|
Electric Pumps and Turbine-driven Pumps
Electric Pumps and Turbine-driven Pumps
The measurement is limited to that of physical quantity sets which can be used to define and evaluate unambiguously the vibration condition of the whole pumping unit with the drive, clutch and gear.
Such measurement is carried out in order to:
- Locate the sources of vibrations and determine their causes,
- Assess the vibration degree: current condition compared to the history of the pump,
- Collect data to make a complete analysis of the vibration state: current condition compared to the history of the pump,
- Interpret the vibration state observed: current condition compared to the history of the pump,
- Make a diagnosis regarding the technical state of the turbo set: current condition compared to the history of the pump,
- Make a forecast about the future technical state: current condition compared to the history of the machine,
- The measurement of the vibration time and the scope of repair serve as a basis for determining the turbine’s state.
Thus, the repair procedure can be planned according to the actual technical condition of the pump. Additional advantage of this approach is that it is possible to obtain proper spare parts beforehand. As a result, the time and the scope of the repair can be reduced to a minimum.
 |
| Measurement of an electric pump’s vibration by means of a movable measuring apparatus |
Type and Scope of Measurement :
Measurement of an operating turbine set’s vibrations is conducted with:
- a monitoring unit mounted permanently: the so-called turbine set monitoring system,
- sensors of a stationary monitoring system mounted on the pump set,
- a measuring system installed by us for a longer period of time,
- a measuring system installed by us for a period during which the measurement is carried out,
- a portable measuring apparatus.
In each of the above cases, if necessary, the measuring system can be supplemented with sensors essential for obtaining the best description of the pump set’s technical condition.
The scope of the measurement we conduct depends on requirements, objectives and technical problems discovered during the operation of the device inspected.
According as the scope of the measurement, we are able to indicate and inspect the following basic faults of the electric and turbine-driven pumps:
- Flaws of the rotating system balance,
- Flaws of alignment,
- Seizures in seals,
- Looseness in w bearing supports,
- Flaws of the arrangement of bearing supports,
- Misalignment of the rotor in the engine stator,
- Axial displacement of the rotor in relation to the engine’s stator,
- Misalignment of the pump’s rotor or the engine with the pump, gear and clutch.
We also carry out measurements geared to wards:
- Preparing the scope of repair work: selection of elements which must be inspected in the course of a repair,
- Assessing the vibration condition after the completion of the repair,
- Determining the frequency and the form of free vibration of electric and turbine-driven pumps elements (eg. blade, shaft bossing, pump’s cover, elements of bearings and their supports etc.) and machines’ units (e.g. pipelines, gates, support system, etc.)
- Measuring and assessing the influence of the flowing water on the vibration condition of electric and turbine-driven pumps (influence of the hydraulic input),
- Assessing the influence of electromagnetic inputs of the engine on the dynamic state of the electric and turbine-driven pumps,
- Detecting any possible looseness of the sheet packs of the engine’s rotor while it is spinning,
- Searching for causes of instability of the rotating system’s motion.
We indicate loosenings or any possibility of looseness in the clutch plate mounting on the shaft of the rotor. Measurement is carried out when the rotor is disabled, for example, during a repair of the unit. For this purpose, we use a method developed by the VIBROPOMIAR Company on the basis of modal analysis.
Moreover, we determine the ranges of actual critical velocities of the electric and turbine-driven pump’s rotors.
We also establish the frequencies of free vibrations of the electric and turbine-driven pump’s main elements.
In this way we provide a team operating the water power plants with the knowledge of what ranges of inducement frequencies are dangerous for a given construction joint. Such measurement is aimed at improving the safety of operation.
The VIBROPOMIAR Company also maintains a measuring team which responds to emergencies. It conducts limited measurement consisting of the evaluation of the rotating system’s vibration condition. This measurement serves the purpose of assessing fitness of a rotating system for further operation, making it possible to evaluate its technical condition .
|
