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Water volume in pipework
Enter the length of each pipe size to get the litres in the system: check dry system capacity and plan flushing and test water.
Quick answer
200 m of pipe holds 659 litres of water (0.66 m³, 659 kg).
Preliminary results
Total water659L
Volume0.66m³
Water weight659kg
| Size | Inside diameter | L/m | Length (m) | Litres |
|---|---|---|---|---|
| DN25 | 27.3 | 0.59 | 60 | 35 |
| DN32 | 36.0 | 1.02 | 20 | 20 |
| DN40 | 41.9 | 1.38 | 20 | 28 |
| DN50 | 53.1 | 2.21 | 30 | 66 |
| DN65 | 68.9 | 3.73 | 20 | 75 |
| DN100 | 105.3 | 8.71 | 50 | 435 |
Capacity below 2,839 L (750 gal): no quick-opening device required for a dry system under NFPA 13 ⚠.
Sources and assumptions. V = π·d²/4·L using inside diameters from the pipe table on this site. Dry system capacity limit per NFPA 13 ⚠. ⚠ = code table value to be checked against the original standard. Preliminary results for material selection and budgeting; not a substitute for an approved fire protection design.
Frequently asked questions
How much water is in 1 m of DN100 pipe?
BS 1387 medium DN100 has about 105.3 mm inside diameter and holds about 8.7 litres per metre.
Why does dry system capacity matter?
A dry system is filled with air; water must push it out before reaching the heads. Bigger systems are slower, so NFPA 13 limits capacity or requires a delivery-time calculation.