GB1600149A - Closure and coupling caps made of plastics material for the ends of steel tubes which are to be coated with thermoplastics - Google Patents
Closure and coupling caps made of plastics material for the ends of steel tubes which are to be coated with thermoplastics Download PDFInfo
- Publication number
- GB1600149A GB1600149A GB26005/78A GB2600578A GB1600149A GB 1600149 A GB1600149 A GB 1600149A GB 26005/78 A GB26005/78 A GB 26005/78A GB 2600578 A GB2600578 A GB 2600578A GB 1600149 A GB1600149 A GB 1600149A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cap
- tube
- caps
- tubes
- projection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000008878 coupling Effects 0.000 title claims description 11
- 238000010168 coupling process Methods 0.000 title claims description 11
- 238000005859 coupling reaction Methods 0.000 title claims description 11
- 239000000463 material Substances 0.000 title claims description 11
- 239000004033 plastic Substances 0.000 title claims description 7
- 229920003023 plastic Polymers 0.000 title claims description 7
- 229920001169 thermoplastic Polymers 0.000 title claims description 6
- 239000004416 thermosoftening plastic Substances 0.000 title claims description 6
- 229910000831 Steel Inorganic materials 0.000 title description 5
- 239000010959 steel Substances 0.000 title description 5
- 238000000576 coating method Methods 0.000 claims description 20
- 239000011248 coating agent Substances 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 15
- 239000003112 inhibitor Substances 0.000 claims description 13
- 238000005260 corrosion Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000013022 venting Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- 238000005488 sandblasting Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D59/00—Plugs, sleeves, caps, or like rigid or semi-rigid elements for protecting parts of articles or for bundling articles, e.g. protectors for screw-threads, end caps for tubes or for bundling rod-shaped articles
- B65D59/06—Caps
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
- F16B7/04—Clamping or clipping connections
- F16B7/0406—Clamping or clipping connections for rods or tubes being coaxial
- F16B7/0413—Clamping or clipping connections for rods or tubes being coaxial for tubes using the innerside thereof
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/005—Protection of pipes or objects of similar shape against external or internal damage or wear specially adapted for the ends of pipes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Pipe Accessories (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Description
(54) CLOSURE AND COUPLING CAPS MADE OF PLASTICS
MATERIAL FOR THE ENDS OF STEEL TUBES WHICH
ARE TO BE COATED WITH THERMOPLASTICS
(71) We, MANNESMANN AKTIENGESELL
SCHAFT, a joint stock company of Germany, of 4 Dusseldorf 1, Mannesmannufer 2,
Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to closure caps preferably made of a plastics material for the ends of steel tubes which are to be coated with thermoplastics material.The closure caps are intended to provide protection against soiling and corrosion of the internal tube surface during the coating of individual tubes and also to act as coupling elements for the tube ends which are brought together to form a line of tubing or piping, each cap having a projection engagable in a correspondingly constructed recess of a neighbouring cap, and having apertures for venting the tubes.
German Patent Nos. 1575207 and 2523020, disclose caps with which a coupling can be formed which is suitable for uniting steel tubes together to form a line of tubing which can be taken continuously through the head of an extruder for the purpose of coating with a layer of thermoplastics material. The coupling comprises two differently shaped plastics material caps which can be placed on the tube ends, one of which comprising a cupshaped recess in which there engages a correspondingly shaped projection on-the other cap. The caps of German Patent No. 2523020 comprise at their internal side, an annular projection which engages the internal surface of the tube ends and which ensures that the caps have a secure seating on the tube ends.
In the bases of the caps there are provided apertures for venting the tubes.
We have sought to provide an improvement in known plastics material caps to make it possible to protect the interior of the steel tubes, between the production stage of the tubes and the time they are coated, against corrosion and soiling, particularly against the action of moisture and the penetration of blasting grit when the tube surface is blasted before coating. We have also sought to make it possible for the interior of the steel tubes to be sealed at the time of coating so as to maintain a vacuum produced in a shown manner between the coating and tube for the purpose of producing a sealing-tight application of the tubular coating against the external surface of the tube.Finally, we have sought to ensure that the tubes remain protected against soiling, the penetration of moisture and resulting corrosion even after they have been coated, for example, whilst they are being stored.
Accordingly the present invention provides a closure cap for a tube end which comprises a projection and/or recess adapted to engage in a correspondingly shaped projection and/or recess of another cap, and having a base which is provided on the side towards the tube interior with an inhibitor substance to provide the internal surfaces of the tube with protection against corrosion.
Preferably, the base has an aperture for venting the tube which is formed by partially pressing out a portion of the base, which portion then forms an obliquely positioned cover for the aperture.
Preferably, the caps is made of a polyamide, whose water content when placed on the tube end is greater than the equilibrium valve which obtains under ambient conditions of 20"C and 65% relative humidity.
The invention is further illustrated in the accompanying drawings, wherein:
Figure 1 shows a coupling of two tubes with two differently shaped caps;
Figures 2 to 4 each show a coupling cap with set-back bases;
Figs. 5 to 7 show two identical coupling caps in engagement with differently shaped projections.
As shown in Figure 1, closure and coupling caps 3 and 4 are fitted over tube ends 1 and 2.
Bases 5 and 6 respectively of caps 3 and 4 have apertures 7 for venting the tubes. The base 5 of cap 3 is set back into the tube, whilst the base 6 of cap 4 is constructed in the form of a projection 8 which engages in the recess of cap 3. On the internal side of each cap base, an inhibitor substance in the form of tablets 9 is located within a screen-like case 10.
Conveniently, the inhibitor substance is composed of two components one of which has a vapour pressure sufficient for protection at room temperature and the other is volatile at temperatures between 100 and 200"C. The intention of this is to provide protection against corrosion for the internal surface of the tube during storage before further processing. Heating which is carried out during further processing, causes the inhibitor component having the relatively low vapour pressure to volatilise and when the tube is cooled, it condenses on the internal wall thereof. As a result, an additional inhibiting effect is obtained with substances which are not very volatile at ambient temperature.
The diameter of the apertures 7 is approximately 1 to 2% of the internal tube diameter, thus providing the possibility of removing substances, such as water and oil, which may be situated in the interior of the tube, and which evaporate when subjected to the heating which is carried out during further processing, without substantially affecting the vacuum between external tube surface and extruder head which is necessary for the proper carrying out of the coating process.
For the efficient removal of vapours, it is advantageous to provide as shown in Figure 1 of the drawings, a sufficiently large crosssection between each two neighbouring caps for the passage of vapours from one tube to the other. As shown in Figure 2, tongue-like surfaces 11 which project from the bases of the caps and which cover the apertures obliquely, are provided to protect the apertures 7 against the entry of dirt or moisture, such as driving rain whilst the tubes are being stored. When the tubes are being stored and during pre-treatment such as sand blasting of the tubes before coating, it is advisable to keep the apertures 7 closed and only to open them just before coating.For this purpose, as Figure 2 shows, it is proposed that the surfaces 11 engage with thin webs 12 with a sealing action over the apertures 7, or as shown in Figures 3 and 4, that the surfaces 11 are situated in the opening plane and are held therein by a reduced wall portion 13 of the cap base 5. These webs or reduced wall portions are pierced directly before coating thereby freeing the apertures.
As shown in Figure 5 in longitudinal section and in plan view in Figure 6, the tube ends I and 2 can be coupled by arranging that each of the caps 3 and 4 comprise, in an identically shaped arrangement, a projection 14 and a corresponding recess 15, these being formed by partial bulges in the bases.
In this way, it is also possible to form two or more projections or recesses respectively, depending on the diameter size of the tubes.
When using standardised caps with identically shaped recesses 16 (Fig. 7), the projection is formed by inserting a hollow cylindrical shaped element 17 into one of the caps 3 or 4, to bring the tube ends 1 and 2 together.
The closure caps of the invention are suitable not only in connection with coating the tubes with a tubular coating, but also in connection with the wrapping of the tubes with a thermoplastics material which is extruded as a strip. It is also possible to coat tubes which are provided with a socket at one end, this not being shown here, with caps adapted to the two different diameters. After coating is carried out, the coupling regions are severed and the caps remain to protect the tubes.
WHAT WE CLAIM IS:- 1. A closure cap for a tube end which comprises a projection and/or recess adapted to engage in a correspondingly shaped projection and/or recess of another cap, and having a base which is provided on the side towards the tube interior with an inhibitor substance to provide the internal surfaces of the tube with protection against corrosion.
2. A closure cap as claimed in Claim 1, wherein the base has an aperture for venting the tube which is formed by partially pressing out a portion of the base, which portion then forms an obliquely positioned cover for the aperture.
3. A closure cap as claimed in Claim 2, wherein the diameter of the aperture amounts to up to 2% of the internal tube diameter.
4. A closure cap as claimed in any of claims 1 to 3, wherein the inhibitor substance is in the form of a tablet in a screen-like case connected securely to the base of the cap.
5. A closure cap as claimed in Claim 4, wherein the inhibitor substance is composed of two components, one of which has a vapour pressure which is adequate for protection at room temperature and the other is volatile at temperatures between 100 C and 200"C.
6. A closure cap as claimed in any one of claims 1 to 5, wherein the projection of the cap is formed as a bulge in part of the cap base adapted to engage in a corresponding recess of another cap.
7. A closure cap as claimed in any one of claims I to 5, wherein the cap has a recess adapted to receive a projection formed by a hollow cylindricaI shaped element
8. A closure cap as claimed in any one of
Claims 1 to 7 formed of a plastics material.
9. A closure cap as claimed in Claim 8, wherein the cap is made of a polyamide, whose water content when placed on the tube
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. A closure cap for a tube end which comprises a projection and/or recess adapted to engage in a correspondingly shaped projection and/or recess of another cap, and having a base which is provided on the side towards the tube interior with an inhibitor substance to provide the internal surfaces of the tube with protection against corrosion.
2. A closure cap as claimed in Claim 1, wherein the base has an aperture for venting the tube which is formed by partially pressing out a portion of the base, which portion then forms an obliquely positioned cover for the aperture.
3. A closure cap as claimed in Claim 2, wherein the diameter of the aperture amounts to up to 2% of the internal tube diameter.
4. A closure cap as claimed in any of claims 1 to 3, wherein the inhibitor substance is in the form of a tablet in a screen-like case connected securely to the base of the cap.
5. A closure cap as claimed in Claim 4, wherein the inhibitor substance is composed of two components, one of which has a vapour pressure which is adequate for protection at room temperature and the other is volatile at temperatures between 100 C and 200"C.
6. A closure cap as claimed in any one of claims 1 to 5, wherein the projection of the cap is formed as a bulge in part of the cap base adapted to engage in a corresponding recess of another cap.
7. A closure cap as claimed in any one of claims I to 5, wherein the cap has a recess adapted to receive a projection formed by a hollow cylindricaI shaped element
8. A closure cap as claimed in any one of
Claims 1 to 7 formed of a plastics material.
9. A closure cap as claimed in Claim 8, wherein the cap is made of a polyamide, whose water content when placed on the tube
end is greater than the equilibrium value which obtains under ambient conditions of 20 C and 65 /e relative humidity.
10. A closure cap substantially as herein described and with reference to the accompanying Drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2728498A DE2728498C2 (en) | 1977-06-22 | 1977-06-22 | Sealing and coupling caps made of plastic for the ends of steel pipes to be coated with thermoplastic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1600149A true GB1600149A (en) | 1981-10-14 |
Family
ID=6012276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26005/78A Expired GB1600149A (en) | 1977-06-22 | 1978-05-31 | Closure and coupling caps made of plastics material for the ends of steel tubes which are to be coated with thermoplastics |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE868275A (en) |
| DE (1) | DE2728498C2 (en) |
| FR (1) | FR2395204A1 (en) |
| GB (1) | GB1600149A (en) |
| IT (1) | IT1095237B (en) |
| NL (1) | NL182167C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2208416A (en) * | 1987-08-05 | 1989-03-30 | British Gas Plc | Connecting pipes |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3528682A1 (en) * | 1985-08-07 | 1987-02-12 | Mannesmann Ag | METHOD FOR REMOVING A PLASTIC INSULATING LAYER FROM STEEL TUBE ENDS |
| DE3829070A1 (en) * | 1988-08-25 | 1990-03-08 | Mannesmann Ag | Closure caps for plastic-coated steel pipes |
| DE3833376A1 (en) * | 1988-09-28 | 1990-04-05 | Mannesmann Ag | Closure caps for plastic-coated steel pipes |
| DE4207375C2 (en) * | 1992-03-09 | 1994-10-27 | Mhp Mannesmann Hoesch Praezisr | Coupling for temporarily coaxial connection of single pipes |
| DE29507705U1 (en) * | 1995-05-14 | 1995-08-24 | Schäfer, Wilhelm, 35745 Herborn | Device for covering edges on pipe ends |
| DE19814632C1 (en) * | 1998-03-26 | 1999-10-14 | Mannesmann Ag | Method and device for applying a protective layer on an elongated body, in particular wire or tube |
| DE102007028783A1 (en) | 2007-06-22 | 2008-12-24 | Veritas Ag | closure element |
| CN105438631A (en) * | 2014-09-03 | 2016-03-30 | 天津市津英达塑料制品有限责任公司 | Thread protector structure with reinforcing steel lining |
-
1977
- 1977-06-22 DE DE2728498A patent/DE2728498C2/en not_active Expired
-
1978
- 1978-04-25 NL NLAANVRAGE7804373,A patent/NL182167C/en not_active IP Right Cessation
- 1978-04-28 IT IT22826/78A patent/IT1095237B/en active
- 1978-05-31 GB GB26005/78A patent/GB1600149A/en not_active Expired
- 1978-06-16 FR FR7818069A patent/FR2395204A1/en active Granted
- 1978-06-20 BE BE188695A patent/BE868275A/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2208416A (en) * | 1987-08-05 | 1989-03-30 | British Gas Plc | Connecting pipes |
| GB2208416B (en) * | 1987-08-05 | 1991-05-29 | British Gas Plc | Device for permitting a first length of previously commissioned main to be extended by connecting a second length of main thereto |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7822826A0 (en) | 1978-04-28 |
| DE2728498B1 (en) | 1978-10-26 |
| DE2728498C2 (en) | 1979-06-28 |
| NL182167C (en) | 1988-01-18 |
| FR2395204A1 (en) | 1979-01-19 |
| IT1095237B (en) | 1985-08-10 |
| NL182167B (en) | 1987-08-17 |
| NL7804373A (en) | 1978-12-28 |
| FR2395204B1 (en) | 1983-11-10 |
| BE868275A (en) | 1978-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |