Estimados:
Quisiera comentarles que la turbina puesta en marcha el año pasado está funcionando. hace una
semana tuvimos una vibración en la misma y tuvimos que cambiar los cojinetes (provistos como
repuesto por ustedes) de esta situación surgen algunas consultas que quisiéramos transmitirles:
1) Cuanto es el espacio libre que debe existir entre el eje de la turbina y el cojinete, este valor es
muy importante ya que define el espesor de la capa de aceite que recubre el eje de la turbina.
2) Cual es la temperatura de aceite a la que debe funcionar el sistema de lubricación.
3) De que aleación es el cojinete, más específicamente la película que está entre el cuerpo del
cojinete y el eje de la turbina.
4) Percibimos que el aceite contiene una gran cantidad de agua y estamos buscando el lugar
donde posiblemente ingresa agua al sistema. Una posibilidad es en la zona de vapor de sellos ya
que allí vemos que sale mucho vapor que se condensa.
Saludos y aguardamos su respuesta
Dear:
I would like to tell you that the turbine commissioning last year is working. But a week ago we had
a vibration in it and we had to change the bearings (supplied as a spare for you) in this situation
raises some questions we would like to convey:
1) How is the free space (gap) that must exist between the turbine shaft and the bearing, this
value is very important because it defines the thickness of the oil layer covering the turbine
shaft? ._
2) What is the temperature range at which the lubrication system should work?
3) What is the bearing alloy ?. More specifically the film which is between the bearing body and
the turbine shaft.
4) We perceive that the oil contains a lot of water. We are looking for the place where water may
enter the system. One possibility is in the vapor seals because there we see coming out much
steam condenses.
Greetings and await your response
From: Kessels Engineering Works Pvt Ltd
Dear Mr. Nelson,
Kindly note our point wise reply:
1. The free space (gap) between turbine shaft and the bearing is normally 0.14mm (minimum) and 0.20 mm
(maximum) in stationary condition.
2. Bearing oil temp. at inlet is to be around 45C (Maximum) and at outlet it is be around 60C (Maximum).
3. The bearing material of the surface in contact with turbine shaft in White Metal/Babbit, Grade -87.
4. About the water entry in oil, it is due to ingress of moisture/steam condensate in the oil.
a) It is advisable to check thoroughness of vapour escaping route through breathers/vent lines and
possibly you may go for next higher size of pipe although the lines provided are enough to take care of
normal escape of vapour.
b) It is also worth to provide a centrifuging machine for oil circuit that helps in separating moisture &
sludge from oil and can be operated ON LINE as well as OFF LINE. If you are interested, we can help
you by providing offer for this from our vendor.
J. C. Sharman
On 30 June 2015 at 19:32, Nelson Aguilar <naguilar@tapebicua.com.ar> wrote:
Dear Sethi/ Ajay/ :
I would like to tell you that the turbine commissioning last year is
working. But a week ago we had a vibration in it and we had to change
the bearings (supplied as a spare for you) in this situation raises some
questions we would like to convey:
1) How is the free space (gap) that must exist between the turbine shaft
and the bearing, this value is very important because it defines the
thickness of the oil layer covering the turbine shaft? ._
2) What is the temperature range at which the lubrication system should
work?
3) What is the bearing alloy ?. More specifically the film which is
between the bearing body and the turbine shaft.
4) We perceive that the oil contains a lot of water. We are looking for the
place where water may enter the system. One possibility is in the vapor
seals because there we see coming out much steam condenses.
Greetings and await your respons
--
Nelson Aguilar.
Dpto. Compras
Grupo Tapebicua.
Realizarse realizarse realizarse
