Thermal oil pump FBOT Series

The maximum temperature of the FBOT series is 350 °C (MTEC-16/00). Maximum discharge pressure varies with temperature, as shown in Figure 1. Selection must consider the thermal oil and the project operating point.

No. The series catalogue describes the FBOT as developed to pump organic thermal oils at high temperature, eliminating the need for external cooling. The bearing frame sealing has a dual safety system: graphite packing (MTEC-16/00, item 2.3) forms the first stage, in contact with the pumped thermal oil, and the mechanical seal runs immersed in oil. Confirm the sealing configuration of the supplied pump with engineering.

Sealing with graphite packing and a mechanical seal. The configuration and maintenance instructions must match the supplied equipment.

FBOT organic thermal oil applications include pharmaceutical, chemical, food, textile and plastics industries (MTEC-16/00). The fluid must be compatible with the pump materials. The series catalogue also includes asphalt plants. In all these sectors, the pump circulates the heating thermal oil, not the process product.

The series was developed for organic thermal oils. According to the manual, the fluid must not contain abrasive particles or substances that chemically attack pump components. Provide the product and its properties to engineering to confirm selection.

The catalogue contains 35 models: 25 with dimensions in Table 5, grouped into 7 discharge diameters from DN25 to DN100, and 10 large-capacity models from DN150 to DN300 with dimensions on request. Each of the 25 dimensioned models identifies its bearing group in the specification.

Under the designation in manual MTEC-16/00, the code FBOT 32-160 combines the brand (FB Bombas), the model (OT, for thermal oil, “óleo térmico” in Portuguese), the nominal diameter of the discharge flange (32 mm) and the nominal impeller diameter (160 mm). The .1 suffix, where present, is part of the variant code in Table 5. When requesting spare parts, documentation or a replacement, provide the complete code and the nameplate data.

The FBOT is a centrifugal pump developed for organic thermal oils, the heat-transfer fluid of heating circuits, and requires a fluid free of abrasive particles and of materials that chemically attack pump components (MTEC-16/00). For oils in general, the FBE series catalogue lists external gear pumps for applications such as diesel oil, crude oil, greases, asphalt, lubrication systems and oil burners. The choice between the series depends on the fluid, viscosity, temperature and operating point.

FBOT is the FB Bombas centrifugal pump line developed for pumping organic thermal oils. FBOT has back-pull-out construction, a closed radial impeller, graphite packing and an oil-immersed mechanical seal (MTEC-16/00). The catalogue lets you select the family by service and open the specification for each model code.

Replacement requires comparing the operating point, fluid, temperatures, flanges, installation dimensions, baseplate and drive. The same DN or a similar code does not confirm interchangeability. Send the installed pump drawing and data to engineering to assess the proposed supply.

The series temperature limit is 350 °C (MTEC-16/00). Selection must also comply with suction pressure, the discharge-pressure-versus-temperature curve and the oil properties. Catalogue limits do not imply that every maximum can occur simultaneously.

To assess an FBOT for a nitrogen-pressurized circuit, provide suction and discharge pressures, temperature, thermal oil and start-up conditions. Engineering must confirm the applicable configuration and limits in the technical quotation. When replacing an installed pump, also provide its complete identification code.

For a purchase requiring ASME B73.1, request documentary confirmation of the quoted configuration from engineering. FBOT has back-pull-out construction and flange references to ANSI B16.42 and DIN EN 1092-2 PN16 (MTEC-16/00); these references do not replace verification of the supply’s applicable standards.

Manual MTEC-16/00 (§2.3) describes the seal immersed in bearing housing oil; the current catalogue (page 2) refers to the thermal oil itself. Confirm your pump configuration and the corresponding lubrication and maintenance instructions with engineering.

Codes with the .1 suffix appear in Table 5 (MTEC-16/00). Keep the complete identification when checking dimensions, documentation and spare parts. Confirm the supplied configuration and its limits with engineering, considering circuit pressures, temperature and start-up conditions.

Use the series catalogue and manual MTEC-16/00 to assess the application. Ask engineering to identify the quoted model and configuration, together with the documents required by the project. When procurement requires Petrobras supplier registration, check the CRC presented, its validity and the product or service families it covers. The evidence must match the purchase requirements and the scope of supply.

An electric motor is among the FBOT drive accessories (MTEC-16/00). For a steam-turbine specification, submit the requirements to engineering to assess speed, coupling, loads and configuration. The catalogue manual does not provide general approval for every turbine drive.

Provide flow, total head, thermal oil type, temperature, suction pressure, speed and start-up conditions. If a pump is already installed, also send its code and drawing. Consult the technical manual at /en/technical-manuals/fbot and request a quotation with your process data.

FBOT has ANSI B16.42 150lbs or DIN EN 1092-2 PN16 flanges and part numbering according to DIN EN 24250 (MTEC-16/00). Its technical table states maximum temperature of 350 °C and maximum suction pressure of 10 bar. Discharge pressure depends on temperature as shown in Figure 1. Consult /en/technical-manuals/fbot.

The bearings are 6306 C4 and 6306 ZZ C4 WT for bearing frame 3 and 6308 C4 and 6308 ZZ C4 WT for bearing frame 4 (MTEC-16/00, Table 1). According to item 2.4, the bearing frame has 2 bearings: one runs submerged in oil and the other is shielded and grease-lubricated (parts 321.01 and 321.02 in the parts list). Each model with published dimensions identifies its bearing group in the specification.

Accessory options (MTEC-16/00) include ANSI B16.42 flanges, with DIN EN 1092-2 PN16 as an option; electric motor drive; a flexible coupling, with or without spacer, FB Bombas standard or from other manufacturers; an FB Bombas standard coupling guard in carbon steel or non-sparking material; and a U-shaped steel plate baseplate. The motor power reserve over the power required by the pump follows Table 2 of the manual: about 20% up to 2 cv (metric horsepower), with a minimum of 1.5 cv, 15% up to 20 cv and 10% above 20 cv. The series catalogue shows the FBOT motor-pump set on a baseplate (Fig. 1). The scope of each supply is defined in the quotation.

FB Bombas Engineering sets the maximum impeller peripheral speed by material (MTEC-16/00): cast iron up to 40 m/s, ductile iron and carbon steel up to 60 m/s and stainless steels up to 80 m/s. Peripheral speed is u = π × D × n / 60, with D in metres and n in rpm. By this calculation, a cast iron impeller at 3,500 rpm is limited to a diameter of about 218 mm; at 1,750 rpm, the same limit corresponds to about 436 mm. That is why speed and impeller material are defined together during selection.