Engine Fires...
03-27-2009 | 05:11 AM
#51
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From: Newcastle, UNITED KINGDOM
RE: Engine Fires...
Siclick is correct and I should have indicated it is not required just good practice to follow as per the Gas Turbine Builders Association 'Code of Practice' A2.6 & A2.7 Remote Control and Emergency Fuel Shut-off Systems.
The JMA only suggest "It is strongly recommended that a manually operated shut-off device is fitted" Hey but look at the pictures here and YouTube videos of turbine fires to draw a conclusion that a cheap device that stops fuel instantly to a fire is worth it.
The point to make I hope is that with a pump islotator the pump is off instantly (and can be linked to failsafe). As suggested earlier a pump at full chat pumping against a closed valve has the potential for something to leak adding to the fire problem. Anyway I am sorry to see good models destroyed and for those guys loss.
Paul
The JMA only suggest "It is strongly recommended that a manually operated shut-off device is fitted" Hey but look at the pictures here and YouTube videos of turbine fires to draw a conclusion that a cheap device that stops fuel instantly to a fire is worth it.
The point to make I hope is that with a pump islotator the pump is off instantly (and can be linked to failsafe). As suggested earlier a pump at full chat pumping against a closed valve has the potential for something to leak adding to the fire problem. Anyway I am sorry to see good models destroyed and for those guys loss.
Paul
03-27-2009 | 03:05 PM
#52
RE: Engine Fires...
ORIGINAL: George
[:@][:@] Sorry to see that! [:@][:@]
What happened?
[:@][:@] Sorry to see that! [:@][:@]
What happened?
http://www.youtube.com/watch?v=bPF3hI1wpt8
03-27-2009 | 07:49 PM
#53
RE: Engine Fires...
A friend has a Lambert in a Multiplex Twinjet foamie. There is very little room inside so instead of the servo operated valve he has a servo operating the ECU power switch. This also meets the rule as stated:
In addition to the particular turbine manufacturers specified means of shutting the turbine down it is a further requirement that the turbine can be shut down by an independent (independent of the Turbine ECU) receiver channel, which is to be operated remotely by means of the transmitter control. It is also a requirement that the installation include a manual (by hand) means of shutting the turbine down and that this method be accessible during the whole start-up and shutdown phase of the turbine.
No power, no pump, no fuel. - John.
In addition to the particular turbine manufacturers specified means of shutting the turbine down it is a further requirement that the turbine can be shut down by an independent (independent of the Turbine ECU) receiver channel, which is to be operated remotely by means of the transmitter control. It is also a requirement that the installation include a manual (by hand) means of shutting the turbine down and that this method be accessible during the whole start-up and shutdown phase of the turbine.
No power, no pump, no fuel. - John.
03-28-2009 | 02:50 AM
#54
RE: Engine Fires...
ORIGINAL: FalconWings
I think the shutoff valve should absolutely be just before the turbine "inlet", downstream of the solenoid and pump. Thats why it is a shutoff valve.
Let me explain myself.....say if you have a very long fuel line after the pump and the engine catches fire. If the shutoff valve is upstream of the pump, you can still have a lot of fuel trapped inside the fuel line that could still make it to the engine, therefore feeding the flame. If the shutoff valve is closer to the engine, any trapped fuel in the engine feed line would be blocked from entering the turbine.
David
I think the shutoff valve should absolutely be just before the turbine "inlet", downstream of the solenoid and pump. Thats why it is a shutoff valve.
Let me explain myself.....say if you have a very long fuel line after the pump and the engine catches fire. If the shutoff valve is upstream of the pump, you can still have a lot of fuel trapped inside the fuel line that could still make it to the engine, therefore feeding the flame. If the shutoff valve is closer to the engine, any trapped fuel in the engine feed line would be blocked from entering the turbine.
David
With due respect, the length of the fuel lines does not matter if the line is shut off, to prove it fill a tube with water, block one end then try and suck the water out the other end, unless the tube collapses you will not get anything out of the tube.
My thinking is as long as the ECU is still OK shut off the Tx this should put you into fail safe and shut off the turbine, if safe shut off your manual valve, then douse the flames.
Mike
