Standards of pipework flanges vary across the world and in many cases they are not directly interchangeable. Differences can occur in the size, drilling pattern and pressure rating. For example a PN10 flange is not rated to the same pressure class as a PN16 flange, An imperial Table D flange may not fit with a metric PN10 flange and a PN16 metric flange would not fit with an ANSI Class 150 flange).
Woodside Fusion have a range of flange backing rings to compliment our polyethylene stub flanges. We are ready to give advice over the phone as to the suitability of each flange backing ring material, but our website also holds a lot of useful information to help you select the correct flange backing ring for your application.
Our Flange Backing Ring tables below cover our standard backing ring ranges. We have also included a small jargon buster to help you understand the frequently used terminology in our tables.
Key to Flange Jargon
Woodside Code: This is the code by which we identify our products on our website and our stock system. Ring us or email us and quote this code and we can help you with stock levels and pricing.
Flange DN: DN is a well-used abbreviation in the pipework industry for Diameter Nominal. The DN usually relates to steel pipework and slip flanges and bears on the diameter of the pipe that the flange terminates. We list our DN sizes in Metric and Imperial and our sales team are fluent with both measurements.
Flange PN (Drillings): PN is an abbreviation for Pressure Nominal. This usually denotes the pressure rating of the pipework and the hole spacing in the flange. For example a 200mm PN16 (16 bar) flange backing ring has more bolt holes than a 200mm PN10 (10bar) flange backing ring.
PE Pipe size: Most of our flange backing rings are for use with our PE stub flanges, so we included this column as a handy guide to show you which PE stub would be most compatible.
Flange OD: This is the overall Outer Diameter of the flange backing ring.
Flange ID: This is the Inner Diameter of the flange backing ring. You need to pay attention to this dimension to ensure it is compatible with the stub flange adaptor you are using the backing ring with.
Flange Thickness: Our flanges vary in thickness depending on materials and production methods.
PCD: The PCD is an abbreviation for Pitch Circe Diameter. Imagine a circle passing through the centre of the bolt holes in a flange backing ring, the PCD is the diameter of that circle.
No of Bolt Holes: The number of holes in our flange backing rings increase as the flange size increases. They also vary depending on the PN (pressure nominal) that the flange has to withstand when installed.
Diameter of Holes: Our flange backing rings are drilled/sized to take a metric bolt with 2mm total clearance.
Bolt Size: Recommended Metric Bolt Diameter.
Woodside Code | Compatible PE Pipe Size (mm) | Flange DN (Metric) | Flange DN (Imperial) | Flange PN (Drillings) | Flange OD D (mm) | Flange ID D1 (mm) | Flange Thickness B (mm) | PCD K (mm) | No. of Bolt Holes | Diameter of Holes | Size of Bolts |
WFSB025020G | 25 | 20 | 3/4" | PN 16/10 | 105 | 34 | 7 | 75 | 4 | 14 | M 12 |
WFSB032025G | 32 | 25 | 1" | PN 16/10 | 115 | 42 | 8 | 85 | 4 | 14 | M 12 |
WFSB040032G | 40 | 32 | 1-1/4" | PN 16/10 | 140 | 52 | 8 | 100 | 4 | 18 | M 16 |
WFSB050040G | 50 | 40 | 1/1/2" | PN 16/10 | 150 | 63 | 8 | 110 | 4 | 18 | M 16 |
WFSB063050G | 63 | 50 | 2" | PN 16/10 | 165 | 78 | 8 | 125 | 4 | 18 | M 16 |
WFSB075065G | 75 | 65 | 2-1/2" | PN 16/10 | 185 | 92 | 8 | 145 | 4 | 18 | M 16 |
WFSB090080G | 90 | 80 | 3" | PN 16/10 | 200 | 108 | 8 | 160 | 8 | 18 | M 16 |
WFSB110100G | 110 | 100 | 4" | PN 16/10 | 220 | 128 | 10 | 180 | 8 | 18 | M 16 |
WFSB125100G | 125 | 100 | 4" | PN 16/10 | 220 | 135 | 10 | 180 | 8 | 18 | M 16 |
WFSB160150G | 160 | 150 | 6" | PN 16/10 | 285 | 178 | 10 | 240 | 8 | 22 | M 20 |
WFSB180150G | 180 | 150 | 6" | PN 16/10 | 285 | 186 | 10 | 240 | 8 | 22 | M 20 |
WFSB200200G | 200/225 | 200 | 8" | PN 16 | 340 | 236 | 10 | 295 | 12 | 22 | M 20 |
WFSB250250G | 250 | 250 | 10" | PN 16 | 405 | 289 | 15 | 355 | 12 | 26 | M 24 |
WFSB280250G | 280 | 250 | 10" | PN 16 | 405 | 295 | 15 | 355 | 12 | 26 | M 24 |
WFSB315300G | 315 | 300 | 12" | PN 16 | 460 | 339 | 15 | 410 | 12 | 26 | M 24 |
WFSB355350G | 355 | 350 | 14" | PN 16 | 520 | 376 | 20 | 470 | 16 | 26 | M 24 |
WFSB400400G | 400 | 400 | 16" | PN 16 | 580 | 431 | 25 | 525 | 16 | 30 | M 27 |
WFSB450450G | 450 | 450 | 18" | PN 16 | 670 | 517 | 25 | 585 | 20 | 33 | M 30 |
WFSB500450G | 450 | 500 | 18" | PN 16 | 715 | 517 | 25 | 650 | 20 | 33 | M 30 |
WFSB500500G | 500 | 500 | 20" | PN 16 | 715 | 533 | 30 | 650 | 20 | 33 | M 30 |
Woodside Code | Compatible PE Pipe Size (mm) | Flange DN (Metric) | Flange DN (Imperial) | Flange PN (Drillings) | Flange OD D (mm) | Flange ID D1 (mm) | Flange Thickness B (mm) | PCD K (mm) | No. of Bolt Holes | Diameter of Holes | Size of Bolts |
WFSB200PN10G | 200/225 | 200 | 8" | PN 10 | 340 | 238 | 10 | 295 | 8 | 22 | M 20 |
WFSB250PN10G | 250 | 250 | 10" | PN 10 | 395 | 289 | 15 | 350 | 12 | 22 | M 20 |
WFSB280PN10G | 280 | 250 | 10" | PN 10 | 395 | 295 | 15 | 350 | 12 | 22 | M 20 |
WFSB315PN10G | 315 | 300 | 12" | PN 10 | 445 | 339 | 15 | 400 | 12 | 22 | M 20 |
WFSB355PN10G | 355 | 350 | 14" | PN 10 | 505 | 377 | 20 | 460 | 16 | 22 | M 20 |
WFSB400PN10G | 400 | 400 | 16" | PN 10 | 565 | 431 | 25 | 515 | 16 | 26 | M 24 |
WFSB450PN10G | 450 | 450 | 18" | PN 10 | 615 | 470 | 25 | 565 | 20 | 26 | M 24 |
WFSB500PN10G | 500 | 500 | 20" | PN 10 | 670 | 533 | 30 | 620 | 20 | 26 | M 24 |
Woodside Code | Compatible PE Pipe Size | Flange DN (Metric) | Flange DN (Imperial) | Flange PN (Drillings) | Flange OD D (mm) | Flange ID D1 (mm) | Flange Thickness B (mm) | PCD K (mm) | No. of Bolt Holes | Diameter of Holes | Size of Bolts |
WFSB025020Z | 25 | 20 | 3/4" | PN 16/10 | 105 | 34 | 12 | 75 | 4 | 14 | M 12 |
WFSB032025Z | 32 | 25 | 1" | PN 16/10 | 115 | 42 | 14 | 85 | 4 | 14 | M 12 |
WFSB040032Z | 40 | 32 | 1-1/4" | PN 16/10 | 140 | 52 | 14 | 100 | 4 | 18 | M 16 |
WFSB050040Z | 50 | 40 | 1/1/2" | PN 16/10 | 150 | 63 | 16 | 110 | 4 | 18 | M 16 |
WFSB063050Z | 63 | 50 | 2" | PN 16/10 | 165 | 78 | 16 | 125 | 4 | 18 | M 16 |
WFSB075065Z | 75 | 65 | 2-1/2" | PN 16/10 | 185 | 92 | 16 | 145 | 4 | 18 | M 16 |
WFSB090080Z | 90 | 80 | 3" | PN 16/10 | 200 | 108 | 18 | 160 | 8 | 18 | M 16 |
WFSB110100Z | 110 | 100 | 4" | PN 16/10 | 220 | 128 | 18 | 180 | 8 | 18 | M 16 |
WFSB125100Z | 125 | 100 | 4" | PN 16/10 | 220 | 135 | 18 | 180 | 8 | 18 | M 16 |
WFSB140125Z | 140 | 125 | 5" | PN 16/10 | 250 | 158 | 18 | 210 | 8 | 18 | M 16 |
WFSB160150Z | 160 | 150 | 6" | PN 16/10 | 285 | 178 | 20 | 240 | 8 | 22 | M 20 |
WFSB180150Z | 180 | 150 | 6" | PN 16/10 | 285 | 186 | 20 | 240 | 8 | 22 | M 20 |
WFSB225200Z | 200 | 200 | 8" | PN 16 | 340 | 236 | 23 | 295 | 12 | 22 | M 20 |
WFSB200200Z | 225 | 200 | 8" | PN 16 | 340 | 238 | 23 | 295 | 12 | 22 | M 25 |
WFSB250250Z | 250 | 250 | 10" | PN 16 | 405 | 289 | 29 | 355 | 12 | 26 | M 24 |
WFSB280250Z | 280 | 250 | 10" | PN 16 | 405 | 295 | 29 | 355 | 12 | 26 | M 24 |
WFSB315300Z | 315 | 300 | 12" | PN 16 | 460 | 339 | 34 | 410 | 12 | 26 | M 24 |
WFSB355350Z | 355 | 350 | 14" | PN 16 | 520 | 376 | 36 | 470 | 16 | 26 | M 24 |
WFSB400400Z | 400 | 400 | 16" | PN 16 | 580 | 431 | 41 | 525 | 16 | 30 | M 27 |
WFSB450450Z | 450 | 450 | 18" | PN 16 | 670 | 517 | 42 | 585 | 20 | 33 | M 30 |
WFSB500450Z | 450 | 500 | 18" | PN 16 | 715 | 517 | 42 | 650 | 20 | 33 | M 30 |
WFSB500500Z | 500 | 500 | 20" | PN 16 | 715 | 533 | 42 | 650 | 20 | 33 | M 30 |
Woodside Code | Compatible PE Pipe Size (mm) | Flange DN (Metric) | Flange DN (Imperial) | Flange PN (Drillings) | Flange OD D (mm) | Flange ID D1 (mm) | Flange Thickness B (mm) | PCD K (mm) | No. of Bolt Holes | Diameter of Holes | Size of Bolts |
WFSB025020SS | 25 | 20 | 3/4" | PN 16/10 | 105 | 34 | 7 | 75 | 4 | 14 | M 12 |
WFSB032025SS | 32 | 25 | 1" | PN 16/10 | 115 | 42 | 7 | 85 | 4 | 14 | M 12 |
WFSB040032SS | 40 | 32 | 1-1/4" | PN 16/10 | 140 | 52 | 7 | 100 | 4 | 18 | M 16 |
WFSB050040SS | 50 | 40 | 1/1/2" | PN 16/10 | 150 | 63 | 7 | 110 | 4 | 18 | M 16 |
WFSB063050SS | 63 | 50 | 2" | PN 16/10 | 165 | 78 | 8 | 125 | 4 | 18 | M 16 |
WFSB075065SS | 75 | 65 | 2-1/2" | PN 16/10 | 185 | 92 | 8 | 145 | 4 | 18 | M 16 |
WFSB090080SS | 90 | 80 | 3" | PN 16/10 | 200 | 108 | 10 | 160 | 8 | 18 | M 16 |
WFSB110100SS | 110 | 100 | 4" | PN 16/10 | 220 | 128 | 10 | 180 | 8 | 18 | M 16 |
WFSB125100SS | 125 | 100 | 4" | PN 16/10 | 220 | 135 | 10 | 180 | 8 | 18 | M 16 |
WFSB140125SS | 140 | 125 | 5" | PN 16/10 | 250 | 158 | 13 | 210 | 8 | 18 | M 16 |
WFSB160150SS | 160 | 150 | 6" | PN 16/10 | 285 | 178 | 13 | 240 | 8 | 22 | M 20 |
WFSB180150SS | 180 | 150 | 6" | PN 16/10 | 285 | 186 | 10 | 240 | 8 | 22 | M 20 |
WFSB200200SS | 200/225 | 200 | 8" | PN 16 | 340 | 236 | 10 | 295 | 12 | 22 | M 24 |
WFSB250250SS | 250 | 250 | 10" | PN 16 | 405 | 289 | 15 | 355 | 12 | 26 | M 24 |
WFSB280250SS | 280 | 250 | 10" | PN 16 | 405 | 295 | 15 | 355 | 12 | 26 | M 24 |
WFSB315300SS | 315 | 300 | 12" | PN 16 | 460 | 339 | 15 | 410 | 12 | 26 | M 24 |
Woodside Code | Compatible PE Pipe Size (mm) | Flange DN (Metric) | Flange DN (Imperial) | Flange PN (Drillings) | Flange OD D (mm) | Flange ID D1 (mm) | Flange Thickness B (mm) | PCD K (mm) | No. of Bolt Holes | Diameter of Holes | Size of Bolts |
25 | 3/4" | ASA Class 150 | 105 | 34 | 6 | 75 | 4 | 14 | M 12 | ||
32 | 1" | ASA Class 150 | 115 | 42 | 6 | 85 | 4 | 14 | M 12 | ||
40 | 1-1/4" | ASA Class 150 | 140 | 52 | 6 | 100 | 4 | 18 | M 16 | ||
50 | 1/1/2" | ASA Class 150 | 150 | 63 | 6 | 110 | 4 | 18 | M 16 | ||
63 | 2" | ASA Class 150 | 165 | 78 | 8 | 125 | 4 | 18 | M 16 | ||
75 | 2-1/2" | ASA Class 150 | 185 | 92 | 8 | 145 | 4 | 18 | M 16 | ||
90 | 3" | ASA Class 150 | 200 | 108 | 8 | 160 | 8 | 18 | M 16 | ||
110 | 4" | ASA Class 150 | 220 | 128 | 10 | 180 | 8 | 18 | M 16 | ||
125 | 4" | ASA Class 150 | 220 | 135 | 10 | 180 | 8 | 18 | M 16 | ||
140 | 5" | ASA Class 150 | |||||||||
160 | 6" | ASA Class 150 | |||||||||
180 | 6" | ASA Class 150 | |||||||||
200 | 8" | ASA Class 150 |