API610 BB3 Between Bearings Axially Split Multistage Centrifugal Pump

Rotor:

Impellors are back to back symmetrically arranged so that axial thrust is reduced and automatically balanced, bearings loading is also reduced. 

First impellor can be double suction for large flow and low NPSHa duties, and minimizes axial thrust.

Fine casting of impellor with excellent hydraulic performance is anti-cavitation and high efficiency. 

Rotor part can be operated in CW or CCW asper requirement.

Shaft:

Multi-diameter shaft is easy for assembling, and tapered shaft extention easy for removal of coupling, impellors and bearings. 

Bigger shaft diameter ensures rotor completion with good rigidity, small deflection and enough seals ring clearance.

Double volute casing:

Fine casting liquid channel makes liquid passage area larger and radial force auto-balanced, greatly reduced shaft deformation and bearing loading.

Liquid channel is symmetrically arranged so that radial force is automatically balanced. 

Mechanical seal:

According to API682 with different flushing and cooling plan based on working conditions and liquid situation. 

Bearings:

Two ways of bearings arrangement:

--Sliding bearings for radial, angualr contact ball bearings for balancing residual axial thrust, which keeps rotor parts maximum strength.   

--Rolling radial and thrust bearings facilitate radial force and axial thrust borne by different bearings, so that bearings service life is greatly prolonged.

Bearings are self-lubrication or forced lubrication asper shaft power.

Bearing housing is cooled by fan or ribs for high temperature duty.

Monitoring devices:

According to API670, instruments for bearings, shaft and mechanical seal can be monitored for speed, vibration, temperature, axial displacement and sealing leakage. 

Driving engine:

Common motor, VSD motor, diesel engine or steamed turbine available, for dry or wet working duties.  

Auxiliary devices asper requirement:

Hydraulic coupling for soft-starting. 

Gear box or clutch etc.

Heating cable and insulation casing.

Easy maintenance: 

Disassemble pump without moving inlet and outlet pipe line.

Integral rotor completion is lifted fit-in.

                                                  API610 Centrifugal Pumps

**Some of above types of pumps does not meet all the requirements of API610 standard. 

**API610 standard suggests that, further or differing requirements can be needed for individual applications. The vendor is necessary to identify any variations from API610 standard and provide details for alternative equipment or engineering solutions.