PE100 45 Degree Long-Radius Seamless Bend SDR 11 — Low-Loss Sweep for Water & Gas Process Lines
The PE100 45° long-radius seamless bend (SDR 11) is the smooth-turn fitting for process and transmission duty. Dual-rated Water PN16 (1.6 MPa) and Gas 10 Bar, it is mandrel heat-bent from solid PE100 pipe to a generous centreline radius — standard 3D, longer on request — giving a continuous wall, no mould seam and a bore that keeps head loss to a minimum.
On water treatment plant process piping, the long sweep avoids the turbulence and localised stress of a short moulded elbow. At pump station discharge, the gradual turn reduces water hammer and protects the pump check valve. On gas transmission mains, the smooth bore keeps velocity profile even and supports long-distance, high-volume flow.
Unlike a moulded 45° elbow which has a tight centreline and a visible parting line, this bend is one continuous piece of pipe — the fitter welds it like any other PE100 spigot, and the system designer gets a fitting engineered for steady-state, high-throughput duty.
Typical Applications
- Water treatment plant and wastewater treatment process piping
- Pump station discharge headers and clear-well outlets
- Long-distance gas transmission mains and collector loops
- Industrial cooling water circulation loops
- River and road crossing transition zones where smooth turns reduce stress
Key Features & Benefits
- Long-radius sweep — standard 3D, up to 10D on request; far lower head loss than a short moulded elbow
- Smooth continuous bore — no mould parting line, no internal flash, less turbulence
- Dual-rated SDR 11 — Water PN16 and Gas 10 Bar in one fitting
- Mandrel-bent seamless — no weld seam, no stress concentration at the bend
- Water-hammer friendly — gradual turn on pump discharge reduces pressure transients
- Butt fusion ends — welds directly to SDR 11 PE100 pipe per DVS 2207
- Cyclic pressure resistance — better fatigue life than moulded elbows on pump cycling duty
Moulded elbow vs long-radius seamless bend — which to use?
Use a moulded 45° elbow in tight, buried distribution trenches where space is limited and head loss is not critical. Use this long-radius seamless bend in pump houses, treatment plants and transmission mains — anywhere a short turn would waste energy, trigger water hammer, or put stress on the pipe wall. When the line is sized by hydraulic calculation, the long-radius bend is almost always the right choice.
45° Long-Radius Seamless Bend SDR 11 — Size Range & Rating
The 45° seamless bend is available across the full SDR 11 range. d63–315mm is standard stock; d20–50mm and d355–500mm are produced to order. Longer radii (5D / 8D / 10D) are made to drawing.
| Item |
Specification |
| Material |
Virgin PE100 (Borealis / Ineos) |
| Colour |
Black (with optional blue/yellow stripes for water/gas identification) |
| Standard Dimension Ratio |
SDR 11 |
| Water Pressure Rating |
PN16 (1.6 MPa at 20°C) |
| Gas Pressure Rating |
10 Bar |
| Bend Angle |
45° |
| Manufacturing Process |
Mandrel heat-bent (no mould) |
| Standard Centreline Radius |
3D (5D / 8D / 10D on request) |
| End Type |
Spigot for butt fusion |
| Size Range |
d20 – d500mm |
| Standard Stock |
d63 – d315mm |
| Z / L Dimensions |
Per ISO 8085-3 practice — CAD / dimension table on request |
| Marking |
PE100 · SDR11 · 45° · PN16/10Bar · Batch · Date |
Note: exact Z and L dimensions depend on the selected centreline radius (3D / 5D / 8D / 10D). Send your hydraulic calculation or offset drawing for a precise dimension sheet.
Product Standards & Certifications
All spigot fittings are manufactured from certified PE100 virgin material and tested against international piping system standards. Production is backed by ISO 9001 and ISO 29001 quality management systems.
- EN 12201-3 / ISO 4427-3 — PE fittings for water supply (PN16)
- EN 1555-3 / ISO 4437-3 — PE fittings for gas distribution & transmission (10 Bar)
- DVS 2207 / ISO 21307 — Butt fusion jointing procedures for PE pipes and fittings
- ISO 9001 / ISO 29001 — Quality management for pipeline product manufacture
Note: suitable for potable water and gas transmission duty. Material certificates and test reports supplied on request.
Shipping & Delivery Information
Long-radius bends are longer than short moulded elbows and ship as shaped cargo. We pack them with angle-form separators and end caps to protect the weld ends.
After-Sales Service & Warranty
We stand behind the quality of our spigot fittings. Our commitment doesn't end at delivery — we provide welding, radius selection and installation technical support for your water plant, pump station or gas transmission project.
Frequently Asked Questions
Common questions about our 45° long-radius SDR 11 seamless bend
Why choose a long-radius 45 degree seamless bend over a moulded 45 elbow?+
A long-radius seamless bend has a much smoother centreline than a short moulded elbow — lower head loss, less turbulence, and fewer stress concentrations. It is preferred on pump discharge lines, water treatment plant piping and gas transmission mains where smooth flow matters.
What is SDR 11 rated for?+
SDR 11 is dual rated: Water PN16 (1.6 MPa) and Gas 10 Bar. It is the standard wall class for municipal water mains and medium-to-high pressure gas distribution and transmission.
What radius is available on the 45 degree seamless bend?+
Standard centreline radius is 3D. Longer radii (5D, 8D, 10D) are available on request — longer radius means even lower head loss, useful on pump headers and high-velocity transmission lines.
Which sizes are available?+
The 45° seamless bend is available from d20mm to d500mm, with d63-315mm in standard stock and larger sizes produced on request.
Is the bend butt-fusion compatible?+
Yes — both spigot ends are machined to SDR 11 PE100 pipe dimensions and weld with a standard butt fusion machine per DVS 2207.
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