Pipe diameter is the first thing a buyer knows and the last thing that should decide the meter. Still, the size band tells you a great deal about how the purchase will run.
DN15 – DN32 · household inlets
Per-unit metering in apartments and houses, metered individually and usually prepaid or remote-read. Orders run to thousands of units, and the decision rests on unit price, lead time, local approval and after-sales coverage rather than on technical differentiation. DN32 is a boundary size: supplied with this range and quoted on the same terms.
DN40 – DN100 · building and district
One building inlet, one floor, or an industrial branch. Orders run to tens or a few hundred units. Turndown ratio, communication protocol, flange standard and integration with the reading system you already run decide the fit. This is the band where an oversized meter does the most quiet damage: it sits below its accurate range most of the day and under-reads continuously.
DN125 – DN300 · distribution mains
City distribution mains, DMA trunks, industrial intakes and large irrigation schemes. Highest unit value, always tendered, and decided by third-party verification, comparable project references, and material and pressure rating. DN125 is a boundary size: handled as a main and following the DN150 verification route.
Size from the demand, not from the pipe
The most common sizing error is matching the meter to the flange rather than to the flow. Measure peak, average and night flow over a representative period, then choose the permanent flow rate from that profile. In many building mains the correct answer is one size down from the pipe.
What to send us
- Nominal diameter and connection type at each point — threaded or flanged, and which flange standard.
- Measured or estimated flow range, including the night figure if you have it.
- Quantity at each size, and whether delivery is one lot or staged.
- Communication required, and the platform it has to report into.