BB5-Type Axially Split, Double Casing, Multistage Pump

BB5 is a special type of centrifugal pump defined in API 610 standard, with the full name of 'Axially Split, Double Casing, Multistage Between Bearing Pump' (axially split, double casing, multi-stage between bearing pump). It is an upgraded version of BB3 pump, specifically designed for ultra-high pressure, high temperature and high reliability working conditions, and is commonly found in demanding industrial fields such as petrochemicals and energy.

Features:

(1) Structural Design 

Axial sectioning (horizontal split): The pump casing is split horizontally along the axis (similar to BB3), facilitating maintenance.

Double casing: 

Outer cylinder: It withstands the high pressure of the system and is directly connected to the pipeline flange.

Inner pump core: It contains core components such as the impeller and guide vanes, and can be completely withdrawn for maintenance (similar to BB2). 

Multi-stage impeller: Usually arranged symmetrically in opposite pairs (Balanced Opposed), to counteract axial force.

Both ends are supported by bearings: The rotor has high stability and is suitable for high rotational speeds (up to 6000 rpm). 

(2) Performance Advantage 

Ultra-high pressure: The design pressure can reach over 25 MPa (far exceeding the 10 MPa of BB3).

High temperature adaptability: It can handle high-temperature media at 400°C or above (such as hot oil, synthetic gas).

Zero leakage safety: It adopts the dual mechanical seal or gas barrier system in accordance with API 682 standards.

Maintenance convenience: No need to dismantle the inlet and outlet pipelines, simply lift out the inner pump core for maintenance.

Scope of Application:
Suitable for petroleum extraction, petroleum refining industry, petrochemical industry, coal chemical industry, power industry, mining and metallurgy industry, offshore platforms, etc.;
Typical applications include hydrogenation feed pumps and hydraulic turbines in the petroleum refining industry, oilfield water injection pumps in petroleum extraction, coke and phosphorus removal pumps in the steel coking industry, high-pressure boiler feedwater pumps in the chemical and power industries, and descaling pumps in the metallurgical industry.