Re: Niva fuel spillage
Posted: Thu Mar 17, 2011 6:30 am
SP450andLE wrote:Failed. Brakes
Brakes?Niva do not have brakes.That middle pedal is a foot rest
Brakes?Niva do not have brakes.That middle pedal is a foot rest
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Niva fuel spillage
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Brakes?Niva do not have brakes.That middle pedal is a foot rest
Re: Niva fuel spillage
Posted: Thu Mar 17, 2011 7:25 am
giovanni wrote:SP450andLE wrote:Failed. Brakes
Brakes?Niva do not have brakes.That middle pedal is a foot rest
That's what I thought.
But the WoF guys thought differently...
Re: Niva fuel spillage
Posted: Sat Mar 19, 2011 6:55 am
Talking about a full tank, and drilling into a 3 mm breather tube, chance of spark big (hot) enough to ignite petrol is minimal to zero. To get it to explode is impossible with a full fuel tank and still unlucky with an empty fumey one. There is not enough oxygen to allow the bulk of fuel to reach it's Upper explosion limit. If you get a spark which is hot enough to ignite the petrol it will only burn with black carbonising flame (not enough oxygen for the amount of fuel burning)which you could put out with your finger over the breather.(or standing by fire extinguisher)
A petrol engine brings all the properties together to allow petrol to explode,( and even then sometimes it struggles)
A carb or computer with injector to get the explosion ratio of fuel to oxygen correct.
Heat
Hot spark ( 15000-40000 volts)
Compression
As for using a vacuum cleaner, the air to vapour ratio would be
way to lean and even if it did fall into the explosion zone of petrol a ac motor is brushless and has nothing to cause a spark so again have to be very very unlucky to get an explosion. If you did the fuel available to explode is too small so all you would get is a small pop. The drill is dc and so has brushes and will spark, but again will not be in a mixture that comes close to the explosion range of petrol.
So I would say as I did before you will be fine to drill the tank breather.
However if you are worried or want to be ultra safe you can remove the tank and flush it and then inert gass it and then drill.
Welding on a fuel tank is a totally different story and should never be done on a fuel tank that has not been de fumed as it introduces lots of heat and ignition source and is carried out on a empty tank which allows more oxygen to be present
.This is what would have caused a situation mentioned with the boats fuel tank.
Sorry to thread jack. Just thought I would give my reasoning in behind my advice.
A petrol engine brings all the properties together to allow petrol to explode,( and even then sometimes it struggles)
A carb or computer with injector to get the explosion ratio of fuel to oxygen correct.
Heat
Hot spark ( 15000-40000 volts)
Compression
As for using a vacuum cleaner, the air to vapour ratio would be
way to lean and even if it did fall into the explosion zone of petrol a ac motor is brushless and has nothing to cause a spark so again have to be very very unlucky to get an explosion. If you did the fuel available to explode is too small so all you would get is a small pop. The drill is dc and so has brushes and will spark, but again will not be in a mixture that comes close to the explosion range of petrol.
So I would say as I did before you will be fine to drill the tank breather.
However if you are worried or want to be ultra safe you can remove the tank and flush it and then inert gass it and then drill.
Welding on a fuel tank is a totally different story and should never be done on a fuel tank that has not been de fumed as it introduces lots of heat and ignition source and is carried out on a empty tank which allows more oxygen to be present
.This is what would have caused a situation mentioned with the boats fuel tank.
Sorry to thread jack. Just thought I would give my reasoning in behind my advice.
Re: Niva fuel spillage
Posted: Sat Mar 19, 2011 7:48 am
That's ok
Well... I did remove the tank, and filled it with water. I drilled it out no problems.
It's now back in and all set up. Just needs the cover put back on at some stage.
Also... You wrote that at 7:55 in the morning? Congrats to you, I can barely read the screen at this hour on a Saturday!
Well... I did remove the tank, and filled it with water. I drilled it out no problems.
It's now back in and all set up. Just needs the cover put back on at some stage.
Also... You wrote that at 7:55 in the morning? Congrats to you, I can barely read the screen at this hour on a Saturday!
Re: Niva fuel spillage
Posted: Sat Mar 19, 2011 7:34 pm
No it was 755 at night here. I am a marine engineer currently working in Spain. 
Re: Niva fuel spillage
Posted: Sat Mar 19, 2011 8:05 pm
Nivapulledout wrote:No it was 755 at night here. I am a marine engineer currently working in Spain.
Ohhhh. That makes more sense