Performance materials

Full name: Fiberglass Reinforced Plastic (FRP/GRP), commonly known as fiberglass reinforced plastic.

Reinforcement material: alkali free glass fiber (E-glass fiber), providing strength and stiffness.

Matrix resin:

• Universal: Unsaturated polyester resin (resistant to weak acids and water).

• Corrosion resistance: Vinyl ester resin (resistant to strong acids and solvents).

• High strength/alkali resistance: epoxy resin.

• Food grade: Non toxic resin (specifically designed for water supply).

• Filling material: Quartz sand (with sand pipes to increase rigidity and reduce costs).

core performance

• Lightweight and High Strength: Weighing 1/4 of steel pipe, with strength close to carbon steel.

• Ultimate anti-corrosion: resistant to acid, alkali, salt, sewage, seawater, oil and gas, with a lifespan of over 50 years.

• Excellent hydraulic performance: Smooth inner wall (n=0.0084), no scaling, low conveying energy consumption [__LINK_ICON].

• Temperature adaptation: -70 ℃~110 ℃ (special can reach 200 ℃) [__LINK_ICON].

• Insulation non-toxic: no electrochemical corrosion, can be used for direct drinking water.

Standard specifications: Domestic standards

• GB/T 21238-2016 "Glass Fiber Reinforced Plastic Sand Pipe".

• HG/T 21633-2024 "Selection Regulations for Fiberglass Steel Pipes and fittings".

• GB/T 29165.2-2022 "Petroleum and natural gas industries - Glass fiber reinforced plastic pipes".

Specifications

• Nominal diameter: DN25-DN4000mm.

• Pressure rating: PN0.1-PN3.2MPa.

• Ring stiffness: SN1250/SN2500/SN5000/SN10000 (N/㎡).

• Standard length: 6m, 12m (customizable).

Process description (mainstream: computer-controlled winding)

1. Inner lining layer (anti-corrosion and anti-seepage): surface felt+knitted felt+rich resin (≥ 2mm), resin content ≥ 70%.

2. Structural layer (load-bearing): alkali free fiberglass roving+resin (sand filled tube with quartz sand), wrapped at 45 ° -90 ° to provide circumferential/axial strength.

3. Outer protective layer (weather resistant): Rich resin+UV resistant agent, anti-aging and outdoor resistance.

Molding process: Core mold preparation → fiber impregnation → winding molding → heating and curing → demolding → cutting/polishing → testing → finished product.

Structural description (three-layer composite)

• Inner lining layer: 2-3mm thick, rich in resin, smooth inner wall, resistant to medium penetration and corrosion.

• Structural layer: thick (determined by pressure/stiffness), fiberglass+resin+quartz sand, core load-bearing layer, resistant to internal/external pressure/bending.

• Outer protective layer: 0.5-1mm thick, rich in resin, resistant to ultraviolet radiation, soil corrosion, and mechanical damage.

Application scenarios

• Municipal engineering: water supply and drainage, rainwater and sewage diversion, pipe network renovation, and pipe jacking engineering.

• Chemical/Energy: Acid alkali salt media, chemical wastewater, oil and gas gathering and transportation, power plant circulating water/desulfurization pipes.

• Water conservancy/environmental protection: long-distance water diversion, seawater desalination, sewage treatment, irrigation pipeline network.

• Power/Communication: Cable protection pipes, circulating water pipes, nuclear power auxiliary pipelines.

• Special scenarios: coastal/saline alkali land, underground pipe galleries, and new energy (photovoltaic/wind power) pipeline networks.

Installation Instructions

connection method

Socket connection (mainstream): Double O-ring, reliable sealing, adaptable to settlement.

Flange connection: used for valve/equipment docking, corrosion-resistant gaskets, symmetrical fastening.

Adhesive: Low pressure small tube, special epoxy adhesive.

Installation key points

1. Foundation: The bottom of the ditch is flat, with a 100mm fine sand cushion layer laid without sharp objects.

2. Lifting: Use a soft sling and do not tie it directly with steel wire rope to prevent damage.

3. Backfilling: Use fine sand within 500mm of the top of the pipe, compact in layers, and prohibit heavy machinery from rolling.

4. Pressure test: 1.5 times the design pressure, holding for 30 minutes without leakage is considered qualified.

scene graph

Municipal underground construction:

Chemical pipeline installation:

Application of sewage treatment plant:

Case engineering

1. Xinjiang Tumushuke Sewage Treatment Plant: DN1200 epoxy fiberglass pipeline, high salt, temperature difference of -30 ℃~40 ℃, stable operation for 18 months.

2. Cangzhou Chemical Industry Park in Hebei Province: DN800 vinyl ester resin pipeline, pH 2-11 fluctuation, no leakage for 3 years, maintenance cost reduced by 70%.

3. Shenyang Chongshan Road Pipe Jacking Project: DN2100/DN1550 sand pipe, non excavation crossing, shortened construction period by 6 times.

4. Northwest 50MW solar thermal power station: 12km fiberglass collection tube, -30 ℃~80 ℃, no leakage for 3 years, maintenance reduced by 62%.