1. Overview of Danfoss S201-IS16-614-TKTM72

In industrial systems installed on marine vessels and offshore facilities, temperature control is not merely a matter of efficiency but is directly related to the stability and reliability of the entire system. Equipment such as engines, lubricating oil, cooling water systems, HVAC systems and various auxiliary systems must all be maintained within appropriate temperature limits throughout operation.

In such systems, a plate heat exchanger is one of the key pieces of equipment used to transfer heat between fluid circuits without allowing the fluids to come into direct contact with each other.

Danfoss S201-IS16-614-TKTM72 is a model in the S201 series within Danfoss’s SONDEX® Standard Plate Heat Exchangers portfolio. In Danfoss’s product portfolio, S201 is classified under Standard Fishbone plates, belonging to the gasketed plate heat exchanger range.

A noteworthy aspect of this model is its marine/offshore application context, particularly when the equipment must operate in a marine environment. This operating condition differs significantly from conventional onshore heat exchanger systems because the system must simultaneously address heat transfer requirements, pressure limitations, maintainability, and issues associated with seawater, fouling and corrosion.

Danfoss currently identifies marine/offshore as one of the application areas for its Standard Plate Heat Exchangers, with typical applications including central cooling and lubrication oil cooling.

Therefore, when evaluating Danfoss S201-IS16-614-TKTM72, the product should be considered not only as a heat exchanger but also as equipment serving thermal systems in a marine/offshore environment with demanding operating requirements.

2. How is Danfoss S201-IS16-614-TKTM72 used in a marine environment?

2.1. Characteristics of thermal systems on vessels and offshore facilities

On marine vessels or offshore facilities, numerous items of equipment generate heat during operation. Engines, generators, lubricating oil, hydraulic systems and auxiliary equipment can all generate significant amounts of heat.

If this heat is not continuously removed, the fluid temperature will increase and may affect:

• Oil viscosity;
• Lubrication efficiency;
• Equipment stability;
• Component service life;
• Operating efficiency;
• Overall system reliability.

Therefore, cooling systems on vessels and offshore facilities are often designed to establish a stable heat-rejection circuit, in which the heat exchanger serves as an intermediate heat-transfer device.

2.2. Role of the Heat Exchanger

A typical configuration can be generally represented as:

Equipment requiring cooling → Heat Exchanger → Cooling Circuit

Heat from the hot fluid is transferred through the plates to a colder cooling medium.

In some marine systems, seawater can be used as the cooling medium. However, instead of routing seawater directly through all equipment requiring cooling, a heat exchanger can be used to separate the seawater circuit from the freshwater or process-fluid circuit.

This arrangement allows better control over the exposure of equipment to seawater.

Danfoss identifies marine/offshore as an application area for its Standard Plate Heat Exchangers and lists functions such as central cooling and lubrication oil cooling.

2.3. Why do offshore applications have more demanding requirements?

A heat exchanger operating offshore has to deal with multiple factors simultaneously:

• Seawater contains chlorides and ions that can promote corrosion;
• Seawater may carry deposits and fine particles;
• Fouling may develop on heat-transfer surfaces;
• Marine organisms or organic matter may be present;
• The system may be required to operate continuously;
• Maintenance space on vessels or offshore platforms may be limited;
• System shutdowns for maintenance can significantly affect overall operations.

Therefore, heat exchanger selection for marine/offshore applications must consider heat transfer performance, materials, pressure capability, cleanability and fluid filtration at the same time.

2.4. Actual application in the East Sea of Vietnam

According to the actual application information being utilized by the business, Danfoss S201-IS16-614-TKTM72 is used in the East Sea of Vietnam. This is a notable point when introducing the product because the East Sea marine environment imposes demanding real-world operating conditions compared with the use of a heat exchanger in a conventional onshore industrial water system.

However, the following distinction should be made clearly:

• Danfoss has published that its Standard Plate Heat Exchanger range is used in marine/offshore applications;
• S201 is classified by Danfoss under the Standard Fishbone plate group;
• The fact that the specific S201-IS16-614-TKTM72 model is installed at a particular project in the East Sea of Vietnam is project-specific application information and should be verified against the project’s documentation, equipment nameplate or technical documentation.

Therefore, when presenting the product, the actual application in the East Sea marine environment can be highlighted, but it should not be inferred that every S201 configuration has identical specifications or certifications for every offshore project.

3. What is a gasketed plate heat exchanger?

A gasketed plate heat exchanger is a heat-transfer device that uses multiple thin metal plates compressed together to form a plate pack.

The plates are arranged alternately to create separate flow channels for two fluids.

One side may carry the hot fluid, while the other carries a colder fluid.

The two fluids do not come into direct contact; instead, they are separated by the plate material. Heat is transferred from the higher-temperature fluid through the metal plate to the lower-temperature fluid.

3.1. Basic construction

A typical gasketed plate heat exchanger consists of:

• Heat-transfer plates;
• Gaskets;
• Fixed frame;
• Movable/follower frame;
• Guide bars;
• Tightening system;
• Connection ports;
• Plate pack.

Among these components, the heat-transfer plates largely determine the heat-transfer characteristics, while the gaskets provide sealing and separation between the fluid channels.

3.2. Role of the gaskets

Gaskets are installed in dedicated grooves on the plates.

When the plates are compressed, the gaskets create sealed areas between the plates, direct the fluid flow and minimize the risk of leakage between the two fluids.

For marine/offshore applications, gasket material selection must be based on:

• Temperature;
• Pressure;
• Fluid type;
• Chemical properties;
• Operating conditions;
• Maintenance requirements.

A gasket type suitable for all applications should not be assumed solely based on the heat exchanger model number.

4. Danfoss S201 – Standard Fishbone Plate Heat Exchanger

4.1. S201 in the Danfoss portfolio

Danfoss offers a portfolio of SONDEX® gasketed plate heat exchangers with various plate technologies. Within this portfolio, S201 is listed under the Standard Fishbone plates group.

This indicates that S201 belongs to the standard plate heat exchanger range using SONDEX® Fishbone plate technology.

4.2. Fishbone technology

Fishbone plates feature a pressed surface pattern that creates characteristic flow channels.

As the fluid passes through the channels between the plates, the geometry of the channels changes the flow direction and promotes turbulence.

The objectives of this design include:

• Increasing heat-transfer performance;
• Making effective use of the allowable pressure drop;
• Promoting fluid distribution across the plate surface;
• Reducing low-flow regions;
• Optimizing the number of plates required for a specific heat-transfer duty.

Danfoss states that SONDEX® Fishbone technology is used on a large proportion of its plate heat exchangers, and pattern variants can be selected with different pressing depths, pitches and angles depending on the heat-transfer duty.

4.3. Optimizing the balance between heat transfer and pressure drop

In heat exchanger design, heat-transfer performance cannot be maximized while ignoring pressure drop.

A heat exchanger with excellent heat transfer but excessive pressure loss may increase pump requirements and operating energy consumption.

Conversely, if the pressure drop is too low, the flow velocity may be insufficient to create the required level of turbulence.

Therefore, Fishbone design aims to balance:

Heat Transfer Performance ↔ Pressure Drop ↔ Flow Rate ↔ Number of Plates

This is one reason why a heat exchanger should be selected based on actual operating data rather than pipe size alone.

5. Construction of Danfoss S201-IS16-614-TKTM72

5.1. Heat-transfer plates

The plates are the components directly involved in the heat-transfer process.

The pressed surface pattern creates flow channels and increases the effective contact area between the fluid and the plate material.

Danfoss offers various plate materials within its Standard Plate Heat Exchanger portfolio, including AISI 304, AISI 316, titanium and other materials depending on the requirements.

5.2. Gaskets

Gaskets are installed between the plates and perform the sealing function.

Danfoss’s gasket material options within the portfolio include EPDM-HT, NBR-HT and Viton, with the actual selection depending on the fluid and operating temperature.

5.3. Frame

The plate pack is held between the frame components.

The frame must provide sufficient rigidity and maintain the appropriate compression force during operation.

For a gasketed plate heat exchanger, the ability to open the frame is an important advantage when inspection, cleaning or servicing is required.

5.4. Connection ports

The connection ports allow fluid to enter and leave the heat exchanger.

The actual connection type must be confirmed from the configuration of S201-IS16-614-TKTM72 and should not be assumed from the model code alone.

5.5. Tightening and alignment system

The plates must be held in the correct position and compressed with the appropriate force.

Danfoss also develops alignment solutions for plate packs to support plate stability during assembly.

6. Operating principle in marine/offshore systems

The operating principle of Danfoss S201 can be generally described as follows:

Hot fluid → Hot channel → Heat-transfer plate → Cold channel → Cold fluid

The two fluid streams pass through alternating channels.

In a counter-current-flow arrangement, the hot and cold fluids move in opposite directions. This configuration is commonly used to make effective use of the temperature difference during heat transfer.

For example, in a cooling system:

Seawater → Danfoss S201 → Freshwater

The seawater receives heat from the freshwater circuit through the heat-transfer plates.

Alternatively, in an oil-cooling system:

Hot Lubricating Oil → Danfoss S201 → Cooling Medium

The lubricating oil is cooled through heat transfer across the plate pack.

Danfoss lists central cooling and lubrication oil cooling among typical marine/offshore applications for its Standard Plate Heat Exchangers.

7. Special application: Heat transfer in seawater-based systems

This is one of the most important aspects when analyzing Danfoss S201-IS16-614-TKTM72 for marine applications.

7.1. Seawater as a cooling medium

The sea is a large heat sink and can be used as a cooling medium.

In a suitable system, seawater is pumped through one side of the heat exchanger, while freshwater or the fluid requiring cooling flows through the other side.

Heat is transferred through the plates.

A general schematic can be represented as:

Equipment → Hot Freshwater Circuit → Danfoss S201 → Seawater Circuit → Discharge/Recirculation

The actual configuration depends on the design of each system.

7.2. Why use an intermediate circuit?

One of the major challenges with seawater is its corrosive nature and its potential to carry fouling-causing substances.

If seawater is routed directly through the entire equipment system, many components may be exposed directly to the marine environment.

Using a heat exchanger as the separation point allows the system to be designed around:

Main Equipment → Freshwater/Closed Loop → Heat Exchanger → Seawater

This limits direct seawater exposure primarily to the part of the system specifically designed to handle the marine environment.

7.3. Central Cooling

In a central cooling system, a central cooling-water circuit can serve multiple pieces of equipment.

The heat exchanger removes heat from this circuit.

This approach can create a centralized cooling system and improve temperature control and system arrangement.

7.4. Lubrication Oil Cooling

Lubricating oil needs to be maintained within an appropriate temperature range to ensure proper lubrication.

If the temperature becomes excessively high, the properties of the oil may change and affect its ability to protect friction surfaces.

A heat exchanger can be used to transfer heat from the oil to the cooling medium.

Danfoss lists lubrication oil cooling as one of the marine/offshore applications of its Standard Plate Heat Exchangers.

8. Challenges when using a Heat Exchanger in the East Sea of Vietnam

The marine environment presents numerous challenges that may be less significant in an onshore heat-transfer system.

8.1. Corrosion caused by seawater

Seawater contains chlorides and dissolved constituents that can increase the risk of corrosion for certain metallic materials.

Therefore, plate material must be selected based on:

• Fluid type;
• Chloride concentration;
• Temperature;
• Flow velocity;
• Exposure time;
• Operating conditions.

This is one reason Danfoss offers multiple plate material options, including AISI 316 and titanium for suitable configurations.

8.2. Fouling

Fouling is the accumulation of deposits, organic matter or other substances on heat-transfer surfaces.

As fouling increases:

• Thermal resistance increases;
• Heat transfer decreases;
• Pressure drop may increase;
• Outlet temperature may change;
• Overall system efficiency decreases.

In marine environments, this is a particularly important issue.

8.3. Fine particles and foreign matter

Seawater may carry fine particles.

If these particles enter the plate pack, they may accumulate or affect flow distribution.

Danfoss recommends suitable inline filtration where the fluid contains particles exceeding the limits appropriate for the heat exchanger’s free-flow channels.

8.4. Marine organisms

For seawater intake systems, algae, marine organisms or organic matter can also become sources of fouling.

Therefore, a seawater filtration system upstream of the heat exchanger plays an important role.

9. Plate and gasket materials and suitability for marine environments

9.1. Plate materials

Within its Standard Plate Heat Exchanger portfolio, Danfoss publishes plate material options including:

• AISI 304;
• AISI 316;
• Titanium;
• SMO;
• Hastelloy;
• Other materials upon request.

Not every material is applicable to every model or configuration. Selection must be based on the actual duty and fluid properties.

9.2. AISI 316

AISI 316 is commonly considered for environments requiring higher corrosion resistance than AISI 304.

However, it should not be understood that using AISI 316 completely eliminates the risk of corrosion in seawater.

Material selection must consider the complete operating environment.

9.3. Titanium

Titanium is an important option for applications requiring high corrosion resistance.

Danfoss includes titanium among its plate material options for Standard Plate Heat Exchangers.

9.4. Gasket materials

Danfoss offers several gasket options, including:

• EPDM-HT;
• NBR-HT;
• Viton.

The appropriate gasket type must be selected according to the fluid and operating temperature.

Therefore, when ordering or replacing gaskets for S201-IS16-614-TKTM72, the actual equipment configuration should be checked rather than relying only on the S201 model designation.

10. Sea Water Filter and solutions for reducing fouling

In marine/offshore applications, a seawater filter can play an important role in protecting the plate heat exchanger.

Danfoss has documentation specifically addressing sea water filters for plate heat exchangers used on vessels or offshore platforms.

The filter retains fine particles before they enter the plate pack, thereby helping extend the interval between service and maintenance operations.

A general configuration may be:

Seawater Intake → Sea Water Filter → Pump → Danfoss S201 → Discharge

Where:

Sea Water Filter

helps reduce the quantity of particles entering the heat exchanger.

Danfoss S201

performs the heat-transfer process.

Monitoring

tracks temperature, pressure and pressure drop to identify fouling trends.

10.1. Monitoring Pressure Drop

When the pressure drop gradually increases at the same flow rate, this may indicate fouling or blockage and should prompt an inspection.

Therefore, monitoring:

• Inlet pressure;
• Outlet pressure;
• Differential pressure;
• Flow rate;
• Inlet temperature;
• Outlet temperature

can help evaluate operating condition.

10.2. Do not rely only on scheduled cleaning

Cleaning intervals should be based on actual system operating conditions.

If the heat exchanger is cleaned too infrequently, performance may decline.

If it is cleaned too frequently, maintenance costs and unnecessary intervention may increase.

Therefore, establishing maintenance intervals based on actual operating data is generally more appropriate.

11. Technical specifications and configuration code of S201-IS16-614-TKTM72

The model under consideration is:

Danfoss S201-IS16-614-TKTM72

Within the Danfoss portfolio, S201 belongs to the Standard Fishbone plate heat exchanger group.

For the Standard Plate Heat Exchanger range, Danfoss publishes the following portfolio-level technical range:

Item	Information
Product family	SONDEX® Standard Plate Heat Exchangers
Plate type	Standard Fishbone
Model	S201-IS16-614-TKTM72
Plate materials	AISI 304/316, Titanium, SMO, Hastelloy*
Gasket materials	EPDM-HT, NBR-HT, Viton*
Connection range	DN25–DN600
Working pressure	Up to 35 bar*
Working temperature	-20°C to 180°C*
Marine/offshore applications	Central cooling, lubrication oil cooling

*The above values represent the published range for the Standard Plate Heat Exchanger portfolio and do not mean that all values apply simultaneously to the specific S201-IS16-614-TKTM72 configuration. The actual configuration must be confirmed against the equipment datasheet/nameplate and technical documentation.

In particular, the individual elements:

IS16 – 614 – TKTM72

should not be decoded without the corresponding configuration sheet or official Danfoss quotation for this model.

In practice, a configuration code may contain information related to the frame, plate, gasket, connections, number of plates or flow arrangement. However, each element must be verified against the relevant ordering documentation.

12. Advantages of Danfoss S201 in offshore applications

12.1. High heat-transfer performance

Fishbone technology is developed by Danfoss to achieve high heat-transfer performance while making effective use of the allowable pressure drop.

12.2. Compact design

Compared with many other heat-transfer solutions, a gasketed plate heat exchanger can provide high heat-transfer capacity within a relatively compact design.

This is a significant advantage for vessels and offshore facilities, where installation space is often limited and valuable.

Danfoss also emphasizes compact footprint and convenient access for inspection, cleaning and service.

12.3. Openable for cleaning

A major advantage of a gasketed plate heat exchanger is that the plate pack can be opened when maintenance is required.

This is particularly useful in environments with a high fouling risk.

12.4. Material selection flexibility

Danfoss offers multiple plate and gasket material options to accommodate different fluid properties and operating conditions.

12.5. Suitable for marine/offshore applications

Danfoss identifies marine/offshore as a key application group for Standard Plate Heat Exchangers.

In addition, the manufacturer’s documentation addresses features and accessories for marine/offshore environments, including sea water filters.

13. Installation and operation of S201 in seawater systems

For a heat exchanger operating in a marine environment, piping design and operating conditions are just as important as the heat exchanger itself.

13.1. Filtration upstream of the Heat Exchanger

A suitable filtration solution should be provided before seawater enters the plate heat exchanger.

Danfoss also refers to inline filters as an additional protection layer when the fluid contains particles that may affect the plate pack.

13.2. Cleaning the piping before connection

The piping should be cleaned and flushed before connecting the heat exchanger to minimize foreign matter entering the plate pack.

This step is particularly important for newly installed systems or systems that have undergone maintenance.

13.3. Flow control

The flow rate must remain within the design range.

Excessively low flow may reduce heat-transfer performance and change flow characteristics.

Excessively high flow may increase pressure drop and affect pump requirements.

13.4. Temperature monitoring

The following parameters should be monitored:

• Inlet temperature;
• Outlet temperature;
• Temperature approach;
• Temperature difference between the two sides.

These data help evaluate heat-transfer performance during operation.

14. Maintenance of Danfoss S201 in a marine environment

14.1. Fouling inspection

Fouling can reduce heat-transfer performance.

If the outlet temperature changes abnormally or pressure drop increases compared with the initial operating condition, the plate pack should be inspected.

14.2. Gasket inspection

Gaskets should be inspected periodically for:

• Aging;
• Deformation;
• Cracking;
• Loss of elasticity;
• Leakage.

14.3. Plate inspection

When the heat exchanger is opened for maintenance, the following should be inspected:

• Deposits;
• Corrosion;
• Mechanical damage;
• Deformation;
• Gasket groove condition.

14.4. Cleaning

Depending on the type of fouling and plate material, an appropriate cleaning method can be selected.

Cleaning chemicals must be checked for compatibility with:

• Plate material;
• Gasket material;
• Fouling type;
• Chemical concentration;
• Temperature;
• Contact time.

A single generic CIP procedure should not be applied to every configuration.

14.5. Marine-specific instrumentation

Danfoss also provides instrumentation solutions for marine applications, including thermometers, valves for drainage/air bleeding and pressure gauges depending on the configuration.

These devices provide operators with additional data for monitoring system condition and supporting maintenance activities.

15. Why is Danfoss S201 suitable for demanding marine/offshore systems?

Danfoss S201-IS16-614-TKTM72 is noteworthy not only because it is a plate heat exchanger but also because it belongs to a portfolio developed by Danfoss for a wide range of industrial heat-transfer duties, including marine/offshore applications.

The key factors can be summarized as follows:

1. Fishbone technology

Fishbone plates are designed to achieve high heat-transfer performance while making effective use of the allowable pressure drop.

2. Gasketed design

Allows the plate pack to be opened for inspection, cleaning and service.

3. Multiple material options

Danfoss offers various plate and gasket materials to suit different fluid types and operating conditions.

4. Marine/offshore applications

Danfoss officially lists marine/offshore among the application areas of its Standard Plate Heat Exchangers, including central cooling and lubrication oil cooling.

5. Seawater solutions

Sea water filters are among the solutions Danfoss discusses for plate heat exchangers used on vessels and offshore platforms.

6. Maintainability

The plate heat exchanger design provides access to the plate pack for inspection and cleaning, an important factor in systems with fouling risk.

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16. Conclusion – Danfoss S201-IS16-614-TKTM72 in East Sea marine applications

Danfoss S201-IS16-614-TKTM72 is a model in the SONDEX® Standard Plate Heat Exchangers range, using a plate configuration belonging to Danfoss’s Standard Fishbone group.

The key aspect when analyzing this model is its marine/offshore application environment.

In a system operating in the East Sea, the heat exchanger must not only ensure heat transfer but must also be evaluated as part of an integrated system consisting of:

Seawater → Filtration → Heat Exchanger → Cooling Circuit → Monitoring → Maintenance

In this arrangement, seawater can serve as the cooling medium, while the heat exchanger acts as the intermediate heat-transfer device between the seawater circuit and the freshwater, oil or other fluid requiring cooling, depending on the system design.

Factors such as corrosion, chlorides, fouling, fine particles, marine organisms, pressure drop and maintainability must all be considered during system design and operation.

This is also why the selection of plate material, gasket, flow configuration, filtration and operating conditions must be based on the actual data of each system.

Danfoss currently confirms that its Standard Plate Heat Exchangers are used in marine/offshore applications and provides related solutions such as Fishbone plate technology and seawater filtration for these environments.

For S201-IS16-614-TKTM72, if the equipment is actually being used in the East Sea, this application information is valuable for evaluating the product from a practical engineering perspective. However, the detailed parameters of the IS16-614-TKTM72 configuration still need to be verified against the equipment nameplate, datasheet or technical documentation before being used for design, replacement or equivalent-equipment selection.

For projects requiring the selection or replacement of Danfoss/SONDEX plate heat exchangers, providing complete information on fluid, flow rate, inlet/outlet temperatures, pressure, allowable pressure drop, materials and environmental conditions is an important basis for determining the correct heat exchanger configuration for the system.