of course limited to the form of embodiment as described and as represented in the accompanying drawings.
Modifications remain possible, especially by substitution of equivalent technical means, without thereby departing from the scope of protection of the invention.
Claims (9)
1. A method of applying interior and exterior coverings to tubes or pipes, characterised in that it consists essentially in pre-heating the tubes or pipes, in moving them through an exterior shotting assembly, in shotting them internally, then aligning them forming a space between two successive tubes, in heating them by induction, in providing them with an exterior covering in one or more layers, continuously, without interruption at the level of the extremities, so as to form a flexible joint, in cooling them to bring them to an ideal internal temperature for the interior coating of the order of 40 to 50"C., in separating the tubes or pipes, brushing their extremities over about 10 cm., providing them with one or more interior covering layers, effecting an inspection for absence of porosity and of the thicknesses of the coverings and any necessary repair of observed defects, and finally in storing the tubes or pipes obtained before handling, all these operations being carried out automatically and continuously so that a substantial energy gain is obtained.
2. A method according to Claim 1, characterised in that the space between the extremities of the tubes or pipes is preferably equal to a quarter of the internal diameter of the tubes or pipes.
3. An apparatus for carrying out the method according to Claim 1, characterised in that it is constituted essentially by pre-heating furnaces, by an exterior shotting station, by an interior shotting station, by an induction furnace, by an exterior covering station, by an apparatus for cooling the the tubes or pipes, by an apparatus for separating the tubes or pipes, by a station for cleaning the extremities, by an interior covering station, by a station for inspection and repair of the tubes or pipes, and by a delivery table for the covered tubes or pipes, the various stations and apparatuses being interconnected by continuous transfer conveyors.
4. An apparatus according to Claim 3, characterised in that between the induction furnace and the cooling apparatus for the tubes or pipes, and in place of the exterior covering station, there is provided an epoxy powder projection cabin constituted by a casing of stainless steel and by an electrostatic powder application system which applies the product internally and externally to the tubes previously heated to about 240"C., the powder melting in this application and forming a homogeneous covering, and at the exit from this projection cabin the tubes or pipes follow the same operations as those described in the method according to Claim 1, with the exception of the interior covering and the cutting apart of the tubes.
5. An apparatus according to Claim 3, characterised in that between the induction furnace and the cooling apparatus, and in place of the exterior covering station, there is provided a polyurethane projection assembly with pressure guns, equipped with an automatic quantity-regulating and mixing system, permitting simultaneous interior and exterior covering of the tubes or pipes previously heated to about 55"C., the tubes or pipes after this operation followint the same stages as those described in Claim 1, except the interior covering and the cutting apart of the tubes.
6. A method for the interior and exterior covering of tubes or pipes according to any one of Claims 1 and 2, characterised in that after the separation of the tubes or pipes and before their interior covering, the exterior covering is removed by brushing over about 1 5 cm. at the extremities of the tubes or pipes, in that the extremities of the covering are provided with a chamfer of about 30' by brushing, and in that the extremities of the tubes or pipes are cleaned by brushing of the chamfers and stubs.
7. An apparatus for carrying out the method according to Claim 6, and in accordance with any one of Claims 3 to 5, characterised in that the station for the cleaning of the extremities of the tubes or pipes is constituted, for each tube or pipe extremity, by a radial brush disposed parallel with the axis of the tube or pipe and cleaning the latter over about 1 5 cm., by a first axial brush disposed with an inclination of about 30 in relation to to the axis of the tube or pipe and permitting the formation of a chamfer on the extremity of the covering, and by a second axial brush disposed at the extremity of the tube or pipe with an inclination in relation to the axis corresponding to the angle of the chamfer of the tube or pipe.
8. A method of applying interior or exterior coverings to tubes or pipes, substantially as hereinbefore described.
9. An apparatus for applying interior or exterior coverings to tubes or pipes, substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7904920A FR2449841A1 (en) | 1979-02-20 | 1979-02-20 | Coating metallic pipes internally and externally with plastics - by preheating pipes, cleaning pipes by blasting , covering with epoxy! resin so flexible joints form between pipes and cooling |
| FR7914244A FR2458023A2 (en) | 1979-05-28 | 1979-05-28 | Coating metallic pipes internally and externally with plastics - by preheating pipes, cleaning pipes by blasting , covering with epoxy! resin so flexible joints form between pipes and cooling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2042374A true GB2042374A (en) | 1980-09-24 |
| GB2042374B GB2042374B (en) | 1983-07-20 |
Family
ID=26221038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7930143A Expired GB2042374B (en) | 1979-02-20 | 1979-08-30 | Applying interior and exterior coverings to tubes or pipes |
Country Status (7)
| Country | Link |
|---|---|
| AR (1) | AR218006A1 (en) |
| DE (1) | DE2948898C2 (en) |
| DK (1) | DK350279A (en) |
| ES (2) | ES486961A1 (en) |
| GB (1) | GB2042374B (en) |
| IT (1) | IT1136129B (en) |
| NL (1) | NL7906331A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0232331A1 (en) * | 1985-07-31 | 1987-08-19 | Ross Leslie Palmer | Roll forming of metal articles. |
| GB2366750A (en) * | 2000-08-08 | 2002-03-20 | Jactone Products Ltd | Method of coating safety equipment |
| CN100580185C (en) * | 2007-01-18 | 2010-01-13 | 徐州正菱涂装有限公司 | Old plastic-spraying highway rail plate rebuild process |
| CN107497633A (en) * | 2017-08-11 | 2017-12-22 | 嘉兴晟友机械科技有限公司 | A kind of oil sealing inner ring and the oiling device of outer ring |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4230934A1 (en) * | 1992-09-16 | 1994-03-17 | Robert Wilhelm Heiliger | Process for coating a cut pipe on the inside and outside |
| DE102017106979A1 (en) * | 2017-03-31 | 2018-10-04 | Doege Beteiligungs Gmbh | Process for pipe coating and coating equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1127257B (en) * | 1958-10-04 | 1962-04-05 | Mannesmann Ag | Process for the production of protective coatings on metallic bodies, e.g. Pipes, by applying epoxy resins in powder form |
| AT277677B (en) * | 1965-12-10 | 1970-01-12 | Mannesmann Ag | Method for preparing insulation of plastic-sheathed steel pipeline |
| US3733677A (en) * | 1970-09-29 | 1973-05-22 | Johns Manville | Apparatus and method to produce cylindrical articles |
| DE2257135C3 (en) * | 1972-11-17 | 1975-07-31 | Mannesmann Ag, 4000 Duesseldorf | Method for producing a composite pipe consisting of a metallic core tube and a thermoplastic plastic jacket |
-
1979
- 1979-08-21 NL NL7906331A patent/NL7906331A/en not_active Application Discontinuation
- 1979-08-22 DK DK350279A patent/DK350279A/en not_active Application Discontinuation
- 1979-08-30 GB GB7930143A patent/GB2042374B/en not_active Expired
- 1979-12-05 DE DE2948898A patent/DE2948898C2/en not_active Expired
- 1979-12-17 ES ES486961A patent/ES486961A1/en not_active Expired
- 1979-12-17 ES ES486962A patent/ES486962A1/en not_active Expired
-
1980
- 1980-02-19 IT IT12446/80A patent/IT1136129B/en active
- 1980-02-19 AR AR280001A patent/AR218006A1/en active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0232331A1 (en) * | 1985-07-31 | 1987-08-19 | Ross Leslie Palmer | Roll forming of metal articles. |
| US4768280A (en) * | 1985-07-31 | 1988-09-06 | Palmer Tube Mills (Aust.) Pty. Ltd. | Roll forming of metal articles |
| EP0232331A4 (en) * | 1985-07-31 | 1989-03-14 | Ross Leslie Palmer | Roll forming of metal articles. |
| GB2366750A (en) * | 2000-08-08 | 2002-03-20 | Jactone Products Ltd | Method of coating safety equipment |
| CN100580185C (en) * | 2007-01-18 | 2010-01-13 | 徐州正菱涂装有限公司 | Old plastic-spraying highway rail plate rebuild process |
| CN107497633A (en) * | 2017-08-11 | 2017-12-22 | 嘉兴晟友机械科技有限公司 | A kind of oil sealing inner ring and the oiling device of outer ring |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2042374B (en) | 1983-07-20 |
| IT8012446A0 (en) | 1980-02-19 |
| AR218006A1 (en) | 1980-04-30 |
| DK350279A (en) | 1980-08-21 |
| ES486961A1 (en) | 1980-05-16 |
| NL7906331A (en) | 1980-08-22 |
| DE2948898C2 (en) | 1988-03-24 |
| ES486962A1 (en) | 1980-06-16 |
| DE2948898A1 (en) | 1980-08-28 |
| IT1136129B (en) | 1986-08-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |