Does anyone transfill their tanks?

**matteh99** · 10-20-2009, 06:21 AM

It sounds like you need to make friends with the guy from the welding store.

This site has similar hoses to what you are looking for. I don't see one with a tank connector on each side though.

Niche Gas Products - specialises in gas equipment that can sometimes be hard to get from other suppliers.

Eric

**jbman45** · 10-20-2009, 06:23 AM

What you suggest is ok, but per last note remember when you fill an empty tank from a full one, say 2200 psi; then both tanks will have same pressure, maybe 2000 or 1800psi first fill depending on size of smaller other tank; second fill both tanks will equalize at maybe 1500? or so; so at some point you're going to fill and get 500psi, not very much. So that's why they use a cascade system where you fill from the lowest pressure tank first; then mid range, then top off with your fullest tank and you don't use as much high pressure gas that way. You then rotate tanks down as you use them. It does work well, but you'll need three tanks to make it work right.

**vault** · 10-20-2009, 10:55 AM

Originally Posted by jbman45

What you suggest is ok, but per last note remember when you fill an empty tank from a full one, say 2200 psi; then both tanks will have same pressure, maybe 2000 or 1800psi first fill depending on size of smaller other tank; second fill both tanks will equalize at maybe 1500? or so; so at some point you're going to fill and get 500psi, not very much. So that's why they use a cascade system where you fill from the lowest pressure tank first; then mid range, then top off with your fullest tank and you don't use as much high pressure gas that way. You then rotate tanks down as you use them. It does work well, but you'll need three tanks to make it work right.

good explanation i was wondering why you would need multiple taknks.

**weldingtwopotatoes** · 10-21-2009, 02:03 AM

Very cool website just need to find that here in the US. Shouldn't be to hard now that I know what I'm looking for, thanks for the link. As far as the pressure drop in the tank, it shouldn't be a problem. I will just fill it when my larger tank is full, I just want the smaller tank for its portability. I really like the fact that the 520D is portable and dual voltage I've already taken it to friends houses a couple of times and I want the smaller tank for that.