Normalized Centrifugal PumpFBCN 250-400
Large-capacity model for critical industrial installations: refineries, steel mills, chemical plants, municipal water supply and mining. Back pull-out construction per ASME B73.1.
Performance Envelope — 1750 rpm
Maximum flow
1,450 m³/h
Head
20–87 m w.c.
Absorbed power
150–350 HP
NPSH required
6–9 m
Maximum efficiency
86%
Performance Curves
Q × H hydraulic envelope of the FBCN 250-400 pump at 1750 rpm, per the official FB Bombas technical catalog (curve CC-0208.09), with ISO 9906 hydraulic guarantees. Reference plot for pre-sizing — confirm the operating point with FB Bombas engineering.
- Flow range
- 0.0 – 1,450.0 m³/h
- Head range
- 20.0 – 87.0 m
- Impellers
- 5 × Ø 404–338 mm
- Speed
- 1750 rpm · CC-0208.09
Hydraulic envelope — all impellers
Overlaid H × Q curves. Each color represents one impeller diameter.
- Ø 404 mm
- Ø 380 mm
- Ø 360 mm
- Ø 340 mm
- Ø 338 mm
Impeller Ø 404 mm
| Flow · m³/h | 0.0 | 400.0 | 800.0 | 1,200.0 | 1,450.0 |
|---|---|---|---|---|---|
| Head H · m | 87.0 | 85.0 | 80.0 | 66.0 | 55.0 |
Impeller Ø 380 mm
| Flow · m³/h | 0.0 | 400.0 | 800.0 | 1,100.0 | 1,300.0 |
|---|---|---|---|---|---|
| Head H · m | 80.0 | 77.0 | 71.0 | 55.0 | 42.0 |
Impeller Ø 360 mm
| Flow · m³/h | 0.0 | 400.0 | 800.0 | 1,050.0 | 1,250.0 |
|---|---|---|---|---|---|
| Head H · m | 72.0 | 69.0 | 62.0 | 47.0 | 33.0 |
Impeller Ø 340 mm
| Flow · m³/h | 0.0 | 400.0 | 800.0 | 1,000.0 | 1,200.0 |
|---|---|---|---|---|---|
| Head H · m | 62.0 | 59.0 | 52.0 | 42.0 | 25.0 |
Impeller Ø 338 mm
| Flow · m³/h | 0.0 | 400.0 | 800.0 | 1,050.0 | 1,250.0 |
|---|---|---|---|---|---|
| Head H · m | 52.0 | 49.0 | 42.0 | 31.0 | 20.0 |
Available impeller diameters
Each pump ships with the impeller diameter calculated by FB engineering for the specific operating point — design flow and head.
| # | Impeller diameter | Impeller useful width |
|---|---|---|
| 1 | 404 mm | 63 mm |
| 2 | 400 mm | 63 mm |
| 3 | 380 mm | 63 mm |
| 4 | 360 mm | 63 mm |
| 5 | 340 mm | 63 mm |
| 6 | 338 mm | 63 mm |
Typical applications
- Cooling systems for chemical plants and refineries
- Industrial water lines in steel mills and mining
- Treated water pumping in water utilities
- Large NFPA-20 fire-fighting systems
- Lubricating oil cooling for turbomachinery
Frequently Asked Questions
Technical questions about the FBCN 250-400 centrifugal pump.
Physical dimensions and detailed curve
FBCN large-capacity models do not have individual physical dimensions published in the standard technical manual. Each project receives dimensional drawing, project-specific performance curve and material selection through direct consultation with FB Bombas engineering.
- Dimensional drawing with base, flanges, shaft and shaft end per ASME B73.1
- Printed performance curve at the project operating point
- Material selection (cast iron / steel / 316 stainless / duplex) by fluid
- API 682 mechanical seal plan (1, 2, 11, 21, 31, 32, 53A, 53B, 53C)