GB2044390A - Metal Lined Polymeric Pipe - Google Patents

Metal Lined Polymeric Pipe Download PDF

Info

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
Application number
GB8008153A
Other versions
GB2044390B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ARNONE I
Original Assignee
ARNONE I
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 ARNONE I filed Critical ARNONE I
Publication of GB2044390A publication Critical patent/GB2044390A/en
Application granted granted Critical
Publication of GB2044390B publication Critical patent/GB2044390B/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00Rigid pipes
    • F16L9/14Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F16L9/147Compound 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)

Claims
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.
GB8008153A 1979-03-19 1980-03-11 Metal lined polymeric Expired GB2044390B (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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