Explosive medicine....

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Andy_R

Hard of hearing..I said Herd of Herring..oh FFS..
Location
County Durham
All I got was Voltarol,it works,works very well in fact,but it doesnt have an air of menace about it !
Ah, that's becasue you should have got Voldermort, not Volterol.
 

slowwww

Veteran
Location
Surrey
All I got was Voltarol,it works,works very well in fact,but it doesnt have an air of menace about it !
+1, but make sure to wash your hands thoroughly after applying. I forgot earlier in the week and had to endure fingers with the dexterity of Bambi on ice for the morning!
 

Profpointy

Legendary Member
Agricultural fertilisers are not explosives. They are oxidising agents. Under normal storage conditions they pose no threat whatsoever. So no I wouldn't worry about six tonnes of fertiliser stored in, at or near my home. In the grand scheme of things six tonnes is not a lot. Users of ammonium nitrate are advised to limit the size of their stacks to three hundred tonnes.

You need to acquaint yourself with the relevant HSE documentation and get to grips with the extremely low risks of properly stored fertilisers.

ammonium nitrate absolutely is an explosive - as well as being an oxidising agent. Used commercially for quarrying (mixed with fuel oil, note the fuel oil is to help the nitrate itself detonate - the nitrate is not merely oxidising agent) and associated with a few big accidental explosions. It usually doesn't blow up and fertiliser has various additives to make it (even) harder to set off. My schoolboy chemistry nit all forgotten
 

vernon

Harder than Ronnie Pickering
Location
Meanwood, Leeds
ammonium nitrate absolutely is an explosive - as well as being an oxidising agent. Used commercially for quarrying (mixed with fuel oil, note the fuel oil is to help the nitrate itself detonate - the nitrate is not merely oxidising agent) and associated with a few big accidental explosions. It usually doesn't blow up and fertiliser has various additives to make it (even) harder to set off. My schoolboy chemistry nit all forgotten

The accidental explosions happen under extreme conditions and the ammonium nitrate usually needs something to oxidise. Under normal storage conditions in the absence of combustable materials and extreme heat it is not an explosive.
 

Profpointy

Legendary Member
The accidental explosions happen under extreme conditions and the ammonium nitrate usually needs something to oxidise. Under normal storage conditions in the absence of combustable materials and extreme heat it is not an explosive.

I don't think the anfo thing is Ammonium nitrate purely as an oxidising agent for the fuel oil. My understanding was the nitrate was actually doing the exploding, with the oil being in a sense a contaminant which helped it / allowed it to go off. It's not the same as the sulphur / charcoal in gunpowder where the saltpetre is only acting as an oxidising agent. In a sense gunpowder only burns very quickly rather than exploding. Your right that it won't explode under "normal" conditions, and that "normally" it is indeed only an oxidising agent.
 

vernon

Harder than Ronnie Pickering
Location
Meanwood, Leeds
I don't think the anfo thing is Ammonium nitrate purely as an oxidising agent for the fuel oil. My understanding was the nitrate was actually doing the exploding, with the oil being in a sense a contaminant which helped it / allowed it to go off. It's not the same as the sulphur / charcoal in gunpowder where the saltpetre is only acting as an oxidising agent. In a sense gunpowder only burns very quickly rather than exploding. Your right that it won't explode under "normal" conditions, and that "normally" it is indeed only an oxidising agent.

Nope it wasn't the nitro exploding. An explosion is caused by the rapid expansion of gases. The fuel oil supplies the carbon and the hydrogen to be oxidised rapidly into huge volumes of carbon dioxide and steam. Without the 'contaminants' to oxidise, there's no huge volumes of gases being generated and no explosion. it's very much the same as gunpowder. Saltpetre is quite happy being heated and melted without additives to oxidise, very much like ammonium nitrate. I could even do a Youtube demonstration to demonstrate the fact but the anti terrorist squad would be more attentive of my incendiary prowess that I'd welcome. I am a Fuel and Energy engineering graduate with explosives and combustion as a substantial part of my degree. I trust my judgement. I don't trust yours.
 

vernon

Harder than Ronnie Pickering
Location
Meanwood, Leeds


Ha ha ha ha ha


That's one of mine.

I was attempting to destroy the quiche making capacity of North America.
 

vernon

Harder than Ronnie Pickering
Location
Meanwood, Leeds
I don't think the anfo thing is Ammonium nitrate purely as an oxidising agent for the fuel oil. My understanding was the nitrate was actually doing the exploding, with the oil being in a sense a contaminant which helped it / allowed it to go off. It's not the same as the sulphur / charcoal in gunpowder where the saltpetre is only acting as an oxidising agent. In a sense gunpowder only burns very quickly rather than exploding. Your right that it won't explode under "normal" conditions, and that "normally" it is indeed only an oxidising agent.

Read the following very carefully. You might modify your opinions.

When heated, ammonium nitrate decomposes non-explosively into gases including oxygen; however, ammonium nitrate can be induced to decompose explosively by detonation. Large stockpiles of the material can be a major firerisk due to their supporting oxidation, and may also detonate, as happened in the Texas City disaster of 1947, which led to major changes in the regulations for storage and handling.

There are two major classes of incidents resulting in explosions:

  • In the first case, the explosion happens by the mechanism of shock to detonation transition. The initiation happens by an explosive charge going off in the mass, by the detonation of a shell thrown into the mass, or by detonation of an explosive mixture in contact with the mass. The examples are Kriewald, Morgan, Oppau, Tessenderlo and Traskwood.
  • In the second case, the explosion results from a fire that spreads into the ammonium nitrate (AN) itself (Texas City, Brest), or to a mixture of an ammonium nitrate with a combustible material during the fire. The fire must be confined at least to a degree for successful transition from a fire to an explosion (a phenomenon known as "deflagration to detonation transition", or DDT). Pure, compact AN is stable and very difficult to initiate. However, there are numerous cases when even impure AN did not explode in a fire.
Ammonium nitrate decomposes in temperatures above 210 °C. Pure AN is stable and will stop decomposing once the heat source is removed, but when catalysts are present (combustible materials, acids, metal ions, chlorides. ..) the reaction can become self-sustaining (known as self-sustaining decomposition, SSD). This is a well-known hazard with some types of NPK fertilizers, and is responsible for the loss of several cargo ships.
 

winjim

Straddle the line, discord and rhyme
AFAIK GTN releases nitric oxide to help with the healing of tendons...... Best not to kneel down quickly though lol

Shaun
I think it's something to do with NO being a vasodilator, thus increasing blood flow to the affected area.

I seem to remember a thread on here about beetroot juice as a training supplement. Beetroot is a source of nitrate, which forms NO, which as a vasodilator increases blood flow, and therefore oxygen availability. Or summat.
 

vernon

Harder than Ronnie Pickering
Location
Meanwood, Leeds
I think it's something to do with NO being a vasodilator, thus increasing blood flow to the affected area.

I seem to remember a thread on here about beetroot juice as a training supplement. Beetroot is a source of nitrate, which forms NO, which as a vasodilator increases blood flow, and therefore oxygen availability. Or summat.

Can beetroot be used as a Viagra substitute? How many jars are the equivalent of one pill?
 

Fab Foodie

hanging-on in quiet desperation ...
Location
Kirton, Devon.
I was prescribed a glyceryl trinitrate spray following a spate of mild angina pains and an angiogram. I was told it is a vasodilator, and that I should use it under my tongue when out on my bike if I knew there was a big climb coming up :smile:. As I hate hills, I was happy with any help I could get, and it does seem to help a bit. (The angina seems to have gone away thank god.) I suppose it would improve blood supply to damaged ligaments, if they have such a thing.
I have this in case I feel a bit of a cardio-wobbler or Angina, but rarely if ever need it .... doesn't half give you a thumping headache though for a few minutes ....
 
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