Technical comparison
Two positive-displacement families from FB Bombas. The choice depends on viscosity, tolerable pulsation and installation geometry.
FBE and FBEI are positive displacement pumps with different geometries: external gears in FBE and internal gearing in FBEI. Compare the fluid, viscosity at pumping temperature, flow, differential pressure and construction. Catalogue limits describe the range; selection requires model-specific data and process conditions.
Compare the characteristics and bring your actual process conditions to the technical discussion.
External gear · wide range
external gears
Internal gear · fluid transfer
viscous-fluid transfer
Assess the characteristics below against the configuration and documentation of each pump.
| Criterion | FBE | FBEI |
|---|---|---|
| Principle | External helical gears (driver + driven) | Internally toothed rotor and smaller inner gear |
| Pulsation | Assess at the duty point and for the selected assembly | Catalogue describes constant flow; no pulsation tolerance is provided |
| Size range | MTEC-01/01 manual: 1/8″ to 6″; current catalogue includes a 10″ size | Catalogue: HL 1½″ to N 6″; MAN001-10 manual: 1″ to 4″ configurations |
| Flow | Up to 390 m³/h in the manual reference; confirm model, viscosity and speed | Catalogue: up to 136 m³/h; the limit varies by size |
| Published pressure and head | Manual: up to 220 m head; confirm differential pressure for the fluid and model | Catalogue: up to 14 bar differential pressure; confirm model and conditions |
| Temperature | 2026 FBE catalogue (p.3): 10 to 500 °C for the series. Configuration, materials and sealing define the applicable limit | Catalogue: up to 340 °C for the range. Jacket in the manual: steam 185 °C/10 bar or thermal fluid 232 °C/10 bar |
| Relief valve | Optional | Configuration-dependent; the manual requires external protection when no valve is fitted |
| Installation data | Check dimensions, connections and access for the proposed configuration | Check dimensions, connections and access for the proposed configuration |
| Technical documentation | FBE catalogue and MTEC-01/01 operating manual, with distinct scopes | FBEI catalogue and MAN001-10 operating manual, with distinct scopes |
| Materials by component | Separate options for casing and covers, shafts and gears, bushings and valve | Casing, gears and bushings; casing and support according to the standard series execution |
| Sealing options | Packing, mechanical seal or lip seal; confirm configuration | Packing, single, double or cartridge mechanical seals; confirm configuration |
Select the model for the actual process conditions: the range maxima are not simultaneous. Catalogues and manuals have different scopes. Where their information differs, confirm the execution in the proposal. FB Bombas documents are in Portuguese.
Start with fluid conditions. Viscosity, temperature and particles inform the assessment of both geometries. The FBEI catalogue describes constant flow, but provides neither a dosing tolerance nor a quantitative pulsation comparison with FBE. If the process requires precision or low pulsation, provide that requirement for assessment of the complete assembly.
Distinguish the catalogue from the operating manual. Current catalogues extend the presentation of sizes and general limits; manuals retain installation instructions and documented dimensional configurations. Pumped-fluid temperature and heating-jacket conditions are different quantities. A catalogue maximum must not be applied automatically to every model, material or seal.
Compare both series at the requested duty point. Provide viscosity at pumping temperature, flow, differential pressure and suction conditions. The proposal should identify the model, execution and assessed limits, including heating when required.
The geometries differ and should be compared under the actual process conditions. The FBEI catalogue describes viscous-fluid transfer and constant flow. This alone does not establish dosing accuracy or superiority for every application. Provide the required flow tolerance, viscosity, temperature and differential pressure.
The documents do not establish one answer for every model. The 2026 FBE catalogue states 10 to 500 °C for the series (p.3); configuration, materials and sealing define the applicable limit, confirmed by engineering. The FBEI catalogue states up to 340 °C. MAN001-10 jacket limits are separate: steam at 185 °C/10 bar or thermal fluid at 232 °C/10 bar. Confirm materials, seals and proposal conditions.
MAN001-10 instructs checking alignment again after securing the base and connecting the piping. Follow the manual alignment procedure and the coupling instructions for the supplied assembly. Assembly conditions before transport do not replace verification at the final installation.
Each range has a catalogue and a manual serving different purposes. Catalogues present characteristics and general limits; FBE MTEC-01/01 and FBEI MAN001-10 contain instructions and data for documented configurations. Consult the technical library and confirm the equipment data sheet before selection.
No. A stainless steel casing is only part of the specification. FBE has separate material options for the casing and covers, shafts and gears, bushings and valve. For FBEI, distinguish the general casing, gear and bushing options from the standard series casing and support options. Request the materials for each component and the sealing selected for your fluid and temperature in the proposal. Chemical compatibility depends on the complete configuration.
Review the related product lines and technical resources before specifying the equipment.
Tell us the fluid, temperature, viscosity, flow rate and pressure. Our team can review the application with you.
