Polished stainless steel butt-weld bend for hygienic process pipework. Supplied for welding into the line; state the angle, the radius, the tube standard and size, the grade and the internal finish.
Prices on request. Contact us for availability and quotations.
A hygienic bend is drawn from tube rather than cast or moulded, so the bore, the wall and the internal finish carry through the fitting without a step. That is what makes the line cleanable in place: a step or a weld bead standing proud in the bore is a soil trap and a place for a biofilm to establish.
Both ends are plain, for butt welding. In DIN 11852 the bends are designated by angle and radius — BS-90, BS-45 and BS-180 for the standard radius and BL-90 and BL-45 for the long radius. The long radius is specified where pressure drop matters, where the product is shear-sensitive, or where a pig or a spray device has to pass.
Material is austenitic stainless steel, in practice 316L (1.4404) for wetted service in this market because it carries molybdenum and resists chlorides from brine and chlorinated CIP. The internal surface should be specified as an Ra value rather than a grit number: two suppliers polishing to the same grit can land at different roughness.
State the tube standard and size, the angle and the radius, the grade, the internal Ra and the surface condition. Weld preparation and purge matter as much as the fitting — an unpurged root leaves an oxidised, rough weld inside the bore that no polish reaches after assembly. Ask for the EN 10204 3.1 certificate at the order stage.
| Fitting Type | Butt-weld bend, plain ends. DIN 11852 designations: BS-90, BS-45 and BS-180 standard radius, BL-90 and BL-45 long radius. The angle and radius must be stated |
|---|---|
| Standard | DIN 11852 tubular fittings for DIN 11851 pipework; the ISO equivalents are ISO 2851 for bends and tees, and BS 4825-2 in the British hygienic series |
| Size Range | EN 10357-A (former DIN 11850 Reihe 2) tube, DN10 to DN200 — outside diameter 13, 19, 23, 29, 35, 41, 53, 70, 85, 104, 129, 154 and 204 mm. The DN label is neither the bore nor the outside diameter |
| Pressure Rating | DIN 11852 tubular fittings: 25 bar for DN10-DN50, falling above DN50 to between 5 and 10 bar at DN150-DN200, usable to a maximum of 150 °C. Bends, tees and reducers step down differently above DN50 |
| Material | Austenitic stainless steel; specify AISI 316L (1.4404) for wetted service or 304L (1.4307). DIN-system tube and fittings are normally EN 10217-7 |
| Surface Finish | Finely finished product-contact surfaces Ra < 1.0 µm, other surfaces Ra < 2.5 µm, weld seam Rmax ≤ 16 µm; hygienic practice for internal surfaces is Ra ≤ 0.8 µm |
| Applicable Hygiene Standard | 3-A 63-04 Sanitary Fittings is the applicable class for this type of equipment. The goods are not asserted to carry the 3-A Symbol |
| Certification to Specify | EN 10204 3.1 inspection certificate for wetted stainless steel parts |
