SeriesFBOT
Developed for pumping organic thermal oils. Bearing seal with dual safety system: oil-immersed mechanical seal and graphite packing.
Discover the FBOT Series: Thermal Oil Pump
Hot Oil Pump up to 350°C with dual sealing
The FBOT Series is developed for pumping organic thermal oils at temperatures up to 350°C. Back Pull-Out construction allows bearing assembly removal without disconnecting piping. Bearing seal with dual safety system: graphite fiber packing (5.5 mm) in the first stage in contact with the fluid, and simple mechanical seal (Ø32/Ø42) immersed in oil in the bearing housing. Single-piece spiral volute casing without feet.
Dual sealing system: graphite packing + oil-immersed mechanical seal
Back Pull-Out design: maintenance without disconnecting piping
DN 25 to DN 300 — up to 2,200 m³/h, 135 m and 3,500 rpm
Up to 350°C — cast iron, carbon steel or stainless steel
Side View
Rear View
The FBOT Series is FB Bombas' centrifugal pump line for thermal oil, designed to circulate organic thermal fluids in industrial heating systems up to 350°C. It features a special mechanical seal immersed in oil with integrated cooling chamber, eliminating the need for external sealing water even at high temperatures. Robust construction in cast iron or carbon steel, oversized bearings for continuous 24/7 operation. Typical applications: thermal oil boilers, industrial presses, pharmaceutical, plastic and chemical processes, textile, pulp and paper, food industry, and any plant that depends on reliable thermal fluid circulation.
Motor-Pump Assembly
Complete system ready for installation
FB Bombas supplies complete FBOT motor-pump assemblies: pump, electric motor, flexible coupling with guard and structural steel baseplate. Dual systems available for applications requiring operational redundancy.
Dual Pump Set
Two FBOT pumps on shared baseplate with electric motors and coupling guard — for systems requiring operational redundancy.
Ready-to-Install Assembly
Dual FBOT motor-pump assembly ready for installation — manufactured at the FB Bombas plant in Cabreúva-SP.
Cutaway View
Internal components and sealing system
Cutaway view of the FBOT pump revealing internal construction: closed radial impeller, dual sealing system (graphite packing + oil-immersed mechanical seal), shaft with bearings and bearing housing chamber. Back Pull-Out design allows assembly removal without disconnecting piping.
Closed radial impeller — Ø152 to Ø317 mm
Graphite packing 5.5 mm + mechanical seal Ø32/Ø42
Bearings 6306/6308 C4 (oil) + ZZ C4 WT (grease)
General Description
Specialized construction for pumping organic thermal oils
Volute Casing
Spiral-shaped casing, cast as a single piece without feet. Supported directly on the mounting baseplate.
Back Pull-Out
The bearing assembly can be removed from the casing without disconnecting piping. Easy assembly, disassembly and maintenance.
Closed Impeller
Closed radial-type impeller, single suction. Maximum diameter 152 to 317mm.
Dual Sealing
Bearing seal with dual safety system: graphite packing (5.5mm) and mechanical seal (Ø32/Ø42) immersed in oil.
Operating Data
Per technical manual MTEC-16/00
Sizes
DN25 - DN300
Max Flow
2.200 m³/h
Max Head
135 m
Max Temperature
350°C
Max Speed
3.500 rpm
Suction Pressure
10 bar
Rotation Direction
Clockwise (drive side)
Weight
28 - 320 kg
Main Components
Construction details per technical manual
Casing (Body)
Spiral-shaped casing, cast as a single piece without feet. Mounted on baseplate.
Impeller
Closed radial type, single suction. Width 5 to 23mm. Designed for organic thermal oils.
Shaft
Graphite packing (5.5mm) in 1st stage in contact with thermal oil. Mechanical seal (Ø32/Ø42) in bearing, immersed in oil.
Bearing Housing
2 bearings: one oil-immersed (6306/6308 C4) and one sealed, grease-lubricated (6306/6308 ZZ C4 WT).
Dual Sealing System
Exclusive feature for maximum operational safety
Bearing seal with dual safety system, using oil-immersed mechanical seal and graphite packing.
1st Seal: Graphite Packing
Graphite fiber packing (5.5mm) in the first sealing stage, in the region in contact with the pumped fluid (thermal oil).
2nd Seal: Mechanical Seal
Simple mechanical seal (Ø32/Ø42) inside the bearing housing, immersed in oil ensuring thermal stability of the system.
Result: Maximum operational safety with sealing redundancy
Power Reserve
Recommended margin for motor sizing
| Required Power (HP) | Power Reserve - Motor |
|---|---|
| up to 2 | ~20% (minimum 1.5HP) |
| up to 20 | ~15% |
| above 20 | ~10% |
Accessories
Complementary components for installation
Flanges
ANSI B16.42 and DIN EN1092-2 PN16 (optional).
Drive
Electric motor.
Coupling
Flexible with or without FB standard spacer or other manufacturers.
Guard
FB standard carbon steel or anti-spark material guard.
Baseplate
Steel U-shaped sheet baseplate.
Application Sectors
Organic thermal oils in various industrial segments
Pharmaceutical
Chemical
Food Industry
Textile
Plastics
and other industrial sectors...
The fluid must not contain abrasive particles or materials that could chemically attack the pump components.
Model Nomenclature
Understand the FBOT pump technical designation
FB Bombas brand
Thermal Oil (application)
Discharge flange diameter (mm)
Rotor nominal diameter (mm)
Example: FBOT 32-160 = Thermal oil pump, DN32 discharge, Ø160mm impeller
Companies that Trust FB Bombas
Major industries choose FB Bombas for their critical operations
Need help specifying?
Our engineering team is ready to size the ideal FBOT pump for your thermal oil system. Sizes from DN 25 to DN 300.