Boiler "Immediately Dangerous" on flue external CO

[Dan Robinson]

Of course the relatively heavy duty inner flue pipe has corroded through. So the flimsy tin they made the outer flue from is going to be great at holding back all those things spewing from the combustion chamber.

The manky self tapping screws that hold the turret together are perfect for the job and never leak combustion products.

No windows or doors are ever close by flue terminals, and of course no one has ever sat underneath on sunny day.

 

[Agile]

Its unlikely that your boiler will produce a field strength in excess of 300 volts per metre

What does that have to do with the price of fish???

Its the maximum RF field strength ( up to 30 MHz ) that the human body should be exposed to.

As its non ionising the only effect is heating the tissues.

Special attention should be given to higher frequencies because the retina is very sensitive to heat damage.

This is relevant to the OP in relation to RF hazards!

I used to use a Narda meter for those measurements!

 

[davebgas]

Its the maximum RF field strength ( up to 30 MHz ) that the human body should be exposed to.

As its non ionising the only effect is heating the tissues.

Special attention should be given to higher frequencies because the retina is very sensitive to heat damage.

This is relevant to the OP in relation to RF hazards!

I used to use a Narda meter for those measurements!

Did I miss something or isnt the OP worried about Carbon monoxide not his inner flue corroding producing RF hazards?!

 

[doitall]

Carbon Monoxide Detector Placement

PLACEMENT OF CARBON MONOXIDE DETECTORS IMPORTANT



Proper placement of a carbon monoxide detector is important. If you are installing only one carbon monoxide detector, the Consumer Product Safety Commission (CPSC) recommends it be located near the sleeping area, where it can wake you if you are asleep. Additional detectors on every level and in every bedroom of a home provides extra protection.



Homeowners should remember not to install carbon monoxide detectors directly above or beside fuel-burning appliances, as appliances may emit a small amount of carbon monoxide upon start-up. A detector should not be placed within fifteen feet of heating or cooking appliances or in or near very humid areas such as bathrooms.



When considering where to place a carbon monoxide detector, keep in mind that although carbon monoxide is roughly the same weight as air (carbon monoxide's specific gravity is 0.9657, as stated by the EPA; the National Resource Council lists the specific gravity of air as one), it may be contained in warm air coming from combustion appliances such as home heating equipment. If this is the case, carbon monoxide will rise with the warmer air.

 

[doitall]

http://www.homesafe.com/coalert/

http://www.carbonmonoxidedetectorplacement.com/

 

[Agile]

PLACEMENT OF CARBON MONOXIDE DETECTORS IMPORTANT

Proper placement of a carbon monoxide detector is important. If you are installing only one carbon monoxide detector, the Consumer Product Safety Commission (CPSC) recommends it be located near the sleeping area, where it can wake you if you are asleep. Additional detectors on every level and in every bedroom of a home provides extra protection.

Not much use if you nod off in the living room!

I don't remember any instructions suggesting that either!

 

[hazetimesfive]

No one cares about your radio 4 certification. As pointed out already what is the difference between AR and ID?

I was attempting to make the point that I *understand* implicitly that these rules are required - so that people don't get hurt. I'm sorry that passed you by in your haste to be sarcastic. (But since you've already told me that a high *external* vent CO level will "kill me in less than an hour", I'm not at all convinced by your ability to use reasoning)

The reason for the ID already been answered by your colleagues above, which is as per the rules in force.

Pity you don't understand what I wrote.

 

[icychris]

Its unlikely that your boiler will produce a field strength in excess of 300 volts per metre

What does that have to do with the price of fish???

Its the maximum RF field strength ( up to 30 MHz ) that the human body should be exposed to.

As its non ionising the only effect is heating the tissues.

Special attention should be given to higher frequencies because the retina is very sensitive to heat damage.

This is relevant to the OP in relation to RF hazards!

I used to use a Narda meter for those measurements!

Not surprised, we've got some Narda kit at work, although they have a lot of competition these days. Most of our stuff is up in the GHz (microwave). At those frequencies it tends to cook you from the inside out (esp eyes as you say). But I digress.........

 

[icychris]

http://www.homesafe.com/coalert/

http://www.carbonmonoxidedetectorplacement.com/[/QUOTE]

So it should be in the hall then? - (next to the smoke alarm)

"Homeowners should remember not to install carbon monoxide detectors directly above or beside fuel-burning appliances, as appliances may emit a small amount of carbon monoxide upon start-up. A detector should not be placed within fifteen feet of heating or cooking appliances or in or near very humid areas such as bathrooms."

 

[icychris]

Of course the relatively heavy duty inner flue pipe has corroded through. So the flimsy tin they made the outer flue from is going to be great at holding back all those things spewing from the combustion chamber.

The manky self tapping screws that hold the turret together are perfect for the job and never leak combustion products.

No windows or doors are ever close by flue terminals, and of course no one has ever sat underneath on sunny day.

Good explanation - Ta. I assume this was sarcasm? Let me check my snarcmeter. Ah, off-scale high.

 

[Dan Robinson]

Only partially sarcy

Not as sarcy as my opening post was stroppy anyway.

 

[Porque223]

70 PPM CO is definitely dangerous. Sleeping for 8 hours in 35 PPM may cause brain damage, along with false alarms for a device this sensitive.

The problem is CO has 300x the affinity for blood cells than does O2.

BTW, there is a slight vacuum inside of a moving car so if you have headaches, nausea or dizziness while driving look and listen for an exhaust leak.

 

[ianmcd]

Op you have been given correct but also some misleading information, when the attending engineer analysed your products of combustion it indicated a problem, the engineer has identified that the problem is a corroded inner flue duct, your boilers combustion chamber operates under a negative pressure principle but as the inner duct is corroded the positive pressure products are being returned to the combustion chamber,on your appliance this causes flame lift off, this can and often does result in an explosion so the attending engineer was 100% correct in classifying the appliance as ID. it may be possible to just replace the flue if your engineer can access one but if you have the means would be better in the long run to replace the appliance

 

[icychris]

Op you have been given correct but also some misleading information, when the attending engineer analysed your products of combustion it indicated a problem, the engineer has identified that the problem is a corroded inner flue duct, your boilers combustion chamber operates under a negative pressure principle but as the inner duct is corroded the positive pressure products are being returned to the combustion chamber,on your appliance this causes flame lift off, this can and often does result in an explosion so the attending engineer was 100% correct in classifying the appliance as ID. it may be possible to just replace the flue if your engineer can access one but if you have the means would be better in the long run to replace the appliance

Yep I agree. They did state that a new boiler would be required as the flue assay was not available for that model any more - Although I subsequently rang round a few places and it can be got. That said, I still decided to get the whole thing replaced (as you say I don't really want to throw good money at something that old!)

 

[Agile]

To be fair there are still many of those boilers still running.

I generally have no problem repairing them and they are pretty reliable apart from two common faults.