Відео

@@shraddhadas6748 ok

@@artistyacts not tube it is regenerative type APH

Ok

Please watch the video clearly I have mentioned all things in this video.

Trip oil is supplied at the above of piston in order to press the two part of piston against spring between them to work as one unit .

As auxiliary trip oil pr between OSRD & OSTV is zero ,if you release the 1 st valve without pressing the 3rd valve ,turbine will trip.

Ist valve should not be released until all process completed

For more details please watch the video clearly ,I have mentioned all things

No sir,i mean what if we press the 3rd v/v at first..here in our plant sir log are saying first we need to check the operation of 3rd v/v,then only we need to proceed for the entire said process of yours,else if the 3rd v/v didn't work after we press the 1st v/v then we're struck.

@@artistyacts 3rd valve is used to reset the OSRD .If you press the 3rd valve Control oil will flowto aux trip line between OSRD &OSTV.If you press the 1st valve without checking the 3rd valve ,then After testing of OSTV ,it may create problem if control oil does not flow .

Dhanyawad

Decrease ho jayega

Thanks

In speed control mode Dn/Dt plays an important role when speed less than 2850 rpm.

@@rahulsirclasses1987 exactly Sir. That means NR blocking should happen when we want to cross 2850, means Nact<2850 and TSC is faulty.

I will make a video on this topic

@@pratimbandyopadhyay4726 suction pr - 150mmwc Outlet pr 20-30 mmwc Suction pr and discharge pr depends on load

Thanks

Yes

@@trozanhorse7532 Please check wheather Vacuum breaker valve is oil operated or air operated? And also checked is it pressure to open or pressure to close?

@@trozanhorse7532 You may also check the condition of solenoid valve

Thanks for watching

It may be due to non proper soaking time . Turbine tripped on HPC/IPC top / bottom Temp defference

If temp difference increases you may open MAL 81 gland steam drain valve

Thnk u sir.

@@shashankprasad510 yes

@@sunsinecose Thanks

SAFETY VALVE IN CRH line :- 1 on each side ( LEFT + RIGHT ) In HRH line :- 2 on each side ( Normal safety valve + ERV) The pr. for popping of ERV is set less than that of normal SV. Pr set for ERV :- 48 kg/ cm2 For normal SV :- 49.5 Kg/ cm2 Both valves are only for indication purpose

ERV is given on only MS and HRH line

​@@rahulsirclasses1987Sir in our 150 MW plant we have one safety valve on CRH & two on HRH ,can you tell the reason for the same in your case 2 on each left & right why???

​@@rahulsirclasses1987 why 2 each on HRH

@@manasdas740 In HRH two Safety valve are given .Pr set for popping of SV is less in HRH as compared to CRH .The main reason is that In case of pop up ,SV of HRH should pop first in order to avoid the RH tube leakage due to starvation

Ok , thanks for suggestions

@@rahulsirclasses1987 thanks sir

It may depend on c&I logic.

SIR IN 250 MW BHEL TURBINE CONDENSER TUBES ARE MADE UP OF STAINLESS STEEL, WE HAVE VERY POOR VACUUM, DO YOU SUGGEST CHEMICAL CLEANING OF TUBES .WHAT IS YOUR EXPERIENCE

​@@vibhanshu1 It seems that the vacuum improves after acid cleaning of condenser tubes .some times air pressure cleaning is also done

It is a C&I related topic ,As I am a mechanical engineer not too much about this topic.I have to study before making video on this topic .

After tripping off the unit ,first cut out the vacuum pump and then isolate the gland steam supply when the vacuum pr reaches 0.9 mmwc absolute pr . When HP shaft temp reaches 120°C close the barring gear valve . For the force cooling procedure I have already uploaded a video .please watch

Definitely I will make video on this topic

Thanks

Hindi me hi bolte h for clear understanding

Yes I will make

Thanks

Yes

Post purge fan trip condition 1. MFT reset 2.Purging completed ,5 min complete 3.No oil gun in service means all LONV, HONV are closed. 4.Furnace pr very high or very low 5.Air flow> 30% but less than 40%

High Furnace pr or Low furnace pr. in both conditions Boiler tripped

Thanks

Thanks

Thanks. For Any query, comment

For purging the boiler

For X1,X2,X3 Curve ,Three Temp are important.MS temp Before HPBP or HPSV, Mid wall Temp HPCV & MS saturation temp .

For opening of HPSV,IPCV and rolling of turbine We have to see all three Temp

Temperature kitna hona chahiye ye kaise malum karenge , stop valve open ke liye temp deside jaise karenge

Photos are not available at this time .All are deleted .

HPS:- HP TURBINE SHAFT TEMPERATURE IPS:- IP TURBINE SHAFT TEMPERATURE

Fire resistant fluids ( FRF) is used in LP HPSU .It offers better fire protection than mineral oils because of the higher auto ignition temperature.Circulation fan is used only to maintain temperature around 46-50°C . A regeneration pump is used to maintain the oil properties. FRF oil , a synthetic fluid contents Tri-Xylenyl Phosphate Ester demonstrates best Fire Resistant properties . Phosphate Esters are highly hygroscopic (tendency to absorb water) in nature and the esterification process is reversible when Phosphate Esters come in contact with water. This is referred to as hydrolysis. The higher the water content and temperature, the faster the ester will break down by hydrolysis.

Circulation fans are not always in service,it will cut in at a certain temp and cut out after achieving high temp.

Thank you very much sir

Sir, one more question: In HPBP OSU, there's no need for recirculation pump. I guess maybe due to change in oil property. My question is why different type of oils used in HPBP and LPBP when the use of both will be during same time?

@@handsomehardiksinh HPBP OSU is BHEL made but LPBP HPSU is German technology

Thanks

@@shashankprasad510 conductivity:- less than 1 DO :- max 10

@@Mayank14755 I will try to make video frequently

After synchronisation when load cones to 40% trip device to be on .On means untrimmed .

Upto 40% load trim device is off .It means IP CV is opened according to load .When IPCV opened to 80% then the Trim device to be untrimmed so that IPCV to opened 100%

HP-IP trim device open means untrimming of IPCV

Yes this is my actual doubt, now cleared ​@@rahulsirclasses1987

This is a general procedure to force cooling the turbine

Empirical value

@@porun1985 ok

Thanks

500 MW

Thanks

Ok

Yes sir