GB2044390A - Metal Lined Polymeric Pipe - Google Patents
Metal Lined Polymeric Pipe Download PDFInfo
- Publication number
- GB2044390A GB2044390A GB8008153A GB8008153A GB2044390A GB 2044390 A GB2044390 A GB 2044390A GB 8008153 A GB8008153 A GB 8008153A GB 8008153 A GB8008153 A GB 8008153A GB 2044390 A GB2044390 A GB 2044390A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- polyethylene
- copper
- thickness
- pipe
- 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
- 229910052751 metal Inorganic materials 0.000 title description 7
- 239000002184 metal Substances 0.000 title description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052802 copper Inorganic materials 0.000 claims abstract description 29
- 239000010949 copper Substances 0.000 claims abstract description 29
- 229920000573 polyethylene Polymers 0.000 claims abstract description 21
- 231100000252 nontoxic Toxicity 0.000 claims abstract description 7
- 230000003000 nontoxic effect Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 5
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 5
- 239000006260 foam Substances 0.000 claims abstract description 3
- 239000004698 Polyethylene Substances 0.000 claims description 20
- -1 polyethylene Polymers 0.000 claims description 20
- 229920000642 polymer Polymers 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 230000001464 adherent effect Effects 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Laminated Bodies (AREA)
- Thermal Insulation (AREA)
Abstract
A pipe for carrying liquids in heating or sanitary plants comprises an elastic, non-toxic, polymeric tube such as high density polyethylene and an inner, adhering copper sheath having a thickness from 2-30% of the thickness of the polymeric tube. An outer coating of polythene foam may be applied to the polymeric tube. The outer surface of the copper sheath may be smooth, corrugated, or knurled to improve adhesion.
Description
SPECIFICATION
Improved Pipe for Carrying Liquids in Heating and Sanitary Plants
The present invention relates a pipe for carrying liquids to be used in heating, air conditioning, sanitary plants and the like. It is well known to employ metal pipes (such as copper, galvanized iron, aluminum, etc.) to carry hot and/or cold water or other liquids in plants mainly for civil or industrial uses.
Known metal pipes have a number of shortcomings since copper and aluminum pipes are expensive due to the amount of valuable material employed and are easily crushed, iron and steel pipes are difficult to be bent and jointed upon installing. Iron pipes deteriorate in a relatively short time due to the electrical connection between iron and other metal alloys.
Moreover metal pipes are generally attacked by concrete and their corrosion, regardless of the causes, require the replacement of the damaged and leaking portions.
There have been used in the art copper pipes coated with a plastic material, for example PVC, that however tends to come off due to aging and crystallizing particularly when the pipes carry hot water.
Recently there have been proposed pipes exclusively formed by a polymer of ethyl (reticular polyethylene) that, although reducing the inconveniences of the completely metal pipes, such as the high cost and the electrochemical effects, are scarcely ductile, relatively troublesome to be installed and above all they are not completely reliable for carrying high pressure fluids. In particular said polyethylene pipes cannot be cold bent (and keep the bending) without an outer support owing to their elastic properties. Of course a heat bending requires further apparatuses and complications (for example an inner core).
It is therefore an object of the present invention to realize an improved pipe suitable for use in heating or sanitary plants which is free of the above inconveniences and particularly a pipe which is easy to be installed and bent, quite ductile, resistant to abrasion, high temperatures and pressures as well as to corrosion.
It is still another object of the invention to realize an improved pipe which is completely non toxic, with a lower thermal conductibility, long lasting and economically advantageous with respect to the plastic coated copper pipes actually employed.
The pipe according to the invention comprises a tube of an elastic, non toxic polymer, preferably high density polyethylene, and an inner sticking copper sheath having a thickness comprised between 2% and 30% of the thickness of the polyethylene surrounding tube and preferably between 5% and 25% of said thickness.
The invention will be described in some non limiting embodiments, with reference to the attached drawings in which:
Figure 1 illustrates a portion of the improved pipe according to the invention; and
Figure 2 illustrates another embodiment of the pipe of Fig. 1 coated with an outer sheath of insulating material.
Referring now to Fig. 1, the pipe of the invention comprises a tubular supporting structure or body 1 of high density polyethylene (simple or reticular) or other elastic, non toxic polymer having a copper sheath or hollow core 2 applied to the inner surface of the polyethylene tube by drawing.
The thickness of said thin continuous copper sheath is variable depending on the thickness, and therefore the diameter of the polyethylene tube. However, it has been found that the best ratio between the thickness of the copper sheath and the polyethylene tubes is between 0.05 and 0.25 (i.e. between 5% and 25%). More particularly said copper thickness can vary between 0.25 mm for pipes having an outer diameter of about 10-12 mm up to about 0.50 mm of copper thickness for pipes having an outer diameter of about 40 mm. In fact, higher values for the copper thickness raise the final cost without adding an appreciable increase of the pressure resistance, whereas lower thickness of the copper sheath are difficult to be obtained and produce a weak pipe.
Moreover, in the preferred range of thickness, the resulting pipe can be bent easily and retains the bending thanks to the hollow core formed by the copper sheath. Said sheath is preferably applied by using a copper tube (of the type known as DHP 99.9%) which is made to adhere to the inner polyethylene tube by drawing.
The pipe of the invention besides exhibiting all the advantages of the copper, such as a high resistance to pressure and corrosion, shows features of low price due to the small amount of valuable metal per linear unit of pipe, as well as a high thermal insulation thanks to the outer portion of polyethylene. Furthermore it can be easily jointed by means of conventional metal linear and curved joints, it is completely protected against corrosion, ductile and yet resistant to crushing and easy to install. Owing to its structure, it is also possible to interrupt the electrical continuity of a pipework, at the joints, thereby reducing the corrosive effects of electrical and electrochemical nature.
Referring now to Fig. 2 an embodiment of the pipe according to the invention will now be illustrated that provides for an additional outer coating 3 of plastic material such as polyethylene foam or the like, suitable to further improve the insulating properties of the high density polyethylene (having a thermal conductibility of 0.33). Such outer insulating sheath allows to obtain a high insulation pipe (from both cold and heat) meeting the requirements of the modern techniques.
It is to be understood that a pipe according to the invention has a long endurance when compared to the amount of copper employed and therefore to its cost. In fact the double layer formed by the inner copper sheath and the polyethylene tube confers a very good sealing property even in case of a local breaking of the inner copper sheath since the outer polyethylene tube is enough to prevent any leakage from the plant in the usual pressure and temperature ranges without fouling the carried liquid, being non toxic.
In the figures the copper sheath has been illustrated as smooth, but it is possible to realize the outer surface of the copper, the one adhering to the polyethylene tube, as corrugated, knurled or however provided with projections or protrusion apt to improve the sticking of the sheath to the polyethylene tube whereby allowing a better flexibility of the pipe without detachment.
Although only a few particular embodiments have been illustrated, it is to be understood that modifications and/or changes coming within the scope of the invention, are possible, which provide anyhow the applying of an inner thin copper sheath to a high density polymeric tube for use in heating or sanitary plants.
Claims (7)
1. A pipe for carrying liquids in heating or sanitary plants characterized in that it comprises a tubular body (1) of an elastic, non toxic polymer and an inner adherent copper sheath (2) having a thickness from 0.05 to 0.25 of the thickness of said polymeric tube.
2. A pipe according to claim 1, characterized in that said elastic non toxic polymer is high density polyethylene and copper is 99.9% pure having a thickness from 0.25 to 0.50 mm applied to the polyethylene tube by drawing.
3. A pipe according to claim 2, characterized in that said polyethylene tube (1) is externally coated with a sheath (3) of plastic material such as polyethylene foam.
4. A pipe according to claim 2, characterized in that the surface of the copper sheath in contact with the polyethylene tube is smooth.
5. A pipe according to claim 3, characterized in that the surface of the copper sheath in contact with the polyethylene tube is smooth.
6. A tube according to claim 2, characterized in that the surface of the copper sheath in contact with the polyethylene tube is corrugated or knurled.
7. A tube according to claim 3, characterized in that the surface of the copper sheath in contact with the polyethylene tube is corrugated or knurled.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT7942014A IT7942014A0 (en) | 1979-03-19 | 1979-03-19 | NEW TUBE IN POLYCAST POLYMERS ON COPPER SHEATH |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2044390A true GB2044390A (en) | 1980-10-15 |
| GB2044390B GB2044390B (en) | 1983-06-15 |
Family
ID=11253729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8008153A Expired GB2044390B (en) | 1979-03-19 | 1980-03-11 | Metal lined polymeric |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS55129685A (en) |
| DE (1) | DE3009326A1 (en) |
| ES (1) | ES256770Y (en) |
| FR (1) | FR2452047A1 (en) |
| GB (1) | GB2044390B (en) |
| GR (1) | GR66623B (en) |
| IT (1) | IT7942014A0 (en) |
| NL (1) | NL8001639A (en) |
| SE (1) | SE8002088L (en) |
| YU (1) | YU74080A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9210769U1 (en) * | 1992-08-12 | 1992-10-08 | Unicor Suhler Maschinenfabrik GmbH, O-6000 Suhl | Multilayer composite pipe |
| EP0690255A1 (en) * | 1994-07-01 | 1996-01-03 | Draftex Industries Limited | Pipes for fluid flow and methods of making them |
| WO1999031424A1 (en) * | 1997-12-16 | 1999-06-24 | Zetaesse S.P.A. | Composite pipe made of metal-plastic for hydro-thermo-sanitary plants and method for the production thereof |
| CN105889650A (en) * | 2014-12-29 | 2016-08-24 | 宁波优道管业有限公司 | Full-copper water touching composite plastic stop valve |
| CN105889662A (en) * | 2014-10-28 | 2016-08-24 | 宁波优道管业有限公司 | All-copper water touching plastic-compounded movable joint |
| CN105889649A (en) * | 2014-09-18 | 2016-08-24 | 宁波优道管业有限公司 | A copper pipe-PPR water supply extrusion pipe material and pipe fitting |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT393011B (en) * | 1988-07-22 | 1991-07-25 | Raimund Harreither Heizungs Un | Pipe element |
| DE10249454A1 (en) * | 2002-10-24 | 2004-05-19 | Wieland-Werke Ag | Insulated pipe for use in sanitary and heating systems |
| DE102005017625A1 (en) * | 2005-04-15 | 2006-10-26 | Aquacarat Gmbh | Device for disinfecting water and method for its installation |
| DE102006018466A1 (en) * | 2006-04-19 | 2007-10-25 | Viega Gmbh & Co. Kg | Composite pipe with deformable layer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT306463B (en) * | 1968-03-15 | 1973-04-10 | Ver Deutsche Metallwerke Ag | Thermally insulated tube made of metal |
| DE2461013C3 (en) * | 1974-12-21 | 1982-01-07 | Wieland-Werke Ag, 7900 Ulm | Thermally insulated composite pipe consisting of a metal pipe and a plastic jacket |
-
1979
- 1979-03-19 IT IT7942014A patent/IT7942014A0/en unknown
-
1980
- 1980-03-11 GB GB8008153A patent/GB2044390B/en not_active Expired
- 1980-03-11 DE DE19803009326 patent/DE3009326A1/en not_active Withdrawn
- 1980-03-14 GR GR61446A patent/GR66623B/el unknown
- 1980-03-18 JP JP3465880A patent/JPS55129685A/en active Pending
- 1980-03-18 FR FR8007121A patent/FR2452047A1/en not_active Withdrawn
- 1980-03-18 ES ES1980256770U patent/ES256770Y/en not_active Expired
- 1980-03-18 SE SE8002088A patent/SE8002088L/en not_active Application Discontinuation
- 1980-03-18 YU YU00740/80A patent/YU74080A/en unknown
- 1980-03-19 NL NL8001639A patent/NL8001639A/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9210769U1 (en) * | 1992-08-12 | 1992-10-08 | Unicor Suhler Maschinenfabrik GmbH, O-6000 Suhl | Multilayer composite pipe |
| EP0690255A1 (en) * | 1994-07-01 | 1996-01-03 | Draftex Industries Limited | Pipes for fluid flow and methods of making them |
| WO1999031424A1 (en) * | 1997-12-16 | 1999-06-24 | Zetaesse S.P.A. | Composite pipe made of metal-plastic for hydro-thermo-sanitary plants and method for the production thereof |
| CN105889649A (en) * | 2014-09-18 | 2016-08-24 | 宁波优道管业有限公司 | A copper pipe-PPR water supply extrusion pipe material and pipe fitting |
| CN105889662A (en) * | 2014-10-28 | 2016-08-24 | 宁波优道管业有限公司 | All-copper water touching plastic-compounded movable joint |
| CN105889650A (en) * | 2014-12-29 | 2016-08-24 | 宁波优道管业有限公司 | Full-copper water touching composite plastic stop valve |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2044390B (en) | 1983-06-15 |
| DE3009326A1 (en) | 1980-10-02 |
| ES256770Y (en) | 1982-04-16 |
| YU74080A (en) | 1983-01-21 |
| ES256770U (en) | 1981-10-16 |
| FR2452047A1 (en) | 1980-10-17 |
| GR66623B (en) | 1981-04-03 |
| SE8002088L (en) | 1980-09-20 |
| JPS55129685A (en) | 1980-10-07 |
| IT7942014A0 (en) | 1979-03-19 |
| NL8001639A (en) | 1980-09-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2044390A (en) | Metal Lined Polymeric Pipe | |
| US6539981B1 (en) | Flow tube having a bonding layer with a fluoropolymer lining | |
| US3415287A (en) | Protective covering and article | |
| CA2496069C (en) | Heated conduit | |
| CN110375150B (en) | Self-cleaning pipeline | |
| RU2224160C2 (en) | Multilayer pipe and system of pipes for water in water and heat supply systems | |
| CA1260375A (en) | Composite pipes and process for manufacturing the same | |
| CN2497131Y (en) | Inner-coated stainless steel water-purifying pipe | |
| JP2000352482A (en) | Resin covered flexible pipe | |
| SE506523C2 (en) | Thermally insulated piping system, method for laying the pipes and device for connecting the pipes | |
| JP5189235B2 (en) | Weatherproof flexible hose | |
| CN219954526U (en) | Novel water pipe with heat preservation performance | |
| RU32233U1 (en) | ANTI-CORROSION INSULATION TAPE | |
| CN219828027U (en) | Thermal insulation frost prevention corrugated pipe | |
| CA2352429A1 (en) | Pipe fitting for inside coated pipes and method for its installation | |
| JPH02203099A (en) | Heat insulating pipe with internal surface paint film | |
| CN220688282U (en) | Prefabricated heat preservation bellows of steel sheath | |
| CN215173284U (en) | High-temperature-resistant and corrosion-resistant insulation mark heat-shrinkable tube | |
| RU65893U1 (en) | DEVICE FOR PROTECTOR PROTECTION | |
| Mitchell | Corrosion Under Insulation-New Approaches to Coating and Insulation Materials | |
| RU49601U1 (en) | ANTI-CORROSION INSULATION TAPE | |
| GB2324585A (en) | Heated hoses | |
| CN2049723U (en) | Buried corrosion-proof insulating pipe | |
| Ryndin et al. | Analysis of passive methods of protection from corrosion of main oil and gas pipelines | |
| RU21231U1 (en) | ANTI-CORROSION INSULATION TAPE |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |