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Double-tube heat exchanger
Type VEV-DR / VEV-L-DR
Safety first - The safety heat exchanger from GTS!
Double-pipe heat exchangers—also known as double-pipe heat transfer units—have established themselves as a standard in the chemical industry, the energy sector, heavy and light industry, the oil and gas, marine, transportation, and refrigeration sectors, as well as in the food and beverage industry, where they are highly valued. As a manufacturer of double-pipe heat exchangers and safety heat exchangers, we offer innovative solutions with every safety heat exchanger for heat exchange between a medium that is harmful to the environment and a medium that is released back into the environment, or between two media that react with each other.
This results in the typical applications for industrial double-pipe heat exchangers, such as in the oil cooling of turbines, gearboxes, and compressors; in process water heating; in the wood industry; and in the chemical and petrochemical industries, where mixing must be strictly avoided for process reasons. Stainless steel double-pipe heat exchangers, in particular, are also suitable for demanding environments with high requirements for corrosion resistance.
This results in the typical applications for industrial double-pipe heat exchangers, such as in the oil cooling of turbines, gearboxes, and compressors; in process water heating; in the wood industry; and in the chemical and petrochemical industries, where mixing must be strictly avoided for process reasons. Stainless steel double-pipe heat exchangers, in particular, are also suitable for demanding environments with high requirements for corrosion resistance.
We are constantly working to optimize the efficiency and safety of media-separated heat exchangers in order to meet the industry’s growing demands. In an era of stricter laws and regulations regarding safety requirements for environmental and water protection, our safety double-pipe heat exchangers are the technology of choice.
E-1000 Thielmann Energietechnik GmbH
Double-Pipe Heat Exchangers at a Glance
- Industries: Chemicals, energy, heavy and light industry, oil & gas, marine, transportation, refrigeration, food industry
- Areas of application: Environmentally friendly heat exchange, reactive media, oil cooling (turbines, gearboxes), process water, wood industry, petrochemicals
- Advantages: Meet strict environmental requirements, prevent mixing, legally compliant
Double-Pipe Heat Exchangers: General Information
Double-pipe heat exchangers are used in industries where the highest safety requirements for heat exchange must be met. A media-separated heat exchanger meets precisely this requirement.
How Our Double-Pipe Heat Exchangers Work
Double-pipe heat exchangers provide safe heat exchange for media that are hazardous to the environment and human health, thanks to their double-pipe system, the monitored safety chamber, and the double pipe wall. They comply with strict legal regulations, reduce the risk of leaks, and protect both the environment and plant personnel.
The integrated leak monitoring system enables a rapid response to leaks, thereby preventing operational interruptions and production downtime, with a differential pressure gauge capable of measuring the pressure differential for condition monitoring. Such a heat exchanger with leak monitoring is designed as a double-walled heat exchanger in which the safety space between the two tube walls is continuously monitored. Thanks to low pressure drop and efficient heat transfer, they remain highly efficient and cost-effective.
Information on shell-and-tube heat exchangers can be found here.
The integrated leak monitoring system enables a rapid response to leaks, thereby preventing operational interruptions and production downtime, with a differential pressure gauge capable of measuring the pressure differential for condition monitoring. Such a heat exchanger with leak monitoring is designed as a double-walled heat exchanger in which the safety space between the two tube walls is continuously monitored. Thanks to low pressure drop and efficient heat transfer, they remain highly efficient and cost-effective.
Information on shell-and-tube heat exchangers can be found here.
E-1000 Thielmann Energietechnik GmbH
Installation reasons for GTS safety double-tube heat exchangers with leakage monitoring
The key reasons for installation usually stem from the following requirements:
- Compliance with legal requirements, which are becoming increasingly stringent
- Safe transport of environmentally hazardous substances via the double-pipe system
- Safety considerations to reduce risks and limit liability
- Reduction of insurance risks; protection against liability risks
- Environmental issues are becoming increasingly important
- Moral and ethical concerns regarding leaks during the transfer of hazardous chemicals or media
- Protection of people (staff in buildings); the plant operator is responsible for staff safety
- Ability to control leaks while protecting the surrounding environment; early leak detection to prevent damage through appropriate leak monitoring systems
- Prevention of operational disruptions—protection of sensitive and expensive production equipment. Production downtime can be very costly!
- Low pressure drop with maximum heat transfer
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Double-pipe heat exchanger for gaseous and liquid media
In numerous industrial processes, reliable and efficient heat exchange between two fluid media is a key prerequisite for stable operating conditions and economical process control. THIELMANN ENERGIETECHNIK GmbH develops and manufactures specially adapted double-tube heat exchangers for gas, which are characterized by a compact design, high heat transfer performance and robust construction - ideally suited for demanding applications with gaseous and liquid media.
Our double-tube heat exchangers for industrial applications are used in a wide range of industries, including chemicals, petrochemicals, polymer plants, natural gas extraction, the food industry, shipbuilding and other maritime and industrial applications. Our individually designed heat exchangers prove their strengths particularly in special applications where standard solutions reach their limits.
Thanks to their sophisticated design, our systems enable efficient heat exchange for a wide range of fluid media such as:
Depending on the application, we implement the desired thermodynamic functions - be it heating, superheating or cooling - with the utmost precision. We attach great importance to the selection of media-compatible materials, pressure- and temperature-resistant design and maintenance-friendly design.
Our many years of experience in the design of double-tube heat exchangers guarantee optimum adaptation to your process-specific requirements - regardless of whether aggressive, flammable or high-purity media are involved. Double-tube heat exchangers are used in particular when high operational reliability and media-separated heat flows are required.
At THIELMANN ENERGIETECHNIK GmbH, we understand the physical and operational challenges of your industry and offer you tailor-made solutions that you can rely on - "Engineered in Germany".
Our double-tube heat exchangers for industrial applications are used in a wide range of industries, including chemicals, petrochemicals, polymer plants, natural gas extraction, the food industry, shipbuilding and other maritime and industrial applications. Our individually designed heat exchangers prove their strengths particularly in special applications where standard solutions reach their limits.
Thanks to their sophisticated design, our systems enable efficient heat exchange for a wide range of fluid media such as:
- Natural gas, biogas and LNG gas
- Hydrogen and other process gases
- Nitrogen, air and other technical gases
- Water, glycol and glycol mixtures
Depending on the application, we implement the desired thermodynamic functions - be it heating, superheating or cooling - with the utmost precision. We attach great importance to the selection of media-compatible materials, pressure- and temperature-resistant design and maintenance-friendly design.
Our many years of experience in the design of double-tube heat exchangers guarantee optimum adaptation to your process-specific requirements - regardless of whether aggressive, flammable or high-purity media are involved. Double-tube heat exchangers are used in particular when high operational reliability and media-separated heat flows are required.
At THIELMANN ENERGIETECHNIK GmbH, we understand the physical and operational challenges of your industry and offer you tailor-made solutions that you can rely on - "Engineered in Germany".
Applications of Double-Pipe Heat Exchangers by Industry
1. Chemical and Petrochemical Industry
2. Oil and Gas Industry
3. Energy and Power Plant Technology
4. Food and Beverage Processing
5. Shipbuilding and maritime applications
6. Metal and Steel Processing
- Reactor Temperature Control: Shell-and-tube heat exchangers —also available as double-walled shell-and-tube heat exchangers upon request—ensure stable temperature control in chemical reactors, thereby guaranteeing consistent reaction conditions.
- Energy Efficiency Through Heat Recovery: Process waste heat is often utilized via a counterflow shell-and-tube heat exchanger to thermally pre-treat upstream media—a crucial contribution to process optimization.
- Thermal separation processes: In distillation columns, heat exchangers —typically shell-and-tube heat exchangers—perform key tasks such as the condensation of vapors or the targeted heating of mixtures.
2. Oil and Gas Industry
- Refinery processes: Double-pipe heat exchangers are essential components of plant engineering for the condensation of water vapor or process gases.
- Temperature control of lubricants: The targeted cooling of lubricating oils ensures the operational reliability of rotating equipment.
- Gas processing: As gas heat exchangers, they enable the precise temperature control of natural gas—whether for dehumidification, separation, or further processing steps.
3. Energy and Power Plant Technology
- Heat recovery from exhaust gas streams: In thermal power plants, double-pipe heat exchangers are used to return energy to the process.
- Condensation after the steam turbine: They efficiently convert the expanded steam back into liquid, thereby ensuring the cycle.
- Primary/secondary circuit coupling: In district heating systems, they ensure reliable heat exchange between independent systems.
4. Food and Beverage Processing
- Product safety through pasteurization: Products such as milk or fruit juices are heat-treated and then rapidly cooled.
- Process temperature control: In breweries, dairies, and production lines, heat exchangers ensure that temperatures remain constant.
- Equipment cooling: Technical units maintain efficient performance levels through targeted cooling.
5. Shipbuilding and maritime applications
- Engine cooling: Double-pipe heat exchangers provide thermal relief for ship propulsion systems, generators, and hydraulic systems.
- Seawater cooling circuits: Robust designs enable the direct use of seawater to cool a wide variety of onboard systems.
6. Metal and Steel Processing
- Cooling of thermal processes: In furnaces, rolling mills, and annealing lines, heat exchangers ensure the targeted dissipation of excess process heat.
- Process bath conditioning: During electroplating or in chemical treatment baths, they ensure the required bath temperatures are maintained.
Industry Solutions with Double-Pipe Heat Exchangers
As an experienced manufacturer of high-quality heat exchanger technology, THIELMANN ENERGIETECHNIK GmbH is known for providing customized solutions in the field of thermal process engineering. Our double-pipe heat exchangers are specifically designed to operate reliably, efficiently, and safely in complex industrial processes—even under extreme conditions. They enable precise temperature control for a wide variety of gaseous and liquid media used across a broad range of industries.
Machinery and Plant Engineering:
In general machinery and plant engineering, our double-pipe heat exchangers are an integral part of the process cooling or heating of media in production lines, test benches, or hydraulic systems. The modular design allows for easy integration into existing plant concepts, while delivering high thermal performance and mechanical stability.
Chemical, Petrochemical, and Polymer Plants:
The chemical and petrochemical industries place particularly high demands on material selection, leak tightness, and temperature and pressure resistance. Our solutions meet these requirements without compromise. In polymer plants, for example, our double-pipe heat exchangers for liquids are used for the precise temperature control of reaction-sensitive media—whether for superheating, cooling, or heat recovery.
Natural gas production:
In the production and processing of natural gas, our systems enable the precise conditioning of the gas prior to downstream process steps. This includes both cooling after compression and targeted heating using gas preheaters prior to further processing or injection into the grid. The robust design ensures safe operation even with abrasive or corrosive media.
Food Industry:
In food processing, our double-pipe heat exchangers stand out thanks to their hygienic design, which makes cleaning and maintenance particularly efficient. Applications include pasteurization, product cooling, and water treatment, among others. Quality assurance, energy efficiency, and process reliability are always our top priorities.
Shipbuilding & Maritime Applications:
At sea, there are specific requirements regarding space constraints, corrosion resistance, and operational reliability. Our coaxialdouble-pipe heat exchangers are suitable for use with seawater and perform tasks such as engine cooling, temperature control of technical media, and the operation of closed cooling circuits in engine rooms.
Industrial Applications:
Whether in the metalworking industry, in plastics processing plants, or in automation—double-pipe heat exchanger suppliers such as THIELMANN offer an effective solution for media-separated heat exchange. They ensure constant operating temperatures, protect sensitive processes from thermal instability, and thus increase the overall efficiency of plants.
Process Industry & Special Applications:
Our expertise is particularly evident when dealing with complex or non-standard requirements. In the general process industry, we develop custom solutions where standardized heat exchanger designs fall short. This also applies to special applications involving specific media, extreme operating parameters, or unique installation conditions. Thanks to our engineering expertise and flexible manufacturing capabilities, we are able to reliably execute even the most unusual projects.
Machinery and Plant Engineering:
In general machinery and plant engineering, our double-pipe heat exchangers are an integral part of the process cooling or heating of media in production lines, test benches, or hydraulic systems. The modular design allows for easy integration into existing plant concepts, while delivering high thermal performance and mechanical stability.
Chemical, Petrochemical, and Polymer Plants:
The chemical and petrochemical industries place particularly high demands on material selection, leak tightness, and temperature and pressure resistance. Our solutions meet these requirements without compromise. In polymer plants, for example, our double-pipe heat exchangers for liquids are used for the precise temperature control of reaction-sensitive media—whether for superheating, cooling, or heat recovery.
Natural gas production:
In the production and processing of natural gas, our systems enable the precise conditioning of the gas prior to downstream process steps. This includes both cooling after compression and targeted heating using gas preheaters prior to further processing or injection into the grid. The robust design ensures safe operation even with abrasive or corrosive media.
Food Industry:
In food processing, our double-pipe heat exchangers stand out thanks to their hygienic design, which makes cleaning and maintenance particularly efficient. Applications include pasteurization, product cooling, and water treatment, among others. Quality assurance, energy efficiency, and process reliability are always our top priorities.
Shipbuilding & Maritime Applications:
At sea, there are specific requirements regarding space constraints, corrosion resistance, and operational reliability. Our coaxialdouble-pipe heat exchangers are suitable for use with seawater and perform tasks such as engine cooling, temperature control of technical media, and the operation of closed cooling circuits in engine rooms.
Industrial Applications:
Whether in the metalworking industry, in plastics processing plants, or in automation—double-pipe heat exchanger suppliers such as THIELMANN offer an effective solution for media-separated heat exchange. They ensure constant operating temperatures, protect sensitive processes from thermal instability, and thus increase the overall efficiency of plants.
Process Industry & Special Applications:
Our expertise is particularly evident when dealing with complex or non-standard requirements. In the general process industry, we develop custom solutions where standardized heat exchanger designs fall short. This also applies to special applications involving specific media, extreme operating parameters, or unique installation conditions. Thanks to our engineering expertise and flexible manufacturing capabilities, we are able to reliably execute even the most unusual projects.
Standards, Acceptance Testing, and Technical Design of Double-Pipe Heat Exchangers
THIELMANN ENERGIETECHNIK GmbH is known for its precision-engineered heat exchanger solutions, which are optimally tailored to the specific requirements of international industries. Our double-pipe heat exchangers are not developed as standard components, but as custom-designed systems—precisely tailored to the respective application, media, operating conditions, and applicable regulations.
International Regulations and Certifications
In today’s globally interconnected industry, compliance with country-specific norms and standards is crucial for the successful use of heat exchangers. As an experienced manufacturer, we produce custom designs in accordance with national and international regulations, including:
This regulatory flexibility enables us to carry out even the most demanding projects worldwide—in compliance with standards, with reliable documentation, and ready for acceptance.
Acceptance and testing according to customer specifications
We not only meet technical standards but also the specific testing requirements of major international companies. Our systems regularly pass audits and acceptance inspections conducted by leading operators, including BASF, OGE, Gascade, Sasol, INGL, ERI, Dolphin Energy, Saudi Aramco, Gasco, MAN, Jenbacher, MAPNA, Siemens, DONG, as well as in accordance with the TEMA standard. In doing so, we tailor all testing procedures, documentation, and material certifications precisely to the requirements of the respective customer project.
Technical Design for Extreme Operating Conditions
Our double-pipe heat exchangers are designed for demanding operating conditions:
Maximum flexibility in connection design
Another advantage of our tube-in-tube heat exchangers is the customer-specific nozzle arrangement. Whether axial, radial, or tangential—we tailor the design precisely to the on-site conditions and process requirements. This allows our heat exchangers to be seamlessly integrated into existing plant structures without the need for costly retrofits.
International Regulations and Certifications
In today’s globally interconnected industry, compliance with country-specific norms and standards is crucial for the successful use of heat exchangers. As an experienced manufacturer, we produce custom designs in accordance with national and international regulations, including:
- ASME (with or without a U-stamp) for the U.S. and international markets
- EN 13445 for pressure vessels in Europe
- SVTI for applications in Switzerland
- AS 1210 for the Australian market
- PD 5500 for the British market, as well as other special regulations upon request
This regulatory flexibility enables us to carry out even the most demanding projects worldwide—in compliance with standards, with reliable documentation, and ready for acceptance.
Acceptance and testing according to customer specifications
We not only meet technical standards but also the specific testing requirements of major international companies. Our systems regularly pass audits and acceptance inspections conducted by leading operators, including BASF, OGE, Gascade, Sasol, INGL, ERI, Dolphin Energy, Saudi Aramco, Gasco, MAN, Jenbacher, MAPNA, Siemens, DONG, as well as in accordance with the TEMA standard. In doing so, we tailor all testing procedures, documentation, and material certifications precisely to the requirements of the respective customer project.
Technical Design for Extreme Operating Conditions
Our double-pipe heat exchangers are designed for demanding operating conditions:
- Low-temperature applications down to -50°C—ideal for cryogenic processes or gases with low boiling points
- Design pressures up to 300 bar—suitable as high-pressure heat exchangers for high-pressure applications, e.g., in gas processing or power generation
- Design temperatures up to 250°C—reliable even under high thermal loads
- Suitable for sour gas in accordance with NACE MR0175/ISO 15156, e.g., for media containing hydrogen sulfide in the oil and gas industry
Maximum flexibility in connection design
Another advantage of our tube-in-tube heat exchangers is the customer-specific nozzle arrangement. Whether axial, radial, or tangential—we tailor the design precisely to the on-site conditions and process requirements. This allows our heat exchangers to be seamlessly integrated into existing plant structures without the need for costly retrofits.
Materials for Double-Pipe Heat Exchangers: From Carbon Steel to Titanium
THIELMANN ENERGIETECHNIK GmbH develops and manufactures high-precision double-pipe heat exchangers that are used in a wide variety of industrial applications worldwide. A key factor in the durability, operational reliability, and efficiency of our heat exchangers is the careful selection of suitable materials—tailored to the medium, temperature, pressure, and industry-specific requirements.
A wide range of materials for individual requirements
Our double-pipe heat exchangers are available in a wide variety of materials and can be manufactured either entirely from a single material or using a combination of different materials. This flexibility allows us to implement solutions that are precisely tailored to the respective operating conditions.
The following materials are used particularly frequently:
Special materials available upon request
In addition to standard and composite materials, THIELMANN ENERGIETECHNIK GmbH also offers solutions using special materials, such as for high-temperature applications, acidic gases (in accordance with NACE), or when the medium places particular stress on the material. These include, among others:
Material Selection Consulting and Material Testing
Our experts provide comprehensive advice on selecting suitable materials for our tube-in-tube heat exchangers—taking into account technical parameters, standard requirements, and economic considerations. Upon request, we offer a wide range of material-specific tests, including PMI (Positive Material Identification), 3.1/3.2 certificates, material analyses, and microstructural examinations.
A wide range of materials for individual requirements
Our double-pipe heat exchangers are available in a wide variety of materials and can be manufactured either entirely from a single material or using a combination of different materials. This flexibility allows us to implement solutions that are precisely tailored to the respective operating conditions.
The following materials are used particularly frequently:
- Carbon steel: Ideal for standard applications with low to moderate corrosion requirements. Carbon steel is characterized by high mechanical strength and cost-effectiveness—particularly in water, oil, or air applications under normal conditions.
- Stainless steel: (e.g., 1.4571 / 316Ti, 1.4404 / 316L) Stainless steel alloys offer excellent corrosion protection and are the first choice for aggressive media, high hygiene requirements, or thermally demanding processes. They are used, among other things, in the chemical industry, food processing, and in maritime and pharmaceutical applications.
- Material combinations of carbon steel and stainless steel: In many applications, selective material use makes sense—for example, when there are different requirements on the primary and secondary sides. For example, the inner tube (which carries the medium) can be made of corrosion-resistant stainless steel, while the outer protective tube is made of robust carbon steel. This enables an optimal balance between cost, functionality, and durability.
Special materials available upon request
In addition to standard and composite materials, THIELMANN ENERGIETECHNIK GmbH also offers solutions using special materials, such as for high-temperature applications, acidic gases (in accordance with NACE), or when the medium places particular stress on the material. These include, among others:
- Nickel-based alloys (e.g., Hastelloy, Inconel)
- Duplex and superduplex steels
- Titanium for highly corrosive or saline media
Material Selection Consulting and Material Testing
Our experts provide comprehensive advice on selecting suitable materials for our tube-in-tube heat exchangers—taking into account technical parameters, standard requirements, and economic considerations. Upon request, we offer a wide range of material-specific tests, including PMI (Positive Material Identification), 3.1/3.2 certificates, material analyses, and microstructural examinations.
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