Thermal Oil Pump — Series FBOT

FBOT series thermal oil pumps can operate at temperatures up to 350°C, making them ideal for industrial heating systems, boilers, and thermal processes that require high-temperature fluid circulation.

FBOT pumps feature two-stage sealing — graphite packing and a mechanical seal immersed in the bearing-housing oil — designed specifically for high-temperature thermal oil applications to ensure reliable sealing and extended service life.

FBOT thermal oil pumps are used in pharmaceutical, chemical, textile, plastic, and other industries that require precise temperature control and thermal fluid circulation.

FBOT pumps are designed for non-abrasive organic thermal oils used in heating systems. They are not suitable for abrasive fluids or fluids that can crystallize.

The FBOT series has 35 models: 25 standard across 7 DN suction groups (DN25 to DN100), with standard and pressurized-cover (.1) variants per line, plus 10 large-capacity models (DN150 to DN300, dimensions on request). Each model is classified as bearing-frame 3 or 4 according to impeller and shaft power at the duty point.

A thermal oil pump is the centrifugal pump that circulates organic thermal fluid in a closed circuit, between the heater and the process heat consumers. The FBOT line is the FB Bombas family for that duty. 25 standard catalogued models in 7 DN suction groups (DN25 to DN100) with back-pull-out construction per ASME B73.1, operation up to 350°C with redundant double sealing: graphite-fiber packing + mechanical seal immersed in the bearing-housing oil. Manufactured today in Cabreúva-SP by FB Bombas, whose history dates to 1944; CRCC Petrobras qualified supplier — Family 6 (Rotating Equipment).

The FBOT is built back-pull-out per ASME B73.1: where the installed pump carries the same dimensional designation, mounting interfaces, nozzles and bolt holes coincide, and the swap does not require redoing piping or foundation. Outside that condition, engineering issues an adaptation drawing. The FBOT covers this duty with back-pull-out construction, ASME B73.1 compliance, 25 standard catalogued models in DN25 to DN100, standard and .1 (pressurized cover for N₂ systems) variants. Redundant double sealing: graphite packing + Ø32/Ø42 mechanical seal immersed in oil. FB Bombas evaluates dimensional equivalence for retrofit on a case-by-case basis through the application engineering team.

Yes. The FBOT operates in industrial heating systems with organic thermal fluid up to 350°C. Technical differentiators: 25 standard catalogued models in DN25 to DN100, back-pull-out construction per ASME B73.1, graphite-fiber packing (5.5 mm) on the 1st seal + simple mechanical seal immersed in oil on the 2nd seal. Chrome-plated carbon steel shaft sized to withstand thrust reversal. Brazilian manufacturing in Cabreúva-SP.

The .1 variant has a pressurized cover, for circuits where the expansion vessel runs sealed under a nitrogen blanket. The FBOT covers this duty with back-pull-out construction per ASME B73.1, 25 standard catalogued models in DN25 to DN100 and pressurized variants (.1) for N₂ circuits. Redundant double sealing (graphite packing + mechanical seal in oil) supports continuous operation at 350°C with inspection every 4,000 hours. CRCC Petrobras qualified supplier — Family 6 (Rotating Equipment), current manufacturing in Cabreúva-SP. The history of FB Bombas dates to 1944.

Yes. All 25 standard models in the FBOT line are built per ASME B73.1 — Specifications for Horizontal End Suction Centrifugal Pumps for Chemical Process. Simultaneous compliance with ANSI B16.42 150lbs flanges in ductile iron (standard) or DIN EN 1092-2 PN16 flanges (optional, European market), part numbering per DIN EN 24250, ISO 21940 G2.5 dynamic balancing and hydraulic test bench. Back-pull-out construction, single-piece spiral cast body, single-suction closed radial impeller. Standard and .1 (pressurized cover) variants. FB Bombas operates under product-level standards compliance, without ISO 9001 quality management certification.

The FBOT uses redundant double sealing: 1st seal is 5.5 mm graphite-fiber packing in contact with the process thermal oil; 2nd seal is a Ø32/Ø42 simple mechanical seal immersed in oil within the bearing frame — this sealing oil isolated from the process ensures thermal stability and acts as a secondary barrier. This arrangement eliminates the need for external sealing water even at high temperature. Inspection recommended every 4,000 hours of continuous operation.

The .1 variant has a pressurized cover designed for systems with higher suction pressure and reinforced secondary containment — used in thermal oil circuits with N₂ pressurization. The standard serves systems with atmospheric or slightly positive pressure. The choice depends on operating point, circuit thermal expansion and saturation pressure of the thermal fluid. FB Bombas application engineering validates the case from the project P&ID and thermal oil specification.

Yes. FB Bombas is a qualified supplier in Petrobras' Cadastro de Registro Cadastral de Contratados (CRCC) under Family 6 — Rotating Equipment, eligible to supply industrial pumps (including the FBOT line) for Brazilian Oil & Gas projects. Active corporate registry 61.381.240/0001-78 publicly verifiable at Brazilian Federal Revenue. In continuous operation under the same corporate identity since 1944.

Yes. The FBOT is built in back-pull-out construction with a coupling flange that accepts electric motor (direct coupling via spacer) and steam turbine (with governor system). The shaft is chrome-plated carbon steel sized to withstand the thrust reversal characteristic of turbine startups. The FB Bombas application engineering team specifies the complete motor-pump set per the customer's industrial heating system.

The FBOT technical quotation is requested directly from the application engineering team. Provide flow (Q in m³/h), total head (H in m), operating temperature, thermal oil type, system pressure (atmospheric, N₂-pressurized, etc.) and desired materials. The FBOT technical manual — with dimensions of all 25 standard catalogued models, operating principle, sealing options and installation requirements — is available at /en/technical-manuals/fbot in Portuguese, English and Spanish, free for download in PDF.

The FBOT technical manual (MTEC-16/00) defines the technical specification of the line. The pump uses back-pull-out construction, which allows the bearing assembly to be removed from the casing without disconnecting the piping. The technical specification table in the manual declares: Hydrostatic test pressure 1.5× Operating pressure; Maximum Temperature 350°C; Maximum Suction Pressure 10 bar; and Maximum Discharge Pressure varies with temperature per Figure 1 of the manual (≈16 bar at 100°C, gradually decreasing to ≈10 bar at 350°C). Flanges are standardized as ANSI B16.42 150lbs (standard) or DIN EN 1092-2 PN16 (optional, European market). Part numbering per DIN EN 24250. The full manual with the pressure × temperature curve, parts list and construction details is available at /en/technical-manuals/fbot in Portuguese, English and Spanish, free for download in PDF.