GRE Pipe (Glass Reinforced Epoxy): What Buyers Spec Before RFQ
GRE pipe (glass reinforced epoxy pipe) is rigid line pipe made by filament-winding glass fiber in an epoxy resin matrix. Buyers choose it for corrosive oilfield, water-injection, produced-water, industrial or utility service, then confirm pressure-temperature basis, size and joints against the offered drawing.
IFGS sources glass reinforced epoxy line pipe and related tubulars from licensed partner factories in China and worldwide and handles spec confirmation, procurement and pre-shipment QC. IFGS has no factory of its own; it connects buyers to licensed partner factories in China and worldwide. This buyer RFQ guide is for anyone searching gre pipe, gre piping, gre pipes or gfrp pipe who needs a quotable enquiry. Start from the Glass Reinforced Epoxy Pipes category. No API monogram or certification is claimed here.
What the IFGS GRE pipe pages actually publish
The category page asks buyers to “name fluid, design pressure and temperature, OD, joint family, and whether your tender cites API Spec 15HR or 15LR — not spoolable 15S RTP.” The two line-pipe product pages follow the same logic:
- High Pressure Fiberglass Line Pipe is “supplied as a matched pipe-and-joint system.” It asks for fluid composition, operating and design pressure, surge, temperature range, diameter, length and installation.
- Low-Pressure Fiberglass Line Pipe covers water and industrial transfer duties. It names both unsaturated polyester and epoxy as base resins, so ask which resin the offered pipe uses.
Neither page publishes a datasheet; both ask you to request the size-specific rating, dimensions and documents. Catalogue range figures are references to confirm against the offered drawing, and this guide does not repeat them as ratings. For older material-class notes see What is the GRE pipe material specification?
GRE pipe vs GRP/FRP pipe vs lined steel vs RTP
This is a qualitative comparison only. It gives no ratings.
- GRE pipe. Glass fiber in an epoxy matrix. Chosen for corrosive produced water, injection water and chemical service without internal coating, and lighter to handle than steel. The buyer must confirm the pressure-temperature basis, joint system and documents for the exact size offered.
- GRP/FRP pipe. The same filament-wound idea, usually with polyester or vinyl ester resin. It is common in water, utility and industrial transfer. The resin changes the chemical and temperature envelope, so name the resin in your RFQ rather than writing “GRE or equal.”
- Carbon or lined steel. Familiar welding and installer practice, but heavy, and corrosion resistance depends on the liner surviving at welds and field joints. Confirm liner and weld plan.
- RTP. Reinforced thermoplastic pipe is spoolable, reeled and uses end fittings: a different family with its own standards language. Keep it out of a rigid GRE pipe RFQ. The non-metallic pipe selector covers the class choice.
GRE pipe vs GRE tubing
Same material class, different procurement scope. GRE pipe usually means rigid surface line pipe for gathering, injection or transfer. GRE tubing usually means a well or completion-adjacent string. Freeze the family before comparing bids. GRE tubing vs GRE pipe covers the split in detail. Tubular enquiries belong on GRE Tubing or API 15HR GRE Tubing, and slotted or perforated duty belongs on GRE Screens Pipes.
Joint system, fittings and flanges
GRE line pipe is a pipe-and-joint system, so the joint is part of the specification. Name the joint family you expect, or ask the factory to propose one, then read the matching guide:
- Spigot joint buyers guide
- Lamination joint buyers guide
- Cemented joint buyers guide
- Fiberglass coupling types for GRE/FRP pipe
Elbows, tees, reducers and flanges need their own list with sizes, angles and mating flange standard. Use the fiberglass fittings RFQ checklist so the fittings match the pipe family and joint.
API 15HR vs 15LR: which documents to ask for
API Spec 15HR is titled High Pressure Fiberglass Line Pipe, and 15LR covers low-pressure fiberglass line pipe. If your tender cites either, say which one and ask the supplier for the documents that go with the offered size and joint. As the IFGS high-pressure page notes, a reference to the standard is not proof of certification for a particular product. Never call GRE pipe API 15S, because that is spoolable RTP. This page does not claim IFGS conformance, a monogram or any certification. For background see API 15HR vs API 15LR and the API 15HR / 15LR GRE tubing RFQ.
Qualifying GRE pipe manufacturers
A search for gre pipe manufacturers or high pressure gfrp pipe china should end with a document list, not a logo check. Ask every shortlisted factory (IFGS requests this from its partner factory) for:
- A dimensioned drawing and a datasheet for the specific size and joint offered, not a generic brochure.
- The pressure-temperature basis that applies to the offer (fluid, joint, design or test basis).
- Hydrotest and inspection documents, plus any standard edition your project names.
- The joint detail, seals and installation instructions.
- The packing method and delivery destination from the manufacturing site.
For plant QA questions use the fiberglass pipe manufacturers buyer checklist.
RFQ field checklist
- Application and fluid: oilfield gathering, water injection, produced water, industrial or utility, with chemistry notes if known.
- Size basis: say whether you mean nominal diameter or OD, and request dimensions with tolerances on one drawing.
- Operating and design pressure: internal and external, surge conditions, design or test basis, and units.
- Temperature: operating and design, with units.
- Joint type: preferred joint family, or ask the factory to propose one, with seal and installation notes.
- Fittings and flanges: a list with sizes, angles and mating flange standard.
- Installation: buried or above-ground, supports, external loading, thrust restraint.
- Length and quantity: total route length, piece length if fixed, spares.
- Destination and delivery window. Shipped from the licensed partner factory selected for your order.
- Documents required: drawing, datasheet, joint information, test and inspection records. Name any API Spec your end user cites.
If size basis, pressure-temperature conditions or joint type is blank, quotes will not line up. Partial information is enough to start: mark unknowns “Not sure yet” and ask the factory to confirm.
How IFGS works on this order
IFGS is a sourcing and QC partner: it connects buyers to licensed partner factories in China and worldwide and handles spec confirmation, procurement and pre-shipment QC. Set the pipe family, service and joint here, then confirm documents against the drawing. IFGS has no factory of its own and does not claim a monogram, and we quote no rating the catalog does not print as a confirmed datasheet. Browse IFGS products.
Next step
Contact us / request a quote
· Ask IFGS AI
· High Pressure Fiberglass Line Pipe
· Low-Pressure Fiberglass Line Pipe
FAQ
Is GRE pipe the same as GRP or FRP pipe?
They belong to the same composite family but use different resins. GRE means glass reinforced epoxy. GRP/FRP pipe often uses polyester or vinyl ester. If your tender says “GRE,” ask for the resin system on the datasheet.
GRE pipe vs GRE tubing: which do I need?
Surface line (gathering, injection, transfer) is GRE pipe; a well or completion string is GRE tubing. See GRE tubing vs GRE pipe.
Which API spec do I ask for?
Whatever your end user’s tender cites, usually API Spec 15HR or 15LR for GRE line pipe. Never 15S. Ask for the documents for the offered size and joint, and do not treat a standard number as a rating.
What do I send for a quote?
Send the checklist above: fluid, size basis, pressure, temperature, joint type, fittings, installation, length, quantity, destination and documents. Contact sales or start with IFGS AI.