Horizontal segmental multi-stage pump (BB4)

Description：

The API 610 BB4 horizontal segmental multistage centrifugal pump is a between-bearings, radially split, single-casing multistage pump designed for high-head, medium-to-high-pressure and continuous-duty applications. Its suction casing, stage casings and discharge casing are assembled with high-strength tie bolts. Multiple impellers operate in series to increase the liquid pressure stage by stage.

The pump can be engineered in accordance with API 610 and project-specific requirements. It features a compact construction, high hydraulic efficiency, stable operation, strong pressure capability and convenient maintenance. Materials, mechanical seals, bearing arrangements and seal-support systems can be selected according to the liquid composition, temperature, suction pressure and corrosiveness.

Compared with a BB5 double-casing pump, the BB4 design is more compact and generally more economical to manufacture and maintain when the operating pressure and temperature remain within the acceptable limits of a single-casing pump.

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Performance

Flow rate:~900m³/h
Lift:~1800m
Design pressure: 27MPa
Working temperature: -20℃~+200℃

Materials used

Component	Typical materials
Suction, stage and discharge casings	Carbon steel, chrome steel, 12% chrome steel, austenitic stainless steel or duplex stainless steel
Impellers	Cast steel, stainless steel, duplex or super-duplex stainless steel
Shaft	High-strength alloy steel, martensitic stainless steel or duplex stainless steel
Diffusers	Cast steel, stainless steel or corrosion-resistant alloy
Shaft sleeves	Hardened stainless steel, duplex stainless steel or wear-resistant alloy
Wear rings	Stainless steel, hardened stainless steel or wear-resistant alloy
Fasteners	High-strength alloy steel or stainless steel
Gaskets	Spiral-wound, metal-jacketed or project-specified materials

For seawater, chloride-containing or highly corrosive liquids, 316/316L, 2205, 2507 or other corrosion-resistant alloys are available. Final material selection shall be based on the liquid analysis, corrosion allowance and project specification.

Scope of Application

·High-pressure process service in refineries ·Petrochemical and coal-chemical plants ·Boiler-feed and condensate-water systems ·High-pressure water supply in power plants ·Oilfield water injection and pressure boosting ·Crude-oil and refined-product pipelines ·High-pressure chemical circulation and feed service ·Reverse-osmosis and desalination systems ·Mine dewatering and industrial boosting ·Other continuous-duty, high-head services For correct pump selection, the customer should provide the liquid name, density, viscosity, temperature, corrosiveness, solids content, required flow, total head, suction pressure, NPSH available and hazardous-area classification.

Structure

Horizontal, between-bearings, radially split, segmental, multistage, single-casing API 610 BB4 configuration.
Series-arranged impellers generate high total differential head.
Axial thrust may be controlled by a balance disc, balance drum or combined balancing device.
Stage casings are connected by high-strength tie bolts.
Diffuser-type hydraulic passages provide stable pressure recovery.
Bearings at both ends help control shaft deflection and rotor vibration.
Rolling-element, sleeve or pressure-lubricated bearings are available.
API 682 single, dual or tandem mechanical seals can be supplied.
API seal-flushing, cooling and barrier/buffer-fluid systems are available.
Flexible coupling and common baseplate arrangement.
Optional vibration, bearing-temperature and pressure-monitoring connections.

Performance parameters

Parameter	Specification
Pump type	API 610 BB4 horizontal segmental multistage centrifugal pump
Capacity	To be confirmed by model selection, m³/h
Total head	To be confirmed by model selection, m
Operating temperature	Depending on materials, seals and project requirements
Suction pressure	Subject to casing design and operating conditions
Design pressure	According to project specification
Speed	1,450/1,750/2,900/3,500 rpm or customized
Number of stages	Selected according to required flow and head
Nozzle size	According to pump model, DN
Efficiency	According to the final certified performance curve
NPSH required	According to the final selection curve
Shaft seal	API 682 mechanical seal or project-specified arrangement
Lubrication	Oil-ring, oil-mist or forced lubrication
Driver	Electric motor, steam turbine or other driver
Design standard	API 610 and project specification

Actual performance depends on the number of stages, impeller diameter, speed and liquid properties. Final selection requires hydraulic calculation, NPSH verification, axial-thrust calculation, rotor-dynamic evaluation and material confirmation.