Clamp connection set for hygienic pipework: two clamp ferrules, a gasket, a hinged clamp ring and a blind end cap. The clamp and gasket are sized on the flange diameter, not on the bore.
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The clamp connection is the joint that made hygienic pipework quick to strip. Two flanged ferrules are welded to the tube, a gasket is laid between them, and a hinged band clamp squeezes the tapered flanges together — the flange at 20° and the gasket groove at 23° in ISO 2852, with a flange thickness of 2.85 mm. The joint is short, it opens with one wing nut, and it leaves nothing in the bore.
The one thing a buyer must understand is that the clamp and the gasket are sized on the flange diameter, not on the bore. Ferrules for 25 mm, 33.7 mm and 38 mm tube all carry the same 50.5 mm flange, so a 1 inch and a 1½ inch joint take the same clamp and the same gasket. The whole gasket vocabulary is eleven flange diameters: 34, 50.5, 64, 77.5, 91, 106, 119, 130, 155, 183 and 233.5 mm.
The series is not optional information. DIN 32676 Series A DN50 is 53 mm tube on a 64 mm flange, while Series B DN50 is 60.3 mm tube on a 77.5 mm flange: different clamps, different gaskets, same nominal size. Series C follows the inch tube of ASME BPE. A size given without its series is not an orderable description. Note too that ISO 2852 fixes the ferrule and gasket but states in its own scope that the clamp ring itself is not standardised — it specifies only clearances; DIN 32676 does list the clamp ring as part of the connection.
Permissible pressure follows the tube outside diameter — 25 bar up to 42.4 mm, 16 bar to 76.1 mm, 10 bar to 219.1 mm — between −10 °C and +140 °C with suitable clamps and seals, and it is the clamp and the gasket that decide it. State the series, the flange size, the clamp type (single-pin hinged, double-pin, heavy-duty or high-pressure), the gasket material and which parts of the kit you need, including whether the blind end cap is required.
| Kit Contents | Two clamp ferrules, a gasket, a hinged clamp ring with wing nut, and a blind end cap. State which parts are required — they are also sold separately |
|---|---|
| Connection | Clamp ferrule to DIN 32676 Series A, B or C, or ISO 2852; the series must be stated — it is not implied by the size |
| Joint Geometry | Flange angle 20°, gasket groove angle 23°, flange thickness 2.85 mm (js12), groove depth 1.6 mm (js13). ISO 2852 states in its scope that the clamp ring itself is not standardised and specifies only clearances (annex A: 1.6 mm minimum); DIN 32676 does list the clamp ring as part of the connection |
| Clamp and Gasket Sizing | Sized on the flange diameter, not the bore: 34, 50.5, 64, 77.5, 91, 106, 119, 130, 155, 183 and 233.5 mm. Tube of 25, 33.7 and 38 mm all takes the 50.5 mm clamp and gasket |
| Series Dimensions | DIN 32676 Series A DN50 is 53 mm tube on a 64 mm flange; Series B DN50 is 60.3 mm tube on a 77.5 mm flange; Series C follows ASME BPE inch tube. A nominal size without its series is not orderable |
| Pressure Range | Set by the clamp connection and falls with size: 25 bar to 42.4 mm tube OD, 16 bar to 76.1 mm, 10 bar to 219.1 mm. The clamp and the gasket determine the figure |
| Temperature Range | −10 °C to +140 °C for the clamp connection with suitable clamp and seals; the elastomer actually fitted sets the working limit |
| Wetted Material | Austenitic stainless steel selected from ISO 2604-1. Specify the grade: AISI 316L (1.4404) for wetted parts, AISI 304 (1.4301) acceptable for nuts, clamp rings and handles |
| Surface Finish | Ra < 1.0 µm on finely finished product-contact surfaces; Ra ≤ 0.8 µm is the finish usually quoted for hygienic service |
| Gasket | Natural or synthetic rubber of 75-85 IRHD to ISO 48, compatible with the product and the cleaning fluids and imparting no odour or taste. EPDM, NBR, VMQ, FKM or PTFE to be specified |
| 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 |
