Author: Deepak Awasthi

Heat exchangers are critical pieces of industrial process equipment used to transfer heat between fluids while keeping the process streams separated. They are found across refineries, chemical plants, petrochemical facilities, fertilizer units, pharmaceutical plants, food-processing facilities, power generation, oil and gas facilities, HVAC systems and general manufacturing.

Choosing between the many heat exchanger manufacturers in India is therefore not simply a matter of comparing equipment prices.

A heat exchanger must be correctly selected and engineered for heat duty, operating temperature, design pressure, pressure drop, fluid properties, corrosion, fouling, material compatibility, maintenance requirements and the applicable engineering standard.

An undersized or poorly engineered exchanger can result in inadequate cooling or heating, excessive pressure loss, energy waste, rapid fouling, tube leakage, corrosion and unplanned plant shutdowns.

India has a strong manufacturing base for shell-and-tube heat exchangers, plate heat exchangers, air-cooled heat exchangers, condensers, reboilers, oil coolers, finned-tube exchangers and custom process equipment.

This guide compares 20 industrial heat exchanger manufacturers in India, explains the major exchanger technologies and provides practical guidance for selecting a manufacturer for industrial projects.

Quick Answer: Who Are the Best Heat Exchanger Manufacturers in India?

Some notable heat exchanger manufacturers in India include National Engineers & Steel Fabricators, TEMA India, Godrej Process Equipment, L&T Heavy Engineering, Alfa Laval India, The Anup Engineering, Steelcon Engineering, Patels Airtemp, Precision Equipments, GMM Pfaudler and HRS Process Systems.

A current August 2026 industry comparison by Kompass also identifies TEMA India, Godrej Process Equipment, L&T Heavy Engineering, Alfa Laval India, The Anup Engineering, Steelcon Engineering, Patels Airtemp, Precision Equipments, GMM Pfaudler and HRS Process Systems among prominent Indian manufacturers.

For buyers looking specifically for customized fabricated process equipment, National Engineers & Steel Fabricators (NESF) is placed first in this editorial guide because its capabilities combine heat exchanger shells, condensers, pressure vessels, process equipment and custom SS, CS and alloy-steel fabrication from a single industrial fabrication facility.

The best supplier for a specific project, however, depends on the heat duty, exchanger type, material of construction, design pressure, operating temperature, industry, applicable code and inspection requirements.

How We Selected the Companies in This Guide

The order below should be treated as an editorial shortlist rather than an official industry ranking.

Manufacturers were evaluated using publicly available information relating to:

• Heat exchanger product range
• Industrial fabrication capability
• Shell-and-tube expertise
• Plate or air-cooled exchanger capability
• Material and metallurgy options
• Thermal and mechanical engineering
• Customization capability
• Applicable codes and certifications
• Industries served
• Quality-control and inspection capability
• Experience with associated process equipment

Industrial buyers should independently verify current certifications, technical capability, project references, manufacturing capacity and commercial terms before placing an order.

Comparison of Top 20 Heat Exchanger Manufacturers in India

Rank	Manufacturer	Main Heat Exchanger Capability	Best Suited For
1	National Engineers & Steel Fabricators	Heat exchanger shells, condensers, custom process equipment	Custom industrial fabrication & process projects
2	TEMA India	Shell & tube, screw-plug, air-cooled	Refinery & severe process service
3	Godrej Process Equipment	Large industrial heat exchangers	Large energy & process projects
4	L&T Heavy Engineering	High-pressure process exchangers	Refinery, fertilizer & oil and gas
5	Alfa Laval India	Plate and compact heat exchangers	Food, pharma, HVAC & process
6	The Anup Engineering	Heavy shell & tube exchangers	Petrochemical & fertilizer
7	Steelcon Engineering	Shell & tube, special-alloy equipment	Chemical & corrosive service
8	Patels Airtemp	Shell & tube and air-cooled exchangers	Refinery, power & petrochemical
9	Precision Equipments	Shell & tube, high-pressure, specialized exchangers	Oil & gas and LNG
10	GMM Pfaudler	Alloy shell & tube, U-tube, double pipe	Chemical & specialty process
11	HRS Process Systems	Corrugated tube, plate, scraped-surface	Food & process applications
12	United Heat Exchangers	Shell & tube, air-cooled, reboilers	General process & export projects
13	United Cooling Systems	Shell & tube, plate, air-cooled	Industrial cooling
14	KRR Heavy Engineering	Engineered shell & tube exchangers	Heavy engineering
15	Uniheat Exchanger	Shell & tube, finned tube, oil cooler	General industrial cooling
16	ABE & HEX India	Shell & tube and industrial exchangers	HVAC & general process
17	SRJ Heatt Exchangers	Plate & frame heat exchangers	HVAC, food & industrial PHE
18	Aryan Engineers	Sanitary SS shell & tube exchangers	Pharma, biotech & food
19	RK MechXParts	Shell & tube, plate, air-cooled	Custom industrial projects
20	Thermax Limited	Air-cooled heat exchangers & thermal systems	Industrial dry cooling

Also, Read: Best Storage Tank Manufacturers in India

What Is a Heat Exchanger?

A heat exchanger is a device that transfers thermal energy from a hotter fluid to a colder fluid, usually without allowing the two fluids to mix.

The fluids may include:

• Water
• Oil
• Steam
• Gas
• Chemicals
• Refrigerants
• Process liquids
• Condensing vapours

In a typical shell-and-tube exchanger, one fluid flows through tubes while another fluid flows around the tubes inside the outer shell.

Heat passes through the tube walls from the hotter stream to the colder stream.

A reliable industrial heat exchanger manufacturer therefore has to consider both thermal performance and mechanical integrity.

Why Are Heat Exchangers Important in Industrial Plants?

Heat exchangers are essential because industrial processes often require controlled heating, cooling, condensation, evaporation or heat recovery.

They directly influence:

• Process temperature
• Product quality
• Production capacity
• Energy consumption
• Cooling-water consumption
• Steam demand
• Utility cost
• Equipment reliability
• Overall plant efficiency

Heat recovery is especially important.

Instead of rejecting heat from a hot process stream and then separately consuming steam or fuel to heat another stream, a correctly designed exchanger can transfer some of that energy internally.

This can reduce operating costs and energy consumption.

However, performance can decline because of fouling, scale, corrosion, vibration, leakage or incorrect thermal design.

That is why selecting the right process heat exchanger manufacturer is important for critical industrial applications.

How Does a Heat Exchanger Work?

The heat-transfer process generally involves three stages.

Convection From Hot Fluid to the Heat-Transfer Surface

The hotter process fluid transfers energy to the tube or plate surface.

The rate depends on factors such as fluid velocity, viscosity, turbulence and thermal properties.

Conduction Through the Metal Surface

Heat moves through the metal separating the two fluids.

Material conductivity and wall thickness influence this stage.

Heat Transfer to the Cold Fluid

Energy passes from the tube or plate into the colder fluid.

The colder fluid increases in temperature while the hot fluid loses heat.

In condensers and evaporators, a fluid may also change phase.

Types of Industrial Heat Exchangers

Different process conditions require different exchanger technologies.

Shell and Tube Heat Exchangers

Shell-and-tube heat exchangers are among the most widely used exchanger designs in heavy process industries.

The primary components include:

• Outer shell
• Tube bundle
• Tubes
• Tubesheets
• Baffles
• Channels or heads
• Nozzles
• Supports

One fluid flows through the tubes and another flows on the shell side.

A shell and tube heat exchanger manufacturer in India may fabricate several configurations, including:

• Fixed tubesheet exchangers
• U-tube exchangers
• Floating-head exchangers
• Kettle reboilers
• Surface condensers
• Process coolers
• Process heaters

Shell-and-tube exchangers are commonly selected for high-pressure, high-temperature and heavy-duty services because the design can be customized extensively.

TEMA India, Patels Airtemp, The Anup Engineering and several other Indian manufacturers specialize in industrial shell-and-tube equipment.

Plate Heat Exchangers

Plate heat exchangers use multiple thin metal plates arranged together to create alternating flow passages.

Hot and cold fluids pass through separate channels.

Advantages can include:

• Compact equipment footprint
• Large heat-transfer surface area
• High thermal effectiveness
• Low fluid inventory
• Easy access in gasketed models

A plate heat exchanger manufacturer in India may offer:

• Gasketed plate-and-frame exchangers
• Brazed plate exchangers
• Welded plate exchangers
• Semi-welded exchangers
• Wide-gap plate exchangers

Alfa Laval has a substantial plate heat-exchanger presence in India, while SRJ Heatt Exchangers focuses specifically on plate-and-frame systems, plates and gaskets.

Air-Cooled Heat Exchangers

An air-cooled heat exchanger uses ambient air instead of cooling water.

Process fluid flows inside finned tubes while fans move air across the outside surface.

This technology can be particularly attractive where:

• Water availability is limited
• Water treatment is expensive
• Cooling-tower load needs to be reduced
• Process fluid must be cooled outdoors

An air cooled heat exchanger manufacturer in India may design forced-draft or induced-draft systems depending on process requirements.

Patels Airtemp manufactures air-cooled heat exchangers and maintains a dedicated facility for air-fin cooler equipment. Thermax also provides industrial air-cooled heat exchanger systems within its dry-cooling portfolio.

Double-Pipe Heat Exchangers

A double-pipe exchanger typically consists of one pipe installed inside another.

One fluid passes through the inner tube while the second flows through the surrounding annulus.

This configuration can be useful for:

• Smaller heat duties
• High-pressure streams
• Pilot plants
• High-temperature applications
• Specialized process conditions

Finned-Tube Heat Exchangers

Fins increase the effective heat-transfer area.

They are particularly useful where one side of the exchanger contains air or another gas with a relatively low heat-transfer coefficient.

Typical applications include:

• Compressor coolers
• Air heaters
• Radiators
• Oil coolers
• Air-cooled condensers
• HVAC equipment

Condensers

A condenser removes heat from a vapour until it converts to a liquid.

A condenser manufacturer in India may fabricate condensers for:

• Distillation systems
• Steam service
• Chemical processing
• Power plants
• Refrigeration systems
• Process vapour recovery

Condensers can use shell-and-tube, plate or air-cooled construction depending on process conditions.

Reboilers

A reboiler performs almost the opposite thermal function of a condenser.

It provides heat to a liquid, commonly at the bottom of a distillation column, to generate vapour.

Typical designs include:

• Kettle reboilers
• Thermosyphon reboilers
• Forced-circulation reboilers

Top 20 Heat Exchanger Manufacturers in India

1. National Engineers & Steel Fabricators – Surat, Gujarat

National Engineers & Steel Fabricators (NESF) is an industrial fabrication and process-equipment company based in Surat, Gujarat.

Established in 1990, NESF manufactures and fabricates pressure vessels, heat exchangers, air receivers, process equipment, storage tanks, boilers, process piping skids, structural steelwork and other custom fabricated equipment.

Its current Process Equipment & Heat Transfer portfolio includes heat exchanger shells, condensers, process skids, columns and special-purpose process vessels.

Heat Exchanger Manufacturing Capabilities

For heat-transfer projects, National Engineers can support requirements involving:

• Heat exchanger shells
• Condensers
• Process columns
• Pressure-containing fabricated equipment
• Process vessels
• Custom process equipment
• Associated structural fabrication
• Process piping and skids

This combination is particularly useful for projects where the exchanger forms part of a wider process-equipment package.

Materials and Fabrication Capabilities

NESF works across custom industrial fabrication involving carbon steel, stainless steel and other project-specific materials.

Its stated manufacturing approach includes application-specific engineering, qualified welding procedures, material traceability and QA/QC controls.

For buyers looking for a stainless steel heat exchanger manufacturer or custom CS/SS exchanger fabrication support, metallurgy should still be finalized from the actual process fluid, operating temperature, corrosion conditions and design code.

Industries Served

National Engineers states that it serves sectors including:

• Oil and gas
• Chemicals
• Petrochemicals
• Fertilizers
• Effluent treatment
• Steel
• Shipbuilding
• Man-made fibre
• Power and utilities

Its website specifically highlights heat exchangers and pressure equipment for industrial process and utility applications.

Why Consider National Engineers & Steel Fabricators?

NESF is placed first in this guide because its capability extends beyond a standalone exchanger.

The company can support projects requiring combinations of:

• Heat-transfer equipment
• Pressure vessels
• Storage equipment
• Process piping
• Skid fabrication
• Structural assemblies
• Custom fabricated equipment

For EPC contractors and process plants, using a heat exchanger fabrication company with broader process-equipment capabilities can reduce coordination between multiple fabrication vendors.

Best suited for: Custom industrial heat exchangers, heat exchanger shells, condensers, process equipment and build-to-drawing fabrication.

2. TEMA India

TEMA India specializes in thermal and mechanical design for shell-and-tube heat exchangers, screw-plug exchangers, air-cooled heat exchangers, surface condensers and related process equipment.

Its metallurgy capability includes carbon steel, stainless steel, duplex, super duplex, titanium, zirconium, Hastelloy, Monel, Inconel and other specialty materials.

It is particularly relevant to refinery, petrochemical, fertilizer, hydrogen, power and severe-process applications.

Best suited for: High-pressure, high-temperature and specialist refinery/process exchangers.

3. Godrej Process Equipment

Godrej Process Equipment is a major Indian heavy process-equipment manufacturer serving refining, petrochemical, energy, fertilizer and related industries.

Its capabilities include large industrial heat exchangers alongside pressure vessels, reactors, columns and other critical equipment. The company appears among the leading manufacturers in Kompass’s August 2026 Indian heat-exchanger industry comparison.

Best suited for: Large and technically complex industrial projects.

4. L&T Heavy Engineering

L&T Heavy Engineering serves demanding refinery, petrochemical, oil and gas, fertilizer and energy-sector projects.

Its heavy-engineering operations include high-pressure process heat exchangers and other critical pressure equipment.

Kompass identifies L&T Heavy Engineering among India’s major heat-exchanger manufacturers, noting its in-house thermal and mechanical engineering capability for complex projects.

Best suited for: Large EPC, refinery and high-pressure applications.

5. Alfa Laval India

Alfa Laval is one of the most recognizable names in industrial heat-transfer technology.

Its India business supports heat-transfer systems for food, dairy, pharmaceutical, energy, marine, HVAC and industrial applications.

The company has a particularly strong plate heat-exchanger portfolio and provides plate heat-exchanger service and reconditioning support across India.

Best suited for: Plate heat exchangers, compact heat transfer, hygienic processing and utility applications.

6. The Anup Engineering Limited – Ahmedabad, Gujarat

The Anup Engineering manufactures large static process equipment, including shell-and-tube heat exchangers.

The company highlights strong in-house engineering, welding and metallurgy capabilities and manufactures heavy equipment for sectors including oil and gas, petrochemicals and fertilizers.

Best suited for: Large industrial shell-and-tube heat exchangers and heavy process equipment.

7. Steelcon Engineering LLP – Gujarat

Steelcon Engineering specializes in process equipment for chemical, pharmaceutical, petrochemical and related industries.

The company is notable for fabrication involving high-alloy materials and internationally recognized engineering codes.

Kompass lists Steelcon among India’s prominent heat-exchanger manufacturers and references ASME, TEMA, PED and AD 2000 capabilities.

Best suited for: Corrosive chemical services and specialist metallurgy.

8. Patels Airtemp (India) Limited – Gujarat

Patels Airtemp manufactures:

• Shell-and-tube heat exchangers
• Air-cooled heat exchangers
• Air-cooled condensers
• Shell-and-fin tube exchangers
• Pressure vessels

The company has been an HTRI member since 1992 and lists ASME U, U2 and S authorizations.

Its shell-and-tube heat-exchanger portfolio includes condensers, evaporators, product coolers, oil coolers, heaters and other process applications.

Best suited for: Refinery, petrochemical, power, fertilizer and air-cooled applications.

9. Precision Equipments Chennai Pvt. Ltd.

Precision Equipments specializes in shell-and-tube and other high-specification process heat exchangers.

The company serves oil and gas, petrochemical, fertilizer, LNG, power and nuclear applications and references ASME, TEMA, EN, PED and API requirements.

Best suited for: High-pressure, LNG and specialized shell-and-tube projects.

10. GMM Pfaudler Limited

GMM Pfaudler provides corrosion-resistant process technologies and heavy fabricated equipment.

Its alloy heat-exchanger portfolio includes:

• Shell-and-tube exchangers
• Bayonet exchangers
• Double-pipe exchangers
• U-tube exchangers
• Coolers
• Condensers
• Reboilers
• Vaporizers

The company works with materials including stainless steel, Hastelloy, titanium, zirconium and tantalum.

Best suited for: Specialty chemicals and highly corrosive process conditions.

11. HRS Process Systems Limited

HRS Process Systems manufactures several heat-transfer technologies including corrugated-tube, shell-and-tube, plate and scraped-surface heat exchangers.

It serves chemical, pharmaceutical, food and beverage, petrochemical, fertilizer, oil and gas and energy-related applications.

Best suited for: Food processing, viscous fluids and specialized process heat-transfer applications.

12. United Heat Exchangers – Coimbatore

United Heat Exchangers manufactures a wide variety of heat-transfer equipment, including:

• Shell-and-tube heat exchangers
• Air-cooled heat exchangers
• Finned-tube exchangers
• Hairpin exchangers
• Reboilers
• Condensers
• Marine exchangers

Its shell-and-tube equipment includes fixed-tubesheet, U-tube, floating-head and kettle-reboiler configurations and references TEMA, ASME and HTRI engineering.

Best suited for: General process, refinery, power and export requirements.

13. United Cooling Systems Pvt. Ltd. – Coimbatore

United Cooling Systems manufactures shell-and-tube, air-cooled, plate, double-pipe and fin-fan heat exchangers.

Its published engineering capability references HTRI, PV Elite and customized industrial equipment.

Best suited for: Industrial process cooling and multi-technology heat-transfer requirements.

14. KRR Heavy Engineering – Chennai

KRR Heavy Engineering manufactures heavy process equipment including engineered shell-and-tube heat exchangers.

Its current information emphasizes thermal sizing, mechanical-design intent, metallurgy selection, nozzle layout and maintenance access planning.

Best suited for: Heavy industrial and project-engineered shell-and-tube exchangers.

15. Uniheat Exchanger – Coimbatore

Uniheat manufactures:

• Shell-and-tube exchangers
• Finned-tube heat exchangers
• Hydraulic oil coolers
• Tube bundles
• Steam radiators
• Stainless-steel condensers

The company states that its equipment is designed, manufactured and tested according to applicable ASME, TEMA and Indian requirements.

For companies specifically looking for an oil cooler manufacturer in India, Uniheat is one supplier worth evaluating alongside more specialized process-equipment companies.

Best suited for: Industrial coolers, oil coolers and general heat-transfer applications.

16. ABE & HEX India Pvt. Ltd.

ABE & HEX India manufactures industrial heat exchangers for heating and cooling applications.

Its current product range includes shell-and-tube heat exchangers for industrial duties.

Best suited for: General industrial and HVAC heat-transfer requirements.

17. SRJ Heatt Exchangers India Pvt. Ltd.

SRJ focuses strongly on plate-and-frame exchanger technology.

The company manufactures plate heat exchangers, plates and gaskets and states that it has more than 17 years of experience in PHE equipment.

Its range includes gasketed, welded, semi-welded, wide-gap and brazed plate exchanger solutions.

Best suited for: HVAC, food, dairy, utilities and plate heat-exchanger applications.

18. Aryan Engineers – Ahmedabad

Aryan Engineers manufactures sanitary shell-and-tube heat exchangers for pharmaceutical, biotechnology and food-processing applications.

Its equipment can use SS316L construction and is designed around sanitary process requirements such as WFI, process water and CIP/SIP systems.

Best suited for: Pharmaceutical, biotech and hygienic applications.

19. RK MechXParts – Vadodara, Gujarat

RK MechXParts offers shell-and-tube, plate, air-cooled and double-pipe heat exchangers for OEMs, EPC contractors and industrial facilities.

Its current heat-exchanger portfolio highlights customization around thermal efficiency, pressure drop, tube layout, metallurgy and process conditions.

Best suited for: Customized industrial and OEM heat-transfer projects.

20. Thermax Limited – Pune

Thermax provides industrial cooling and thermal solutions, including air-cooled heat exchangers and dry-cooling systems.

Its dry-cooling portfolio includes air-cooled exchanger systems covering industrial heat-rejection applications where reduced water consumption is desirable.

Best suited for: Air-cooled thermal systems and industrial dry cooling.

Also, Read: Process Equipment Manufacturers in India

Shell and Tube vs Plate Heat Exchanger

Factor	Shell & Tube Heat Exchanger	Plate Heat Exchanger
Construction	Tube bundle inside shell	Multiple corrugated plates
Footprint	Generally larger	Compact
High Pressure	Excellent when engineered accordingly	Model/design dependent
High Temperature	Widely suitable	Design dependent
Heat Transfer per Area	Moderate to high	Usually high
Mechanical Cleaning	Tube-side cleaning possible	Gasketed plates can be opened
Dirty/Fouling Service	Often easier to engineer	Application dependent
Capacity Expansion	Limited after fabrication	Plates can sometimes be added
Custom Metallurgy	Extensive	Extensive but product dependent
Typical Use	Refineries, chemicals, oil & gas, fertilizer	Food, pharma, HVAC, utilities

When Should You Choose a Shell and Tube Heat Exchanger?

A shell-and-tube exchanger may be a good option where:

• Operating pressure is high
• Operating temperature is high
• Mechanical robustness is important
• The process has demanding metallurgy
• Fouling requires mechanical tube cleaning
• Large heat duty is required
• Project specifications call for a TEMA-type exchanger

When Should You Choose a Plate Heat Exchanger?

A plate exchanger may be attractive where:

• Available space is limited
• Both fluids are relatively clean
• Close temperature approach is required
• High thermal performance per unit area is desired
• Easy capacity adjustment is beneficial
• HVAC, food or utility service is involved

Neither design is universally better.

The correct choice depends on process conditions.

Stainless Steel vs Carbon Steel Heat Exchangers

Factor	Stainless Steel	Carbon Steel
Corrosion Resistance	Generally higher	More limited
Initial Cost	Higher	Lower
Hygienic Service	Common	Less common
Typical Grades	304/304L, 316/316L	Various pressure-equipment grades
Chemical Compatibility	Application specific	Application specific
Maintenance	Often lower in compatible environments	Corrosion protection may be required
Typical Use	Chemical, pharma, food, water	Oil, utilities, compatible process fluids

When Should You Choose Stainless Steel?

A stainless steel heat exchanger manufacturer may recommend stainless steel when:

• Product contamination must be minimized
• Corrosion resistance is required
• Hygienic cleaning is important
• Food or pharmaceutical products are involved
• Process chemistry is incompatible with carbon steel
• Cleanability is important

SS316 and SS316L can provide improved corrosion resistance compared with SS304 in some environments, but stainless steel is not universally corrosion-proof.

Material compatibility must always be checked against the actual fluid, concentration and temperature.

When Should You Choose Carbon Steel?

Carbon steel can be suitable where:

• Process fluids are compatible
• Cost efficiency is important
• Hygienic finish is unnecessary
• High mechanical strength is required
• Corrosion can be controlled

It is also common to combine materials.

For example, an exchanger may have a carbon-steel shell with stainless-steel or specialty-alloy tubes.

Fixed Tubesheet vs U-Tube vs Floating Head Heat Exchangers

Fixed Tubesheet Heat Exchanger

In a fixed-tubesheet exchanger, both tubesheets are rigidly attached to the shell.

Typical advantages include:

• Simple construction
• Lower initial cost
• Fewer mechanical components

Potential limitations include differential thermal expansion and reduced shell-side mechanical-cleaning access.

U-Tube Heat Exchanger

U-tube exchangers use tubes bent into a U shape.

Advantages can include:

• Accommodation of thermal expansion
• Removable bundle in many designs
• Only one stationary tubesheet

The U-bend section can be more difficult to clean mechanically.

Floating Head Heat Exchanger

A floating-head design allows one end of the tube bundle to move independently of the shell.

Advantages include:

• Good thermal-expansion flexibility
• Removable tube bundle
• Access to shell and tube surfaces

The trade-off is higher complexity and typically higher initial fabrication cost.

What Is TEMA in Heat Exchanger Design?

TEMA stands for the Tubular Exchanger Manufacturers Association.

TEMA standards provide widely used mechanical guidance for shell-and-tube heat exchanger design and construction.

Common service classes include:

TEMA C

Generally associated with commercial and general process applications.

TEMA B

Often associated with chemical-process service.

TEMA R

Typically associated with refinery and severe petroleum-related service.

A company being described as a TEMA heat exchanger manufacturer India supplier should not simply mean that it manufactures cylindrical exchangers.

The manufacturer should understand how applicable TEMA requirements affect components such as:

• Shells
• Tubesheets
• Channels
• Tube bundles
• Baffles
• Gaskets
• Allowable clearances
• Maintenance access

The project specification should identify the correct class where applicable.

What Is ASME in Heat Exchanger Manufacturing?

Many industrial shell-and-tube heat exchangers contain fluids under pressure.

Depending on project requirements, pressure-containing equipment may therefore be designed and fabricated according to the ASME Boiler and Pressure Vessel Code.

When a buyer searches for an ASME heat exchanger manufacturer India, important considerations can include:

• Valid authorization for the required scope
• Qualified welding procedures
• Qualified welders
• Material traceability
• Mechanical calculations
• NDT
• Hydrotesting
• Authorized inspection
• Documentation

Do not assume every heat exchanger needs ASME stamping.

The required design code must come from the project specification and applicable regulations.

How to Choose the Right Heat Exchanger Manufacturer in India

Selecting from numerous heat exchanger suppliers in India requires comparing technical capability before comparing price.

1. Define the Required Heat Duty

The manufacturer needs to know how much heat must be transferred.

Useful information includes:

• Hot-fluid inlet temperature
• Hot-fluid outlet temperature
• Cold-fluid inlet temperature
• Required cold-fluid outlet temperature
• Flow rates

The heat duty can then be calculated from the process data.

2. Provide Accurate Fluid Properties

Thermal design can require:

• Density
• Viscosity
• Specific heat
• Thermal conductivity
• Phase
• Composition
• Fouling tendency

Inaccurate process properties can lead to incorrect sizing.

3. Specify Operating and Design Pressure

Provide both:

• Normal operating pressure
• Design pressure

Also define allowable pressure drop on each side.

An exchanger can meet the required heat duty but still create process problems if pressure loss is too high.

4. Define Operating and Design Temperature

Temperature affects:

• Material strength
• Corrosion
• Thermal expansion
• Gasket selection
• Exchanger configuration

Both normal and upset conditions should be considered.

5. Select the Right Heat Exchanger Type

An experienced heat exchanger manufacturer in India should be able to evaluate whether the process is better suited to:

• Shell-and-tube
• Plate-and-frame
• Air-cooled
• Double-pipe
• Finned-tube
• Specialized exchanger technology

The lowest-cost configuration is not necessarily the lowest lifecycle-cost option.

6. Evaluate Thermal Design Capability

A technically capable industrial heat exchanger manufacturer should understand:

• Heat duty
• LMTD
• Overall heat-transfer coefficient
• Fouling factors
• Fluid velocity
• Tube layout
• Baffle arrangement
• Pressure drop
• Flow regime
• Phase change
• Thermal margin

Critical process equipment may also benefit from recognized thermal-analysis software.

7. Evaluate Mechanical Design Capability

Mechanical design should address:

• Shell thickness
• Tubesheet design
• Channels
• Flanges
• Nozzles
• Supports
• External loads
• Thermal expansion
• Differential pressure
• Tube vibration

Good thermal design does not compensate for poor mechanical engineering.

8. Check Material Selection Expertise

Possible materials include:

• Carbon steel
• Stainless steel
• Duplex
• Super duplex
• Copper alloys
• Nickel alloys
• Titanium
• Hastelloy
• Monel

The manufacturer should understand how corrosion, temperature and process chemistry affect material selection.

9. Verify Welding and Fabrication Capability

Evaluate:

• WPS
• PQR
• Welder qualifications
• Tube-to-tubesheet procedures
• Material traceability
• Fit-up controls
• Weld inspection

This is particularly important for a custom heat exchanger manufacturer handling pressure-containing equipment.

10. Review Inspection and Testing

Depending on the project, testing can include:

• Visual inspection
• Dimensional inspection
• Dye penetrant testing
• Magnetic-particle testing
• Ultrasonic testing
• Radiography
• PMI
• Hydrostatic testing
• Pneumatic testing
• Leak testing

Testing requirements should be specified during procurement.

11. Consider Cleaning and Maintenance Requirements

Ask whether:

• The tube bundle can be removed
• Tubes can be mechanically cleaned
• Plates can be accessed
• Tube plugging is possible
• Replacement gaskets are readily available
• Maintenance clearance is available around the equipment

Maintainability should be designed into the exchanger from the start.

Information to Send a Heat Exchanger Manufacturer for a Quotation

Hot-Side Process Data

Provide:

• Fluid name and composition
• Flow rate
• Inlet temperature
• Required outlet temperature
• Operating pressure
• Allowable pressure drop
• Physical properties

Cold-Side Process Data

Provide:

• Cooling/heating medium
• Flow rate
• Inlet temperature
• Required outlet temperature
• Operating pressure
• Allowable pressure drop
• Physical properties

Mechanical Design Requirements

Include:

• Design pressure
• Design temperature
• Material of construction
• Corrosion allowance
• Exchanger orientation
• Design code
• TEMA class where applicable
• Nozzle requirements
• Support requirements

Quality and Inspection Requirements

Specify:

• NDT
• Hydrotesting
• PMI
• Third-party inspection
• Material certificates
• Documentation
• Code stamping where applicable

Providing a complete process datasheet allows different heat exchanger suppliers in India to quote against the same technical basis.

Industries That Use Industrial Heat Exchangers

Oil and Gas

Applications include:

• Gas cooling
• Oil cooling
• Compressor cooling
• Heat recovery
• Condensation
• Process heating

Refineries

Refineries use large heat-exchanger networks for:

• Feed preheating
• Product cooling
• Condensation
• Reboiling
• Heat recovery

Petrochemicals

Petrochemical plants depend heavily on exchanger systems for controlling process temperatures and recovering thermal energy.

Chemical Processing

Common duties include:

• Reactor heating
• Reactor cooling
• Condensation
• Solvent recovery
• Product cooling
• Utility heat transfer

Fertilizers

Fertilizer facilities use exchangers in ammonia, urea and associated process and utility systems.

Pharmaceuticals

Applications can include:

• Purified water
• WFI
• Clean utilities
• Product heating
• Product cooling
• CIP/SIP systems

Food and Beverage

Heat exchangers are used for:

• Pasteurization
• Milk processing
• Beverage heating
• Product cooling
• Heat recovery

Plate and tubular heat exchangers are particularly common.

Power Generation

Applications include:

• Surface condensers
• Feedwater heaters
• Oil coolers
• Closed cooling systems
• Waste-heat recovery

HVAC and Utilities

Plate, shell-and-tube and air-cooled exchanger systems are widely used for:

• Chilled water
• Condenser water
• District cooling
• Refrigeration
• Industrial utilities

Common Heat Exchanger Problems

Fouling

Fouling deposits create an insulating layer on the heat-transfer surface.

This reduces thermal performance and can increase pressure drop.

Scale Formation

Mineral deposits from water can build up inside tubes or channels.

Scale significantly reduces heat transfer when allowed to accumulate.

Corrosion

Incorrect material selection can lead to:

• Pitting
• General corrosion
• Galvanic attack
• Stress-corrosion cracking

Tube Leakage

Tube failure can allow shell-side and tube-side fluids to mix.

This can contaminate process streams and force a shutdown.

Excessive Pressure Drop

Excessive fluid velocity, fouling or poor design can create higher-than-expected pressure loss.

Flow-Induced Vibration

High velocities can cause tubes to vibrate.

Over time, this may cause tube wear or fatigue.

Poor Fluid Distribution

Uneven distribution means some heat-transfer surfaces are underused while others carry excessive flow.

Incorrect Thermal Sizing

An undersized exchanger may never achieve the required outlet temperature even when mechanically sound.

How to Improve Heat Exchanger Efficiency

Heat-exchanger performance can often be improved by:

• Keeping heat-transfer surfaces clean
• Maintaining correct process flow rates
• Monitoring pressure drop
• Controlling fouling
• Repairing leaking tubes
• Maintaining utility temperatures
• Improving flow distribution
• Selecting appropriate materials
• Using heat recovery where practical
• Reviewing exchanger performance after process changes

A major process change should trigger a review of exchanger duty rather than assuming the original equipment remains adequately sized.

Questions to Ask Before Choosing a Heat Exchanger Supplier in India

Before issuing a purchase order, ask potential suppliers:

1. Do you perform thermal design in-house?
2. Which exchanger configuration do you recommend and why?
3. What heat-transfer margin is included?
4. Which fouling factors are being used?
5. What is the calculated pressure drop?
6. Which material is recommended?
7. Which design code applies?
8. Which TEMA class is proposed?
9. What welding procedures will be used?
10. What NDT is included?
11. Is hydrotesting included?
12. Can third-party inspection be arranged?
13. Can the exchanger be manufactured according to our drawings?
14. Can replacement tube bundles or parts be supplied?
15. What documentation is included?
16. What access is required for maintenance?

A technically strong response to these questions is often more valuable than simply receiving the lowest quotation.

Final Thoughts

India has a large and technically diverse base of heat exchanger manufacturers in India, ranging from compact plate-exchanger specialists to manufacturers capable of producing large refinery and petrochemical shell-and-tube equipment.

The most suitable supplier depends on far more than manufacturing capacity.

Industrial buyers should evaluate:

• Thermal engineering
• Mechanical engineering
• Exchanger configuration
• Materials
• Pressure and temperature capability
• Fouling behavior
• Welding quality
• Inspection
• Testing
• Maintainability
• Documentation
• Project experience

When comparing industrial heat exchanger manufacturers in India, use a common process datasheet and technical specification so that every quotation is based on the same design conditions.

For companies seeking a heat exchanger manufacturer India supplier that also provides wider industrial fabrication capabilities, National Engineers & Steel Fabricators is one company worth evaluating.

Established in Surat in 1990, NESF manufactures and fabricates heat-transfer and process equipment alongside pressure vessels, storage equipment, piping skids and custom heavy fabricated assemblies.

Its current process-equipment range includes heat exchanger shells and condensers, making the company particularly relevant where heat-transfer equipment needs to be coordinated with broader plant-fabrication requirements.

Whether the requirement is for a shell and tube heat exchanger manufacturer in India, plate heat exchanger manufacturer in India, air cooled heat exchanger manufacturer in India, stainless steel heat exchanger manufacturer, process heat exchanger manufacturer, condenser manufacturer in India, oil cooler manufacturer in India, custom heat exchanger manufacturer, TEMA heat exchanger manufacturer India supplier or ASME heat exchanger manufacturer India supplier, the final selection should be based on verified engineering capability and suitability for the actual process.

Looking for a Custom Industrial Heat Exchanger?

National Engineers & Steel Fabricators supports custom industrial process-equipment and heat-transfer fabrication requirements from its Surat, Gujarat facility.

For a useful technical discussion or quotation, share:

• Heat exchanger type
• Hot and cold fluid details
• Flow rates
• Inlet and outlet temperatures
• Operating pressure
• Design pressure
• Design temperature
• Allowable pressure drop
• Material of construction
• Required design code
• Drawings or process datasheet
• Inspection and testing requirements
• Delivery location

National Engineers & Steel Fabricators
Sachin GIDC, Surat, Gujarat, India

Heat Exchanger Fabrication | Pressure Vessels | Process Equipment | Custom Industrial Fabrication

NESF’s current enquiry process asks buyers to provide equipment type, material of construction, pressure/temperature, specifications or drawings and project requirements so its technical team can review the fabrication scope.

Frequently Asked Questions About Heat Exchanger Manufacturers in India