Selecting the socket fusion Elbow Bend comes down to matching three variables: the dn size of the pipe, the SDR of that pipe, and the joint type. Get those right and the fusion geometry follows on its own.
This page is the decision sequence; the numbers themselves are on the dimensions page.
Step 1: confirm the pipe size and SDR
Measure the pipe outside diameter and read the SDR from the pipe marking. The socket fusion Elbows are supplied dn20 to dn63 in SDR11.
| Size band | Wall series | Typical use |
|---|---|---|
| dn20 - dn32 | SDR11 and SDR17 | service and house connections |
| dn40 | SDR11 and SDR17 | service and house connections |
| dn50 - dn63 | SDR11 and SDR17 | service and house connections |
If the pipe marking is unreadable, measure the wall at three points round the circumference and divide the outside diameter by the mean wall. For the socket fusion Elbow Bend that gives the SDR closely enough to pick the right unit.
Step 2: match the unit to the pipe series
A socket moulded for SDR11 will not close on SDR17 pipe. The socket depth and the fusion zone are set by the wall series, not by the dn size, so the pair has to be matched for the socket fusion Elbow Bend.
Where a line mixes series, order the socket fusion Elbows against the pipe actually being laid at each joint, not against the nominal size of the run.
Step 3: check the pressure class
Pressure class follows from the wall series and the material grade. Confirm the design pressure of the line before the socket fusion Elbows are ordered, because a change of series after moulding is a new tool, not a re-label. The series on offer are SDR11 across dn20 to dn63.
Common selection mistakes
The mistakes below account for most re-quotes on the socket fusion Elbow Bend across the dn20 to dn63 range:
- Quoting a dn size without the SDR., Mixing unit and pipe from different wall series., Assuming one unit suits both electrofusion and socket fusion joints., Ordering to an imperial size when the line is metric. and Choosing on price alone for a line whose design pressure is fixed.
Related pages
Other pages in the socket fusion Elbow Bend section, each covering a different angle of the same product family:
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![HDPE Butt Fusion Elbow]()
HDPE Butt Fusion ElbowHDPE Butt Fusion Elbow is a full family of square-end PE100 bends spanning 11° / 22° / 45° / 90°, each joined with a standard machine and carrying the full rating of the HDPE line it is fused into.
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![Fusion weld fittings elbow 180mm]()
Fusion weld fittings elbow 180mmFusion weld fittings elbow 180mm is made by injection molding with high-quality PE100 grade raw materials and is connected to pipes of the same specification through butt welding techniques to form
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![HDPE 45 Degree Elbow Butt Fusion Fitting]()
HDPE 45 Degree Elbow Butt Fusion FittingHDPE 45 Degree Elbow Butt Fusion Fitting is an important accessory used in PE pipeline systems to change the flow direction. It achieves an integrated connection with the pipe through hot-melt
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![HDPE 90 Degree Elbow Butt Fusion Fitting]()
HDPE 90 Degree Elbow Butt Fusion FittingHDPE 90 Degree Elbow Butt Fusion Fitting is a compact PE100 bend that turns a line squarely inside confined layouts — full bore, full pressure rating, joined by standard butt fusion on both machined
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