AS4087 PN16 316/316L Flanges FOR PE STUB
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AS 4087 Flanges PN16 for PE (Polyethylene) Stub are widely used in plastic pipeline systems — especially for water supply, irrigation, and wastewater applications — where high resistance to corrosion, ease of maintenance, and reliable pressure containment are essential.
The AS 4087 standard specifies dimensions, pressure ratings, materials, and technical delivery conditions for flanges used alongside PE stub ends to enable a strong, flexible, and detachable pipeline connection.
⬇️Download AS-4087 Standard Now (PDF)
AS 4087 specified the metallic flanges for waterworks purposes and installers of flanged components guidance on the most appropriate jointing requirements to achieve a satisfactory long-term watertight joint.
AS4087 is the latest standard for BS table D to H, the same drilling is used but the new PN pressure rating system has been adopted. As the new pressure ratings are slightly higher the flange thicknesses have slightly increased. Also the raised face dimensions (although rarely specified, flat face is mostly used) are slightly larger. Table C, J to R, no longer exist, PN16 is the same drilling as Table D, PN21 is the same as Table E, PN35 is the same as Table H.
AS 4087 Flange Type
AS 4087 PN16 Flanges for PE Stub are typically lap joint or backing flanges designed to match with PE stub ends (butt-fused or electro-fused). This combination lets you connect polyethylene pipe to metal components (such as valves, equipment, or pipeline segments) with ease, while retaining maximum resistance to corrosion and pressure.
AS 4087 Flange Size Range
✅ Nominal Size (DN): DN 20 to DN 1200
✅ Flange Thickness: varies by pressure class and size
✅ Flange Facing: flat face (typically) for proper gasket seating
✅ Flange Drilling: to AS 4087 PN10 or PN16 standard (with standard number of holes, P.C.D, and hole size)
Grade Specifications for 316L Stainless Steel
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
|---|---|---|---|---|---|---|---|
| BS | En | No | Name | ||||
| 316L | S31603 | 316S11 | – | 1.4404 | X2CrNiMo17-12-2 | 2348 | SUS 316L |
AS4087 PN 16 TABLE D BACKING RING
| SDR11 (PN12.5 RATED) WITH AS4087 PN 16 TABLE D BACKING RING | ||||||
| PE End Size | Flange Size | Pressure Rating | Pipe End SDR | Pipe ID Flange End (C) | Flange PCD | Bolt Holes No. x Dia |
| 250mm | 200mm (8″) | PN12.5 | SDR11/13.6 | 198mm | 292mm | 8×18 |
| 315mm | 250mm (10″) | PN12.5 | SDR11/13.6 | 250mm | 356mm | 8×22 |
| 355mm | 300mm (12″) | PN12.5 | SDR11/13.6 | 289mm | 406mm | 12×22 |
| 400mm | 300mm (12″) | PN12.5 | SDR11/13.6 | 289mm | 406mm | 12×22 |
| 400mm | 350mm (14″) | PN12.5 | SDR11/13.6 | 320mm | 470mm | 12×26 |
| 400mm | 375mm (15″) | PN12.5 | SDR11/13.6 | 325mm | 495mm | 12×26 |
| 450mm | 375mm (15″) | PN12.5 | SDR11/13.6 | 340mm | 495mm | 12×26 |
| 450mm | 400mm (16″) | PN12.5 | SDR11/13.6 | 366mm | 521mm | 12×26 |
| 500mm | 450mm (18″) | PN12.5 | SDR11/13.6 | 398mm | 584mm | 12×26 |
| 560mm | 500mm (20″) | PN12.5 | SDR11/13.6 | 455mm | 641mm | 16×26 |
| SDR11 (PN16 RATED) WITH AS4087 B7 CLASS 16 TABLE D BACKING RING | ||||||
| PE End Size | Flange Size | Pressure Rating | Pipe End SDR | Pipe ID Flange End (C) | Flange PCD | Bolt Holes No. x Dia |
| 250mm | 200mm (8″) | PN16 | SDR11 | 183mm | 292mm | 8×18 |
| 315mm | 250mm (10″) | PN16 | SDR11 | 228mm | 356mm | 8×22 |
| 355mm | 300mm (12″) | PN16 | SDR11 | 256mm | 406mm | 12×22 |
| 400mm | 300mm (12″) | PN16 | SDR11 | 256mm | 406mm | 12×22 |
| 400mm | 350mm (14″) | PN16 | SDR11 | 289mm | 470mm | 12×26 |
| 400mm | 375mm (15″) | PN16 | SDR11 | 325mm | 495mm | 12×26 |
| 450mm | 375mm (15″) | PN16 | SDR11 | 325mm | 495mm | 12×26 |
| 450mm | 400mm (16″) | PN16 | SDR11 | 325mm | 521mm | 12×26 |
| 500mm | 450mm (18″) | PN16 | SDR11 | 366mm | 584mm | 12×26 |
| 560mm | 500mm (20″) | PN16 | SDR11 | 407mm | 641mm | 16×26 |
Application of AS 4087 Backing ring flanges
✅ Water Supply and Distribution
✅ Irrigation Pipelines
✅ Wastewater and Drainage
✅ Industrial Fluid Handling
✅ Desalination and Water Treatment
✅ Connection Between PE and Steel Pipelines
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