Large-diameter water pipeline projects require more than corrosion resistance. Engineers must also consider hydraulic performance, installation efficiency, joint reliability, soil conditions and long-term maintenance costs.

GRP/RPMP pipes provide a corrosion-resistant pipeline solution for municipal water transmission, wastewater collection, stormwater drainage and industrial water systems.

The installation photo shows a large-diameter GRP pipe section being lowered into a prepared trench. Compared with many traditional pipe materials, the relatively low weight of GRP pipe can simplify lifting, transportation and site installation. Final lifting procedures and equipment must still be selected according to the pipe diameter, length, weight and site conditions.

GRP means Glass Reinforced Plastic. RPMP normally refers to a Reinforced Plastic Mortar Pipe, also known as an FRP sand-filled pipe.

A typical GRP/RPMP pipe contains several functional layers:

Each layer performs a different function. The inner layer is selected according to the transported medium, while the structural layers provide the required pressure capacity and ring stiffness.

GRP pipe does not experience the same type of electrochemical corrosion as unprotected steel pipe. This makes it suitable for wastewater, industrial water, seawater, saltwater and other corrosive environments.

The favorable strength-to-weight ratio of GRP pipe can reduce lifting and handling requirements. This is especially valuable for large-diameter pipe sections and projects with long installation routes.

The smooth internal surface helps reduce hydraulic resistance and can support efficient water transmission. The final pipe diameter should be selected according to the required flow rate, pressure loss and pumping conditions.

GRP pipe cannot be selected only by diameter. Pressure class, ring stiffness, joint type, burial depth, traffic load, groundwater level, soil conditions and backfill material must all be evaluated.

Correctly designed GRP pipelines generally require less corrosion-related maintenance than many metallic pipeline systems. This can help reduce long-term inspection, coating repair and replacement requirements.

Large-diameter GRP/RPMP pipes can be designed for:

The material system must be selected according to the transported medium, concentration and operating temperature.

A successful buried GRP pipeline requires appropriate installation conditions.

The engineering team should confirm:

For large-diameter pipes, lifting slings should be arranged to avoid concentrated loads or damage to the pipe surface. Pipe ends, joints and sealing areas should be protected during transportation and installation.

The installation method must follow the approved project design and applicable standards.

Hebei Yingnai manufactures customized GRP/RPMP pipes and related fittings for water transmission, wastewater and industrial pipeline projects.

Our reference product range includes large-diameter pipes with different pressure and stiffness classes. Final diameter, pressure class, ring stiffness, laminate structure and connection method are selected according to the customer’s project requirements.

We can supply:

To receive a suitable GRP pipeline proposal, please provide:

Our team will review the operating and installation conditions before recommending the pipe structure and connection system.