Double-tube heat exchanger

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 that 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 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 materials suitable for the medium, 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. 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".

1. chemical and petrochemical industry

• Reactor temperature control: Shell and tube heat exchangers ensure stable temperature control in chemical reactors, thereby ensuring consistent reaction conditions.
• Energy efficiency through heat recovery: Process waste heat is used to thermally prepare upstream media - a decisive contribution to process optimization.
• Thermal separation processes: In distillation columns, heat exchangers take on central tasks such as the condensation of vapors or the targeted heating of mixtures.

2. oil and gas industry

• Refinery processes: For the condensation of water vapor or process gases, shell and tube heat exchangers are elementary components of plant technology.
• Temperature control of lubricants: The operational reliability of rotating systems is maintained through the targeted cooling of lubricating oils.
• Gas treatment: 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, shell and tube heat exchangers are used to return energy to the process.
• Condensation downstream of the steam turbine: They efficiently convert the expanded water vapor back into liquid and thus secure the cycle.
• Primary/secondary cycle cogeneration: In the district heating sector, they ensure the safe exchange of heat between independent systems.

4. food and beverage processing

• Product safety through pasteurization: Media such as milk or fruit juices are thermally treated and then quickly cooled down.
• Process temperature control: Heat exchangers ensure that constant temperatures are maintained in breweries, dairies and production lines.
• Plant cooling: Technical units remain at an efficient performance level thanks to targeted cooling.

5. shipbuilding and maritime applications

• Engine cooling: Shell and tube heat exchangers provide thermal relief for ship drives, generators and hydraulic systems.
• Seawater cooling circuits: Robust designs enable the direct use of seawater to cool a wide range of on-board systems.

6. metal and steel processing

• Cooling of thermal processes: In furnaces, rolling mills and annealing lines, heat exchangers ensure the targeted removal of excess process heat.
• Process bath conditioning: They ensure the required bath temperatures during electroplating or in chemical treatment baths.

As an experienced manufacturer of high-quality heat exchanger technology, THIELMANN ENERGIETECHNIK GmbH stands for customized solutions in the field of thermal process engineering. Our double-tube heat exchangers are specially designed to work 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 in a wide range of industries.

Mechanical and plant engineering:
In general mechanical and plant engineering, our double-tube heat exchangers are an integral part of process cooling or heating of media in production lines, test benches or hydraulic systems. The modular design allows easy integration into existing system concepts, while maintaining high thermal performance and mechanical stability.

Chemical, petrochemical & polymer systems:
The chemical and petrochemical industry places particularly high demands on material selection, tightness and temperature and pressure resistance. Our solutions meet these requirements without compromise. In polymer plants, for example, our double-tube heat exchangers are used for precise temperature control of reaction-sensitive media - whether for superheating, cooling or heat recovery.

Natural gas extraction:
In the extraction and processing of natural gas, our systems enable precise conditioning of the gas before downstream process steps. This includes both cooling after compression and targeted heating before further processing or injection. The robust design ensures safe operation even with abrasive or corrosive media.

Food industry:
In food processing, our double-tube heat exchangers score highly thanks to their hygienic design, which makes cleaning and maintenance particularly efficient. Applications include pasteurization, product cooling and water treatment. The focus is always on quality assurance, energy efficiency and process reliability.

Shipbuilding & maritime applications:
At sea, special requirements apply in terms of space, corrosion resistance and operational reliability. Our heat exchangers are suitable for use with seawater and perform tasks such as engine cooling, temperature control of technical media or the operation of closed cooling circuits in engine rooms.

Industrial applications:
Whether in the metalworking industry, in plastics processing plants or in automation - THIELMANN double-tube heat exchangers 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 systems.

Process industry & special applications:
Our expertise is particularly evident in complex or non-standardized requirements. In the general process industry, we develop customer-specific solutions where standardized heat exchanger concepts are not sufficient. This also applies to special applications involving special media, extreme operating parameters or special installation conditions. Thanks to our engineering expertise and flexible production, we are also able to reliably implement unusual projects.

THIELMANN ENERGIETECHNIK GmbH stands for precisely designed heat exchanger solutions that are optimally tailored to the specific requirements of international industries. Our double-tube heat exchangers are not developed as standard components, but as individually designed systems - precisely tailored to the respective area of application, media, operating conditions and applicable regulations.

International regulations and certifications

In the globally networked industry, compliance with country-specific norms and standards is crucial for the successful use of heat exchangers. As an experienced manufacturer, we implement customer-specific designs in accordance with national and international regulations, including

• ASME (with or without U-Stamp) for the American and international market
• EN 13445 for pressurized tanks in Europe
• SVTI for applications in Switzerland
• AS 1210 for the Australian market
• PD 5500 for the British market and other special regulations on request

This regulatory flexibility enables us to implement even the most demanding projects worldwide - in compliance with standards, with reliable documentation and ready for acceptance.

Acceptances and tests according to customer specifications

We not only meet the technical standards, but also the specific testing requirements of major international companies. Our systems are regularly and successfully inspected and approved by leading operators, including BASF, OGE, Gascade, Sasol, INGL, ERI, Dolphin Energy, Saudi Aramco, Gasco, MAN, Jenbacher, MAPNA, Siemens, DONG and in accordance with the TEMA standard. We adapt all test procedures, documentation and material certificates precisely to the requirements of the respective customer project.

Technical design for extreme operating conditions

Our double-tube heat exchangers are designed for demanding operating conditions:

• Low temperature applications down to -50 °C - ideal for cryogenic processes or gases with a low boiling point
• Design pressures up to 300 bar - suitable for high-pressure applications, e.g. in gas treatment or energy technology
• Design temperatures up to 250 °C - reliable even at high thermal loads
• Suitable for sour gas in accordance with NACE MR0175/ISO 15156, e.g. for media contaminated with hydrogen sulphide in the oil and gas industry

Maximum flexibility in connection technology

Another advantage of our double-tube heat exchangers is the customer-specific connection arrangement. Whether axial, radial or tangential - our design is based precisely on the on-site conditions and process requirements. This means that our heat exchangers can be easily integrated into existing system structures without the need for cost-intensive conversion work.

THIELMANN ENERGIETECHNIK GmbH develops and manufactures high-precision double-tube heat exchangers that are used in a wide range of industrial applications worldwide. A decisive factor for the durability, operational reliability and efficiency of our heat exchangers is the targeted selection of suitable materials - tailored to the medium, temperature, pressure and industry-specific requirements.

Variety of materials for individual requirements

Our double-tube heat exchangers are available in a wide range of materials and can be manufactured either entirely from one material or in a combination of different materials. This flexibility allows us to realize 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 medium corrosion requirements. Carbon steel is characterized by high mechanical strength and cost-effectiveness - especially 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 in the chemical industry, food processing and in maritime and pharmaceutical applications, among others.
• Material combinations of carbon steel and stainless steel: In many applications, selective use of materials makes sense - for example, if there are different requirements on the primary and secondary sides. For example, the inner pipe (carrying the medium) can be made of corrosion-resistant stainless steel, while the outer protective pipe is made of robust carbon steel. This enables an optimum balance between cost, functionality and durability.

Special materials on request

In addition to standard and combination materials, THIELMANN ENERGIETECHNIK GmbH also offers solutions with special materials, for example for high-temperature applications, acid gases (in accordance with NACE) or for media-related material stresses. These include, among others:

• Nickel-based alloys (e.g. Hastelloy, Inconel)
• Duplex and super duplex steels
• Titanium for particularly corrosive or saline media

Material consulting and material testing

Our experts provide you with comprehensive advice on the selection of suitable materials - taking into account technical parameters, standard requirements and economic aspects. On request, we offer a wide range of material-specific tests, including PMI (Positive Material Identification), 3.1/3.2 certificates, material analyses and microstructural investigations.