Question 1. What Is A ‘fireplace Triangle’?
A fireplace triangle represents the three elements, which causes a fireplace in a combustible mixture. The three elements are gasoline, air and ignition.
Question 2. What Is Importance Or A ‘hood’ On A Gas Turbine?
During a gas turbine everyday walking condition, a hood affords:
Prevention of turbine excessive dB noise to outdoor areas.
Keeps the gasoline turbine easy from external dust.
Provides a draft for the gas leak to the exhaust via the hood fan.
During a gasoline turbine shutdown condition a hood provides:
Cooling the turbine body by way of manner of the hood fan.
During a hearth shutdown it facilitates to place out the fireplace with the aid of confining the fireplace extinguishers at the gas turbine.
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Question three. Why Do We Use ‘halon’ As A Fire Extinguisher In A Gas Turbine Hood?
Halon is saved in liquid form in a cylinder. When it is released in a hood at some point of the occurrence of the hearth, it discharges the halon in gasoline from. Halon does no longer act or react on electrical additives.
Question 4. What Is The Expansion From Of B.C.F?
The growth shape of B.F.C is Bromo chloro floride.
Question 5. In A Ruston Gas Turbine, Why Are There Two Halon Cylinders In Each Bank? How Do They Function?
The first bottle is the ‘first shot’ and the second one bottle is ‘Extended shot’. The first bottle discharges the Gallon into the hood through a 1’’ pipe in about 15 seconds, where because the extended bottle discharges the Halon thru a ¼’’ pipe for another ½’’hour period to preserve the inert atmosphere.
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Question 6. How Many Uv Detectors Are Installed In Solar, Ruston Tb-5000 And Ruston Ta-1750 Gas Turbine Hoods?
Solar fuel turbine hood: four UV detectors
Ruston TA1750 hood: four UV detectors
Ruston TB5000 hood: 12 UV detectors
Question 7. What Is Voting Logic Of Uv Detectors In Soar And Ruston Gas Turbines?
There are two vote casting logics, they are: 1 out of four UV s and a pair of out of 4 UVs.
Question eight. What Happens When Uv Detectors Detect A Fire?
1 out of 4 UVs: creates annunciation, audible alarm on the manage panel and siren in the discipline (discuss with the station drawings for the exact feature and operations).
2 out of 4 UVs: creates annunciation, audible alarm at the manipulate panel, a siren inside the area, shutdown of the turbine and launch of the hearth extinguisher (refer to the station drawings for the precise feature and operations).
Question nine. How Much Is The Time Delay Between Fire Sensing By A Uv Detector And Confirming With An Alarm?
Generally it is set for 4 secs. The UV detectors initiates a fire alarm best when the UV is detecting the fire continuously for four secs (talk to the station drawings for the precise settings parameters).
Question 10. What Are The Halon Manual Release Facilities Available On A Solar Gas Turbine?
Auto Halon cylinder may be discharged manually from the hearth & gasoline control panel in the manage room. On instiating the guide launch:
The unit shuts down.
The automobile Halon cylinder receives discharged in the hood.
Auto halon discharge confirmation and the car Halon cylinder pressure low alarm seems on the manipulate panel.
Audible alarm in the manipulate room and siren in the subject takes place.
Manual Halon cylinder can discharge manually from the field via a pall string. On starting up the guide launch:
The unit shutdown.
The guide Halon cylinder gets discharged inside the hood.
Manual Halon discharge affirmation and the guide Halon cylinder pressure low alarm seems on the control panel.
Audible alarm in the control room and siren within the area occurs.
Question 11. Why Are There ‘warmth Switches’ Inside The Hood, When There Are Uv Detectors?
Heat switches are a mechanical type and they may be taken into consideration to be a effective kind of hearth detection gadget. The warmness switch settings are an awful lot better than the hood temperature.
Question 12. What Maybe The Reasons If A Unit Shutdown On False Heat Detected Alarm?
The purpose may be:
Hood air flow fan has failed or stopped.
Major hot gasoline leak in the hood.
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Question 13. What Happens When A Heat Switch Actuates?
On detection of warmth, the warmth transfer initiates the following:
Annunciation, audible alarm on the manipulate panel, a siren inside the subject, shut down of the turbine and release of hearth extinguisher (check with the station drawings for the precise settings parameters).
Question 14. Explain The Operating Principle Of A Gas Monitor?
Gas monitor measures the imbalance in the contemporary loop due to its energetic and inactive filaments within the presence of a flamable fuel.
Question 15. Explain The Calibration Procedure Of A Gas Monitor System?
Gas sensor loop current or voltage at the sensor head is ready as in step with the producer’s advocated value.
Gas screen 0 is adjusted to the tool air.
A take a look at gasoline with a recognized amount of combustion gasoline (Generally methane 2% by extent) is fed to the sensor and the span is adjusted to study forty% on the screen scale (discuss with the station drawings for the exact settings parameters).
The calibration technique is repeated until the 0 and span reads efficaciously.
Question sixteen. What Are The Alarm And Shut Down Setting On A Gas Monitor?
Generally on the gasoline reveal, the alarm is about at 20p.Cgrowing and the shutdown is about at 60percentrising (discuss with the station drawing for the precise settings parameters)
Question 17. What Has To Be Done Prior To Entering A Gas Turbine Hood?
Prior to getting into a fuel turbine, switch on the ‘air flow defeat switch’.
Question 18. What Is A Ventilation Defeat Switch?
On activating, the ventilation defeat switch inhibits the release of Halon inside the automobile mode and also the unit shutdown on ‘air flow failure’.
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Question 19. How Much Is The Delay Between Fire Detection And Halon Release? Why Is The Time Delay Required?
A time postpone of 15 secs. Is set among the detection of fireplace and the initiation of Halon launch. This is to achieve powerful fire extinguishing by allowing the hood fan to run-down to zero pace and the bleed valves to release the compressed air.
Question 20. What Does A Hood Ventilation Fan Do When A Fire Is Detected? And Why?
On detection of fireplace, the fireplace system initiates the hood fan shutdown. This is to reduce the presence of air the hood for freeing the extinguisher.