During shutdown of Steam Turbine,How do we cross the
critical speed?

Answer Posted / kaizad

As soon as steam stop valves are closed there is no control on coast down speed of turbine unless vacuum break valve of condenser is opened. Normally it takes approximately 55mins to coast down from 3000rpm to 20-30rpm barring gear speed. We keep watch on all turbo visors parameters in such times

Is This Answer Correct ?    16 Yes 4 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

How to calculate boiler capacity? I have 1 Autoclave, Which has to use for AAC block. Dimension for this Autoclave is - 13 Meter Length & 2.2 Meter Diameter.

1822


dear sir i have completed one year post diploma certificate in thermal power engineering from national power training institute durgapur ...plz suggest me for power sector job

2070


What is LB-SR.

2481


what is restricted earth fault explain in details

1622


why airtel use + 24 volts and other operators use -48 volt

2106






some one can tell me how residual type excitation is provided through transformers to an AC generator without any battery or PMG&excitor

1948


How do you consider that you can improve and what assistance do you need to achieve this

1332


Qatar Fertiliser Company (QAFCO) Shortlisted me for interview (got the intel from my source) for Field Operator- Utilities post. Please let me know what kind of questions they asked? ... this position requires 5 years of experience in Power Plant and background Diploma in Electrical/ Mech. ... my Background is Electrical and I am a sub Assistant Engineer (Operation) at a private HFO based Power plant... PS: Please Let me know what preparation should I take to obtain the Interview which will be take place In Bangladesh soon

1765


explain how the third harmonic content of the magnetising current affects transformer design

2770


what is the trip circuit supervision in an electrical meaning?

1439


Which will have more strain energy 1.Spring 2.Circular disc 3.Solid square plate.

1880


what's the moog valve

1050


How We Calibrate the vaccum transmitter?

1465


procedure of how to generate power in solar plant.

1373


DCS marshaling Cabinet Power supply can be replace during plant running time? Answer Yes it is possible. I am talking about the controller and cards power supply modules. They are always redundant and connected through diode so that if one power supply fails the other can take the charge immediately.so it is possible to replace one of them in running plant if the other one is healthy. MY question is how switching done.

511