PTFE Lined Rubber Expansion Joints for Thermal Power Plant Flue Gas Systems

As part of our ongoing commitment to providing advanced vibration isolation and pipeline flexibility solutions, Shanghai Songjiang Vibration Isolator Co., Ltd. recently completed a custom project for a thermal power plant flue gas discharge system in Singapore.

This order included large-diameter rubber expansion joints (DN1800 and DN1400), specially designed with PTFE lining and anti-negative pressure steel reinforcements to meet the demanding conditions of the plant’s exhaust system.

Understanding Flue Gas Systems in Thermal Power Plants

In thermal power plants, flue gas systems play a critical role in transporting the hot exhaust gases produced during coal or fuel combustion to the chimney for emission control.
These systems must withstand:

• High temperatures

• Corrosive gases (SO₂, NOx, and acid vapors)

• Pressure fluctuations and vibration

• Condensation and chemical erosion

Due to these harsh conditions, ordinary rubber joints often fail to deliver long-term performance. That’s where PTFE lined expansion joints come in — combining flexibility, sealing, and chemical resistance in one solution.

Why PTFE Lined Rubber Expansion Joints Are Ideal for Flue Gas Systems

PTFE (Polytetrafluoroethylene), commonly known as Teflon, is one of the most chemically inert materials available.
By applying a PTFE lining inside the rubber joint, the product gains:

• Excellent corrosion resistance against acidic and alkaline gases

• High-temperature endurance suitable for power plant exhaust conditions

• Longer service life compared with unlined rubber joints

• Smooth inner surface, reducing buildup of particles or residue

To further enhance performance under negative pressure or suction conditions, each joint is fitted with anti-collapse steel reinforcement rings embedded inside the rubber body.

Custom Design and Engineering for Singapore Client

For this project, our engineering team worked closely with the client’s technical department to ensure full compliance with their system specifications.
Key highlights include:

• Custom rubber compound with high corrosion resistance

• PTFE lining molded seamlessly to the inner wall

• Reinforced internal steel structure for vacuum resistance

• Flange drilling and coating per the customer’s standard

Every joint underwent strict pressure and vacuum testing before shipment to guarantee reliable sealing and mechanical stability.

Our Experience in Large-Scale Industrial Projects

With over 30 years of manufacturing experience, Shanghai Songjiang has been a trusted supplier of rubber expansion joints, vibration isolators, and air spring dampers for major industrial projects worldwide.
Our products are widely used in:

• Thermal power plants

• Desulfurization and denitrification systems (FGD/DeNOx)

• Petrochemical plants

• HVAC and water treatment facilities

• Marine and offshore installations

We have successfully delivered many large-diameter joints (DN1000–DN3000) for flue gas, cooling water, and exhaust systems — all designed and manufactured in our modern production facilities equipped with automatic rubber mixing, vulcanizing, and CNC machining lines.

Ready for Shipment

The PTFE lined expansion joints for this Singapore project have now passed final inspection and are ready for shipment.
Each product reflects our commitment to precision manufacturing, material excellence, and customer satisfaction.

If you are looking for customized rubber expansion joints capable of withstanding high temperature, corrosion, and vacuum conditions, feel free to contact Shanghai Songjiang Vibration Isolator Co., Ltd. — your reliable partner in industrial pipeline flexibility solutions.