GRP/FRP Pipe
Hebei Yongchang Composite Material Technology Co., Ltd. is an FRP Pipe professional production enterprise based in the Economic Development Zone, Jizhou District, Hengshui City, Hebei Province. The products comply with the series of national standards of many countries, including Chinese standard (GB), American standard (ASME), German standard (DIN), Japanese standard (JIS), etc. The FRP Pipe manufactured by the company have been widely used in chemical engineering, light industry, pharmacy, metallurgy, brewing, electrochemical water supply and drainage, petroleum refining, steel-making, printing and dyeing, transportation and storage, food brewing, fermentation, water treatment, seawater desalination, and other domestic and foreign industries.
Our glass fiber reinforced plastic / FRP pipes are designed and manufactured according to customer requirements, with various sizes and configurations. We can manufacture pipelines of any specification and pressure and can be made into composite pipelines such as PVC/FRP, PP/FRP, PVDF/FRP, etc., according to the conditions of use.
Our designers can calculate the hoop stress, axial stress, and bending Poisson's ratio coefficient of the product according to your available space, chemical fluid requirements, and applicable natural conditions, and then give the product selection, product thickness, and layering.
We have detailed manufacturing process parameters. All of our designed piping meet industry standards, such as ASTM D2996-filament-wound "glass fiber" (glass fiber reinforced thermosetting resin) pipe standard specification for filament wound pipe.
According to user requirements, various standard fiberglass reinforced pipes and fiberglass fittings can be produced according to ISO 7370, ANSI/AWWA C950, AWWA M45, AWWA C590, ISO 10467, BS 5480, ASTM D2996, ASTM D2907.
FRP stands for fiber-reinforced plastics, it’s a term typically used stateside here in North America. GRP is a term that means the same thing. But it’s generally used over in Europe and Asia and stands for glass-reinforced plastic.
4-inch fiberglass pipe in production
While ordering GRP/FRP pipes the following data need to be provided to us:
Pipe Diameter
Design and Operating temperature of the service fluid.
Design, operating, Surge, vacuum, and test pressures.
Live loads in case of buried piping.
Maximum/minimum buried depth and trench Widths.
Details of Soil properties and trench preparation.
The following are the parameters of GRP/FRP Sand Pipe, if you need other detailed parameters, please contact us!
| Medium range | Drinking water, sewage, seawater, and various chemical wastewater; |
| Pipe inner diameter | 300mm～2600mm in diameter; |
| Pipe length | Usually 12 meters per strip; |
| Pipeline pressure | 0.25mpa～1.6mpa; |
| Pipe stiffness | 2500N/m2~10000N/m2; |
| Connection method | Socket connection; |
| Appearance color | Translucent light green; |
| Safety accessories | Double O-shaped sealing rubber ring; |
Typical mechanical properties of the GRP/FRP piping system are provided in the table below:
| Mechanical Properties of GRP/FRP Pipe | Typical Range |
| Tensile Strength | 14 to 550 Mpa |
| Tensile Modulus | 3.5 to 34.5 Gpa |
| Flexural Strength | 28-480 Mpa |
| Flexural Modulus | 6.9 to 34.5 Gpa |
| Poisson’s Ratio | 0.3 |
| Thermal Co-efficient | 14 to 54 mm/mm/0C |
| Specific gravity | 1.2 to 2.3 |
| Compressive Strength | 69-275 Mpa |
Frequently used Codes and Standards that govern the GRP/FRP piping details are
ISO 7370
ANSI/AWWA C950
AWWA M45
ISO 14692
AWWA C590
ISO 10467
BS 5480
ISO 10639
ASTM D2996, ASTM D2997, ASTM D5421, ASTM D4024, ASTM D5685
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GRP/FRP pipe, also called fiberglass reinforced pipe, is a light, high-strength, and corrosion-resistant non-metallic pipe. It is to wind the glass fiber with resin matrix on the rotating core mold layer by layer according to the process requirements. The fiberglass reinforced pipe wall structure is reasonable and advanced, which can give full play to the chemical resistance, lightweight, and high strength of the material. Under the premise of meeting the strength of use, it improves the rigidity and ensures the stability and reliability of the product. With its excellent chemical resistance, lightweight, high strength, non-scaling, strong shock resistance, long service life compared with ordinary steel pipes and cast iron piping, low overall cost, fast installation, safe, and reliability, it is accepted by users. The application fields of fiberglass reinforced pipe involve industries such as petroleum, chemical industry, and sample water.
Related article: Introducing GRP/FRP Pipe, How FRP Pipe is Constructed?
(1) Corrosion Resistance
Most GRP/FRP pipe selection resins, glass fiber reinforced materials, and composite structures are suitable for chemical applications to provide consistent corrosion resistance. There are still some extreme chemical services, special structures, and alternative resins that should be considered.
The conveying medium can select the chemically inert material, excellent corrosion resistance, and different corrosion-resistant pipelines. The conventional thickness of the corrosion-resistant layer is 5mm. The resin content is greater than 90%, which mainly plays the role of anti-corrosion and anti-leakage. The choice of resin is based on the use of different types of resin. Resistant to acid, alkali, salt, seawater, untreated sewage, corrosive soil or groundwater, and many chemical fluids
(2) High Mechanical Strength and Strong Designability
The internal pressure resistance, external pressure resistance, and impact resistance are all good, and pipes and fittings can be designed and manufactured according to the required pressure. The anti-corrosion layer can improve the use effect of GRP/FRP piping under various conditions by adding wear-resistant materials, anti-static materials, and flame-retardant materials.
①The winding angle during winding can be designed so that the fiberglass steel pipe has different longitudinal/circular strength distribution;
②The wall thickness of the FRP pipe can be designed so that the FRP pipe can withstand different internal and external pressures;
③The materials can be designed to achieve different corrosion resistance, flame retardancy, dielectric purposes, etc.;
④The head-end method can be designed to adapt to different installation conditions to increase the speed of engineering installation.
(3) Strong Temperature Adaptability
Operating temperature range: greater than -70 degrees Celsius and less than 180 degrees Celsius, it can be used normally, and the pipeline will not crack under freezing media.
(4) Small Fluid Resistance
The inner surface of the FRP pipeline is very smooth, the roughness coefficient is small, and the water conservancy coefficient C can be kept in the range of 145-150 for a long time. After testing, the water friction loss coefficient f is 0.000915, which can significantly reduce the fluid pressure loss along the way and improve transportation. Ability is above 20%. Reduce flow resistance, increase flow rate, and reduce energy consumption. Using smaller diameter pipes to transport fluids of the same flow rate can increase the flow rate by about 10% compared with steel pipes of the same specification; it does not scale and reduces the flow rate after long-term use. The protection of cables in the environment of interference and heavy corrosion has a good effect;
(5) Lightweight and High, Easy to Transport And Install (<20% of steel, 10% of concrete)
The specific gravity of the GRP/FRP pipe is 1.7-1.9. Compared with other material pipes of the same pressure and same diameter, the weight of FRP pipe is about 30% of that of steel pipe, so transportation and installation are very convenient. Each FRP pipe can reach 12m in length, and installation is quick and easy. In addition, it can eliminate the welding, rust prevention, and anti-corrosion treatment required for the installation of steel piping. The weight of the pipe is only 1/4 of the ductile iron pipe of the same specification and length and 1/10 of the cement pipe. It is convenient to transport and unload and is easy to install. FRP pipeline installation technology is mature, convenient, and fast, reducing pipeline joints, accelerating installation speed, and improving the quality of the entire pipeline
(6) Maintain Water Quality
The material is non-toxic. The glass fiber reinforced plastic pipe is made of resin as the matrix and glass fiber as the reinforcing material through a special process to ensure that it is hygienic and non-toxic, the inner wall is smooth and does not accumulate, does not breed microorganisms, ensures the quality of the fluid, and does not affect water and other The medium produces secondary pollution and transports drinking water, which can maintain long-term water quality and sanitation. The water-conveying glass fiber-reinforced plastic pipes are made of food-grade resin, and various testing indicators have reached international standards.
(7) Very Versatile and Good Weather Resistance
GRP/FRP pipes have good weather resistance and are suitable for harsh environments such as deserts and saline-alkali;
(8) Material Selection
Resin selection: base resin made of epoxy vinyl resin and phenolic vinyl resin. The fiber is non-alkali fiber or ECR fiber. Meet various anti-corrosion requirements.
(9) Life
The service life of GRP/FRP pipes can reach 50 years or more, which reduces a lot of maintenance costs.
(10) Color
The exterior color of GRP/FRP pipes can be made into various colors according to user requirements. The exterior color can be changed by spraying gel coat resin to meet various use environments, and the exterior is neat, beautiful, and obvious in color.
Related article: FRP: Manufacturing and Advantages
1. Excellent weight strength (stronger than steel based on the same weight)
The excellent toughness of glass steel pipe makes it resistant to resin cracking and cracking when subjected to large design loads. In addition to high fatigue resistance, this toughness also provides a safety factor for impact damage during transportation and installation.
2. Low friction coefficient (more than 25% higher than steel)
Excellent dimensional stability
3. Low thermal conductivity (saving insulation costs)
Resist the influence of sunlight and other weathering elements. If it is a glass fiber tube, the exterior can be polished and resin-coated or painted under particularly harsh conditions after years of weathering.
4. Long-term maintenance costs are low
Related article: What Are The Benefits Of Using GRP/FRP Pipes?
1. The temperature resistance of GRP/FRP pipes is worse than that of steel pipes
The use temperature of the gas is less than 230 degrees. The use temperature of the liquid is less than 130 degrees. It can be used for a long time at -50 degrees under low-temperature conditions.
2. The negative pressure resistance of FRP pipes is poor, and part of the negative pressure resistance can be compensated by adjusting the production process.
3. The corrosion resistance of FRP pipes is sensitive to some organic matter. The more sensitive media should be made into composite FRP pipes and FRP pipe fittings, such as PVC\FRP, PP\FRP, and PVDF\FRP. The strength of single-material PVC, PP piping, and pipe fittings is much lower than that of FRP pipes. The composite production process can make up for each other's shortcomings.
Have to be aware of is:
FRP pipe is not recommended for carrying fluid with temperatures more than 1000 C.
Slight degradation from UV rays is found to occur which can be reduced by using pigments, dyes, UV stabilizers, fillers, etc in the resin system.
The fiberglass-reinforced pipe is widely used in various industries with its excellent product performance. And played an important role in various industries.
Petroleum, chemical, pharmaceutical, and biogas industries: such as chlor-alkali, potassium sulfate fertilizers, papermaking, and acid regeneration systems.
The water treatment industry includes seawater desalination, industrial wastewater treatment output and input, and pure water systems.
Liquid transportation industry: urban water supply, urban drainage, irrigation system.
Power industry: flue gas flue, desulfurization system, circulating water, cable pipe, glass fiber reinforced plastic chimney.
Environmental protection: sewage odor recovery, workshop waste gas treatment, factory air purification, biogas desulfurization, and purification.
FRP round pipes are used in petroleum, chemical, mining, metal production, power plants, flue gas desulfurization (FGD), pulp and paper mills, and drainage.
If you have any questions about the usage scenarios and fields of FRP fiber pipes, you can contact us, and you will receive expert answers within 24 hours!
(1) FRP desulfurization pipeline
(2) FRP sand pipe
(3) GRP/FRP pressure pipe
(4) GRP/FRP cable protection tube
(5) GRP/FRP water pipeline
(6) GRP/FRP insulation pipe
(8) FRP sewage pipeline
(9) FRP pipe jacking
(10) FRP static conductive tube
If you have a product data request, please contact us to send you the complete product data file!
Flat end docking
This type of joint aligns the end faces of the two pipes and then wraps them with different sizes of reinforcement materials (glass cloth, fel,t or felt plus roving) impregnated with resin to an appropriate thickness and width. The thickness of the interface should be greater than the design thickness of the FRP pipe, and the width is the diameter of the FRP pipe. If conditions permit, the internal joints of the interface must be sealed and plugged. This joint has good sealing performance and can withstand the design pressure of the interface FRP fiberglass pipes. It is usually used to connect FRP straight pipes, FRP elbows, FRP tees and FRP tapered pipes, and other FRP fittings.
Flange connection
The flange connection connects the FRP flange to the FRP pipe, the two flanges are aligned, and the PTFE gasket or rubber gasket is clamped in the middle. The flange is fixed with bolts. The flange can also be loose. This installation method is simple and has little impact on the construction environment. Easy to change accessories.
Socket connection
The sealing ring connection is divided into a single 0-ring connection and a double 0-ring connection. The first two methods are mostly used for fixed connections between pipelines and pipelines while sealing ring connections are mostly used for underground pipelines. The socket glue connection method is suitable for connecting fixed-length pipes (but cannot be used for pipes with corrosion-resistant layers); pipes and pumps are connected because of vibration, and flexible joints are used to reduce the deformation of pipes and pipe fittings. Double O-rings mostly connect FRP sand pipes. Pressure test holes are reserved between the two sealing rings at the pipe socket. When the pipe is installed, one should be installed, and the other should be tested to ensure the joint has No leakage.
FRP pipes can be used with FRP flanges, FRP elbows, FRP tees, FRP deceleration pipes, and various FRP accessories. Connect to form a complete set of FRP piping systems. The products produced by the company have the characteristics of good pressure resistance, high strength, high rigidity, lightweight, long life, corrosion resistance, non-toxic and odorless, and smooth inner surface. With their obvious advantages, they are widely replacing traditional materials. They are widely used in the petroleum and chemical industries. Medicine, food brewing, and other fields, especially in municipal engineering water supply and drainage, sewage treatment, environmental sanitation, and tap water pipe network applications have shown great vitality.
During interface operation, the ambient temperature should not be lower than 10℃; after bonding, the curing temperature should not be lower than 15℃, and the curing and holding time should not be less than 12 hours. Paste the interface according to the ply design. According to the sample data, planned gel time, environmental temperature, etc., mix the resin and stir it fully. When the bonding thickness is greater than 10mm, it should be molded in stages. Before each molding, the cured surface of the last molding should be polished.
After the FRP pipes are combined into an FRP pipe network, the system will vibrate when running. There are also changes in the thermal expansion and contraction of the FRP fiberglass pipes due to environmental influences. Install flexible joints in areas where the FRP pipes are stressed to relieve the system's operating pressure.
FRP fiber pipes are widely used in various environments and various systems. To form a strong FRP pipe network, various FRP fittings are required.
FRP fittings are commonly used:
FRP fixed flange, FRP loop flange
FRP tees with different diameters, FRP tees with the same diameter
FRP reducing pipe
FRP elbow (1D and 1.5D)
FRP flexible joint
Steel backing flanges
Flanged reducers
Reducers (Eccentric and Concentric)
Flanged elbows
Smooth flow-reducing elbow
Special radius bend
Lateral connection
Cross connections
Wye Connections
GRP pipes and FRP pipes (short for GRP and FRP) are used interchangeably in the glass fiber pipe industry. FRP stands for fiber-reinforced plastic, a term commonly used in the United States of America. GRP is a noun with the same meaning. But it is widely used in Europe and Asia and represents fiberglass reinforced plastic.
Related article: Do You Know The Differences Between GRP And FRP?
As FRP Pipes have superior corrosion resistance capabilities and over the long term it is economic, Steel pipes are replaced by FRP pipes.
Steel pipes are isotropic while FRP pipes are anisotropic and the properties changes concerning direction.
FRP pipes are more flexible than Steel pipes due to the lower modulus of elasticity.
FRP piping systems are designed considering a higher factor of safety than steel piping. The usual factor of safety in the design of FRP pipes varies in the range of 5 to 10.
Other major differences between FRP and Steel pipes are provided in the Table below:
| Property | FRP | CS | Remarks |
| Density | 1850 kg/cu.m | 7800 kg/cu.m | Loads on support is less in the case of FRP pipe as compared to Steel. Handling and transportation of FRP are easier than Steel pipes. |
| Co-eff of thermal expansion | 27 X 10-6 mm/mm 0C | 11 X 10-6 mm/mm 0C | Expansion is almost 2.5 times of Carbon Steel Pipe. So more thermal growth in the case of the FRP Piping system. |
| * This value may change from vendor to vendor | |||
| Modulus | Axial= 12000 N/sq.mm | Elastic= 211365 N/sq.mm | Considerable difference in the strength of FRP & CS. Anchor loads are less in FRP Pipes as compared to steel pipes. |
| Shear= 11400 N/sq.mm | |||
| Tensile Strength | 80-135 MPa | 456 MPa | Mechanical Strength is higher for Steel material as compared to FRP. |
| Yield Strength | 70-135 MPa | 227 MPa | The yield strength of FRP is lesser than that of Steel. |
| Allowable Stress | 4,000 PSI to 20,000 PSI | 20,000 PSI | The strength of GRE varies drastically and hence proper vendor data is a must. |
| Corrosion resistance | Superior | Inferior | The corrosion resistance of carbon steel is much lower than that of FRP pipes. |
| Joints | Threaded or glued | Welded | FRP joints are to be checked for higher axial loads and pressure |
The initial cost of FRP pipes is normally higher than the metallic piping systems. But when comparing the total cost over the complete service life FRP Pipes come as a winner due to their long service life.
The main differences between FRP and HDPE pipes are listed in the Table below:
| FRP Pipe | HDPE Pipe |
| FRP is an Orthotropic composite material | HDPE is isotropic material . |
| The cost of FRP pipe is very high | The cost of HDPE pipe is considerably lower than FRP Pipes. |
| Lower thermal expansion co-efficient | The thermal expansion coefficients of HDPE pipes is extensively higher as compared to FRP pipes. |
| FRP pipes have a comparatively higher temperature range than HDPE Pipes | Lowe temperature range |
| Fabrication time is comparatively longer | Quicker fabrication. |
| Strength and Elastic modulus for FRP pipes are higher than HDPE | Lower strength and elastic modulus. |
| Easy installation at site | Costly complex equipment is required for installation. |
| Highly skilled professionals are required for site work of FRP piping systems | HDPE pipe works can be done by semi-skilled operators. |
| Much lighter in weight due to lower all thickness even though the density of FRP is normally higher than HDPE | Heavier due to higher wall thickness. |
| A fire retardant version of FRP pipes can be made. | HDPE pipes are highly flammable |
Yongchang provides long-term corrosion solutions and the absolute longest product life for standard fiberglass pipes, customized pipes, special manifold systems, pipes, or chimneys. Contact us, you can get the advice of our professionals according to the usage scenario!
