Membrane Nitrox Compressor - Herts / N. London

[aclivity]

Coming round to that 02 cleaning time of the year ... just wondering (as I very rarely need to get a fill away from home) if there is a LDS with a membrane nitrox compressor in the Herts / N. London area?

Just to clarify - I'm right in thinking that a membrane compressor doesn't necessarily require my cylinders to be o2 clean?

This may be a bit of a forlorn hope, I'm sure there are lots of reasons why I will be told to cash up and pay for the O2 cleaning, so question 2 is this ... who's cheapest for o2 cleaning in Herts / N. London? My local dive shop charges £25 each for 15l cylinders and last year I also had to pay for the 32% fill on top!

Andy

[Simon TW]

Originally Posted by aclivity

Coming round to that 02 cleaning time of the year ... just wondering (as I very rarely need to get a fill away from home) if there is a LDS with a membrane nitrox compressor in the Herts / N. London area?

Just to clarify - I'm right in thinking that a membrane compressor doesn't necessarily require my cylinders to be o2 clean?

This may be a bit of a forlorn hope, I'm sure there are lots of reasons why I will be told to cash up and pay for the O2 cleaning, so question 2 is this ... who's cheapest for o2 cleaning in Herts / N. London? My local dive shop charges £25 each for 15l cylinders and last year I also had to pay for the 32% fill on top!

Andy

Yes thats right no need for o2 clean if your filling with membrane. There is a 40% rule but I can't think of a membrane that will go higher than 40%. (no doubt someone willl comment on that)

[MATTBIN]

Andy
I posted a reply but I cant see it now, anyway 10quid a cylinder for an 02 clean is more normal. I paid 40 for a clean and fill at Deep Dive Luton for a twinset, 2 tanks and a manifold, plus a twinset fill of 32%.
You could also get a fill if the LDS uses pre-mix you only need 02 clean if they use partial pressure fills i.e. 100% plus a top off.

Matt

[ahar]

As far as I know, all the LDS' in North London use partial pressure mixing. Not sure about the ones outside the M25 though

[Mark Powell]

The vast majority of LDS in this country use partial pressure mixing. There are only 2 or 3 places in the country that I'm aware of that have a membrane system. The same goes for continous blending which also removes the need for O2 cleaning.

The trouble is even if you have a LDS that has a membrane system whenever you go diving in a different area you will be back to partial pressure mixing and so will need O2 clean cylinders.