Shaft lateral analysis

 

Wet critical speed is defined as the rotor critical speed calculated considering the additional support and damping produced by the action of the pumped liquid within internal running clearances at the operating conditions and allowing for stiffness and damping within the bearings.

 

Depending on pump design, the first or second wet lateral critical speed of multi-stage and high speed pumps can coincide with the operating speed, particularly as internal clearances increase with wear. A lateral analysis can predict if this coincidence is likely and whether the resulting vibration will be acceptable.

Lateral analysis and the assessments of results as per the requirements of API 610, annex I, is carried out at our laboratory.