dont know the reason for vibration in steam turbine
dont know the reason for vibration in steam turbine
(OP)
In our 30MW steam turbine vibration monitoring system showing vibration reading more than normal level but within trip limit some times.but it is not showing continuously more than normal level reading but not in regular interval also.but we have checked all electrical connection related to vibration monitoring system,all are ok,even we have separated all earthing connection of vibration monitoring system it is now given separately.but still we cant find out the reason really where it is?whether vibration really there in turbine or electrical problem?if it is there in turbine means why it is not coming continuously?





RE: dont know the reason for vibration in steam turbine
RE: dont know the reason for vibration in steam turbine
Johnny Pellin
RE: dont know the reason for vibration in steam turbine
what are the possibilities of the vibration in the gearbox(internal&external)?.
this vibration is not coming continuously,why?
RE: dont know the reason for vibration in steam turbine
You need to tell us the speeds (input and output) of the gearbox and other critical details about the service in order to get a meaningful response. What is the gear configuration? What types of bearings are used? What is the driven machine? How do the load and speed vary over time? What types of couplings are used?
Johnny Pellin
RE: dont know the reason for vibration in steam turbine
RE: dont know the reason for vibration in steam turbine
RE: dont know the reason for vibration in steam turbine
RE: dont know the reason for vibration in steam turbine
RE: dont know the reason for vibration in steam turbine
The data provided does not indicate there is a fault in the gearbox, unless it has antifriction (rolling element) bearings.
Turbine speed: 7079 rpm = cpm
Problem Frequency: 88 Hz = 5280 cpm
Generator Speed: 1500 rpm = cpm
So if gearbox output shaft has AF bearings, then 5280 cpm could be a bearing fault frequency; need to calculate from bearing geometry. Another possibility is subsynchronous frequency in turbine rotor (balance resonance).
Walt
RE: dont know the reason for vibration in steam turbine
I think it will reduce gear box vibration.is it?
has anyone used anti foaming additives in lube oil in their power plant for foaming problem?
RE: dont know the reason for vibration in steam turbine
If you oil was foaming, you'd have more issues than what you have described, such as air build up in filter housings, pump binding, erratic/unsteady oil pressure. Look for these signs first before addressing a foaming issue.
If the oil is indeed foaming, oil doesn't foam without some other contaminants being present. So you need to look at what kind of oil filtering/cleaning system do you have? Do you do continous or periodic clean up with a centrifugal deleval, or do you do batch oil changes with heated settling tanks? Oil filtering? Do you do reguarly oil analysis? What viscosity of oil is being used ISO 32, 46?
RE: dont know the reason for vibration in steam turbine
but i dont have any problem like air build up in filter housings, pump binding, erratic/unsteady oil pressure.
we are having oil centrifuge pump for oil filtering.we are doing regular oil analysis every think is ok.but foaming is there.
for this vibration problem i have doubts on this foaming.am i right?