PST’s hot dip cylinders and others on the market?

[batmanusa]

Ahh, got it. Thanks to everyone for your help; after your counsel and a little more Google I think Worthington will more than suit my needs. I’m sure many of you can care less, but I would feel a bit rude if I didn’t say why I chose Worthington. It’s quite simple actually. To me it boils down to hoops. Though PST cylinders can suit my needs, availability seems to be a problem. For example, ScubaToys lists PST E7 120 at $349.00 but product is not currently available. This is a common theme. One LDS is very creative. He has it available today on back order. If I pay now I’ll be one of the first to receive my tank as a VIP service. He said this with a straight face BTW. Well, since PT Barnum is dead and Johnny Cochran only a few years deceased I figured this may be my only opportunity to meet one of his caliber in person. So I did what any star-struck red-blooded American would do, I asked the next question. How long would it take for a VIP (like me -- Yaaah mom I made it!) to get a cylinder. Well, he said, “since the dive season is almost over and the holiday season is approaching, as a VIP you should have it by the time you need it since the dive season is only a few months away.” Ohhhhkaaaayy, with a pair like that, how could he walk? Definitely negative. This was making my day. Hell with the cylinder, with Wellingtons I’d go back to this shop just to watch this guy rise to the U.S. Senate. Anyway, despite the circular reasoning he didn’t have it nor could he get it in a reasonable amount of time for me. I don’t have a dive season; I dive year round. In addition it appears that the Pressed Steel company that produced my two hp 100s no longer exists. After reading their public information, PST is a new company, relatively speaking. This does not make it a bad product. Just new to me, like Worthington. But harder to get and more expensive with no quality advantage. ​

I just have to jump through too many hoops to get one.
Thanks again everyone.
Bat

 

[Hoosier]

Where are the Worthingtons made?

In your back yard... Canada...

 

[spectrum]

Neither the PST E7-100s nor the W X7-100s go positive. The E7-100s are -1 lb empty where the X7-100s are -2.5 lb empty. Different problem from an AL80.

That was my point.

 

[John_B]

So why not a Worthington LP85? No need to give up the galv. coating.

The Fabers are a little lighter, a little longer, and a little skinnier. Great as a single tank. And I'll double them up eventually.

John

 

[Jimmer]

In your back yard... Canada...

Tilbury Ontario to be exact.

 

[CompuDude]

I got a call from the US Faber rep on another topic, and I asked why no galvanized Fabers. He said Faber has determined that the hot process amounts to an additional heat treat to the alloy. The concern was the metallurgy of the steel underneath. That's a concern for quality.

I call BS. PST made hot dipped galv cylinders for years. There was no issue with the metallurgy.

 

[oxyhacker]

Well, they did have to come up with the extra pretest rounding out/exercise cycle, described in Technical Bulletins D-100 and 101 in order to get the galvanized tanks to ace the hydro.

I call BS. PST made hot dipped galv cylinders for years. There was no issue with the metallurgy.

 

[Stu S.]

There are chrome-molybdenum steels that are affected by the temperature that hot dip galvanization process runs at. That temperature is 815 to 850 degrees F. The result of this heating is an increase in the steel's ductility, which means the ability to stretch.

Again, the effects of the heat depends on the exact alloy. Hopefully, Worthington has it figured out. My daughter and dive pal Greg use that brand.

The Faber man may not be blowing smoke.

 

[XS Scuba]

All of the steel cylinders which we have manufactured for us by Worthington Cylinders undergo a quench and temper heat treatment. Tempering is the final heating stage and is performed at temperatures ranging from 1200F - 1235F in the case of our particular alloys and individual chemistries. The cylinders are held at these temperatures for a minimum of 40 minutes to achieve uniform and desired mechanical properties. In order to alter the mechanical properties, the cylinders must be exposed to or very near these temperatures for a significant amount of time.

Hot dip galvanizing takes place at approx 830F for 5 - 7 minutes. This is not near the prior tempering temperature of the material nor is it a significant amount of time.

Worthington has also performed post galvanizing tensile tests along with post galvanizing hydrostatic tests with no appreciable variance from original batch results.

Understandably, if one had absolutely no control over the galvanizing process whatsoever, who knows what detrimental effects could result. That is not the case with our process.

There are chrome-molybdenum steels that are affected by the temperature that hot dip galvanization process runs at. That temperature is 815 to 850 degrees F. The result of this heating is an increase in the steel's ductility, which means the ability to stretch.

Again, the effects of the heat depends on the exact alloy. Hopefully, Worthington has it figured out. My daughter and dive pal Greg use that brand.

The Faber man may not be blowing smoke.

 

[keyshunter]

All of the steel cylinders which we have manufactured for us by Worthington Cylinders undergo a quench and temper heat treatment. Tempering is the final heating stage and is performed at temperatures ranging from 1200F - 1235F in the case of our particular alloys and individual chemistries. The cylinders are held at these temperatures for a minimum of 40 minutes to achieve uniform and desired mechanical properties. In order to alter the mechanical properties, the cylinders must be exposed to or very near these temperatures for a significant amount of time.

Hot dip galvanizing takes place at approx 830F for 5 - 7 minutes. This is not near the prior tempering temperature of the material nor is it a significant amount of time.

Worthington has also performed post galvanizing tensile tests along with post galvanizing hydrostatic tests with no appreciable variance from original batch results.

Understandably, if one had absolutely no control over the galvanizing process whatsoever, who knows what detrimental effects could result. That is not the case with our process.

Do the HP Worthingtons require a hydro "protocol" similar to the PST's?