FRP/GRP Mortar Pipe, also referred to as RPM pipe, is a composite pipeline manufactured via the filament winding process. It is composed of an inner liner, structural winding layer, resin‑mortar layer, and external corrosion‑resistant layer. Since its launch, it has been widely adopted worldwide for water and fluid transmission due to its light weight, high strength, high stiffness, and low cost.

By the mid‑1990s, approximately 160,000 kilometers of RPM pipe had been installed in the United States. In Europe, newly laid large‑ and medium‑diameter RPM pipes for water supply and sewage accounted for 30%–50% of total pipeline installations. In Japan, the total installed length exceeded that of steel pipe and concrete pipe combined. In the Middle East, nearly all pipelines for water supply, sewage, and desalinated seawater use RPM pipe.

Product Structure:

The pipe consists of four integrated layers:

Wound layer: High‑strength fiberglass reinforcement layer

Resin‑mortar layer: Core layer for stiffness improvement and cost reduction

External corrosion‑resistant layer: Weather‑resistant and anti‑aging protective layer

Main Specifications:

Nominal Pressure Class: 0.25, 0.6, 1.0, 1.6, 2.5 MPa

Stiffness Class (SN): 2500, 5000, 10000 N/m²

Nominal Diameter: DN25 – DN4000 mm

Length: customizable within 2 m to 12 m

Connection Type: double O‑ring socket‑spigot, flange, butt joint, adhesive socket

Key Indexes: inner surface roughness 0.0084; Barcol hardness > 40

Note: Pipes ≤ DN400 are generally produced without sand filling

Key Properties & Advantages:

1 Light Weight, High Strength & High Stiffness

Density: 1.7–2.1 g/cm³, about 1/5 of steel pipe, 1/4 of cast steel pipe, and 3/4 of prestressed concrete pipe (PCP).

Fiber content reaches 70%, ensuring sufficient strength. The mortar layer is placed in the low‑stress zone, greatly increasing stiffness without reducing pipe strength.

2 Excellent Corrosion Resistance

The inner liner uses a high resin content (up to 80%) fiberglass‑reinforced layer, customizable for different media. It provides reliable corrosion resistance and zero

leakage without additional anti‑corrosion treatment.

3 Superior Hydraulic Performance

Extremely smooth inner surface; roughness coefficient as low as 0.0084; friction factor f = 0.000915, much lower than steel pipe and PCP.

Hydraulic factor C remains stable at 140–150 for long periods.

Head loss is significantly reduced; conveying capacity improves by more than 20%.

Under the same flow rate, a smaller diameter can be used, lowering project investment.

4 Sanitary & Safe

Made from certified unsaturated polyester resin.

Inner surface is smooth, non‑toxic, and meets national drinking water standards.

No scaling, no algae adhesion, safe for drinking water transmission for over 20 years.

5 Good Shock Resistance

6 Wear Resistance

7 Low Temperature Resistance

8 Strong Environmental Adaptability

Suitable for beaches, seabeds, rivers, mountains, marshes, deserts, and plains.

Features fast installation, convenient transportation, and long service life.

Comparsion with Other Pipes:

Service life: 50–70 years (longer than PCCP, PCP, steel pipe, and ductile iron pipe)

Comprehensive cost per meter: lower than PCCP, PCP, steel pipe, and NCIP

Single segment length up to 12 m, fewer joints, faster installation

Joints allow 3° deflection and can be pressure‑tested

No bursting, easy maintenance

No cathodic protection needed

Parameter of PMA Pipe

Applicable Standards:

Executes standard: JC/T 838‑1998

Compatible with GB, JB, HG, DIN, and other international standards.

Supports customized fittings: flanges, tees, reducers, manholes, etc.

Municipal water supply (including drinking water transmission)

Municipal sewage and wastewater disposal

Desalinated seawater transmission

Industrial fluid pipelines (chemical, corrosive media)

Buried drainage and stormwater systems

Long‑distance water conveyance projects

Seawater intake and discharge projects

Coastal and marine engineering pipelines

A 30-year benchmark manufacturer of FRP environmental equipment, integrating R&D, production, sales and service, YAT FRP delivers green, efficient pollution control solutions to global clients across diverse industries.

We offer a full range of FRP products and services, including storage tanks, pipes, desulfurization/purification towers, integrated pumping stations and anti-corrosion projects, ideal for chemical, energy, municipal, pharmaceutical and power sectors. Our FRP products feature light weight, high strength, corrosion resistance and long service life, replacing traditional metal equipment to cut long-term O&M costs significantly.

Housed in a 10,000+ ㎡ modern production base with advanced molding and testing facilities, we implement 20+ strict quality checks to ensure product stability and reliability. With proven expertise, we have partnered with Fortune Global 500 companies, SOEs and listed firms, boasting nationwide project cases to support global market expansion.

Guided by the philosophy of "Integrity-Based, Quality-First, Service-Oriented", we provide end-to-end services from design to after-sales support. Committed to technological innovation, we strive to partner with global counterparts to drive the green transformation of industries.