A large diameter FRP pipe is an advanced composite material pipe with a three-dimensional enhanced structure that is made by 3D printing technology and continuous filament winding processes. The pipe has not only the properties of hydraulics and corrosion resistance of plastic pipes but also has the mechanical properties of metal pipes. The products are widely used in fluid transportation fields such as municipal water supply and drainage, marine engineering, and petrochemical.
Process characteristics
large diameter FRP pipe adopts 3D printing technology (material addition manufacturing) to realize continuous and rapid forming of the pipeline by way of layer-by-layer superposition.
Equipment characteristics
Items | Technical index |
specific |
1.7~2.0 |
Circumferential tensile strength |
80~550MPa |
Axial tensile strength |
20~120MPa |
Circumferential bending modulus |
10~32GPa |
Circumferential elongation at rupture |
1.3%~2.0% |
Axial elongation at rupture |
0.4%~1.2% |
Manning coefficient |
0.009 |
Hazen-Williams coefficient |
150 |
Circumferential tensile strength safety facto |
>6.3 times |
Radial deformation |
High stiffness pipe<4%, low stiffness pipe<5% |
Operating temperature range |
-40℃~50℃(Maximum temperature for special pipes is 110℃) |
Coefficient of thermal expansion |
Circumferential 1×10—5/℃, axial2×10—5/℃ |
Specification and Model of the Product
Nominal Diameter DN (mm): 600~4000;
Nominal Pressure PN(MPa) ≤ 3.2;
Nominal Stiffness SN(N/㎡): 2500, 5000, 7500, 10000;
Pipe joint length L(m):3, 6, 9, 10, 12, 18.
(Note: The above-mentioned are standard specifications and may also be made to orders.)
Performance features
GRP pipe has not only the hydraulic properties and corrosion resistance of plastic pipe, but also the mechanical properties of metal pipe.
Basic characteristics
(1) Light weight and high strength
Comparison table of parameters between GRP pipe and steel pipe
Pipe type |
Specifications and models |
Thickness |
weight |
Tensile strength |
Stretch strength |
Ring stiffness |
GRP pipe |
DN 1000 |
19 |
116 |
200~240 |
3800~4560 |
10000 |
Steel pipe |
DN 1000 |
8 |
200 |
480 |
3840 |
8900 |
(2) Excellent hydraulic characteristics
Items |
GRP pipe |
Steel pipe |
Concrete pipe |
Manning coefficient |
0.009 |
0.012 |
0.013 |
Hazen-Williams coefficient |
150 |
120 |
110 |
Inner diameter |
2000 |
2000 |
2000 |
The along-range resistance loss coefficient |
0.002 |
0.002 |
0.002 |
Flow rate |
6.21 |
4.97 |
4.56 |
Daily flow |
53.6 |
42.9 |
39.4 |
Index of flow |
1.00 |
0.80 |
0.74 |
(3) Corrosion preventive
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