Indus Industrial Group provides heavy-duty HDPE Flange Adaptors (Stub Ends) supplied as complete engineered assemblies with matching Epoxy-Coated Ductile Iron or Hot-Dip Galvanized Carbon Steel Backing Rings across nominal diameters from DN50 to DN1200 in pressure ratings SDR11 (PN16) and SDR17 (PN10) according to ISO 4427-3 and EN 12201-3. Designed to transition butt-welded HDPE pipelines to flanged ductile iron gate valves, butterfly valves, check valves, pumps, and water meters, each stub end features a precision-machined gasket sealing face with serrated micro-grooves and a reinforced neck shoulder that resists heavy bolt torque tightening.
| Pricing Verification | Commercial Quote on Demand (RFQ) |
| Governing Standards | ISO 4427-3 / EN 12201-3 / DIN 16963 / EN 1092-2 |
| Nominal Diameter Range | DN50 to DN1200 (OD 63mm to 1200mm) |
| Pressure Classes | SDR11 (PN16 Water) / SDR17 (PN10 Water) |
| Stub Material | Virgin PE100 Black Pre-Compounded Compound |
| Backing Ring Material | Ductile Iron GGG50 / Carbon Steel S235JR (EN 1092-2 / ISO 7005) |
| Backing Ring Corrosion Protection | Fusion-Bonded Epoxy (≥250 µm) / Hot-Dip Galvanized (ISO 1461) |
| Drilling Standards | EN 1092-2 PN10, PN16, PN25 / ANSI B16.5 Class 150 |
| Sealing Face Profile | Serrated Machined Concentric Micro-Grooves |
| Companion Fasteners | Supplied with Grade 8.8 Galvanized Studs & Nuts upon request |
| Certification | EN 10204 3.1 Material Test Certificate with Pressure Test |
| Sector & Division | Water & Wastewater (Div 01) |
| Parent Category | HDPE Butt Fusion Fittings |
Transitions to flanged gate and butterfly valves, pump station suction and discharge manifolds, water treatment plant metering chambers, reservoir intake connections, and industrial cooling loop flanged tie-ins across Baghdad, Erbil, Basra, Mosul, and Najaf.
HDPE Flange Adaptors and Stub Ends represent the critical mechanical transition interface connecting flexible polyethylene pipeline strings to rigid metallic valves, pumping manifolds, and municipal water meters across Iraq. Governed by ISO 4427-3, EN 12201-3, and DIN 16963 standards, these stub ends are molded from virgin PE100 resin. The flanged face incorporates precision concentric sealing grooves that grip full-face EPDM elastomeric gaskets, preventing gasket extrusion and guaranteeing leak-tight hydrostatic performance up to 16 Bar water pressure under heavy hydraulic thrust forces.
The companion backing rings are manufactured from high-tensile ductile iron (EN-GJS-450-10) or structural carbon steel (ASTM A105 / S235JR) with hot-dip galvanized or fusion-bonded epoxy protective coatings (minimum 250 microns). Drilled strictly to international flange standards including EN 1092-2 (PN10, PN16, PN25) and ANSI B16.5 Class 150, the backing ring bore features a radius chamfer that seats uniformly against the HDPE stub shoulder, distributing bolt clamping forces evenly without localized stress concentrations.
In severe Iraqi soil environments, where subsoil moisture and high salt concentrations attack metallic infrastructure, the fusion-bonded epoxy coating protects the backing rings against electrochemical corrosion. Staged in our Erbil Heavy Plant Yard, Baghdad Central Logistics Depot, and Basra Port Hub, Indus supplies complete flanged transition packages including high-tensile hot-dip galvanized Grade 8.8 bolts, nuts, and steel-reinforced EPDM gaskets.
HDPE stub ends require cross-pattern torque tightening in incremental steps (30%, 60%, 100%) using a calibrated torque wrench. Because HDPE relaxes slightly under initial compression, a re-torque after 24 hours is recommended. Indus supplies project-specific bolt torque charts with every shipment.
Yes. For sizes up to DN150, PN10 and PN16 drilling patterns are identical. For DN200 and above, Indus supplies dedicated PN10 or PN16 drilled backing rings strictly to EN 1092-2 / ISO 7005-2, ensuring 100% alignment with all municipal valves and meters.
Indus recommends steel-reinforced EPDM full-face or flat-ring gaskets. The internal steel core prevents the gasket from extruding outward under high bolt torque and provides superior sealing under high operating pressures.
