O2 clean air in remote locations

[boulderjohn]

I have to assume some people in this forum go on expeditions to remote locations and thus need to blend nitrox and trimix while on site or nearly on site. For those who do that, how do you obtain O2 clean air to top off the blend?

 

[ScubaDemon]

Hi. Bring your own filters. Either a proper filter tower with connectors to suit your compressor layout, or those small "personal" filters that screw onto your tank valve whilst filling.


Sent from my iPhone using Tapatalk

 

[NAM001]

I was thinking of the bever filter. Looks like a giant cigar 15"x2" perhaps, but is it large enough to provide enough dwell time to do any good or its it used only with very slow fill rates?


Beaver 300 Bar DIN Air Personal Air Filter by Beaver Sports - DiveLife

Beaver Sports - Welcome

 

[karstdvr]

I have to assume some people in this forum go on expeditions to remote locations and thus need to blend nitrox and trimix while on site or nearly on site. For those who do that, how do you obtain O2 clean air to top off the blend?

In reality how many compressors in the US provide the hyperpure quality air for blending at those shops that do blending. They are all filtered,but very rarely do they meet the requirements. The air basically is free of contaminants to a huge degree,so I don't stress about it. I know I will grief about it,but the OCD level of O2 cleaning is great, but by and large over kill. After the Apollo 1 accident, NASA tried to recreate the accident with O2 combustion, and couldn't make it happen, until they went to extremes, like introduce greater than than trace amounts of fuel for combustion. Hence, if the filter stack has been changed in accordance to the recommended number of hours, then I am fine with it for partial pressure blending.

 

[boulderjohn]

, or those small "personal" filters that screw onto your tank valve whilst filling.

Can you point me to one?

 

[ScubaDemon]

Maximator Personal Filter Nitrox Clean - Deepstop GmbH

Beaver Sports - Welcome




Sent from my iPhone using Tapatalk

---------- Post added September 9th, 2015 at 05:39 PM ----------

Maximator Personal Filter Nitrox Clean - Deepstop GmbH

Beaver Sports - Welcome




Sent from my iPhone using Tapatalk

 

[boulderjohn]

I have been talking to a compressor manufacturer, and he said it would be possible to make a portable filter system for about $3,000. It would be considerably larger than what is being suggested here. Are the systems being described here really up to the job?

 

[ScubaDemon]

It depends on quality of pre filtration, fill materials used, usage duration, humidity, many other factors. I have successfully used these in the past, changing he filter materials often. I have also conducted air quality tests, and they were within O2 limits.
I also have bigger mobile filter stacks, which I use when larger gas quantities are required.


Sent from my iPhone using Tapatalk

 

[rjack321]

I have been talking to a compressor manufacturer, and he said it would be possible to make a portable filter system for about $3,000. It would be considerably larger than what is being suggested here. Are the systems being described here really up to the job?

They mean about $750 for the actual filter and $2,250 to CYA.

It all depends on the compressor output rate in order to get the dwell time. And if the installed shop filters are doing anything at all in the first place. You can make OCA from "normal" grade D breathing gas fairly easily with only a 2nd filter, I'd add hopcalite just in case.

For my expedition trips I bring my own compressor. I don't consider places with dive shops and native compressors "expeditions"

 

[Kevrumbo]

I have to assume some people in this forum go on expeditions to remote locations and thus need to blend nitrox and trimix while on site or nearly on site. For those who do that, how do you obtain O2 clean air to top off the blend?

For our 2010 Aircraft Carrier HMS Hermes Expedition, we procured O2 & nearly bought out in advance the equivalent of an entire two week commercial supply of Helium in all of Sri Lanka. A few pictures of the compressor & fill "field set-up" here:

Picasa Web Albums - Mike - HMS Hermes, S...

Picasa Web Albums - Mike - HMS Hermes, S...

Picasa Web Albums - Mike - HMS Hermes, S...

Picasa Web Albums - Mike - HMS Hermes, S...

Tech Asia, a GUE affiliate Dive Center in Puerto Galera Philippines, has the logistics expertise & experience in setting up gas blending at remote overseas dive sites:

http://www.asiadivers.com/technical-diving-philippines/hms-hermes.html