Tank Warning!

scuba in ontario, scuba ontario, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba, scuba

for the memories......

So like all good divers, it is that time of year when you take your tank in to get hydro's, and VIP's done. In went the tank that I have been using since 1973, complete with all of it's hydro's and everything stamped onto it.

This was not even a hydro year for the tank. Just a VIP and fill.

Then came the phone call.....condemned.

Not because of a bad tank....

Not because of cracks, rust, or being abused......

But because of not being backed by a piece of paper in some office miles away from where the tank has ever dove.

Seems that my tank from 1973 was one of the first to be made as an aluminum tank. Steel tanks were the only authorized types before 1971 , and then the aluminum tank came into being.....

So some news on what is legal and what is not.

I used to dive with a guy that had some old Navy aluminum round bottomed tanks, and hopefully he has ditched them, as they are on the no-no list. They are not supposed to be hydro'ed, filled, or allowed in service, but like my cylinder, many stay in the mainstream.

I have all of my nice hydro stamps all in sequence on the cylinder, and 3 since the tank was supposed to be pulled, but it went through, and all three of the hydro stations that stamped the cylinder could be fined or reprimanded for letting the cylinder through.

The main stamp at the top of the cylinder, SP6688, identifies it as a special permit production by Norris Industries. The permit expired in 1979, as did a permit for Kaiser SP6576. Without this piece of paper a tank becomes illegal to be hydro'ed, filled, or even used. Bad luck for all who have these tanks still. Many fill station and hydro testers are ignorant of the status of these cylinders, or just choose to ignore the illegal status of the cylinders.

So how many of these cylinders are out there? Could be quite a few. The Norris cylinder was not popluar, but there was another in the shop that had mine and was condemned at the same time.

So as a bit of advice and a note for divers, check on the status of older cylinders yourself, and encourage shops to be a bit more mindful of the status of cylinders. For specific details, one could try Professional Scuba Inspectors at

So check those tanks, and see you on the bottom.

Meanwhile, I think I'll make the old tank into a table lamp.......

Thank you to Keith at for the use of this article for our magazine. Look for more articles in the future from their website. Also take a chance to visit them in the future as well, they have several very good articles diving. You can also reach him at


Return to Reviews

Darryls Diving Services On-Line Magazine