Cooker yellow flame?

[Fergus]

Just re commissioning the boat and just get large yellow flame from the hob - not enough air or what? Have rodded the burner holes to no avail and gas pressure ok. Any ideas please?!!

Thanks in advance!

 

[sarabande]

Air induction hole clear of spiders etc (usually located near knob)

Twin burner ? If so, both burners yellow, ditto for oven if fitted.

(Trying to establish a common cause.)

 

[Sandy]

Must be spiders.

https://uk.answers.yahoo.com/question/index?qid=20110116050251AAfUJ3R

 

[Alpha22]

Often rust...... if you can, take off the burners... leave the jets alone. Clean out all the rust and detritus. If still yellow, replace burners.

 

[Fergus]

Air induction hole clear of spiders etc (usually located near knob)

Twin burner ? If so, both burners yellow, ditto for oven if fitted.

(Trying to establish a common cause.)

Can't see a hole anywhere - burners corroded and not removeable and mobilife out of business. Where are the Venturi thingies pls?!

 

[sarabande]

I have only seen the venturis adjacent to the control knob for each burner, usually an inch or so 'inside' from the knob itself, in the tube leading from the knob to the burner.. However, checking that with a websearch shows a number of alternative positions, including round the burner/jet assembly itself.

https://www.google.co.uk/search?q=l...UzzI5DrepoGIDw&ved=0CC4QsAQ&biw=1024&bih=1087


HTH

 

[VicS]

Can't see a hole anywhere - burners corroded and not removeable and mobilife out of business. Where are the Venturi thingies pls?!

Using correct gas for cooker ? Are you sure the gas pressure is correct?

 

[ProDave]

Yellow flame means too little air doesn't it? Think bunsen burner at school. Close the air intake = yellow flame. Open the air intake = blue hotter flame.

So it's unlikely you have too little air, that's just not likely to block up. So more likely too much gas (so too little air to match the higher gas flow)? rusted jet so it's now too big? or gas pressure too high (failed regulator)

Or am I just talking hot air?

 

[rob2]

Yellow flame develloping on an installed cooker is the classic symptom of blocked secondary aeration vents. The burner does not actually sit firmly down on its base, it has dimples or ridges to allow air to be sucked in immediately before ignition. Over the years rust or grease and soap suds run into the gap and stop the required aeration. You really need to get the burners off and clear the gap. although maybe you can find something to rake them out, but they're pretty narrow.

My original cooker did this to me after the first winter ashore and I had to drill the screws out to get the burners off.

Rob.

 

[Fergus]

Thanks for all the helpful advice - cured with the aid of a vacuum cleaner!

 

[VicS]

Thanks for all the helpful advice - cured with the aid of a vacuum cleaner!

To clean the burners or to blast in extra air?

 

[Fergus]

To suck all the oxidised **** out!

 

[nigelmercier]

I'm surprised nobody mentioned that burning gas with a yellow flame produces Carbon Monoxide. So perhaps a good time to fit a CO alarm: http://amzn.to/1hdBDYJ

 

[VicS]

I'm surprised nobody mentioned that burning gas with a yellow flame produces Carbon Monoxide. So perhaps a good time to fit a CO alarm

Which is why thousands of school kids suffer from carbon monoxide poisoning from their bunsen burners on yellow flames.

 

[VicMallows]

Which is why thousands of school kids suffer from carbon monoxide poisoning from their bunsen burners on yellow flames.

Do they really still have bunsen burners and multiple fulham nozzle taps on the benches which children can play with? If so I'm impressed. I assumed that such things would have been banned (H & S) long long ago.

 

[nigelmercier]

Which is why thousands of school kids suffer from carbon monoxide poisoning from their bunsen burners on yellow flames.

I didn't know that was the case, so is this sarcasm and you are doubting my comment?

Check pilot lights and other gas flames that normally burn blue. If the flame changes to yellow or orange, CO might be present. Source: http://www.britishgas.co.uk/products-and-services/gas-and-electricity/gas-safety.html

 

[Alpha22]

Do they really still have bunsen burners and multiple fulham nozzle taps on the benches which children can play with? If so I'm impressed. I assumed that such things would have been banned (H & S) long long ago.

Still the norm...... but you don't see many deaths due to CO poisoning in the science labs....?????
Although these days the 'master' tap by the door is generally in the Off position rather than the On position.

 

[VicS]

I didn't know that was the case, so is this sarcasm and you are doubting my comment?

Check pilot lights and other gas flames that normally burn blue. If the flame changes to yellow or orange, CO might be present. Source: http://www.britishgas.co.uk/products-and-services/gas-and-electricity/gas-safety.html

I believe at some time in past concerns were raised that yellow flames from bunsen burners could be producing CO and they were modified by drilling a small hole in the sleeve that closes off the air hole.
I think later it was shown that there was no CO or at least not at a level to be of any concern and the practice was discontinued.

 

[AntarcticPilot]

Still the norm...... but you don't see many deaths due to CO poisoning in the science labs....?????
Although these days the 'master' tap by the door is generally in the Off position rather than the On position.

Science laboratories are large, well-ventilated spaces compared with the cabin of a yacht. The CO produced by a bunsen burnner with a yellow flame is minimal as the gas flow is small, and the flame is well ventilated, so although the flame produces CO, it is oxidized to CO2 in the outermost part of the flame. Any CO produced will also rise to the top of the laboratory, as it is hot (CO is about the same density as air). A yacht's cabin is a small space, and often not well ventilated (we would like to keep heat in!). The top of the cabin, where hot CO will rise to, is about at head level. Further, a cooker is using gas at a higher rate than a bunsen burner, and the flame is likely to be burning in a confined space between the burner and a pan. The cold pan will again chill the flame, ensuring there is no secondary combution of CO. CO production under these conditions is maximised, and from experience (with a CO monitor!) I can say that the CO level will build VERY rapidly if you use a badly adjusted cooker burner. As said experience was coupled with a rather nasty medical event (unrelated to CO, except via physiological panic response to the alarm), I am not likely to forget it.

Please, DON'T take any chances with CO.

 

[nigelmercier]

Science laboratories are large, well-ventilated spaces compared with the cabin of a yacht. The CO produced by a bunsen burnner with a yellow flame is minimal as the gas flow is small, and the flame is well ventilated, so although the flame produces CO, it is oxidized to CO2 in the outermost part of the flame...

Please, DON'T take any chances with CO.

Thank you. So I repeat.

... So perhaps a good time to fit a CO alarm: http://amzn.to/1hdBDYJ

As an aside, my form classroom at school was the chemistry lab. We used to warm it up with the Bunsen burners, when they were not being used for water fights of course. What idiot thought it was a good idea to simply push the hose onto the gas tap, AND have a water tap with the same OD.