which is better Lp or HP steel's

[Scubamedicjoe]

this is something I just done understand !!!
hear is why , one shop says buy Lp tanks another shop says buy HP steel tanks , my self i dive DIN so why wouldnt I want HP steel tanks ,
I am looking at like the HP 100's but thinking about the new tanks I am hearing too ,

 

[notabob]

PST's new series may be the tanks for you. You get both an LP and HP tank in one. They're rated at nearly 3,500 PSI (3440, I think), but can of course be filled to lower pressures as well. The stock valve is a DIN with a built-in seamless yoke adapter. Best of both worlds. The E-series 100, for instance, is the same size as the previous generation LP-80, but holds 25% more air at the higher pressure. If you're restricted to diving with a yoke regulator, it'll still hold somewhere between 80 and a 100 cuft at 3000 psi. The other good thing about the E-series is that the tank valve threads have finally been standardized. Older PST HP tanks had a unique thread size that made obtaining suitable tank valves and manifolds much more of a headache.

On the other hand, older generation PST tanks can now be had for peanuts. One local LDS is selling brand new PST LP80s for <$200.

-Roman.

 

[HarleyDiver]

Better is a very subjective thing.

One fact though.
You can usually get a LP overfilled but you will rarely get even a 100% fill in a HP tank.

A LP104 with 3000 pounds (very common) has more air than a HP120 that cools down to 3200-3300 by time you get it home.

Also check the other thread just started over 7.25 in vs 8in tanks.

 

[Genesis]

Then again I have my own compressor

3442 they be rated, 3442 they be filled to.

 

[LUBOLD8431]

In reply to Roman's post:

The new PST cylinders (E-series) are filled to 3442. It doesnt matter if you use the 200 bar DIN or yoke. If you have a yoke regulator that is service rated for the pressure (which most are nowadays), you can still get it filled to 3442.

PST is still making the LP-80, and it has always been cheaper than the others. Also, PST just had a big sale on them... It is one of their most popular cylinders...

Oh, and the valve is a yoke with a DIN insert.

 

[Genesis]

It looks like a Thermo internally and externally.

But the seat is different than the usual Thermo; it gives a very nice "slow" on/off feel. They're one of the nicest valves I've ever had the pleasure of using.

 

[LUBOLD8431]

The valve is made by Thermo. Its a new design... They are definitely a sweet valve...

I never thought I would say this: I love the E-series tanks!!!

 

[drbill]

You've got me quite confused with this statement:

A LP104 with 3000 pounds (very common) has more air than a HP120 that cools down to 3200-3300 by time you get it home.

How could an LP104 at 3000 psu have more air than a HP120 at 3200-3300 psi? I will admit that psychics was my worst subject but this doesn't seem to make sense.

I dive HP120's or HP100's all the time.

Dr. Bill

 

[Uncle Pug]

a HP120 has 120cf at 3500 psi but only 113cf at 3300 psi.

a LP104 has 104cf at 2640 psi but 118cf at 3000 psi.

 

[drbill]

knows how bad I was at physics! Thanks for the explanation. Boyles Law hadn't been discovered when I was certified (at least I can't remember it, but that was the 60's)!

Dr. Bill