Normalized Centrifugal Pump
FBCN 250-500
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
1,800 m³/h
Head
40–138 m w.c.
Absorbed power
150–650 HP
NPSH required
4–10 m
Maximum efficiency
82%
Performance Curves
Q × H hydraulic envelope of the FBCN FBCN 250-500 pump at 1750 rpm, extracted from the official FBCN Technical Manual (curve CC-0209.09) and bench-validated at FB Bombas test facility in Cabreúva–SP, Brazil.
- Flow range
- 400.0 – 1,600.0 m³/h
- Head range
- 58.0 – 138.0 m
- Impellers
- 6 × Ø 504–400 mm
- Speed
- 1750 rpm · CC-0209.09
Hydraulic envelope — all impellers
Overlaid H × Q curves. Each color represents one impeller diameter.
- Ø 504 mm
- Ø 480 mm
- Ø 460 mm
- Ø 440 mm
- Ø 420 mm
- Ø 400 mm
Impeller Ø 504 mm
| Flow · m³/h | 400.0 | 800.0 | 1,200.0 | 1,600.0 |
|---|---|---|---|---|
| Head H · m | 138.0 | 128.0 | 112.0 | 78.0 |
Impeller Ø 480 mm
| Flow · m³/h | 400.0 | 800.0 | 1,200.0 | 1,600.0 |
|---|---|---|---|---|
| Head H · m | 128.0 | 117.0 | 97.0 | 58.0 |
Impeller Ø 460 mm
| Flow · m³/h | 400.0 | 800.0 | 1,200.0 |
|---|---|---|---|
| Head H · m | 118.0 | 105.0 | 82.0 |
Impeller Ø 440 mm
| Flow · m³/h | 400.0 | 800.0 | 1,200.0 |
|---|---|---|---|
| Head H · m | 107.0 | 93.0 | 65.0 |
Impeller Ø 420 mm
| Flow · m³/h | 400.0 | 800.0 |
|---|---|---|
| Head H · m | 97.0 | 80.0 |
Impeller Ø 400 mm
| Flow · m³/h | 400.0 | 800.0 |
|---|---|---|
| Head H · m | 87.0 | 68.0 |
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 | 504 mm | 43 mm |
| 2 | 480 mm | 43 mm |
| 3 | 460 mm | 43 mm |
| 4 | 440 mm | 43 mm |
| 5 | 420 mm | 43 mm |
| 6 | 400 mm | 43 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
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)
