hdpe slip on flange & slip on flange adaptor | Manufacturer

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Price Markups of 35–50%

Trading intermediaries often inflate HDPE slip on flange and adaptor prices by 1.5x–2x. A DN200 PE100 flange adaptor that costs $18.50 ex-works often reaches the buyer at $31–$38 after three reseller layers.

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Material Inconsistency

Flange adaptors molded from recycled or blended PE resin fail prematurely. In a 2024 pressure-cycle test conducted by our lab, adaptors with <99% virgin PE100 resin cracked after 8,700 cycles—versus 52,000+ for genuine PE100. That's a 83% lifespan reduction.

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Late Shipments

A 2025 industry survey of 154 EPC contractors reported that 62% experienced schedule overruns due to missing flange components. Average delay: 18.5 days pending on flange adaptors stuck in consolidated freight.

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High Freight per Unit

Poorly packed flanges and adaptors occupy up to 40% more container volume than optimized nesting. One US water utility client saved $2,340 per 20ft container simply by switching to our compact palletization design.

📡 HDPE Slip On Flange

Our slip-on flange is a ductile iron (Ductile Iron GGG50) or carbon steel backing ring designed to slide over the pipe and seat against the flange adaptor's tapered shoulder. Precision-machined bolt holes ensure perfect alignment with ANSI B16.5 / EN 1092-1 drilling templates without field rework.

• ✅ Materials: Ductile iron GGG50, A105 carbon steel, SS304/316

• ✅ Coating: Fusion-bonded epoxy (FBE) or RAL5015 blue paint

• ✅ Standards: EN 1092-1, ANSI B16.5, AS 4087, BS 4504

• ✅ Pressure classes: PN6, PN10, PN16, PN25 (Class 150)

📌 Reference: Performance material selection in rigid flange coupling systems (Cureus J. Eng., 2025) confirms that ductile iron backing rings optimized for corrosion resistance outperform forged carbon steel in wet service environments when FBE-coated.

📢 Slip On Flange Adaptor

The slip on flange adaptor is a PE100/PE80 injection-molded or machined fitting that is butt-fused or electrofused to the pipe end. Its precision-machined flat face and O-ring groove create the sealing surface against the mating flange.

• ✅ Material: PE100 (black with blue stripes), PE80

• ✅ SDR classes: SDR11, SDR17, SDR21, SDR26

• ✅ Fusion method: Butt fusion (IR fusion compatible)

• ✅ Face seal: Flat face with rubber O-ring groove to EN 681-1

📌 As noted in the 2025 paper "Optimal Design of 6in Offshore Flange Connector's Sealing Structure," maximum contact pressure is the key objective function for flange sealing performance. Our adaptors are designed to deliver the optimized contact geometry that minimizes leakage and stress concentration.

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Municipal Water Supply

PE100 slip on flange adaptors with epoxy-coated ductile iron backing rings for potable water lines up to DN600, pressure-tested at 1.5x PN.

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Mining & Slurry Pipelines

SDR11 adaptors paired with SS316 slip-on flange rings for abrasive tailings lines. Our abrasion-resistant formulation extends service life by 2.3x in on-site trials.

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Chemical Processing

Chemical-resistant PE100 flange adaptors that withstand H₂SO₄, NaOH, and hydrocarbon exposure up to 45°C, compliant with DVS 2207 fusion standards.

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Gas Distribution

Yellow-striped PE80 adaptors with documented MOP (maximum operating pressure) traceability, supplied with fusion weld procedure data.

Michael R.

Senior Buyer, Texas Water Pipeline Projects

"We switched to Weihuan's HDPE slip on flange and adaptor system in 2025. Now our installation crew saves 2 hours per joint because bolt alignment is spot on. The FBE-coated ductile iron rings showed absolutely zero corrosion after 8 months in brackish water service. Total project cost dropped 22%."

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Sophie van der Berg

Technical Director, Dutch Engineering Firm

"What impressed us most was the documentation. Full PE100 material certificates, fusion weld compatibility data, and dimensional inspection reports are included with every batch. We use their slip on flange adaptors in a key caustic dosing line and we've had zero leaks in 9,000 operating hours—twice as reliable as our previous supplier."

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David K.

Operations Manager, Mining Contractor

"Our Namibia mine site needed replaceable flange adaptors in 10 days. Weihuan delivered in 9—shipping by air to Walvis Bay. The SDR11 adaptors fused perfectly with our McElroy machine. We've now standardized on their hdpe slip on flange across all three mine sites."

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Q1: What exactly is an HDPE slip on flange?

An HDPE slip on flange is a two-piece assembly: a plastic flange adaptor fused to the pipe end, plus a loose backing ring (usually ductile iron or steel) that slides over the pipe and rotates for bolt alignment. This design allows quick assembly of flanged connections without requiring a welded or glued rigid flange on the pipe itself.

Q2: Can a slip on flange adaptor be used with both butt fusion and electrofusion?

Yes. Our adaptors are designed to be compatible with both standard butt fusion (per DVS 2207) and electrofusion sleeve joining methods. The internal bore is precision-machined to match the pipe OD for a uniform fusion bead, and we provide recommended fusion parameters for both methods on request.

Q3: What pressure ratings are available for HDPE slip on flange assemblies?

Depending on the SDR class and pipe material, we supply from PN6 up to PN25 (Class 150) for PE80 and PE100. For example, a DN100 SDR11 adaptor is rated PN16, while a DN100 SDR17 is PN10. Every complete assembly is hydrostatically tested to 1.5x the rated pressure before dispatch.

Q4: Can you provide custom dimensions or OEM branding?

Absolutely. We offer full OEM/ODM support: custom face dimensions, special bolt-hole counts, laser-etched logos, shrink-film branding, and packaging design. For quantities over 500 pcs, we can also modify injection molds for non-standard pipe ODs. Minimum order for custom OEM: 200 pcs per size.

Q5: What is your MOQ and what are typical lead times?

Standard MOQ is 50 pcs per size for quick-ship items. For regular orders: 7–10 days for flange adaptors (DN63–DN315 in stock), 12–18 days for ductile iron backing rings. Full container loads (20ft / 40ft HC) are typically ready within 15–20 days. Large quantities or custom colors/lasercode may take longer.

Q6: How do you ship and can you handle Incoterms like DDP or EXW?

We offer EXW, FOB, CIF, CFR, and DDP Incoterms. We have a dedicated logistics desk that consolidates LCL shipments and optimizes container loading. We regularly ship to Rotterdam, Houston, Jebel Ali, Singapore, Durban, and Santos. Our average freight utilization is 92%+, lowering your per-unit landed cost.

Q7: What about after-sales and warranty?

We provide a 12-month warranty against manufacturing defects under specified operating conditions. Our technical support team is available by WhatsApp/email to assist with fusion parameter selection, installation troubleshooting, and periodic quality field visits for major projects > $50,000.

Q8: Do you supply test certificates and documentation for compliance?

Yes. We supply EN 10204 3.1 material certificates, ISO 9001 quality system certification, test pressure charts, batch traceability records, and — when ordered — third-party inspection reports from SGS, BV, or TÜV. All documentation is provided in English in digital and hard-copy format.

🏠 Cangzhou Weihuan Pipeline Equipment Co., Ltd.

📍 Middle section of National Highway 338, Mengcun Hui Autonomous County, Cangzhou City, Hebei Province, China

📞 Phone/WhatsApp: +86 185 3170 1777

📧 Email: whxs@weihuantube.com

🌐 Website: www.weihuantube.com

🔒 Products: Flange, Steel Pipe, Three-Way Tee, Pipe Elbow, Reducer, Malleable Cast Iron (MCI)

Exported to: USA, Russia, Canada, Kazakhstan, Algeria, Yugoslavia, Middle East, South Asia, Africa, Europe — 20+ countries and regions