Keld Ellentoft India Fabric Expansion Joints

Keld Ellentoft India Private Limited (KELD) specialises in the design and manufacture of dampers, expansion joints, lamella seals, air slides, and ducting insulation for the power industry.

Fabric expansion joints for the power industry

KELD products feature a broad selection of fabric combinations, including single and multi-layer expansion joints. The joints are capable of withstanding temperatures up to 1,200°C.

Suitable combinations can also be offered to suit internal and external corrosive atmospheres.

KELD also offers expansion joints for special applications, including coal mill, loop seal and chimney seal bellows, as well as metallic expansion joint repair bellows.

The expansion joints are designed to require very little maintenance and simply require the correct installation and supervision in order to operate effectively.

The company has a fully equipped in-house laboratory where it tests fabric for flexibility, permeability and temperature withstandability.

Butterfly dampers for airflow modulation

KELD butterfly dampers are mostly used for airflow isolation, but can also be used for airflow modulation when low-control precision is required.

Rectangular and circular butterfly dampers are available in sizes from 4in to more than 144in

Products are designed and manufactured to efficiently support the service pressure and temperature required by each client.

To ensure the highest resistance to chemical and/or abrasive attack from gases and particles present in the system, material is selected according to application.

Louver damper for modulating applications

For modulating applications that do not require a high-rate of sealing, a louver damper is recommended.

Variations of this system can provide 100% sealing when necessary.

The design of the dampers improves efficiency and the aerodynamic profile of the blades reduces pressure loss. The overlapping of blades ensures the ends are in contact with the frame seat and this reduces leaks when the damper is closed.

Blades are either welded or bolted depending on the client’s requirements.

Guillotine damper to isolate combustion gases

Guillotine dampers provided by KELD are used to isolate combustion gases.

Other types of dampers can be designed for mounting on a rectangular or circular duct, and with metallic or k-flex seals.

They can also have a solid or hollow core blade and electric, pneumatic, hydraulic or manual actuation.

Standard models provide a sealing efficiency of between 98%-99.9%.

Different sealing standards are available, including the use of air barriers when perfect sealing is necessary.

Slide gate damper to control raw material low in material transport systems

KELD slide gate dampers are used to control the flow of raw material in dry material transport systems.

Different applications are carefully studied to determine the size and type of material necessary during the manufacturing process.

It is also possible for KELD to offer dampers that can be adapted to a wide range of materials (abrasion, corrosion, heat and shocks) and fitted for different degrees of sealing.

Commissioning and supervision services

KELD will also study the entire system and recommend solutions for optimised usage of supports, structures and the number of expansion joints / dampers.

The KELD team can help clients from concept to commissioning, by undertaking the supervision of the installation of products. Technical team members are fully trained to study the layout of a system and provide appropriate advice.

KELD studies specific problems arising from associated equipment, allowing the company to offer tailor made solutions. For example, KELD has provided designs for diesel generator applications to withstand the high-pulsation, thermal movements, vibrations and chemical attack. This specific application was considered an area unsuitable for non metallic expansion joints (NMEJ) up until this point.

The company can also undertake retrofitting of damaged or leaking metallic expansion joints (MEJ) on a complete turnkey basis. Damaged metallic bellows can cause serious financial loss in process plants due to loss of energy by the leakage from / to the system.

Many thermal power plants and chemical plants in India have reaped the benefit of retrofitting the damaged MEJ with NMEJ fabric with our turnkey service.

KELD can also undertake the ownership of expansion joints in large process plants, irrespective of the original source, and maintain the same to enable the customer to operate his plant without any outages due to the expansion joints.

A comprehensive service programme can be offered depending upon the number and type of expansion joints in the plant.

About KELD

KELD is a family owned business with more than 30 years of experience in the expansion joint market.

The company has a wide network of marketing partners worldwide, allowing it to offer quick and effective customer service.

KELD has been an ISO 9001:2000-certified company since 2001.

Make an enquiry

Press Release

KELD to Manufacture Gas Seal Panels

As a part of an expansion drive, KELD has diversified into the manufacture of gas seal panels thanks to the support of Flowserve Pte, Singapore.

White Papers

Expansion Joints for Multi-Flue Chimneys in Coal-Fired Power Plants

As the need for more power generation increases, each power station needs to increase its number of plants, resulting in optimised utilisation of space and resources.

Keld Ellentoft India Private Limited

Raheja Complex, 1st Floor

68 (Old # 834) Anna Salai

Chennai 600 002



+91 44 7101 0500 +91 44 4214 3904 +91 44 7101 0501

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Related Projects

Press Release

13 November 2017

In 2016, KELD received its largest single order in its entire history.

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29 October 2016

2016 has been a positive year for KELD in regards to development. The company has opened up an overseas company called Keld Stones LLC, in the US, with its partner Navkar LLC.

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23 December 2015

As a part of an expansion drive, KELD has diversified into the manufacture of gas seal panels thanks to the support of Flowserve Pte, Singapore.

Read more
13 March 2011

It is an honour to be a small part of the recently conducted Commonwealth Games in New Delhi. In record time, Keld Ellentoft India successfully completed the supply and installation of 32 expansion joints for a 1,500MW combined cycle power plant that was set up near New Delhi (through Bharat Heav

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22 February 2011

Keeping with the strategy of diversifying into allied products, Keld Ellentoft India has tied up with a Canadian damper manufacturer, MCM Steel, to design and manufacture all types of industrial dampers in India. This product not only complements Keld's existing product range; it also offers a mo

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7 September 2009

Keld Ellentoft India has secured yet another repeat order for coal-mill bellows from Doosan Babcock. In the year 2000, Doosan Babcock (earlier referred as Mitsui Babcock) selected Keld Ellentoft India as the main vendor for its prestigious Taichung power project in Taiwan. Happy with th

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Regional Offices

Keld Ellentoft India Private Limited

Raheja Complex, 1st Floor

68 (Old # 834) Anna Salai

Chennai 600 002



+91 44 7101 0500 +91 44 4214 3904 +91 44 7101 0501

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