Yingnai frp ductwork provides an integrated corrosion-resistant air and exhaust conveyance system for industrial ventilation and pollution-control applications. Straight ducts, elbows, reducers, branches, flanges, dampers and expansion components can be configured as a complete system. Resin selection, duct geometry, reinforcement and support design are customized according to airflow, gas chemistry, temperature and pressure.
| Item | Reference Specification |
| Product Family | FRP Stack, FRP Chimney Liner and FRP Flue Duct |
| Stack Types | Self-supporting, guyed, tower-supported, sleeve-type and multi-flue FRP stacks |
| Geometric Limits | Self-supporting: height<30 m and H/D <10; guyed: height <45 m and H/D <20; tower-supported, sleeve-type and multi-flue: H/D <10 |
| Construction | Corrosion-resistant inner laminate, structural laminate and external protective/weathering layer |
| Resin Options | Vinyl ester, novolac vinyl ester, isophthalic polyester or project-qualified resin |
| Design Temperature | Project-specific; normal, maximum, upset and start-up temperatures shall be specified |
| Gas Chemistry | State moisture, SOx, chlorides, fluorides, acid mist, oxygen, particulate, condensate chemistry and cleaning chemicals |
| Pressure / Vacuum | Project-specific; include fan pressure, draft, transient pressure and blocked-flow/vacuum cases |
| Structural Loads | Dead load, wind, seismic, thermal gradient, internal pressure/vacuum, platform loads, attached duct loads, vibration and erection loads |
| Support Arrangement | Integral base, guy wires, external tower, outer shell or multi-flue support frame depending on stack type |
| Flue Duct Geometry | Circular or rectangular cross-section; diameter/section and span are determined by airflow, velocity, pressure loss and structural support spacing |
| Joint Options | Shop-laminated or field-laminated joints, flanges and expansion joints selected for pressure, temperature and movement |
| Accessories | Platforms, ladders, inspection ports, drains, expansion joints, dampers, spray nozzles, supports, lightning protection and static-control provisions as required |
| Inspection and Testing | Material certification, laminate inspection, Barcol hardness/cure checks, dimensional/alignment inspection, field-joint inspection and leak testing as specified |
| Applicable References | ASTM D3982-21 for contact-molded FRP ducts; ASTM D5364-14(2024) for FRP chimney liners with coal-fired units; project structural, wind, seismic and fire requirements |
| Required Inquiry Data | Gas composition, moisture/condensation, normal and upset temperature, flow rate, pressure/vacuum, diameter, height/length, support type, wind/seismic data, platform loads and site erection constraints |
| Design Limitation | height and H/D values are product-range references, not a substitute for project-specific structural design |
| FRP Stack and Flue Duct Reference Data | ||||
| Product | Height Limit | H/D Limit | Support Arrangement | Engineering Note |
| Self-Supporting FRP Stack | < 30 m | < 10 | Integral base / foundation support | final wind, seismic and buckling design required |
| Guyed FRP Stack | < 45 m | < 20 | Guy-wire stabilized | Guy arrangement, anchors and vibration control are project-specific |
| Tower-Supported FRP Stack | Project-specific | < 10 | External steel or FRP support tower | Support reactions and thermal movement require coordinated design |
| Sleeve-Type FRP Stack | Project-specific | < 10 | FRP stack/liner within an outer supporting shell | Term follows brochure; project configuration should be confirmed |
| Multi-Flue FRP Stack | Project-specific | < 10 | Multiple FRP flues within common support system | Each flue and common support frame require separate load checks |
| FRP Flue Duct Selection Parameters | |
| Item | Reference Specification |
| Product Name | FRP Flue Duct / Corrosive Gas Duct |
| Construction | Corrosion-resistant liner, structural laminate and external protective layer |
| Resin System | Vinyl ester, novolac vinyl ester, isophthalic polyester or project-specified resin |
| Diameter / Cross Section | Circular or rectangular; customized by airflow and pressure-loss calculation |
| Design Pressure / Vacuum | Project-specific; verify positive pressure, vacuum and transient load cases |
| Operating Temperature | Project-specific and resin-dependent; continuous and upset temperatures shall be stated separately |
| Gas Composition | SOx, chlorides, acid mist, wet flue gas, particulate and other process-gas constituents |
| Joint Type | Butt-and-wrap laminated joint, flanged joint or project-specific expansion joint |
| Support System | Steel/FRP saddles, hangers, frames or tower supports with thermal-movement allowance |
| Optional Accessories | Expansion joints, drains, inspection ports, spray nozzles, dampers, supports and grounding provisions |
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