Shaft:
Sectional type of shaft reduces radial deviation and realized stable performance as well as easy maintenance.
The suitable shaft length keeps enough rigidity and improves critical speed to avoid resonance.
Impellor:
There is balancing hole to balance axial force.
Replaceable special seals ring at both front and rear plate to prevent foreign matters sink into seals ring gaps, so that improves service life of impellor and seals ring.
Axial position of impellor is adjusted by upper part of bearing or adjusting nut of pump coupling.
Bearing:
Middle guide bearings effectively prevent large particles entering into pump inside and give support to shaft, and reduces deflection of shaft so as to reduce pump vibration.
Pump thrust bearing bears pump residual axial thrust and rotor weight.
Coupling:
Sleeve coupling has high radial concentricity.
Good rigidity and small vibratoin.
Convenient assembling and disassembling.
API610 Centrifugal Pumps
| Overhung (OH) | Flexibly coupled | Horizontal | Foot-mounted | OH1 |
| Horizontal | Centerline-supported | OH2 | ||
| Vertical | In-line with bearing bracket | OH3 | ||
| Rigidly coupled | Vertical | In-line | OH4 | |
| Between bearings (BB) | 1 & 2 stages | Axially split | Foot-mounted | BB1-A |
| Near-centerline mounted | BB1-B | |||
| Radially split | Centerline-supported | BB2 | ||
| Multistage | Axially split | Near-centerline supported | BB3 | |
| Radially split | Single casing | BB4 | ||
| Double casing | BB5 | |||
| Vertically suspended (VS) | Single casing | Discharge through column | -- | VS1 |
| Separate discharge pipe | Line shaft | VS4 | ||
| Cantilever shaft | VS5 | |||
| Double casing | Radially split | -- | VS6 |
**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.
