Source: http://www.google.com/patents/US3943273?dq=6101531
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Patent US3943273 - Electrically conducting plastic pipe system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA conducting plastic pipe system comprising a male plastic pipe part and a female plastic pipe part with conducting covering layers which are interconnected by means of a conducting sealing ring between the male and female part. In case of outer covering layers on the pipe part the covering layer extends...http://www.google.com/patents/US3943273?utm_source=gb-gplus-sharePatent US3943273 - Electrically conducting plastic pipe systemAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS3943273 APublication typeGrantApplication numberUS 05/447,582Publication dateMar 9, 1976Filing dateMar 4, 1974Priority dateMar 3, 1973Also published asCA1012584A, CA1012584A1, DE7308162UPublication number05447582, 447582, US 3943273 A, US 3943273A, US-A-3943273, US3943273 A, US3943273AInventorsWarner Jan de PutterOriginal AssigneeWavin B.V.Export CitationBiBTeX, EndNote, RefManPatent Citations (9), Referenced by (33), Classifications (17) External Links: USPTO, USPTO Assignment, EspacenetElectrically conducting plastic pipe system
US 3943273 AAbstract
A conducting plastic pipe system comprising a male plastic pipe part and a female plastic pipe part with conducting covering layers which are interconnected by means of a conducting sealing ring between the male and female part. In case of outer covering layers on the pipe part the covering layer extends onto the inner side of the muff end of the female pipe part.
1. A pipe connection comprising a male pipe part and a female pipe part both of thermoplastic material, each pipe part having on at least its outer surface a continuous coating of thermosetting material connected with the surface of the male and female pipe part, said coating containing a quantity of particles that are electrically conductive, said coating on each pipe part being connected with means for discharging an electric charge, and a conductive rubber sealing ring engaging the outer coating on said male pipe part and the outer coating on said female pipe part by a part of said coating extending on the inner side of said female part.
2. A pipe connection according to claim 1, characterized in that said sealing ring contains carbon particles of a range from 10 to 20% of carbon particles.
3. A pipe connection according to claim 2, characterized in that the thermoplastic female pipe part consists of a pipe part having a socket formed thereon, while said conductive coating extends throughout the outer surface and on the inner surface of the socket part.
4. A pipe connection according to claim 1, characterized in that the pipe connection is grounded.
The invention relates to a plastic pipe system with at least a first and a second pipe, constituting a pipeline, and preferably a pipe system which comprises at least a male pipe part and a female pipe part and in addition a sealing member between the male part and the female part.
Such plastic pipe systems are commonly known. These systems have the drawback that when dry media, like air and air enriched with dust particles are transmitted through such plastic pipe systems, electric charges accumulate on the inner and outer surfaces of the plastic pipe parts whereby the pipe system is statically charged. As a consequence, there is little demand for such pipe systems manufactured from plastic when they should be employed at locations whereat the static charges could give rise to explosions, like in shafts, etc.
Attempts have been made to overcome this trouble by wrapping with a conductive synthetic foil which is less statically charged, but in practice this could only be realized with difficulty, while, moreover, the foils used are easily damaged so that the desired effect gets lost.
It has also been suggested to spray an antistatic lacquer on the plastic pipe parts, these lacquers have in general no proper adhesion and, moreover, loose their properties in the course of time, while, moreover, when these antistatic lacquers, are used, two consecutive pipe parts on account of the presence of an insulating sealing member between the male pipe part and the female pipe part are interconnected in a nonconducting way.
For this purpose it is therefore requisite to ground each plastic pipe individually by means of supports on which the pipes are secured, which implies, however, all kind of difficulties. It is an object of the invention to provide a plastic pipe system which has not the aforementioned drawbacks.
According to the invention this object is attained by the arrangment that each plastic pipe part is provided on its inner and/or outer side with a continuous top coat which is fully connected with the surface of the pipe and which adheres thereto, while this coating of each plastic pipe may be directly or indirectly connected with means discharging the electric charge.
The plastic pipe parts consist preferably of polyvinylchloride, while the plastic coating consists of a thermosetting resin layer with carbon particles which is modified so as to be capable of adhering to a thermoplastic material like polyvinylchloride.
The pipe system comprises preferably a sealing member consisting of an elastic or plastic conductive material, which is disposed between two consecutive pipe parts, while the sealing member cooperates with top coats of consecutive pipe parts.
It has been found that by means of such plastic pipe systems all so far experienced difficulties can be obviated while, moreover, a single ground connection for the plastic pipe system at the desired location suffices.
According to a preferred and very advantageous embodiment, the pipe system comprises a male pipe part and a female pipe part and a sealing member made of an elastomer with a quantity of carbon which ensures the electric conduction between the conductive top coat, cooperating with the sealing member, of the male pipe part and the top coat of the female pipe part. In this embodiment no provisions are required to connect the male pipe part in an electrically conducting way with the associated female pipe part, since the electric conduction between the top coats of the male pipe part and the female pipe part is achieved by means of a sealing member which preferably consists of a rubber ring which contains at least 10% and preferably about 20% of carbon particles.
In this case it is necessary that when an outer top coat is applied to the male pipe part and the female pipe part, then this top coat is continued on the inner side of the socket end of the female pipe part where this part contacts the aforementioned sealing ring.
In an advantageous way, a female pipe part with a socket formed thereon is used, while the top coat extends on the entire outer surface and on the inner side of the socket part of this plastic pipe part.
The invention relates also to a plastic pipe part adapted to be used in the plastic pipe system according to the invention and to a sealing member, particularly a sealing member adapted to be used in a plastic pipe system according to the invention.
The invention is clarified with reference to the drawing showing an embodiment.
FIG. 1 is a longitudinal cross-sectional view representing a plastic pipe system according to the invention wherein sockets are used as receiving pipe parts; and
FIG. 2 is a longitudinal sectional view through a connection in a plastic pipe system according to the invention wherein female pipe parts with sockets formed thereon are used.
In FIG. 1 is represented a number of male pipe parts 1 of polyvinylchloride, which, via female pipe parts 2 in the shape of plastic sockets made of polyvinylchloride, are interconnected. Between each male pipe part 1 and each female pipe part 2 is a sealing member in the shape of a rubber ring 8.
On each male pipe part 1 and each female pipe part 2 is sprayed on the outer side thereof a top coat 3 consisting of metal e.g. aluminum, possibly in a liquid plastic composition which is compatible with respect to the polyvinylchloride and adheres to the polyvinylchloride. Especially a modified epoxy resin can be used.
In order to obtain an electric conduction between the surface coatings 3 on the male pipe parts 1 and the female pipe parts 2 in the shape of sockets, thin metal strips 10 may be glued on the top coat surface 3 of the female pipe part 2 on the one hand and on the surface of the top coat 3 of the male pipe part 1 on the other hand. For this purpose aluminum foil may, e.g., be used.
The top coat 3 consists of epoxy resin as stated hereinbefore which is modified in such a way that it adheres to the polyvinylchloride, or, of another thermoplastic material which is used for the plastic pipe parts. In order to apply the synthetic top coat, a hardener and the desired quantity of soot particles and also an organic solvent are admixed to the modified epoxy resin, whereupon the mixture under a high pressure e.g. over 100 atmospheres is sprayed on the surface. It should be arranged for that no air inclusions appear in the top coat.
The whole pipe system is grounded by means of the ground connection 11.
Instead of the sockets 2, also plastic pipes 2a with a socket 4 formed thereon may be used, while pipes on their outer side are provided with the aforementioned conductive coating and the coating by its part 7 extends along the front side 5 of the socket end 4 and further on the inner side of the socket 4 while forming the coating 6 on the inner side.
On the other hand the male pipe part 1 of polyvinylchloride is likewise provided with the aforementioned top coat.
Between the female pipe part and the male pipe part is likewise disposed a sealing ring 8 partially accommodated in a groove 9, this sealing ring of elastomer material contains, however, a quantity of soot particles which suffices to ensure an electric conduction between the coating 3 of the male pipe part 1 and the part 6 of the coating on the socket part 4.
For this purpose this ring 8 of elastomer material contains at least 8% carbon particles and preferably at least 10% and particularly 20% carbon particles. Division Bostik
This quantity of soot particles is also suitable for a coating of modified epoxy resin with soot particles, (e.g. a Finch 453-1-1 modified epoxy resin of Finch, Paint and Chemical Divis ion of ostik CimbH, Obersurselts). The resin affixes itself particularly to polyvinylchloride.
The carbon particles applied consist of the commonly known soot particles of the type ensuring a proper electric conduction.
The soot used is ground and consists in general of a soot obtained when unsaturated compounds are burnt.
The carbon particles consist preferably of soot particles, particularly of soot particles obtained from acetylene.
It is obvious that also tensile stress resistant pipe connections can be established wherein the tensile strength ensuring means may serve as conducting means. For this purpose the means ensuring the tensile strength are provided with a coating comprising aluminum particles.
When a branch connection should be provided, then an electricity conducting connection between the branch pipe and the main pipe should also be established.
Finally it should be noted that when a sleeve joint is formed, if pipe parts with an inner conducting coating are used, then the coating extending on the inner side of the male pipe should be continued at the end of a male pipe on the outer side thereof in order to obtain a conducting connection.
It is evident that instead of aluminum particles also other conductive particles can be incorporated into the coating.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2146641 *Oct 30, 1937Feb 7, 1939Arthur T McwanePipe jointUS3070132 *Apr 6, 1960Dec 25, 1962Sheridan David SNon-sparking medico-surgical tubesUS3152220 *Apr 23, 1962Oct 6, 1964Canada Iron Foundries LtdElectric conducting means for metal pipesUS3249685 *Oct 15, 1963May 3, 1966Amsted Ind IncElectrically conductive pipe jointUS3290426 *Jan 6, 1964Dec 6, 1966Transpolymer Ind IncPlastic pipe having a conductive exterior surface and method of making the sameUS3329764 *May 17, 1965Jul 4, 1967Jr John H TangesConductive plastic cable shieldUS3515396 *Aug 17, 1967Jun 2, 1970Ite Imperial CorpGasket for interfitting conduit sections of an isolated phase bus systemUS3580983 *Dec 3, 1969May 25, 1971Nat Catheter CorpConductive line tubeGB1144357A * Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS4032708 *Mar 1, 1976Jun 28, 1977Jonas MedneyHigh voltage electrical transmission line and conduit therefor and method of making sameUS4103320 *Nov 22, 1976Jul 25, 1978Wavin B. V.Thermally insulated pipe with electrically conducting portions for dissipating static electricityUS4193105 *May 17, 1977Mar 11, 1980Wavin B.V.Pipe with an external sealing bodyUS4633363 *Aug 5, 1985Dec 30, 1986Ameron, Inc.Conductive flanged fittingUS4635162 *Nov 8, 1985Jan 6, 1987Ameron, Inc.Conductive flanges for pipe fittingsUS4709946 *Feb 20, 1987Dec 1, 1987Hunter John JLined pipe jointUS4878600 *Jul 13, 1988Nov 7, 1989Super Sack Manufacturing CorporationStatic controlled discharge spoutUS4985801 *Jun 30, 1988Jan 15, 1991Aerospatiale Societe Nationale IndustrielleTube for the circulation of a flammable fluid, and conduit made from such tubesUS5380432 *May 13, 1993Jan 10, 1995Parr Manufacturing, Inc.Fuel filter with electrostatic charge preventing mediaUS5382359 *May 13, 1993Jan 17, 1995Parr Manufacturing, Inc.Plastic fuel filter with conductive coating for providing an evaporative barrier and for dissipating electrostatic chargesUS5786976 *Jul 16, 1996Jul 28, 1998HydraflowCoupling with hard metallic ductile conductive coatingUS5898559 *Jul 10, 1997Apr 27, 1999Ionix Technologies, Inc.Apparatus and method for neutralizing static electrical charges in gas pipelineUS5951812 *May 23, 1997Sep 14, 1999A. O. Smith CorporationJoining member and method of joining two conductive pieces of fiberglass reinforced plastic pipeUS5973903 *Dec 12, 1997Oct 26, 1999Transdigm, Inc.Fuel line systems with electric charge buildup preventionUS6171492Feb 4, 1999Jan 9, 2001Purolator Products CompanyFilter for liquid fuelUS6442012 *Apr 7, 1999Aug 27, 2002Toyoda Gosei Co., Ltd.Fuel hose resin couplingUS6550500Oct 1, 2001Apr 22, 2003Uponor Innovation AbPlastic pipe having a socket, and a method of providing a plastic pipe with a socketUS7452004 *Dec 26, 2003Nov 18, 2008Sanoh Industrial Co., Ltd.Pipe connecting structureUS9162774Jan 23, 2013Oct 20, 2015The Boeing CompanyFluid transport system for preventing electrical dischargeUS9169029 *Jan 23, 2013Oct 27, 2015The Boeing CompanyConductive coupling assemblyUS9267473Apr 16, 2012Feb 23, 2016Carter Fuel Systems LlcFuel pump assembly with grounded plastic components and fuel tank assembly therewith and method of contruction thereofUS9506587 *Jul 6, 2009Nov 29, 2016Airbus Operations LimitedConnector for an aircraft fuel pipeUS20060099843 *Oct 26, 2005May 11, 2006Fullner Todd CDielectric fittingsUS20070108765 *Dec 26, 2003May 17, 2007Sanoh Indutrial Co., Ltd.Pipe connecting structureUS20080078880 *Aug 7, 2007Apr 3, 2008Airbus Uk LimitedAircraft fuel pipe couplingUS20120056416 *Sep 1, 2011Mar 8, 2012Valerie BriandSystems and methods for establishing electrical continuity about pipes and other conduitsUS20130327888 *Jan 23, 2013Dec 12, 2013The Boeing CompanyConductive Coupling AssemblyCN104235522A *Jun 10, 2014Dec 24, 2014哈米尔顿森德斯特兰德公司Duct with electrically conductive coatingEP2813552A1 *May 23, 2014Dec 17, 2014Hamilton Sundstrand CorporationDuct with electrically conductive coatingWO1987003162A1 *Oct 31, 1986May 21, 1987Ameron, Inc.Conductive flanges for pipe fittingsWO1988003354A1 *Oct 31, 1986May 5, 1988Ameron, Inc.Conductive flanged fittingWO2000060271A1 *Mar 31, 2000Oct 12, 2000Uponor Innovation AbPlastic pipe having a socket, and a method of providing a plastic pipe with a socketWO2012028943A1 *Sep 1, 2011Mar 8, 2012Aerazur S.A.Systems and methods for establishing electrical continuity about pipes and other conduits* Cited by examinerClassifications U.S. Classification174/84.00S, 174/47, 285/55, 285/231, 361/215, 138/137, 252/511International ClassificationF16L11/127, F16L9/12, F16L47/06, E21F1/04, F16L25/01, F16L47/08Cooperative ClassificationF16L25/01, F16L47/08European ClassificationF16L47/08, F16L25/01RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services