Rebreather World - View Single Post - O2 for suit inflation on deep Rebreather cave dives

Barrie Law · 10th October 2006, 01:33

Quote: (Originally Posted by mortenkjerulff)

Does anyone know if the ignition temperature of a material is a function of the partial pressure of oxygen surrounding the material, or if that is irrelevant?

If not, then why should we be afraid of a fire in our drysuit, when we normally do not burn holes in our clothing during diving (I know that more oxygen makes the fire more violent).

Morten

Hi Morten,

I believe it is the 100% Oxygen rather than the Bar pressure that is the concern here because although Oxygen will not Burn (*) it will cause a fire once ignited to vigorously spread within the drysuit as you mention.

The question is can a fire be started in a DS during a dive given the normally damp condition of the undersuit and is the material used in the undersuit capable of producing enough static to ignite the undersuit even if bone-dry?

I suspect Mdemon or Iain-hsm will have some results on that but the best I could do even with a naked flame was to melt a bit of the material from the undersuit.

(*) There was a fact regarding Oxygen burning that escapes me but it was not relevant to using it in a DS.

Regards

10th October 2006, 01:33	#59 (permalink)
Barrie Law Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jun 2005 Location: Ireland Posts: 459	Re: O2 for suit inflation on deep Rebreather cave dives Quote: (Originally Posted by mortenkjerulff) Does anyone know if the ignition temperature of a material is a function of the partial pressure of oxygen surrounding the material, or if that is irrelevant? If not, then why should we be afraid of a fire in our drysuit, when we normally do not burn holes in our clothing during diving (I know that more oxygen makes the fire more violent). Morten Hi Morten, I believe it is the 100% Oxygen rather than the Bar pressure that is the concern here because although Oxygen will not Burn () it will cause a fire once ignited to vigorously spread within the drysuit as you mention. The question is can a fire be started in a DS during a dive given the normally damp condition of the undersuit and is the material used in the undersuit capable of producing enough static to ignite the undersuit even if bone-dry? I suspect Mdemon or Iain-hsm will have some results on that but the best I could do even with a naked flame was to melt a bit of the material from the undersuit. () There was a fact regarding Oxygen burning that escapes me but it was not relevant to using it in a DS. Regards
(Offline)