Can you get a plus hydro on a HP Tank?

[jgros79]

Hey,

A few years I got a plus marking when I hydro tested my old steel 72 so it could be filled 15% over the psi markings on the tank. Can a HP 100 that fills to 3500 get a + stamp when it gets hydro tested as well? I'm hearing yes and no...any info would be appreciated thanks.

 

[Tracy]

A. It is 10%

B. No

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[halocline]

Hey,

A few years I got a plus marking when I hydro tested my old steel 72 so it could be filled 15% over the psi markings on the tank. Can a HP 100 that fills to 3500 get a + stamp when it gets hydro tested as well? I'm hearing yes and no...any info would be appreciated thanks.

It depends on whether your HP tank is a 3AA standard (the "old" HP tanks) or one of the special permit 3442 PSI tanks, which are much more common. The older 3AA tanks have a working pressure of 3180 so the additional 10% brought them to 3448 PSI. These tanks are very negatively buoyant.

The more common SP tanks (like worthington and faber FX) do not get the plus rating.

 

[Bob DBF]

It depends on whether your HP tank is a 3AA standard (the "old" HP tanks) or one of the special permit 3442 PSI tanks, which are much more common. The older 3AA tanks have a working pressure of 3180 so the additional 10% brought them to [-]3448[/-] 3498 PSI. These tanks are very negatively buoyant.

The more common SP tanks (like worthington and faber FX) do not get the plus rating.

Correction in red.



Math Police
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Hopes you don't need the extra air, but it's there.