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I have an 1800 PSI cylinder from the early 1970s that was manufactured as a dive cylinder (yellow paint, 3/4" npsm threads). It's floaty and low capacity and therefore not much use for diving. I use it for shop air. It's lighter than an LP72.

CO2 cylinders have required 5 year hydros since the dawn of the carbonated beverage industry.

Back in the early days of paypal and eBay I was charged twice for the same transaction. Paypal declined to reverse the charges and suggested that I contact the seller for a refund. Ultimately, the seller did refund the money, and that was the end of the matter. Occasionally I sell things for...

My wife, who does not dive, has over the years come to suffer several interrelated medical conditions that affect her mobility and stamina. She likes to swim and snorkel. We have a boat; I encourage her to swim from the boat. We anchor in shallow water, usually 3-4 feet. Generally, it is...

I don't use 18650s for anything except my dive lights. Sure, they're built into the packs for my power tools and so on, but the only thing I use the bare 18650s for is dive lights. I use AA and AAA cells for all kinds of stuff and C cells for a few things. So it's a cell type I wouldn't have...

My DGX800 light failed after several years of use ::shrug:: Nothing lasts forever. I have come to the conclusion that Li-ion batteries are not necessary for the type of diving I do and so I would like to take this opportunity to switch to a light that uses NiMH. I have had excellent results...

Sounds like Wazee. I like to help people. I like to dive with my kids. But sometimes I like to be by myself, in a remote area, where I can focus on my own dive without keeping a watchful eye on someone else. A fact to consider is that it is a tiny minority of divers who ever become...

Do you have a source for that? It appears to me that a good deal of the thread corrosion had to have occurred after the valve was removed.

It varies from state to state and depends on the dive shop. In Minnesota, there are inspection and insurance requirements for high-pressure containers. There is an exemption for DOT cylinders used in compliance with DOT regulations. It is cheaper and less burdensome to comply with the DOT...

That sounds easy but may require a large impact wrench to accomplish.

I believe what you have is a pair of what are usually called LP53s with 1" NGT necks. I have one (a single cylinder) that I use for shop air, but it has a standard neck. The capacity is around 52-53 cf at 1980 PSI. However, since those particular cylinders do not appear to have been + rated...

DGX has 3360 PSI burst discs which are pretty close.

Why would an ABO cylinder be galvanized? Aren't most ABO cylinders 3HT rather than 3AA?

If traveling with the bp/w in a bag: * I remove the cam bands and fold them * Remove the wing and fold/roll it * Pull the crotch strap up flat on the front of the BP (in the channel) * Flatten and cross the shoulder straps * Wrap the waist belt around the back and then to the front, fastening it...

It's more complicated than that. Hydro places all use the test pressure of 5250 stamped on the cylinder. True hot-dipped galvanized HP cylinders, for reasons that are poorly understood, go out of round by a tiny amount (thousandths of an inch). At hydro, the PST cylinders are subject to a...

HP cylinders were originally designed around a test pressure of 5250 and a working pressure of 3500 PSI. I'm uncertain of the exact details but yoke valve connections have a maximum permitted pressure that is around 3300 PSI or 230 bar, so the original HP cylinders had DIN valves and 7/8" necks...

That's just because you've been taking to a place that doesn't have the REE on file (in the case of the Norris from 1959). There are places that have that information in their files, and that will stamp it with a +, including the place I use. (While it is possible for cylinders to pass hydro...

There have been multiple near misses reported on SB where there was a sudden loss of gas due to mechanical problems with the tank, valve, or first stage. Among these: 1) Clogs due to large particles in the cylinder. 2) Delamination of the first stage valve seat 3) Rupture of the first stage...

For general diving yoke attachments work fine but there are reasons you want to use DIN on a slung pony. In general, slung ponies are dived with the valve off (though the reg should be charged before the dive). This poses two problems for yoke regulators: 1) It is easy to mix up the valve...

1) Most solo divers believe you still need a secondary on your back gas. 2) Former SB participant DumpsterDiver does this and then uses an Air2 as a secondary for back gas, however, he uses a back mounted pony rather than a slung one. 3) If you're going to be a solo diver you have to cultivate...