Question Older steel tank size

Please register or login

Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

Benefits of registering include

  • Ability to post and comment on topics and discussions.
  • A Free photo gallery to share your dive photos with the world.
  • You can make this box go away

Joining is quick and easy. Log in or Register now!

Messages
2
Reaction score
2
Location
Okinawa
# of dives
100 - 199
Hello everyone,

Got three steel tanks for free, hydro passed , vis was great and have been diving them, both are narrow neck Hp deep din. I think they are 120s but not sure. They measure 71.5ish cm tall and about 17.5 cm dia. Heavy has hell but I get tons of bottom time with them.

Can anyone identify was size they might be?
 

Attachments

  • IMG_3655.jpeg
    IMG_3655.jpeg
    233.5 KB · Views: 46
  • IMG_3654.jpeg
    IMG_3654.jpeg
    212.5 KB · Views: 41
If they are indeed 15.3L volume at 3500 psi, that works out to 122 cuft including non-ideal gas compression effects.
 
Hello everyone,

Got three steel tanks for free, hydro passed , vis was great and have been diving them, both are narrow neck Hp deep din. I think they are 120s but not sure. They measure 71.5ish cm tall and about 17.5 cm dia. Heavy has hell but I get tons of bottom time with them.

Can anyone identify was size they might be?
great deal no matter what size they are.
 
Hello everyone,

Got three steel tanks for free, hydro passed , vis was great and have been diving them, both are narrow neck Hp deep din. I think they are 120s but not sure. They measure 71.5ish cm tall and about 17.5 cm dia. Heavy has hell but I get tons of bottom time with them.

Can anyone identify was size they might be?
Your cylinders have same markings, and same height, as my PST HP120's (which were sold as Sherwood Genesis HP 3,500 psig cylinders). But my cylinders have outer diameter 7.25" (= 18.4 cm), same as an Alum 80.

ETA: See SCUBA Cylinder Specifications – Huron Scuba, Snorkel & Adventure Travel Inc. PADI 5 star IDC in Ann Arbor, MI.

rx7diver
 
Wow I appreciate the response, thank you for the confirmation. I sort of eye balled size, but good to know, I thought they might be 100s but the amount of bottom time I get I was suspicious that couldn’t be the case.
 
Wow I appreciate the response, thank you for the confirmation. I sort of eye balled size, but good to know, I thought they might be 100s but the amount of bottom time I get I was suspicious that couldn’t be the case.
The 3,500 psig HP120 is ~28" tall. The 3,500 psig HP100 is ~24" tall. And the 3,500 psig HP80 is ~20" tall. All three have OD = 7.25" (same as an Alum 80).

The HP120 is a bit too tall for me to dive comfortably as a BM single; the HP100 is perfect for me for this. (I am 6'2" with longer legs and shorter torso.)

But HP120 BM doubles were perfect for me when diving dry; HP100 BM doubles were a bit too short for me to dive comfortably--although HP100 BM doubles were exactly what I dove when I first began extended range diving in the Great Lakes (tons of gas for me for this, favorable buoyancy characteristics for drysuit diving, not terribly heavy out of the water). I switched to HP120's later, when I needed more gas for deeper/longer exposures.

rx7diver
 

Back
Top Bottom