SE539206C2 - A method for feeding a fluid and a flexible hose, primarily intended for transporting fluid/urea in a vehicle in cold weather - Google Patents

A method for feeding a fluid and a flexible hose, primarily intended for transporting fluid/urea in a vehicle in cold weather Download PDF

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Publication number
SE539206C2
SE539206C2 SE1451557A SE1451557A SE539206C2 SE 539206 C2 SE539206 C2 SE 539206C2 SE 1451557 A SE1451557 A SE 1451557A SE 1451557 A SE1451557 A SE 1451557A SE 539206 C2 SE539206 C2 SE 539206C2
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SE
Sweden
Prior art keywords
hose
fluid
urea
vehicle
ice
Prior art date
Application number
SE1451557A
Other languages
Swedish (sv)
Other versions
SE1451557A1 (en
Inventor
Köhler Andreas
Original Assignee
Scania Cv Ab
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 Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1451557A priority Critical patent/SE539206C2/en
Priority to DE102015015208.4A priority patent/DE102015015208A1/en
Publication of SE1451557A1 publication Critical patent/SE1451557A1/en
Publication of SE539206C2 publication Critical patent/SE539206C2/en

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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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/20—Double-walled hoses, i.e. two concentric hoses
    • 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
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/10—Hoses, i.e. flexible pipes made of rubber or flexible plastics with reinforcements not embedded in the wall
    • 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
    • F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30—Heating of pipes or pipe systems
    • 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
    • F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30—Heating of pipes or pipe systems
    • F16L53/32—Heating of pipes or pipe systems using hot fluids
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/09—Component parts or accessories
    • E03B7/14—Devices for thawing frozen pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

A METHOD FOR FEEDING A FLUID AND A FLEXIBLE HOSE, PRIMARILY INTENDED FOR TRANSPORTING FLUID/UREA IN A VEHICLE IN COLD WEATHER TECHNICAL FIELD The present invention relates to a hose system in a vehicle for feeding a fluid, e.g. a solution comprising urea from a tank to an exhaust-gas treatment device. The hose system is intended to solve the problem with fluid freezing in the hose system when the vehicle/engine is not used for a certain period of time and in a simple, fast and cost effective manner melting frozen fluid thereby making it possible to start the exhaust-gas treatment system and the vehicle in cold weather, without a substantial time delay. The invention is particularly intended for heavy commercial vehicles such as trucks and buses but can of course be used in other vehicles or in other applications. The invention also relates to a vehicle provided with a hose system according to the invention.
BACKGROUND ART In order to comply with the ever more restrictive standards to limit air-pollution by exhaust gases produced by motor vehicles, a SCR circuit (a Selective Catalytic Reduction system) has to be used in relation to the exhaust systems of motor vehicles, in particular in heavy commercial vehicles such as trucks and buses.
The SCR system injects an aqueous solution by e.g. compressed air at the inlet of the catalyzer in the vehicle, located at the silencer of the exhaust gases. Ammonia is generally used as reducing agent and a widely used solution is a urea-water solution containing e.g. 32.5% urea, available under the trade AdBlue<®>. In the vehicle catalyzer the urea reacts with the nitrogen oxides in the exhaust gases, eliminating these oxides from reaching the atmosphere.
To carry out this process, the solution containing urea is available in a tank installed in the vehicle, from which the urea solution is pumped and injected into the catalyzer, after having been mixed with e.g. compressed air, in order to reduce the nitrogen oxide compounds in the exhaust gases.
However a reducing agent will freeze at low temperatures. The reducing agent AdBlue<®>, for example, will freeze at temperatures of -11 °C and below. Such temperatures may occur for example during long standstill phases of a vehicle.
An aqueous reducing agent expands when freezing. A delivery device must therefore be designed in such a manner that it is not damaged by the expansion of the freezing reducing agent or by the associated pressure increase.
PROBLEM In cold weather below -11 C° and when having the vehicle stopped/parked the urea solution eventually will freeze in the hoses of the urea system. In order to start up a frozen system comprising a urea solution, and this is desirable before the vehicle engine is started, all hoses in the system must be heated/warmed so that the frozen urea solution will melt permitting urea to flow unhindered through the system. This will, in known urea systems, take some time and will normally use considerable electric energy provided from the vehicles battery.
Known systems to solve these problems are often complex and contains a number of components, as well as electrical circuits/components, which makes them expensive to manufacture and install and they will also consume electric energy when used. To melt the ice in the hoses the vehicle engine has to be started, which will result in higher fuel consumption.
In the international patent application WO2012/038925 (Dytech-Dynamic Fluid Technologies S.P.A.) is described a piping for a SCR circuit intended for a motor vehicle and for feeding a solution comprising urea. The piping comprises an electrical resistor surrounding an inner pipe for heating the solution therein containing urea. In this system the outer pipe/hose is flexible and the inner pipe/hose is stiff and the electrical resistor uses electric current from the vehicles battery/- alternator system for heating the fluid inside the pipe/hose.
In the international patent document W02009/095941 (Dayco Fluid Technologies S.P.A.) is described a multilayer hose/pipe for conveying an aqueous solution containing urea. The invention comprises a heating element and an insulating layer. The heating element is a tubular braid or net element wrapped around the inner conveying pipe, and in which net at least one wire is formed by a conductive material, such as a resistor. The heating require that electrical energy is fed to the system. The pipe is made of hydrolysis-resistant thermoplastic material.
In the patent application document US2009/0255232 (Barcin) is described a method and device for treating exhaust gases of an internal combustion engine with a reducing agent injected into the exhaust gases. The reducing agent can circulate between a delivery device and a reactant reservoir particularly when the dosing valve is closed, preventing the reactant from freezing.
Other solutions to the problem of frozen fluid/urea in pipes exist in the market but none of these prior known systems describes a method or a hose system that offers a simple, cost effective and an immediate start up possibility for a frozen fluid/urea system according to the present invention.
The present invention provides a cost effective, light, robust and easy to install solution. No electrical cables have to be installed and no electrical current have to be used.
Other solutions to this problem exist in the market but none of these prior known systems illustrates a hose system that offers a fast method for heating and melting the frozen urea/ice.
SUMMARY OF THE INVENTION One object of the present invention is to solve the above mentioned problems and to provide a simple hose system for rapidly melting frozen urea/ice and making it possible to start the system/vehicle without a considerable time delay.
Another object of the invention is to design a hose system that does not need installation of heavy or space consuming components.
Another object of the invention is to design a hose system that does not consume electric energy.
Another object of the invention is to design a hose system containing as few components as possible.
A further object of the invention is that installation of the hose system should be easy and not require extensive new/different installation procedures.
These and further objects and advantages is achieved by the invention by a method and a hose system designed in accordance with the features recited in claim 1.
The invention is achieved by means of using an inner flexible hose, for transporting a fluid, located inside or inserted into an outer substantially inflexible hose where the outer inflexible hose is at least partly perforated allowing air to pass into or out from the volume formed between the inner and outer hoses. The inner hose is arranged to expand when exposed to an internal pressure, such as from an increasing fluid pressure, thereby allowing warm or at least thawed, fluid/urea to flow through the hose between the present frozen urea or ice and the inner wall of the flexible hose thereby melting the remaining frozen fluid/urea inside the hose system. The flexible inner hose allow fluid/urea to flow in the system as soon as the fluid is supplied under pressure to the hose system as it may flow radially outside the frozen core, expanding the diameter of the inner hose. The outer inflexible hose will protect the inner flexible hose from surrounding components but also to limit the expansion of the inner hose preventing it from disrupting.
The first inner hose may be made of EPDM, FKM or HNBR and the second outer hose may be made of PA. The outer hose may also be made of EPDM, e.g. provided with reinforcement that makes it handle pressures of up to, or more than, 20 bar. Advantages of the invention/solution are that the exhaust-gas treatment system will start up more or less immediately and that no electric energy/heating is needed for melting frozen fluid/urea in the hoses. The vehicle will also be more fuel efficient, consuming less fuel.
Further features and advantages of the invention will be apparent from the following, more detailed description of the invention and the accompanying drawings and the claims.
BRIEF DESCRIPTION OF THE DRAWINGS The invention is described below in some preferred embodiments illustrated in the accompanying drawings.Figure lais a perspective view of an activated, pressurized, hose system according to the invention.Figure lbillustrates a detailed sectional view, from the side, of the hose system illustrated in figure la.Figure 2ais a perspective view of an inactive, depressurized, hose system where the fluid, the urea, has frozen to ice.Figure 2billustrates a detailed sectional side view of the inactive, depressurized, hose system, here with frozen urea in the center of the hose system.Figure 3aillustrates a detailed sectional side view of the hose system but now activated and pressurized by warm fluid, still with ice in the middle of the inner hose.Figure 3billustrates a detailed sectional side view of the hose system in a somewhat later stage where most of the ice has melted.Figure 4illustrates a detailed sectional side view of the hose system in a fully activated stage where all ice has melted.
DESCRIPTION OF PREFERRED EMBODIMENTS The present invention relates to a hose system intended for feeding a fluid, especially a solution comprising urea, from a reservoir/tank to an exhaust-gas treatment device connected to the vehicles exhaust system. The invention permits fluid/urea to be transported in the hose system immediately when activated thereby melting the frozen fluid and making it possible to operate the exhaust-gas treatment system, and start the vehicle, in cold weather without substantial time delays.
Figure lais a perspective view of an activated, pressurized, hose system 1 according to the invention. A first, inner, hose 2 of a flexible material is inserted into a substantially inflexible second, outer, hose 3. Inside the inner hose 2 a fluid 4 is transported, for example from a tank (not shown) warmed by the cooling fluid from a vehicle engine(not shown), to for example a device (not shown) arranged in the vehicle for delivering reducing agent, like urea, into an exhaust-gas treatment device (not shown). The pressure of the fluid 4 expands the flexible inner hose 2 in a radial direction against the inside of the outer substantially inflexible hose 3. The outer inflexible hose 3 is at least partly perforated by small holes 5 in such a way that air could pass into or out from the volume 6 formed between the inner hose 2 and outer hose 3.
Figure lbillustrates a detailed sectioned view, from the side, of the hose system 1 illustrated in figure la. The fluid 4, for instance urea, flows inside the inner flexible hose 2 from e.g. a tank (not shown) to e.g. an exhaust-gas treatment device (not shown). Due to the pressure of the fluid the inner hose 2 expands in a radial direction against the inside of the substantially inflexible outer hose 3. The air in the volume 6 between the inner and outer hoses 2,3 is passing out through the holes 5 of the outer hose 3.
Figure 2ais a perspective view of an inactive, depressurized, hose system 1 where the fluid 4, the urea in the hose system 1, has frozen to ice. The outer hose 3 substantially maintains its normal shape, it does not change its diameter in any significant way, while the inner flexible hose 2 shrinks in such a way that its diameter is decreased, still holding a certain volume of fluid 4 in its inner volume. When a vehicle is parked in cold weather it does not take long for the urea fluid 4 to freeze in the hoses 2,3. The urea present in the tank/reservoir will not freeze for a long time as the tank/reservoir has been warmed by the engine cooling system and also keeps a large volume of fluid, urea.Figure 2billustrates a detailed sectioned side view of the inactive, depressurized, hose system 1, here with frozen fluid/urea 4 in the center of the hose system 1. Air has been sucked in via the holes 5 arranged in the outer hose 3. In a first stage fluid/urea, is partly squeezed out of the inner hose 2 back to the reservoir/tank and/or to the exhaust-gas treatment device when it shrinks to a smaller diameter. At a second stage, when the vehicle has been standing still for a while, in cold weather, the fluid/urea 4 will begin to freeze in the hose system 1. This may result in that the diameter of the inner hose 2 will increase in some degree due to the expansion of the fluid/urea 4 to ice. The dimensions of the hoses 2,3 are so arranged that there will still be a certain volume 6 of air between left between the inner hose 2 and the outer hose 3.
As an example of dimensions of the hoses 2,3 the diameter of the inner hose 2 may be for instance 5 mm at a low pressure, such as a pressure of 1 bar and its diameter may expand to for instance 6 mm at a higher fluid pressure, for instance at 9 bar, as may be the case when freezing. This gives enough space between the inside of the inner hose 2 and the fluid/urea 4 ice for permitting warm urea to flow and melt the frozen urea of the inner hose 2. The outer hose 3 is substantially rigid having an inner diameter of for example 12 mm and will withstand the pressure from the inner hose 2, and will substantially keep its dimensions, which may occur during normal use, for example at 20 bar.
Figure 3aillustrates a detailed sectioned side view of the hose system 1 but again activated after a standstill of the vehicle and an inactivated urea system. Warm fluid under pressure, pressurized by e.g. a pump (not shown) or similar, will be forced into the inner hose 2 between the frozen fluid/urea 4a and the inside wall of the inner hose 2. The inner hose 2 will expand, eventually until the inner hose 2 is pressed against the inner side of the outer hose 3. This means that fluid/urea 4, generally warmed in a tank by for instance the cooling fluid of the engine, will flow into the volume between the frozen fluid/urea 4a and the wall of the inner hose 2. In this way the urea system will be activated more or less immediately and will also rapidly melt the remaining frozen fluid/urea 4a in the inner hose 2.Figure 3billustrates a detailed sectional side view of the hose system 1 in a somewhat later stage where most of the frozen fluid/urea 4a has melted. The figure illustrates how a small center part of the frozen fluid/urea 4a still remains.Figure 4illustrates a detailed sectional side view of the hose system 1 in a fully activated stage where all fluid/urea ice 4a has melted and no frozen urea remains in the hose system 1.
The above description is primarily intended to facilitate the understanding of the invention. However the invention is of course not in any way restricted to only the disclosed embodiments, but many possibilities to modifications would be apparent to a person skilled in the art within the scope of the invention without departing from the basic idea of the invention as defined in the appended claims.

Claims (8)

1. Hose system (1) for feeding a fluid (4), for example from a tank holding urea to an exhaust-gas treatment device, and primarily intended for heavy commercial vehicles such as trucks and buses and for use in areas with cold weather, comprising at least a first and a second hose (2,3), characterized in that - the first hose (2) is arranged inside the second hose (3) , - the first hose (2) is made of a flexible material permitting it to expand radially outwards, and - that the first hose (2) is arranged to allow fluid/urea (4) under pressure to flow outside a frozen core of fluid/urea ice (4a), present in the inner volume of the first hose (2), thereby expanding the first hose (2) in a direction against the inside of the second hose (3) creating a passage around the frozen core of fluid/urea ice (4a).
2. Hose system (1) according to claim 1, characterized in that the second hose (3) is made of a substantially inflexible material and arranged to substantially keep its diameter when exposed to pressure from inside.
3. Hose system (1) according to claim 1 or 2, characterized in that the second hose (3) is arranged with perforations or holes (5) through its wall, allowing air to pass through.
4. Hose system (1) according to any preceding claims, characterized in that the first hose (2) is made of a material allowing it to expand its diameter by up to 20%.
5. Hose system (1) according to any preceding claims, characterized in that the first hose (2) is made of at least one of the materials EPDM, FKM or HNBR.
6. Hose system (1) according to any preceding claims, characterized in that the second hose (3) is made of at least one of the materials EPDM or PA.
7. Method for feeding a fluid, for example from a tank holding urea to an exhaust-gas treatment device, in cold weather, primarily intended for heavy commercial vehicles such as trucks and buses and comprising at least a first and a second hose (2,3), characterized in the following method steps, - inserting the first hose (2) into the second hose (3), - allowing the first hose (2) to expand radially outwards when pressurized, - substantially keeping the diameter of the second hose (3) when exposed to pressure from inside, and - allowing fluid (4) under pressure to flow outside a frozen core of fluid/urea ice (4a) present in the inner volume of the first hose (2), thereby expanding the first hose (2) in a direction against the inside of the second hose (3) creating a passage around the frozen core of fluid/urea ice (4a).
8. Vehicle provided with a hose system (1) according to any of the claims 1-6.
SE1451557A 2014-12-16 2014-12-16 A method for feeding a fluid and a flexible hose, primarily intended for transporting fluid/urea in a vehicle in cold weather SE539206C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE1451557A SE539206C2 (en) 2014-12-16 2014-12-16 A method for feeding a fluid and a flexible hose, primarily intended for transporting fluid/urea in a vehicle in cold weather
DE102015015208.4A DE102015015208A1 (en) 2014-12-16 2015-11-24 A flexible hose intended primarily for transporting a liquid / urea in a vehicle in cold weather

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1451557A SE539206C2 (en) 2014-12-16 2014-12-16 A method for feeding a fluid and a flexible hose, primarily intended for transporting fluid/urea in a vehicle in cold weather

Publications (2)

Publication Number Publication Date
SE1451557A1 SE1451557A1 (en) 2016-06-17
SE539206C2 true SE539206C2 (en) 2017-05-09

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SE1451557A SE539206C2 (en) 2014-12-16 2014-12-16 A method for feeding a fluid and a flexible hose, primarily intended for transporting fluid/urea in a vehicle in cold weather

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SE (1) SE539206C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107859803B (en) * 2017-11-14 2019-08-13 胜利油田兴达高祥新材料有限责任公司 It is a kind of can heating and thermal insulation petroleum transportation pipe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005002318A1 (en) 2005-01-17 2006-07-27 Robert Bosch Gmbh Exhaust gas aftertreatment process and device for this purpose
US20110262310A1 (en) 2008-01-30 2011-10-27 Dytech - Dynamic Fluid Technologies S.P.A. Multilayer hose for conveying an aqueous solution containing urea
ITTO20100773A1 (en) 2010-09-22 2012-03-23 Dytech Dynamic Fluid Tech Spa PIPE FOR A SCR CIRCUIT OF A VEHICLE

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DE102015015208A1 (en) 2016-06-16
SE1451557A1 (en) 2016-06-17

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