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FRP Cooling Water
Piping System
Filament-wound GRP/FRP piping for thermal-power once-through and recirculating cooling water service. Smooth bore, zero scaling, immune to seawater chloride and microbial induced corrosion that destroys steel.
DN 15 – 5000
PN 6 – PN 25
50+ yr Service Life
HW C = 150
−40 °C – 90 °C
REF · Vung Ang2 Thermal PP · DN 3700 GRP CW Pipe · On-Site Installation · DOOSAN VINA / VAPCO · 2022
// Cooling Water System Configurations
Two Cooling Cycles · One FRP Solution
Whether your plant runs once-through seawater cooling or a closed-loop with a wet cooling tower, Leeho FRP/GRP piping is engineered for both regimes.
Once-through Seawater Cooling
Used in coastal thermal plants. Seawater is pumped through FRP supply lines, picks up condenser heat, then discharged via FRP return to the outfall. FRP eliminates seawater chloride corrosion that consumes carbon steel within 3–5 years.
Recirculating with Cooling Tower
Inland gas, biomass, and combined-cycle plants. FRP pipes carry hot CW from the condenser up to the cooling tower distribution headers, then cold return back to the pump. FRP smooth bore reduces head loss and eliminates rust accumulation.
// Wall Construction
Engineered Layered FRP Wall
Multi-layer Laminate
Each Leeho GRP cooling water pipe is built up in three engineered zones: chemical barrier, structural laminate, and external weather coat, each tuned for its specific job.
① Inner Liner: Surface Veil + Chemical Barrier
C-glass surface veil + 2.5–4.5 mm hand-laid vinyl ester liner. 100% resin-rich. The wetted surface in contact with cooling water: corrosion-immune for 50+ years.
② Structural Laminate: Filament Winding
Multi-angle filament-wound E-CR glass roving in iso-polyester or vinyl ester resin. Provides hoop & axial strength, calculated to ASTM D2992 / D2996 long-term hydrostatic pressure rating.
③ External Coat: UV-resistant Top Coat
Pigmented top coat with UV stabilizer for above-ground exposure. Optional fire-retardant or conductive layer per project spec. Color-coded for plant identification.
// Cooling Water Line Components
Complete Pipe Spool Package
Pipe, fittings, flanges, and joining hardware, all from one supplier, one shop, one resin system.
01 PIPE
Straight Pipe
Filament-wound straight pipe sections. Site joints by overlay-lamination per LSM-STD-010; flange connections at equipment tie-ins.
Max length10 m
JointLamination / Flange
02 ELBOW
Elbow / Bend
Mitered or molded elbows, 22.5° / 30° / 45° / 60° / 90°.
Angleup to 90°
03 REDUCER
Reducer
Concentric and eccentric reducers, hand-laid for any pipe size.
StyleCONC / ECC
04 TEE
Tee
Equal & reducing tees with reinforced saddle for branch sizes ≥ DN 150.
TypeEQ / RED
05 FLANGE
Flange
Van-stone & drilled flat-face flanges, drilled to ASME B16.5, ISO 7005, JIS B2220.
StdASME / ISO / JIS
06 JOINT
Lamination Joint
Butt-and-strap overlay-lamination per LSM-STD-010 ITP. 100% witnessed inspection: width, thickness, Barcol.
StdLSM-STD-010
// Hydraulic & Lifecycle Advantages
Why GRP Beats Steel for CW
Numbers from real plant operating data.
150 HW
Hazen-Williams Coefficient
FRP smooth bore stays at C = 150 for the entire service life. Carbon steel starts at 120 and degrades to 80–90 within 10 years from corrosion buildup. Lower pumping head = lower OPEX.
50+ yr
Design Service Life
ASTM D2992-tested long-term hydrostatic strength of FRP gives a 50-year regression slope. Steel CW pipes typically need replacement after 15–25 years from internal pitting and external corrosion.
75% ↓
Weight vs Carbon Steel
FRP density 1.8 g/cc vs steel 7.85 g/cc, about a quarter of the weight. Smaller cranes, simpler supports, faster site installation, lighter pipe-rack steelwork, lower foundation cost.
// Engineering Data
CW Line Specification
| Parameter | Range / Value | Standard |
|---|---|---|
| Diameter | DN 15 – DN 5000 (Ø 0.015 – 5.0 m) | ISO 14692 / AWWA C950 |
| Pressure Class | PN 6 / PN 10 / PN 16 / PN 20 / PN 25 | ASTM D2992 |
| Stiffness Class | SN 2500 / 5000 / 10000 N/m² | ASTM D2412 |
| Operating Temp | −40 °C to +90 °C continuous | – |
| Resin (CW Line) | Iso-polyester (default), Vinyl ester (chlorinated) | ASTM C582 |
| Reinforcement | E-CR glass roving, C-glass surface veil | – |
| Joint System | Butt-and-strap Lamination (LSM-STD-010 ITP) | ASTM C582 / BS 4994 |
| Hydraulic Coefficient | HW C = 150 (constant for life) | AWWA |
| Manufacture | Continuous & discontinuous filament winding | – |
| Length per joint | 6 m (standard) / 12 m (project) | – |
| QC Tests | Hydro 1.5×PN, Barcol, Visual, UV-cure | ASTM D3517 |
| Warranty | 10 years against material & manufacture | – |
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