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AndrewK2
May 20th, 2006, 07:29 PM
Okay, I've been a bit absent from here since December, but glad to be back:)

Anyway, onto my question:
I've just started my Naui Nitrox course and I have a few questions about my gear.
first of all, I'm using a Genesis GS-2000. In the manual, it says not to use it with any mix with more than 21% oxygen. I'm assuming this is because it isn't ready and the seals/lubricants aren't oxygen compatible. So is all I need to do for my regulator is take it to my dive shop and ask them to order and install the proper parts to make it Nitrox safe? Is there such a kit available for this regulator?

Secondly is my BC. In the Naui Nitrox manual, it says BC's don't need to be worried about and says they should be fine. However, in the manual for my Cressi Aquapro 5, it gives a few problems that could arise from using it with nitrox, but doesn't actually say not to use it with nitrox - will there be any issues with the BC? If so, are there kits for BCs as well to make them Nitrox safe?

thanks for all your help

pescador775
May 20th, 2006, 08:24 PM
Nitrox should not be a problem for your gear. Don't use anything above 36% (give or take).

fishb0y
May 20th, 2006, 09:01 PM
Here we go again with the EAN compatable BCD question. Don't take this as me blowing off your question, its just that this was a funny thread to follow... http://www.scubaboard.com/showthread.php?t=132236

AndrewK2
May 20th, 2006, 11:56 PM
okay, so from that thread (and I admit, I did find certain parts really funny) I'll go with the opinion that my BCD will be fine with Nitrox.
I'm still curious about the reg though - doesn't it need to be O2 clean in since it's being exposed to the higher pressure? I'm just wondering why the advice is mixed in this regard. My instructor even says it will be okay, but the Naui book seems to say otherwize and it's getting kind of confusing. Also, if I end up getting my reg cleaned, then do I need to get another reg to use with normal air in order to avoid "contaminating" the one I got cleaned?
Has anyone actually used a reg that isn't meant for Nitrox at 40% O2?

thanks

Nomad
May 21st, 2006, 12:33 AM
I just took the PADI Enriched Air class just this morning. The PADI manual states:
The common dive community guideline is that scuba regulators, BCDs, SPGs and alternate air sources may be used with enriched air blends that have up to 40% oxygen without modification. This guideline, originally based on the standards and field experience of NOAA, the US Navy, the US Occupational Safety and Health Administration (OSHA) and others, has been in use for more than a decade with a good record.
Gas mixes with more than 40% oxygen require equipment (including cylinders) that has been cleaned to oxygen service specifications. This means the equipment must be specially cleaned, be made of oxygen compatible materials and be lubricated with oxygen compatible lubricants. In recreational diving, blends with more than 40% oxygen are uncommon, and generally are used when diving with recreational semiclosed circuit breathers.
Some scuba manufacturers state that their equipment shouldn't be used with enriched air. Others state that their equipment may be used with enriched air, but requires special servicing and maintenance. Follow all manufacturer recommendations with respect to using equipment with enriched air.
The use of oxygen compatible lubricants, O-rings and other materials as appropriate during servicing is generally recommended.
You should have your regulator serviced at least annually, preferably by a scuba technician qualified to work on enriched air equipment. If your equipment is accidentally exposed to anything other than water (i.e., oils, lubricants not recommended by the manufacturer, etc.), have it inspected or recleaned by a qualified technician to ensure that it hasn't picked up anything incompatible for use with enriched air. If you add any accessories, such as low pressure hoses, follow manufacturer recommendations.

Dive-aholic
May 21st, 2006, 09:35 AM
Most regs are okay for use up to 40%. Many of the manufacturers now are using viton o-rings out of the factory. The problem in O2 cleaning mainly has to do with tanks and valves that are filled with mixes greater than 40% or filled using PPB, in which they are getting 100% O2 before they are diluted with air. So by the time the nitrox gets to your 1st stage, it's already below 40%. The 2nd stage doesn't see HP air. A lot of what you read from manufacturers is due to liability reasons more than safety reasons.

cerich
May 21st, 2006, 10:22 AM
Each manuf. has different wording with regards to use of their regs with nitrox. Some use 21%, some 23.5% and some use 40% for recreational use limits. Most training agencies use 40% as the cut off, above which special nitrox cleaning is required.

In the US there are no laws that cover this stuff, thus the limits the manufs. set would be helpful in the event of an legal action. In Europe this stuff is regulated and much more set in stone.

caveseeker7
May 21st, 2006, 11:06 AM
Personally I have all my regs O2 cleaned and compatible. Viton O-rings and O2 compatible grease like Christolube aren't that much more expensive for an annual service and are safer. I only use OC for bailout so I get my gas fills from a shop that I know has clean gas. Even compressed air there is filtered to the same standards as O2 enriched mixes.

AndrewK2
May 22nd, 2006, 02:37 AM
okay, my GS-2000 manual says I shouldn't use it with more than 21% O2, so getting the kit to make my reg safe (viton o-rings and stuff) looks like a good idea, so I'll ask my shop this week how to get that done. Does anyone know roughly how much that'll cost?

Now, most of my diving will still probably be with air, so I'll ask the shop if their air is safe to use once the reg is cleaned. What about diving when on vacation if I don't end up using nitrox, is it just a better idea in the end to buy another reg to use with regular air and use my current reg with nitrox?

mrjimboalaska
May 22nd, 2006, 02:57 AM
Wow,
Just had to look at my GS-2000 Manual, cant believe that they are not good up to 40% EAN but sure enough, air only, damn, I thiink I got had by my LDS.......

fishb0y
May 22nd, 2006, 03:07 AM
Unless you are using your reg for O2 > 40%, don't even both to O2 clean it. The only reason why Nitrox tanks are O2 cleaned, is because of Partial Pressure fills, which begin with 100% O2. Otherwise you are just waisting your money on O2 cleaned regs you don't need.

adsell@seanet.com
May 22nd, 2006, 10:40 AM
Next time you get them serviced have them O2 cleaned, if nothing for else peace of mind and it'll make a good stage bottle reg some day. In which case you will be breathing 50% O2.

cerich
May 22nd, 2006, 10:46 AM
Next time you get them serviced have them O2 cleaned, if nothing for else peace of mind and it'll make a good stage bottle reg some day. In which case you will be breathing 50% O2.

Few things wrong with this.

After a O2 clean for actual high O2 (think 50% up) dedicate that reg to that use.

A stage reg is used on a stage bottle which contains bottom gas or possibly an intermediate gas (used to be called travel mix) on REALLY deep dives.

A deco reg will contain 50%, 100% or other mix depending on the dive profile and planning.

fishb0y
May 22nd, 2006, 11:21 AM
Next time you get them serviced have them O2 cleaned, if nothing for else peace of mind and it'll make a good stage bottle reg some day. In which case you will be breathing 50% O2.
Also, if you O2 clean your reg, you are stuck with a reg that can ONLY be used on tanks that contain O2 compatible air. With everything that has been put out, unless you are using anything above 40EAN, your reg is fine. (I have 2 regs for my Deco Bottles of 50EAN and 100%O2, and they are both O2 clean, and that is all they are used for).

Also, the last time I had it done, it was about $100 to O2 clean a reg (but I may be mistaken).

Lead_carrier
May 22nd, 2006, 12:42 PM
Also, the last time I had it done, it was about $100 to O2 clean a reg (but I may be mistaken).

Dang, did they kiss you when they finished? That sounds a LOT high to me.
I know of one shop in Charlotte that requires you to have your regs O2 cleaned even if they are brand new, unless of course you bought them from him. He says he stores his clean. It's just his way of getting into your wallet a little more.

TheRedHead
May 22nd, 2006, 12:47 PM
Also, the last time I had it done, it was about $100 to O2 clean a reg (but I may be mistaken).

I dropped a reg off Saturday for O2 cleaning. I didn't ask the price. :11:

fishb0y
May 22nd, 2006, 02:24 PM
Dang, did they kiss you when they finished? That sounds a LOT high to me.
No, but they did rub my back... Like I said, its been a while, I do it myself now. I still stand by my opinion that unless it is for a deco reg, they don't need to be cleaned.

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