Horizontal multi-stage pump (BB3)

Description：

The BB3 horizontal multistage pump is an axially split, between-bearings centrifugal pump developed for high-head, high-pressure and continuous-duty services. It normally incorporates three or more impeller stages to provide progressive pressure increase for pipeline transfer, water injection and demanding process applications.

The impellers may be arranged back-to-back or symmetrically to balance axial thrust. Double-volute or symmetrical diffuser passages help reduce radial loads and improve rotor stability. A double-suction first-stage impeller can be provided for low-NPSH services to improve suction performance and reduce cavitation risk.

Its horizontally split casing allows inspection of the rotor, impellers, seals and bearings without normally disconnecting the suction and discharge piping. The pump is suitable for refinery, petrochemical, offshore and other critical high-pressure services and can be designed in accordance with API 610 and project-specific requirements.

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Performance

Flow rate: 10~3000m³/h
Lift:~2500m
Design pressure: 30MPa
Working temperature: -80℃~200℃
Maximum speed:~5000rpm

Materials used

Casing: Carbon steel, low-alloy steel, chrome-moly steel, 304/316 stainless steel, duplex stainless steel or special alloys
Impellers: Stainless steel, martensitic stainless steel, duplex stainless steel or corrosion-resistant alloys
Shaft: High-strength alloy steel, stainless steel, precipitation-hardening stainless steel or duplex stainless steel
Casing wear rings: Stainless steel, wear-resistant alloy or surface-hardened material
Shaft sleeves: Stainless steel, hardened stainless steel or wear- and corrosion-resistant alloy
Bearings: Rolling-element or sleeve bearings, with optional forced-lubrication system
Mechanical seals: Single, dual or tandem seals, with optional API 682 seal plans
Gaskets and secondary seals: Graphite, PTFE or other media- and temperature-compatible materials

Wetted materials can be customized to comply with NACE, API or project specifications.

Scope of Application

·Oil refining: High-pressure process transfer, boiler feed and circulation services ·Petrochemical plants: Hydrocarbons, chemical feedstocks and high-pressure process liquids ·Oil pipelines: Long-distance transfer and boosting of crude oil and refined products ·Offshore platforms: Water injection, process-water transfer and utility services ·Oilfields: High-pressure water injection and production support systems ·Coal chemical plants: High-pressure grey water and process-water transfer ·Power generation: Boiler feed, condensate boosting and high-pressure circulation ·Desalination: High-pressure feed for reverse-osmosis systems `Industrial water supply: Long-distance and high-pressure water transfer

Structure

Axially split casing for convenient inspection and maintenance
Between-bearings rotor arrangement for multistage, high-pressure duty
Three or more impeller stages for progressive pressure development
Back-to-back or symmetrical impeller arrangement for axial-thrust balance
Double-volute or symmetrical passages for reduced radial loading
Optional double-suction first-stage impeller for improved NPSH performance
Renewable wear rings for leakage control and component protection
Statically and dynamically balanced impellers and rotor assembly
Suction and discharge nozzles generally located in the lower casing
Optional API mechanical seals, lubrication system and condition monitoring
Electric-motor, steam-turbine or customized driver options

Performance parameters

Parameter	Range
Capacity	10–3000 m³/h
Head	Up to approximately 2500 m
Design pressure	Up to 30 MPa
Operating temperature	-80 to 200°C
Maximum speed	Approximately 5000 rpm
Number of stages	Three or more
Configuration	Horizontal, axially split, between bearings
Design standard	API 610 or project standard
Shaft sealing	Mechanical seal; API 682 plans available
Driver	Electric motor, steam turbine or customized driver