FHB(BB5)

The API BB5(model FHB) pump is a horizontally mounted, radially split, multistage between-bearings centrifugal pump featuring a distinctive double-casing (barrel) construction designed to API 610 / ISO 13709 standards. The defining architecture consists of an inner cartridge assembly—which houses the rotor and diffusers or volute stages—enclosed within an outer barrel casing. This configuration allows the complete inner element to be removed without disturbing the suction and discharge piping or the driver, significantly simplifying maintenance on high-pressure services. The BB5 is essentially a BB3 (volute) or BB4 (diffuser) type pump inserted inside a secondary radially split barrel casing.

These pumps are engineered specifically for the most extreme operating conditions where standard single-casing pumps cannot safely contain the process fluid. API 610 specifies BB5 construction for pumping temperatures of 200°C or higher, liquids with relative density below 0.7. Typical applications include high-pressure water injection for enhanced oil recovery, hydrocracker and hydrotreater charge services, boiler feed water, liquid gas transfer, and carbon capture utilization and storage (CCUS) processes. The double-casing design provides superior containment integrity for toxic, flammable, or low-specific-gravity fluids.

Technically, the BB5 pump achieves axial thrust balance through either opposed impeller arrangements or a balance drum, while radial loads are managed by diffuser stages or double-volute inner casings. Bearings typically consist of heavy-duty sleeve journal bearings and tilting-pad thrust bearings with pressurized oil lubrication, though rolling element options exist for smaller units. The pump is fully compliant with API 682 seal chambers and accommodates cartridge mechanical seals. Performance envelopes reach capacities up to 1,000 m³/h (4,400 US gpm), heads up to 3,200 meters (10,500 ft), pressures up to 400 bar (5,800 psi), and temperatures up to 450°C (840°F). Available in materials ranging from carbon steel to duplex stainless steel, the BB5 represents the standard solution for the most demanding high-energy pumping duties.

Technical Parameters

DESIGN STANDARD	API610
FLOW RATE	Up to 1000 m³/h
HEAD	Up to 3200 m
APPLIED TEMPERATURE	-80~450℃
MAX PRESSURE	40Mpa
MAX Speed	6000rpm
General Description	BB5 pump is designed and manufactured according to API610 Standard.

Product Features

Double-Casing Barrel Design – Outer barrel casing plus inner cartridge assembly; the inner element can be removed without disturbing the outer barrel or main piping, greatly simplifying maintenance.
Very High-Pressure Capability – Barrel construction withstands extreme pressures and temperatures, making it the preferred choice for the most severe services.
Multistage, Radially Split Inner Casing – Multiple stages in series deliver high head at moderate-to-high flow; inner casing is vertically split for easy rotor access.
Balanced Axial Thrust – Opposed or back-to-back impeller arrangement with balance drum or balance disc minimizes axial loads and extends bearing life.
Robust Rotor Dynamics – Between-bearings support with rigid shaft ensures low vibration and reliable continuous operation.
Enhanced Sealing – API 682 compliant cartridge mechanical seals with customizable flush plans; optional dual seals for toxic, flammable, or high-pressure fluids.
Thermal Stability – Centerline-mounted casing support minimizes thermal distortion and nozzle misalignment at elevated temperatures.
Standards Compliant – Fully compliant with API 610 / ISO 13709 heavy-duty process pump requirements.