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Opinions on PST HP 100 steel tanks
Lugnut09 - 2/07/2015 9:33 PM
Category: General
Replies: 9

Looking for any information, pros or cons with PST steel tanks. Thank you in advance.
Agojo - 2/08/2015 3:34 AM
Read this, won’t be able to get a hydro.

Dear Customers,
This is very time sensitive, so please act quickly! This is regarding HYDROS for PST STEEL TANKS ONLY! The company, Pressed Steels, has gone out of business and therefore, there is no application on fill with the Department of Transportation to renew the hydro permits that are needed for these particular tanks. Please be aware, Ocean Enterprises has NEVER sold this type of steel tank. If you’ve purchased any steel tank from Ocean Enterprises, there is nothing to worry about! If you have purchased an PST steel tank from another location, YOU MUST BRING IN YOUR TANK TO OCEAN ENTERPRISES BEFORE TUESDAY, JAN. 27TH IN ORDER TO RECEIVE YOUR LAST HYDRO. This will allow you to at least use your tank for another 5 years. If you DO NOT bring in your tank before this date, you will NOT be able to get it hydro’d again. This is the LAST TIME these tanks can be hydro’d.

To know if you have a PST steel tank, please look for the following information that will be stamped on the neck of the tank...
1. It will be marked with E9791 or SP9791
2. It will say PST
3. The working pressure will be either 3442 or 3500
4. The tank will be gray, black, blue, or yellow

If you have any questions, please contact Brett in our Service Department. (858)565-6054
LatitudeAdjustment - 2/08/2015 5:08 AM
Good news, bad news. It’s been renewed but will expire again in December 2018, assuming it doesn’t get renewed again these could be made into art or mailboxes in 2023.

If you own PST tanks you might want to print this PDF out and take if with you for fills and hydro’s
Lugnut09 - 2/08/2015 5:12 AM
Thanks for the info about the Hydro. Any views about how they dive?
searly28 - 2/08/2015 1:38 PM
I was looking at the PST steel tanks a while back. Read something about having to pre-stretch them to get a accurate Hydro on them for certification. Some had flunked for not following the special instructions. There was a page with the instructions that I downloaded for a friend, at the time, but don’t have it any longer. This was an issue with the way they galvanize the tank, as I recall. I finally went with the Faber HP100. For what it’s worth.
LatitudeAdjustment - 2/08/2015 3:29 PM
From Lugnut09: Thanks for the info about the Hydro. Any views about how they dive?

My steel tanks are Faber’s also but any steel tank will require you to wear less lead, mine are 6 pounds less than when using my aluminum tanks because as steel tanks empty they sink, aluminum tanks float. Just remember that when you take off your BC in the water behind the boat, if you don’t add air you’ll be in the market for a whole new rig :(
john_f - 2/09/2015 2:25 PM
I may be mistaken, but I think that if SP-9791 is allowed to expire it is illegal to fill the cylinders regardless of hydro/vip status. Maybe someone in the know will chime in.
john_f - 2/09/2015 2:31 PM
I have Worthington steels with galvanize finish. The galvanized tanks are the ones that require a pre-stretch. It has to do with the way the finish affect the flexing of the tank. I had some failed that were really ok. XSScuba contacted the hyrdo facility and straightened them out. Also, the usual method of measuring the % of tank stetch does not apply. There is a number (REE) on the tank instead that used to determine if the tank passed or failed. If the % of stretch method is used a good galv tank will fail usually.
searly28 - 2/10/2015 4:42 AM
I had a Worthington HP119. Never had a problem with the hydro on it. The instructions I ran across online was aimed specifically at the PST tanks. Don’t remember why though, other than it was a stretch issue, as John has mentioned. Wasn’t a problem as long as the facility doing the hydro knew what to do.
Lugnut09 - 2/10/2015 12:39 PM
Thank you everyone!