API 15LR GRE Pipes | Low-Pressure GRP Line Pipe DN50–2000 – CNPS
Low-Pressure GRP Line Pipe Designed to API 15LR
DN50–DN2000 line pipe rated 0–6.9 MPa — corrosion-resistant, lightweight and scale/wax-free for oilfield, chemical, municipal and water-conservancy networks.
Product Overview
API 15LR line pipe is low-pressure GRP piping manufactured by winding: glass fiber as reinforcement with a thermosetting resin matrix — unsaturated polyester resin (UPR) or epoxy — as the base material. The design basis follows API Spec 15LR-2001 (Specification for Low Pressure Fiberglass Line Pipe and Fittings), with reference to SY/T 6266-2004 and JC/T 552-2011.
The production scope covers diameters from DN50 to DN2000 at pressure ratings of 0 to 6.9 MPa, and the line can be designed and produced according to customer demands. Like the wider glass-fiber family, it delivers corrosion resistance, long service life, light weight and a bore that does not readily scale or wax.
Why Choose API 15LR GRE Pipes?
- Large-diameter water, brine and utility lines corrode and scale in steel
- Heavy steel pipe in large diameters is costly to transport and install
- Municipal and water-conservancy projects need long-life, low-maintenance networks
CNPS Solution: Large-diameter low-pressure GRP line pipe designed to API Spec 15LR-2001 — corrosion-resistant, lightweight and scale/wax-free, produced to customer-specific diameter and rating.
- DN50 – DN2000 covers distribution and conveyance networks
- Pressure ratings 0 – 6.9 MPa matched to low-pressure service
- Corrosion resistance and long service life
- No easy scaling or waxing keeps flow stable
- Light weight simplifies logistics and installation
- Designs and production tailored to customer demands
- Diameters: DN50 – DN2000
- Pressure rating: 0 – 6.9 MPa
- Resin systems: unsaturated polyester resin (UPR) or epoxy resin
- Manufacture: filament winding (glass fiber + thermosetting resin)
- Design basis: API Spec 15LR-2001; SY/T 6266-2004; JC/T 552-2011
- Custom designs and production per customer demands
- Large-diameter coverage — DN50 to DN2000 for distribution and conveyance duty.
- Low-pressure economics — Rated 0–6.9 MPa, matching the cost profile of municipal and utility networks.
- Corrosion resistance — Glass-fiber/thermosetting-resin construction resists corrosive media without coatings.
- Long service life — Designed for decades of low-maintenance operation.
- Light weight — Easier transport, rigging and installation than steel of the same diameter.
- Scale/wax-free bore — Stable flow with less cleaning and intervention.
Technical Specifications
| Item | Specification |
| Material / Structure | Unsaturated polyester resin (UPR) or epoxy resin |
| Diameter / Size Range | DN50 – DN2000 |
| Pressure Rating | 0 – 6.9 MPa |
| Design Standard | API Spec 15LR-2001; SY/T 6266-2004; JC/T 552-2011 (per catalog 'Product Standards') |
⚙️Applications
- Oil fields
- Chemical industry
- Municipal networks
- Water conservancy
🔧Installation / Connection
- Lightweight spools and fittings simplify handling without heavy equipment
- Jointing method and end fittings selected per line service — Confirm by model for the specific diameter and rating
- No coatings or cathodic protection required in corrosive service
- Scale/wax-free bore reduces cleaning and maintenance stops
🎨Customization
- Diameter and pressure rating designed to customer demands
- Resin system (UPR or epoxy) selected for media compatibility
- Wall thickness and reinforcement designed per line conditions — reference values To be provided from data sheets
- Custom production runs supported
💎Why CNPS
- Solution engineering — we size large-diameter GRP networks around your pressure, media and installation plan
- Portfolio breadth — low-pressure GRP complements our FRP, GRE and RTP lines
- Design-basis transparency — ratings presented against API Spec 15LR-2001
- Custom scope — non-standard diameters and ratings produced to customer demands
Frequently Asked Questions
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