HP-100 for HP-130

[on_two_wheels]

Did ya try freezerbrn?

 

[Ericlt1]

I know beggars can't be choosers, but I would really prefer a galvanized cylinder.

Did ya try freezerbrn?

 

[Groobie85]

Ill buy your HP100 so you can get a 130!!! email groobie85@yahoo.com if your interested ;and im local

 

[AcePilot]

BTW hp130 Worthington is slightly shorter than AL80
It is fat 8" vs 7.25" AL80
And havy - especially as a set of doubles

130 vs. 80
Service Pressure 3442 psi 3000 psi
True Capacity 131.4 cu ft 77.4 cu ft
Buoyancy* Full - 11.7 lbs. - 1.6 lbs.
Buoyancy* Empty - 2.0 lbs. + 2.8 lbs.
Weight Empty 43.0 lbs. 31.3 lbs.
Outside Diameter 8.00 in. 7.25 in.
Cylinder Length 25.5 in. 25.9 in.

 

[beanojones]

BTW hp130 Worthington is slightly shorter than AL80
It is fat 8" vs 7.25" AL80
And havy - especially as a set of doubles

130 vs. 80
Service Pressure 3442 psi 3000 psi
True Capacity 131.4 cu ft 77.4 cu ft
Buoyancy* Full - 11.7 lbs. - 1.6 lbs.
Buoyancy* Empty - 2.0 lbs. + 2.8 lbs.
Weight Empty 43.0 lbs. 31.3 lbs.
Outside Diameter 8.00 in. 7.25 in.
Cylinder Length 25.5 in. 25.9 in.

How does air in a steel cylinder weigh more than air in a AL one?

Steel: 11.7-1.6=10.1 lb buoyancy swing for 131.4 cf (13.00 cf/lb)
Aluminum: -2.0-2.8= 4.8 lb buoyancy swing for 77.4 cf (16.00 cf/lb)

Just asking.

 

[pernicia]

BTW hp130 Worthington is slightly shorter than AL80
It is fat 8" vs 7.25" AL80
And havy - especially as a set of doubles

130 vs. 80
Service Pressure 3442 psi 3000 psi
True Capacity 131.4 cu ft 77.4 cu ft
Buoyancy* Full - 11.7 lbs. - 1.6 lbs.
Buoyancy* Empty - 2.0 lbs. + 2.8 lbs.
Weight Empty 43.0 lbs. 31.3 lbs.
Outside Diameter 8.00 in. 7.25 in.
Cylinder Length 25.5 in. 25.9 in.

119s and 130s are from a series called X8, 8in diameter.
80,100, 120s are series X7, 7.25in.

 

[pernicia]

How does air in a steel cylinder weigh more than air in a AL one?

Steel: 11.7-1.6=10.1 lb buoyancy swing for 131.4 cf (13.00 cf/lb)
Aluminum: -2.0-2.8= 4.8 lb buoyancy swing for 77.4 cf (16.00 cf/lb)

Just asking.

is not the air, is the material of the tank.

 

[beanojones]

is not the air, is the material of the tank.

But you don't use of the material of the tank.

The given numbers show that air in a steel gives 13cf per pound while air in an AL tank gives 16 cf per pound.

 

[AcePilot]

Ok
something is off
first - delta for X8-130 was calculated from full to apsolutly empty(I think)
for Al80 - from full to (500psi) empty as per web site I copied it from
plus you have to take into consideration the weight of the air in "empty" tank - it is still 1ATA preasure.
Also 3442 psi which is 234ATM is actualy 245ATA

beanojones - you have a typo in your calculations as well
130 data on the left and 80 on the right so you calculations should read:
Steel: -11.7+2.0=-9.7 lb buoyancy swing for 131.4 cf (13.55 cf/lb)
Aluminum: -1.6-2.8= -4.4 lb buoyancy swing for (due to 500psi) 64.5 cf (14.65 cf/lb)

Closer but still not equal ;-)
I guess if I do it properly considering +1ATA for empty tank and weight of the air in empty tank it will be the same

But... it is not a rocket science - approximation is good enough to give you an idea how much less weight you need when switching from AL80 to X8-130
Empty 80 +2.8lb
Empty 130 - 2lb

You can lose 4.8lb of weight and...
Go check your boyancy in the water properly!!!

btw 13.38 cubf is the right number for the volume of one pound of air

 

[Rainer]

Lol, I think the OP is just looking for a HP130.