Pipeline Pump Flange Dimensions by Size, DN25 to DN400

The questions that come right after an order are often about connections: what flange is on the pump, and what should the installer buy to meet it. These are the flange sizes on our pipeline pumps.

Flange size	Outside diameter D (mm)	Bolt circle D1 (mm)	Bolt holes
DN25	115	85	4 × Φ16
DN32	140	100	4 × Φ16
DN40	150	110	4 × Φ18
DN50	165	125	4 × Φ18
DN65	185	145	4 × Φ18
DN80	200	160	8 × Φ18
DN100	220	180	8 × Φ18
DN125	250	210	8 × Φ18
DN150	285	240	8 × Φ22
DN200	340	295	12 × Φ22
DN250	405	355	12 × Φ26
DN300	460	410	12 × Φ26
DN350	520	470	16 × Φ26
DN400	580	525	16 × Φ30

These follow the common PN16 drilling, so standard PN16 counter flanges fit.

Check before you buy

• The flange size usually equals the first number of the model: an ISG65-160 has DN65 flanges
• A few high-flow (I) builds use the next flange size up; for example the 125-315(I) family carries DN150 flanges. Check the model in the selection table or ask us
• If your pipework uses another standard, such as ANSI, order adaptor flanges or tell us before production

Find your model in the selection table.