these are out of hydro- do i even want them?

[HamTrainChickenLaser]

I know nothing about scuba cylinders really and have only dove in warm water, but trying to get set up for quarry diving here in Ohio. Losing weight and just got into a 8mm wetsuit. Seller is close to me and wants $300 for four of these HP100s and guarantees they will pass hydro (they are out of hydro now). I would only dive them as single tanks. I mean maybe years in the future as sidemount but who knows on that.

Does this renewal apply to these cylinders?

https://irp.cdn-website.com/ab3ff06f/files/uploaded/NAFEDILASSOC_2581_G3_PST%20Approved%20Permit%20Renewal%20DOT-SP%209791.pdf.pdf

Do these take weird valves that will be expensive to replace when that time comes? Or if I have to do it immediately? They are set up as twins now but I don't think I will ever dive them that way- not sure though I suppose anything is possible. But he has the plugs so they can be separated and used as singles which is my intent.

Am I just burning my money here or is this an OK buy? Is made in Japan/ASAHI good or bad? Or doesn't matter?

Do these apply???

https://www.ctcseminars.com/files/technical/PST%20Tecnical%20bulletin%20D100.pdf

https://www.ctcseminars.com/files/technical/PST%20Technical%20Bulletin%20D101.pdf

So people that have tanks like these- do you actually print that stuff out and give it to the hydro people? Or is that silly because everyone knows already???

 

[HamTrainChickenLaser]

Is that what these are?

 

[flymolo]

Nah, they are Asahi spun steel 100s. They are heavier than the PST100s you highlighted above. As single tanks i'm sure they'd be alright and 300 dollars for 4 tanks is a good deal

 

[HamTrainChickenLaser]

Nah, they are Asahi spun steel 100s. They are heavier than the PST100s you highlighted above. As single tanks i'm sure they'd be alright and 300 dollars for 4 tanks is a good deal

OK, cool- so how do I find the specs for these tanks?

 

[inquis]

From an old retail posting:
DIAMETER: 7.29 inches LENGTH: 25.2 inches WEIGHT EMPTY: 36.4 lbs BUOYANCY FULL: -12.1lbs BUOYANCY WITH 500 PSI: -5.2lbs
Matches the consensus about the ~5 lb [eta: negative] empty buoyancy from past threads here.

 

[HamTrainChickenLaser]

From an old retail posting:
DIAMETER: 7.29 inches LENGTH: 25.2 inches WEIGHT EMPTY: 36.4 lbs BUOYANCY FULL: -12.1lbs BUOYANCY WITH 500 PSI: -5.2lbs
Matches the consensus about the ~5 lb empty buoyancy from past threads here.

Great info, thank you!!! These are sounding better and better for my thick wetsuit in cold water diving.

That listing that you linked (thank you!!!!) says that it's a 3/4" inlet, so these take normal valves?

 

[HamTrainChickenLaser]

Wait- it says the specs are for an HP98?

This is a fantastic HP100 Steel Cylinder Tank for you next scuba dive.

Features of this wonderful tank include:

High Quality Spun Steel - Made in Japan

COMES WITH A Harrison CONVERTER VALVE THAT CAN BE CHANGED TO BE USED WITH DIN OR YOKE

Manufacturing Process: Built from Chromium Molybdenum steel plates. Utilizes the spun process. This process yields a cylinder with a very uniform wall thickness resulting in a lighter, more efficient cylinder.

Buoyancy: Superior buoyancy characteristics. These cylinders have been designed to be slightly negative at the end of a dive.

Exterior Finish: Shot Blast - Zinc spray coating - powder paint. Interior Finish: Shot Blast - Highly-resistant to internal rusting.

Valves:Model High Pressure Converter Yoke/Din Valve #HSV-C-3442. Scuba steel cylinders include a high pressure design valve. Standard inlet thread (3/4"-14 NPSM).

Boots: A high quality boot is included.

TANK SPECIFICS for the HP98:

DIAMETER: 7.29 inches

LENGTH: 25.2 inches

WEIGHT EMPTY: 36.4 lbs

BUOYANCY FULL: -12.1lbs

BUOYANCY WITH 500 PSI: -5.2lbs

Chromium Molybdenum steel construction Inlet thread is standard 3/4"-14 UNF-2B

Negatively buoyant throughout the dive

Manufactured to DOT-E12079-3442

 

[Tracy]

They are Asahi spun HP100s. Good tanks, bit heavy for doubles but great as single tanks. They take a 7/8 valve but not really any reason you would need to change them unless you were building them into doubles. Price is very reasonable.

 

[lostsheep]

They are Asahi spun HP100s. Good tanks, bit heavy for doubles but great as single tanks. They take a 7/8 valve but not really any reason you would need to change them unless you were building them into doubles. Price is very reasonable.

Hard to tell from the first pic but it appears as though they have left and right side valves.

@HamTrainChickenLaser , are they left and right valves? If so do they have the manifold?

The 7/8s valves can be a bit annoying to deal with. Parts can be harder to find or expensive.

 

[Redtwo]

Don'tbknow anything about US tanks but why would you want 4 tanks if you only dive singles. A second tank if you wanna do two dives and no fill possible i can imagine. But even if it is a good deal it sounds like more tanks than you need (making it a not so good deal after all). I would try and buy just 2