GRE Pipes | Epoxy Composite Piping Systems (DN80–1600) – CNPS
Epoxy Composite Piping That Eliminates Corrosion — and Most of the Weight
GRE pipe delivers 60–75% lower weight than carbon steel with continuous service from −40 °C to 93.3 °C — supplied as complete ISO 14692-aligned systems.
Product Overview
GRE pipe is filament-wound composite piping — glass fibers in an epoxy matrix — engineered specifically to defeat the three cost drivers of steel piping: corrosion, scaling and weight. With no rust, no under-insulation corrosion and no need for coatings or cathodic protection, GRE removes whole categories of inspection and maintenance work.
The operating envelope covers −40 °C to 93.3 °C continuous service (project-specific derating applies), standard pressure classes from 6 to 32 bar, and diameters from DN80 to DN1600. At 60–75% lighter than carbon steel, GRE cuts structural loads by up to 75% and lets light crews move long spools without heavy cranes.
CNPS supplies GRE as a complete system — pipe, adhesive-bonded sockets, threaded small-bore lines and flanged tie-in spools — with ISO 14692 Parts 1–4 documentation packages including hydrotest records, CoC/CoA and full traceability for straightforward QA closeout.
Why Choose GRE Pipes?
• Steel corrodes in chlorides, CO₂ and H₂S service, requiring coatings, cathodic protection and frequent inspection
• Heavy steel pipe drives up crane time, structural loads and hot-work risk on site
• Scaling and rough bores degrade flow and raise pumping energy over time
• QA closeout on composite projects can stall without proper documentation and traceability
CNPS Solution: Filament-wound GRE pipe with adhesive-bonded, threaded or flanged joints, supplied as an ISO 14692-aligned system with hydrotest records, CoC/CoA and traceability — engineered so corrosion, scaling and weight stop being your problem.
• Up to 75% lower structural loads versus steel
• No coatings, no cathodic protection, no under-insulation corrosion
• Smooth bore (C ≈ 150) stabilizes pumping energy and flow
• Light spools plus bonded/threaded joints cut crane time and hot work
• Pressure classes to 32 bar standard, with high-pressure series to ~50 bar in select ranges
• Documentation packages that simplify QA closeout
• Diameters: DN80 – DN1600
• Standard pressure classes: 6, 10, 16, 20, 25, 32 bar (≈ 87 – 464 psi)
• High-pressure series: up to ~50 bar / 363 psi in select ranges
• Standard lengths: 6 – 12 m
• Jointing: taper-to-taper epoxy-bonded sockets (cure 8–24 h); threaded for small bore; flanged spools for equipment tie-ins
• Design basis: ISO 14692-compliant GRE systems
• Corrosion control — Handles chlorides, CO₂, H₂S, brackish and produced water without coatings — ideal for marine, terminals and chemical duty.
• Real weight savings — 60–75% lighter than carbon steel; structural loads cut by up to 75%.
• Pressure options — Standard classes to 32 bar; high-pressure series available in select ranges up to ~50 bar / 363 psi.
• Rapid install — Light spools plus adhesive-bonded or threaded joints cut crane time and hot work.
• Compliance ready — ISO 14692 Parts 1–4 packages with hydrotest, CoC/CoA and traceability to simplify QA closeout.
• Smooth bore — Hazen-Williams C ≈ 150 stabilizes pumping energy and flow performance.
• Production discipline — ISO-aligned production with in-process OD/ID gauging and statistical process control; standard lengths 6–12 m.
Technical Specifications
| Item | Specification |
| Diameter / Size Range | DN80 – DN1600 |
| Pressure Rating | 6, 10, 16, 20, 25, 32 bar (≈ 87–464 psi); high-pressure series up to ~50 bar / 363 psi in select ranges |
| Operating Temperature | −40 °C to 93.3 °C continuous (typical; apply project-specific derating) |
| Standard Length | 6 – 12 m |
| Connection Type | Taper-to-taper epoxy-bonded sockets with controlled bond gaps; typical cure 8–24 h; small-bore threaded; equipment tie-ins as flanged spools |
| Suitable Medium / Application | Seawater, brackish water, firewater, district cooling, potable/industrial water, produced water, CO₂/H₂S-laden utilities; mild acids/alkalis compatible — strong oxidizers and certain solvents may need alternative resin systems |
⚙️Applications
• Offshore platforms and onshore terminals
• Desalination plants (intake/outfall)
• District cooling networks
• Firewater rings
• Municipal / industrial water
• Mining utilities
🔧Installation / Connection
• Lightweight spools enable rigging with smaller cranes and less equipment
• Primary joints: taper-to-taper epoxy-bonded sockets with controlled bond gaps; typical cure windows 8–24 h
• Small-bore lines can be threaded; equipment tie-ins supplied as flanged spools
• No hot work, no welding — joints made by controlled adhesive bonding
• No coatings or cathodic protection to install or maintain
🎨Customization
• Project-specific pressure derating applied across the full temperature envelope
💎Why CNPS
• Solution engineering — GRE systems sized, rated and documented around your media, temperature and installation constraints
Frequently Asked Questions
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