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FRP/GRP STACKS
FRP/GRP STACKS (CHIMNEYS & EXHAUST STACKS)
FRP/GRP Stacks are engineered exhaust structures designed to safely convey corrosive gases, industrial fumes and process vapors into the atmosphere while maintaining long-term structural integrity. Unlike steel chimneys that deteriorate under acidic condensates, high humidity and corrosive industrial emissions, FRP/GRP stacks provide a non-metallic, corrosion-resistant and maintenance-friendly solution for modern industries.
SREX Composites designs and manufactures FRP stacks, GRP stacks, FRP chimney stacks, GRP chimney stacks, and fibreglass chimney stacks tailored for chemical plants, power plants, fertilizer units, process industries, scrubber discharge points and thermal exhaust systems.
Our stacks offer excellent handling of corrosive gases, temperature variations and continuous outdoor exposure—ensuring reliable emission management with a long operational lifecycle.
Why FRP/GRP Material for Stacks?
✔ Corrosion Resistance
FRP/GRP composites resist condensates containing:
- Chlorides
- Sulphuric acid mist
- Nitric fumes
- Fertilizer vapors
- Chemical exhaust and process gases
This makes them superior to steel chimneys that require heavy coatings and frequent maintenance.
✔ Lightweight & High Strength
The composite structure ensures:
- Easy installation
- Reduced foundation loads
- Higher wind load resistance
✔ Thermal Stability
Designed with resin systems that tolerate the thermal gradients typical in:
- Wet scrubbing discharge
- Industrial ventilation gases
- Medium-temperature flue gas applications
✔ Long Service Life
Non-metallic, corrosion-proof behavior ensures multi-decade performance.
✔ Smooth Internal Surface
Promotes:
- Low flow resistance
- Reduced deposition
- Improved fume evacuation efficiency
✔ Maintenance Friendly
Unlike steel stacks that corrode from inside and outside, FRP/GRP stacks need minimal inspection and no repainting.
Applications of FRP/GRP Stacks
FRP/GRP stacks are widely used in:
Industrial & Chemical Plants
- Chemical process exhaust
- Scrubber discharge stacks
- Vent gas stacks
- Fertilizer plant chimneys
Power & Energy Sector
- Cooling tower exhaust
- Thermal power auxiliary stacks
Water & Wastewater Sector
- Gas venting from treatment units
- Odor control system exhaust
Metallurgical & Mining
- Acid plant exhaust handling
- Vapors from leaching units
HVAC & Ventilation
- Industrial building exhaust
- FRP fan stack assemblies
FRP Fan Stacks
SREX Composites manufactures FRP fan stacks designed to improve the efficiency of cooling towers and induced draft ventilation units. These stacks are engineered for aerodynamic flow, corrosion resistance and lightweight installation, contributing to reduced energy consumption and improved air throughput.
Design & Engineering Features
Structural Design
Stacks are engineered considering:
- Wind loads
- Seismic requirements
- Temperature gradients
- Vibration damping
Material Selection
Depending on service:
- Isophthalic resin
- Bisphenol resin
- Vinyl ester resin
- Fire-retardant resin (special applications)
Construction Types
- Segmented assembly (for large heights)
- Monolithic molded segments
- Integrated base flange system
- Optional thermoplastic liners for extreme corrosive media
Accessories & Options
- FRP access platforms
- Lightning arrestor brackets
- FRP ladders, cages & maintenance platforms
- Inspection ports
- Gas sampling points
Advantages of FRP/GRP Stacks
- Non-corrosive internal and external surfaces
- Lightweight installation reduces crane requirements
- High wind stability
- Longer lifespan compared to steel stacks
- No painting or coating required
- UV-resistant external finish
- Customizable diameter, height, thickness and color
Project Capabilities
SREX Composites provides:
- Turnkey FRP/GRP stack solutions
- Engineering design with detailed drawings
- Manufacturing in modular transport-friendly segments
- On-site assembly and lamination
- Fitment with scrubber systems and ducting interfaces
Stacks can be manufactured up to large diameters and heights based on project requirements.
Standards & Compliance
Depending on application, our stacks conform to:
- ASTM standards for FRP structural laminates
- BS 4994 for reinforced plastic equipment
- ASME RTP-1 guidelines (where applicable)
- IS and DIN composite design references
- Industry norms for chimney wind-load design
Quality Assurance
At SREX Composites, quality assurance for FRP/GRP Stacks, Chimneys and Exhaust Systems is focused on ensuring structural safety, corrosion resistance, dimensional accuracy and long-term performance under continuous outdoor exposure and corrosive exhaust conditions.
Raw Material Verification
- Incoming inspection of resin systems, glass reinforcements and additives
- Selection and verification of resin grades suitable for acidic condensates, chemical vapors and elevated temperatures
- Controlled storage of raw materials to maintain consistency and performance
Laminate & Process Control
- Controlled filament winding and hand lay-up processes for stack shells and flanges
- Monitoring of laminate thickness, glass-to-resin ratio and corrosion barrier layers
- Reinforcement of high-stress zones such as base flanges, lifting points and segment joints
- Controlled curing cycles to achieve required mechanical strength and chemical resistance
Dimensional & Visual Inspection
- Verification of stack diameter, height, wall thickness and roundness
- Inspection of flange flatness, bolt hole alignment and segment mating surfaces
- Visual checks for surface finish, laminate uniformity, voids, cracks and delamination
Structural & Functional Validation
- Verification of design parameters related to wind load, seismic conditions and thermal gradients
- Inspection of segmented stack joints and site-laminated connections
- Confirmation of smooth internal surfaces to ensure low flow resistance and efficient fume evacuation
Accessories & Assembly Checks
- Inspection of FRP ladders, platforms, cages and support brackets
- Fit-up checks for access ports, inspection openings and gas sampling points
- Verification of fan stack interfaces and ducting connections
Documentation & Traceability
- Batch-wise manufacturing and inspection records
- Inspection and test reports (ITRs)
- Raw material traceability and laminate build-up documentation
- Quality compliance certificates issued with each dispatch
Through structured quality control procedures and application-focused inspections, SREX Composites ensures that every FRP/GRP stack, chimney and exhaust structure delivers reliable emission handling, long service life and safe operation in corrosive industrial environments.
Get More Details
Have a question about our FRP/GRP products? Need a custom solution or technical recommendation? Fill out the form below, and our engineering team will reach out with precise information tailored to your requirements.
We are here to serve you.
We’re here to support you with reliable FRP/GRP solutions engineered for industrial excellence. Whether you need technical guidance, custom manufacturing, quotations, or project collaboration — our team is ready to assist you.
+91 70431 70434
marketing@srexcomposites.com
Plot No. 27, Shri Hari Industrial Park, Sokhada, Rajkot, Gujarat, India – 360003