PSI-PCI - EANx Standards 2005 this is where they are getting that info
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Again...I've never had any of the problems you're describing...but it would appear to me that most if not all of what you're describing is due to the fact the shop(s) is/are on the verge of collapse...and are doing anything possible to generate revenue...
I buy my annual visual stickers from TDI/SDI...they're light blue in colour...have all the standard inspection requirement punch points...and have never come into question...at any of the Canadian/NC/Florida locations I visit...and I'll match my cylinder inspection/cleaning protocols with anyone...
I've paid anywhere from eight...to twenty dollars for NITROX fills...I pay what the operators charge...no questions asked...I always travel with my own analyzer...and AWAYS check my mix myself...
I'm of the opinion...as related in your above post...if the burst disc nut is removed...the burst disc should be changed...if your valves are O2 cleaned...the above mentioned tech is not doing you/your tanks any favour by unscrewing your BD nut...visually inspecting the BD...and re-assembling as is without proper cleaning...and resealing...this isn't inspection...as much as it is tampering...and he/she wouldn't be opening up my valves...fill or no fill...
On a busy ''fill day'' this tech is going to be run off his/her feet opening up every BD nut on every tank that comes into the shop for a fill...I wonder how many are going to leak...following his/her tampering...
PSI-PCI - EANx Standards 2005 this is where they are getting that info
Just to throw 2 more cents in, I never installed a hyperfilter on any air system I've ever owned or operated, and I've never failed to pass OCA on an air test.Mike...
Note...normal compressed air...normal scuba cylinders...
Taken to mean...breathing air not ''hyper filtered'' for enriched air service...scuba cylinders not ''properly'' cleaned for enriched air service...
Now with current ''blend stick'' fill methods...you can fill up to and including 40% EAN...without having the cylinder/valve O2 service cleaned...meaning the PSI 2005 standard...while still vital...does not take into consideration...current ''blend stick'' fill protocols...
This is now why there is so much fill discrepency between shops...those using partial fill processes have one book of procedures which they follow...and the blend stick shops have...well not much...
I would not be placing NITROX bands on cylinders that have not been enriched air service cleaned that are being filled with EAN blends to 40% using blend stick fill procedures...as in most cases the air used may not be hyper-filtered...
Dive shops using 40% max blend stick fill procedures are now saving lots of time and money...no cleaning solutions/no cleaning time/no drying time/no reassembly time... by not having to O2 clean cylinders for recreational NITROX (MAX 40%) users...
Warren...
I've yet to fill from a station which didn't deliver nitrox compatible air. Based on my experience I guess "hyperfiltered" is the norm here on the right side of the pond.Hyperfilters are bunk if you take care of your fill system in any marginal way,
I don't know, but I wouldn't guess so. As I said, I've never even seen a hyperfilter, and I've never seen a compressor system that was even a little taken care of fail to make OCA.I've yet to fill from a station which didn't deliver nitrox compatible air. Based on my experience I guess "hyperfiltered" is the norm here on the right side of the pond.
I've yet to fill from a station which didn't deliver nitrox compatible air. Based on my experience I guess "hyperfiltered" is the norm here on the right side of the pond.
Interesting. I would say I double filtered when I was running a commercial fill station, I had a prefilter and a final filter, as well as a sintered filter to remove final moisture and first oil.When Nitrox first started to be used in the UK we had the same arguments that some places wouldn't fill O2 cleaned cylinders with air. Initially because the Nitrox labelling would be confusing, then because the air wasn't doubled filtered.
The first argument held little water - air is Nitrox.
The second had some validity. Then people started asking questions about the air quality. Now, I don't think anyone supplies air that isn't double filtered. Even people with private compressors double filter.
-- Single filtering should produce air that is safe for PP filling (as Wookie says). The double filtering is to protect against filter failure, where the adverse effects of mixing a hot oily gas with pure O2 isn't to be recommended.
In the old days (pre double filtering), you used to hear of an 'oily fill' where the filters had failed. I can't remember the last time I heard of a bad air fill.
I am very surprised double filtering isn't standard across the USA.
Actually, DOT requires not only a contents label but a hazard class label every cylinder filled at a fill station and offered for transportation.
CGA does as well.
No. The nitrox band was an invention by Bob Olson to advertise.DOT says nothing about a nitrox band, lol