Dry powder fire extinguisher

Stivino · 13 Jan 2021

bernardgreen said:
Dry powder extinguishers are tanks of dry powder with compressed nitrogen as the propellant. In extinguishers like this, it's the composition of the chemical (rather than the mechanical design of the extinguisher) that really counts The powder is a specially designed mixture that absorbs heat, melts, and coats the fuel, stopping it from making flammable vapors and blocking out oxygen, so it's helping to tackle two sides of the fire triangle at once. The most widely used powder in extinguishers is monoammonium phosphate; other powder ingredients include the metal alkali salts sodium bicarbonate (baking soda) and potassium bicarbonate (similar to sodium bicarbonate), though these are less effective on things like wood and paper fires.

SOURCE

They are not all propelled by Nitrogen. As I said, in the ones we did the gas used was CO2.
For every link you produce saying it's Nitrogen, I could provide a link saying O2. But, I don't want to go down that road so let's just leave it.
BTW, you have just joined the list of members that I choose to ignore.

lostinthelight · 13 Jan 2021

have a read of this its quite interesting:
https://www.firesafe.org.uk/history-of-fire-extinguishers/

JBR · 14 Jan 2021

lostinthelight said:
have a read of this its quite interesting:
https://www.firesafe.org.uk/history-of-fire-extinguishers/

I bought a water-mist extinguisher for domestic use as it's suitable for all types of fire, even electrical fires, and unlike water, foam and dry powder, doesn't cause a mess!

conny · 14 Jan 2021

JBR said:
I bought a water-mist extinguisher for domestic use as it's suitable for all types of fire, even electrical fires, and unlike water, foam and dry powder, doesn't cause a mess!

How does it work with electrical fires? I'd be a bit concerned using that type on one as electricity can flash across banks of mist. (Think of sky lightening across the clouds, which when all said and done, are banks of mist).

lostinthelight · 14 Jan 2021

conny said:
How does it work with electrical fires? I'd be a bit concerned using that type on one as electricity can flash across banks of mist. (Think of sky lightening across the clouds, which when all said and done, are banks of mist).

Bit of a difference in lightning and mains voltage I would have thought but not heard of mist extinguishers
Edit: Just looked them up and good to 1000volts

JBR · 14 Jan 2021

conny said:
How does it work with electrical fires? I'd be a bit concerned using that type on one as electricity can flash across banks of mist. (Think of sky lightening across the clouds, which when all said and done, are banks of mist).

I haven't tried ours yet, Conny, but I feel confident of using it on an electrical fire if need be.
I think that because the droplets are so fine and dispersed, any electrical potential would be insufficient to keep jumping across from one to the other.
Anyway, ours has a plastic handle and I wear rubber soled slippers, so I'll be OK!

conny · 14 Jan 2021

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local