Mailing List Archive

Mailing List: techdiver

Message Display

     Ben
     The reason to leave nitrogen in the mix has little to do with thermal 
     properties or HPNS (you said it, EXTREME depths). It's there to reduce 
     the helium level since helium is ongassing fast and therefore giving 
     you extended decompression times. Sure the nitrogen would offgas 
     faster on heliox but then we would'nt get rid of the helium.
     
     
     
     >While I don't know enough about argon to speculate on it's uses, may 
     >I ask a
     >question that may be common knowledge out there?  While George and 
     the >WKPP
     >espouse the benefits of doing deeper stops on trimix (which makes a 
     >whole lot
     >of sense), why not take it one step further and increase the PN2 
     >gradient by
     >eliminating Nitrogen altogether and decompressing on heliox?  As far 
     >as I know
     >(and that's not a whole lot on trimix), the reason for leaving 
     >Nitrogen in at
     >all is to reduce the symptoms of HPNS at extreme depths, and perhaps 
     >to negate
     >some of the poor thermal qualities given to the mix by helium.  But 
     >at
     >shallower depths (than bottom), and using argon, would the reduction 
     >in deco
     >time (if there is one(?)) be worth the reduction in thermal 
     >insulation.  I
     >imagine someone's given this some thought and could enlighten me.  Of 
     >course,
     >it could be simply more logistically feasible to use trimix  (that 
     >may have
     >been your bottom mix) rather than a separate stage of heliox.
     >
     >Ben
     >
--
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]