Mailing List Archive

Mailing List: techdiver

Message Display

At 03:53 PM 10/8/01 +0100, Gliviak, Jozef wrote:
>Hello Guys,
>
>I've heard a story that some Polish guys were using about 20+ % of He in the
>mix in order to prevent regulator freezing during diving in very cold
>springs (1-3C)in High Tatra mountains. Is there any physical explanation of
>this behavior or it it just a old boys tale ?

All cryogenic gas is ultra-dry and will lower the dew point of the mix. 
This means that any mixed gas (nitrox or trimix) will be less prone to 
freezing than air. You might even mix "air" from cryogenic nitrogen and 
oxygen and get the same result. Still, if you choose to make a mix in the 
first place it makes sense to blend a nitrox or a trimix, depending on the 
dive plan. The point is, any gas you buy from a gas vendor is ultra-dry and 
the more dry gas you put in your cylinders the lower the dew point of the 
breathing gas.

regards,

Hans

--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]