Double Jacket Hose: Hoses with double jacket for pressure and vacuum applications
When we talk about double jacket hoses, we refer to a hose made of two distinct layers. The inner layer is known as the core, and the outer layer is referred to as the jacket or outer sleeve. To improve the hose's stability against both overpressure and vacuum, reinforcement with fabric or metallic support spirals between the two layers is possible and common.
With the principle of combining different materials into a composite hose, it is possible to better tailor the double jacket hose to the specific application. For example, a double jacket hose can be manufactured with a chemically resistant inner core and a weather-resistant outer sleeve. The great art here lies in the connection of the two components, as not all materials are compatible. Certain know-how is crucial to achieving the desired result. As a leading provider of technical tubes and hoses, Reichelt offers a wide selection of these specialized pressure hoses, whose application area is broad. The robust suction and pressure hoses can be used, depending on the material, for conveying process solutions, sludges, wastewater, and manure.
The following materials are used in the RCT range as double jacket hose:
- NBR (Acrylonitrile Butadiene Rubber)
- EPDM (Ethylene Propylene Diene Monomer Rubber)
- SBR (Styrene Butadiene Rubber)
- PUR (Polyurethane)
- PA11 (Polyamide11)
In addition, PTFE hoses are available in a double jacket design, with a PTFE tubing and an elastomer outer sleeve, as well as double jacket hoses with glass fabric or metal wire casing.
NBR Double Jacket Hose
NBR, similar to natural rubber, is especially notable for its high flexibility and chemical resistance to fuels and oils. NBR is used to manufacture mineral oil hoses and fuel hoses, including double jacket hoses, which are used in applications where high flexibility and resistance to fuels and oils are crucial.
For use with hot liquids
NBR double jacket hot goods hoses for transporting mineral oil and other liquids up to +180°C are equipped with a chloroprene rubber (CR) outer sleeve and an NBR inner core to achieve optimal abrasion resistance and chemical resistance. To stabilize and increase the pressure resistance (8 bar at +20°C), the NBR double jacket hot goods hose is reinforced with a synthetic fabric insert.
NBR Industrial Hoses, the All-Rounders
Industrial hoses made of NBR also consist of an inner layer of nitrile rubber and an outer layer of CR. To make them more pressure-resistant than the hot goods hoses, the industrial hoses are reinforced with two layers of synthetic fabric. Although they are not intended for use at elevated temperatures, they can withstand continuous temperatures of up to +100°C, temporarily even +120°C. These hoses are the first choice for transporting oils and fuels of all kinds. They are also suitable for permanent outdoor use due to their good weather and ozone resistance. To ensure easy implementation into all systems, RCT offers this model in both metric and inch versions.
Suction and Pressure Hoses
The variant of the NBR-made double jacket pressure or suction hose, which is particularly designed for pressure stability, is characterized by its steel wire insert and the resulting external corrugation. Consequently, these pressure hoses can withstand 10 to 18 bar, depending on the sizing. Additionally, the corrugation allows for easier installation using hose clamps. Suction and pressure hoses for transporting gasoline and oil are equipped with an extra smooth inner core to prevent deposition on the high-pressure hose and minimize pressure loss. Like all NBR hoses, they are ozone and weather resistant. The double jacket suction or pressure hose made of NBR is also suitable for use at temperatures between -20°C and +80°C.
High-Pressure Products from NBR
In high-pressure processes, pressures of up to 400 bar can occur. For such applications, double jacket equipment must be reinforced with inserts for high-pressure use. For moderate pressures of up to 145 bar, chemical lines with textile inserts are used, and for extreme applications of up to 400 bar, chemical conduits with steel braid inserts. To meet these requirements, both variants are certified according to DIN EN 854 and DIN 20021. Like the other models made of NBR, they exhibit high flexibility and excellent resistance to mineral oils, fuels, and weather influences. Temperatures from -40°C to +100°C, temporarily even +125°C, are easily withstood by these specialty products.
EPDM Double Jacket Hose
Compared to NBR, EPDM has the advantage of remaining flexible at very low temperatures and not becoming brittle. Therefore, double jacket variants made of EPDM are more likely to be used where negative temperatures can occur or are even required.
High-Pressure Applications from EPDM
For high-pressure use in temperature ranges between -40°C and +155°C, EPDM tubing in high-pressure-resistant double jacket design is suitable. These components are equipped with one or two steel wire braids, which lie between the inner core made of EPDM and the outer sleeve made of CR. The robust structure enables possible operating pressures of 215 bar (single-layer wire braid) or 350 bar (double-layer wire braid). The common liquids transported include hot water, glycol-based operating fluids, many acids and alkalis, and polar solvents.
Beverage Hoses from EPDM
Due to its physiological harmlessness and low-temperature flexibility, EPDM is often used in the food processing industry. Higher temperatures would damage the transported goods (e.g., fruit juices, mineral water, wine, must, etc.), which is why active cooling is often necessary. Usage as beverage hose between -35°C and +95°C is recommended. The smooth EPDM inner core ensures a very even flow of liquid and trouble-free temperature distribution. The food-grade quality is certified by FDA and BfR Category III certification. However, use with fatty liquids such as milk is not recommended.
EPDM Brake Systems
EPDM-based double jacket components are also excellent for use as compressed air and brake lines. Since they retain their flexibility and air and pressure tightness at all temperatures, EPDM products are ideally suited for this application. With a temperature range of -40°C to +70°C, almost all climatic fluctuations occurring in nature are covered. A maximum operating pressure of 10 bar (at +20°C) is achieved, among other things, by an insert made of PVAA. Important for brake system use is the certification according to DIN 74310. This provides the safety-relevant framework data for components to be installed in compressed air brake systems. Naturally, this special product available at RCT meets these requirements.
SBR Double Jacket Hoses
Double jacket hoses made of SBR have similar properties to those made of EPDM. They perform well at low temperatures, where they maintain their flexibility. Equipped with an inner core made of SBR, an outer sleeve made of an SBR/EPDM compound, and a synthetic fabric insert, these hose types are primarily used as process water hoses. Due to the smooth outer sleeve and the used material mix, the described hose achieves very good abrasion resistance. With a stable operating range between -40°C to +70°C and a maximum operating pressure of 12 bar, the transport of cold or moderately warm process waters is the predestined application area for this chemical hose.
PUR Double Jacket Hoses
Double jacket hoses with an inner core made of PUR are coated with low-density polyethylene (LDPE). As a high-pressure hose, this combination is found in the Reichelt Chemietechnik range. Against fluids based on mineral oil and glycol, mineral lubricants, coolants, paints, various solvents, fuels, carbon dioxide, compressed air, refrigerants, nitrogen, and natural gas, PUR shows stability. However, this hose variant should not be used with hot water (over +70°C). High gas tightness, weather resistance, and a remarkable resistance to wear characterize these specialty hoses as well as their pressure stability up to 207 bar. For special applications with two transport streams, the twin hose variant is offered. Here, two hoses are permanently connected to each other by hot extrusion.
PA11 Pressure Hoses
PA11, as a thermoplastic plastic, is a rather rigid material. Thus, its strengths lie in kink and impact resistance. Moreover, it is resistant to a large number of different chemicals. Thus, fluids based on mineral oil and glycol, mineral lubricants, coolants, water up to +70°C, paints, various solvents, fuel, carbon dioxide, compressed air, nitrogen, and natural gas can be easily transported through PA11 hoses. Polyamide hoses are used in the RCT range as double jacket high-pressure chemical hoses. While the inner core made of PA11 guides the transported material, the outer sleeve made of polyurethane insulates the hose from the outside. With a maximum operating pressure of 207 bar (depending on the hose dimension) and a permissible temperature range of -40 to +100°C, this product provides a versatile solution for many applications.
Buy double jacket hoses at rct-online.de
In the range of Reichelt Chemietechnik, you will find not only the right double jacket hose as cut-to-size or by the meter but also suitable accessories, such as barb connectors, valves, taps, hose clamps, and other connection elements.
Double jacket hoses for use in your application as well as other tailor-made products can be conveniently ordered in our online shop – without a minimum quantity. Benefit from high-quality and short-term available products at favorable conditions. If you are unsure about the selection or have questions, just contact us, either by phone or email. Further chemical-technical information on the offered materials can be found in our glossary. Using our resistance list, it is easy to determine the ideal material.
Close window
Double Jacket Hose: Hoses with double jacket for pressure and vacuum applications
When we talk about double jacket hoses, we refer to a hose made of two distinct layers. The inner layer is known as the core, and the outer layer is referred to as the jacket or outer sleeve. To improve the hose's stability against both overpressure and vacuum, reinforcement with fabric or metallic support spirals between the two layers is possible and common.
With the principle of combining different materials into a composite hose, it is possible to better tailor the double jacket hose to the specific application. For example, a double jacket hose can be manufactured with a chemically resistant inner core and a weather-resistant outer sleeve. The great art here lies in the connection of the two components, as not all materials are compatible. Certain know-how is crucial to achieving the desired result. As a leading provider of technical tubes and hoses, Reichelt offers a wide selection of these specialized pressure hoses, whose application area is broad. The robust suction and pressure hoses can be used, depending on the material, for conveying process solutions, sludges, wastewater, and manure.
The following materials are used in the RCT range as double jacket hose:
- NBR (Acrylonitrile Butadiene Rubber)
- EPDM (Ethylene Propylene Diene Monomer Rubber)
- SBR (Styrene Butadiene Rubber)
- PUR (Polyurethane)
- PA11 (Polyamide11)
In addition, PTFE hoses are available in a double jacket design, with a PTFE tubing and an elastomer outer sleeve, as well as double jacket hoses with glass fabric or metal wire casing.
NBR Double Jacket Hose
NBR, similar to natural rubber, is especially notable for its high flexibility and chemical resistance to fuels and oils. NBR is used to manufacture mineral oil hoses and fuel hoses, including double jacket hoses, which are used in applications where high flexibility and resistance to fuels and oils are crucial.
For use with hot liquids
NBR double jacket hot goods hoses for transporting mineral oil and other liquids up to +180°C are equipped with a chloroprene rubber (CR) outer sleeve and an NBR inner core to achieve optimal abrasion resistance and chemical resistance. To stabilize and increase the pressure resistance (8 bar at +20°C), the NBR double jacket hot goods hose is reinforced with a synthetic fabric insert.
NBR Industrial Hoses, the All-Rounders
Industrial hoses made of NBR also consist of an inner layer of nitrile rubber and an outer layer of CR. To make them more pressure-resistant than the hot goods hoses, the industrial hoses are reinforced with two layers of synthetic fabric. Although they are not intended for use at elevated temperatures, they can withstand continuous temperatures of up to +100°C, temporarily even +120°C. These hoses are the first choice for transporting oils and fuels of all kinds. They are also suitable for permanent outdoor use due to their good weather and ozone resistance. To ensure easy implementation into all systems, RCT offers this model in both metric and inch versions.
Suction and Pressure Hoses
The variant of the NBR-made double jacket pressure or suction hose, which is particularly designed for pressure stability, is characterized by its steel wire insert and the resulting external corrugation. Consequently, these pressure hoses can withstand 10 to 18 bar, depending on the sizing. Additionally, the corrugation allows for easier installation using hose clamps. Suction and pressure hoses for transporting gasoline and oil are equipped with an extra smooth inner core to prevent deposition on the high-pressure hose and minimize pressure loss. Like all NBR hoses, they are ozone and weather resistant. The double jacket suction or pressure hose made of NBR is also suitable for use at temperatures between -20°C and +80°C.
High-Pressure Products from NBR
In high-pressure processes, pressures of up to 400 bar can occur. For such applications, double jacket equipment must be reinforced with inserts for high-pressure use. For moderate pressures of up to 145 bar, chemical lines with textile inserts are used, and for extreme applications of up to 400 bar, chemical conduits with steel braid inserts. To meet these requirements, both variants are certified according to DIN EN 854 and DIN 20021. Like the other models made of NBR, they exhibit high flexibility and excellent resistance to mineral oils, fuels, and weather influences. Temperatures from -40°C to +100°C, temporarily even +125°C, are easily withstood by these specialty products.
EPDM Double Jacket Hose
Compared to NBR, EPDM has the advantage of remaining flexible at very low temperatures and not becoming brittle. Therefore, double jacket variants made of EPDM are more likely to be used where negative temperatures can occur or are even required.
High-Pressure Applications from EPDM
For high-pressure use in temperature ranges between -40°C and +155°C, EPDM tubing in high-pressure-resistant double jacket design is suitable. These components are equipped with one or two steel wire braids, which lie between the inner core made of EPDM and the outer sleeve made of CR. The robust structure enables possible operating pressures of 215 bar (single-layer wire braid) or 350 bar (double-layer wire braid). The common liquids transported include hot water, glycol-based operating fluids, many acids and alkalis, and polar solvents.
Beverage Hoses from EPDM
Due to its physiological harmlessness and low-temperature flexibility, EPDM is often used in the food processing industry. Higher temperatures would damage the transported goods (e.g., fruit juices, mineral water, wine, must, etc.), which is why active cooling is often necessary. Usage as beverage hose between -35°C and +95°C is recommended. The smooth EPDM inner core ensures a very even flow of liquid and trouble-free temperature distribution. The food-grade quality is certified by FDA and BfR Category III certification. However, use with fatty liquids such as milk is not recommended.
EPDM Brake Systems
EPDM-based double jacket components are also excellent for use as compressed air and brake lines. Since they retain their flexibility and air and pressure tightness at all temperatures, EPDM products are ideally suited for this application. With a temperature range of -40°C to +70°C, almost all climatic fluctuations occurring in nature are covered. A maximum operating pressure of 10 bar (at +20°C) is achieved, among other things, by an insert made of PVAA. Important for brake system use is the certification according to DIN 74310. This provides the safety-relevant framework data for components to be installed in compressed air brake systems. Naturally, this special product available at RCT meets these requirements.
SBR Double Jacket Hoses
Double jacket hoses made of SBR have similar properties to those made of EPDM. They perform well at low temperatures, where they maintain their flexibility. Equipped with an inner core made of SBR, an outer sleeve made of an SBR/EPDM compound, and a synthetic fabric insert, these hose types are primarily used as process water hoses. Due to the smooth outer sleeve and the used material mix, the described hose achieves very good abrasion resistance. With a stable operating range between -40°C to +70°C and a maximum operating pressure of 12 bar, the transport of cold or moderately warm process waters is the predestined application area for this chemical hose.
PUR Double Jacket Hoses
Double jacket hoses with an inner core made of PUR are coated with low-density polyethylene (LDPE). As a high-pressure hose, this combination is found in the Reichelt Chemietechnik range. Against fluids based on mineral oil and glycol, mineral lubricants, coolants, paints, various solvents, fuels, carbon dioxide, compressed air, refrigerants, nitrogen, and natural gas, PUR shows stability. However, this hose variant should not be used with hot water (over +70°C). High gas tightness, weather resistance, and a remarkable resistance to wear characterize these specialty hoses as well as their pressure stability up to 207 bar. For special applications with two transport streams, the twin hose variant is offered. Here, two hoses are permanently connected to each other by hot extrusion.
PA11 Pressure Hoses
PA11, as a thermoplastic plastic, is a rather rigid material. Thus, its strengths lie in kink and impact resistance. Moreover, it is resistant to a large number of different chemicals. Thus, fluids based on mineral oil and glycol, mineral lubricants, coolants, water up to +70°C, paints, various solvents, fuel, carbon dioxide, compressed air, nitrogen, and natural gas can be easily transported through PA11 hoses. Polyamide hoses are used in the RCT range as double jacket high-pressure chemical hoses. While the inner core made of PA11 guides the transported material, the outer sleeve made of polyurethane insulates the hose from the outside. With a maximum operating pressure of 207 bar (depending on the hose dimension) and a permissible temperature range of -40 to +100°C, this product provides a versatile solution for many applications.
Buy double jacket hoses at rct-online.de
In the range of Reichelt Chemietechnik, you will find not only the right double jacket hose as cut-to-size or by the meter but also suitable accessories, such as barb connectors, valves, taps, hose clamps, and other connection elements.
Double jacket hoses for use in your application as well as other tailor-made products can be conveniently ordered in our online shop – without a minimum quantity. Benefit from high-quality and short-term available products at favorable conditions. If you are unsure about the selection or have questions, just contact us, either by phone or email. Further chemical-technical information on the offered materials can be found in our glossary. Using our resistance list, it is easy to determine the ideal material.
