GRP/FRP Pipe Fittings
Hebei Yongchang Composite Material Technology Co., Ltd. is a Chinese professional company 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 products 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.
Let us know if you have any questions, we're happy to be of service to those in the industry!
-The cut & Miter process is highly versatile to make the full range of diameters, standard & special shapes & custom-designed parts. Fabrication of the fittings and specials starts with producing a GRP Pipe that is cut and assembled into the desired configuration.
-The pipes are produced on continuous filament winding equipment with controlled materials to ensure uniform properties and homogeneous material distribution on all sections of the fittings.
-Cut & Mitered fittings are made by cutting pipe sections to the desired form & pieces are joined together with Contact Molding techniques using pre-approved material of chopped strands, woven roving reinforcement & an adequate quantity of Resin.
-The pipe (structure of the fitting unit) design follows AWWA M45 fiberglass pipe design manual. The design life is 50 years.
The Fittings are designed as a corrosion-resistant piping system for conveying water or sewage under pressure or gravity flow in the buried application.
Some uses for the pipe system are sanitary sewers, stormwater, potable water, raw water, Irrigation, Industrial wastes and effluent, seawater transmission, fire protection, and cooling water.
PS: 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.
When the pipeline is pressurized, unbalanced thrust force occurs at bends, reducers, tees, wyes, bulkheads, and other changes in line direction. These forces must be restrained in some manner to prevent joint separation. When the surrounding soil cannot provide this restraint, thrust or stress/thrust block must be used. Determination of the need and design of these restraints is the responsibility of the owner’s engineer subject to the following limitations.
YongChang Fiberglass Pipes. Engineering Dept. can assist in designing the restraint.
The thrust block must limit the displacement of the fittings to 0.5% of the diameter of 6 mm, whichever is less. The block must surround the fitting for its entire length and circumference. It should be placed either against undisturbed earth or backfilled with pipe zone materials appropriate for the native soil characteristics.
These blocks apply to:
All bends, reducers, bulkheads, and blind flanges.
Tees, when the branch pipe is concentric to the header pipe centerline.
Note: It is not necessary to encase the nozzle connection in concrete.
Nozzles are tee branches meeting all the following criteria:
Nozzle diameter ≤ 300 mm.
Header diameter ≥ 3 times nozzle diameter.
Suppose the nozzle is not concentric and not perpendicular to the header pipe axis. In that case, the nozzle diameter shall be considered the longest chord distance on the header pipe wall at the nozzle/pipe inter-section.
Thrust Stress / Blocks:
The thrust/stress block must limit the displacement of the fitting so that the coupling angle notations do not exceed the allowable. They must also restrict the radial deformation of the fitting to 0.5% of the radius of the respective pipe sections.
The block must surround the fitting for its entire length and circumference. It should be placed either against undisturbed earth or backfilled with pipe zone material as appropriate for the native soil characteristics.
These blocks are required for the following fittings when the line is ≥100 kPa (1 bar):
Tees, when the branch pipe is eccentric to the header pipe centerline
Lateral eyes
Bifurcations
Custom fittings as noted by special instructions
Pressure Class:
Pressure series are: PN ( 1,6 ,10,12 ,16,20, 25 , and 32) Bar
Stiffness Class :
The stiffness classes are SN (1250, 2500, 5000, and 10000) N/m².
Diameter Range:
The nominal diameters covered by this specification are :
ND | ND | ND | ND | ND | ND |
300 | 600 | 1100 | 1600 | 2100 | 2600 |
350 | 700 | 1200 | 1700 | 2200 | |
400 | 800 | 1300 | 1800 | 2300 | |
450 | 900 | 1400 | 1900 | 2400 | |
500 | 1000 | 1500 | 2000 | 2500 |
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