That's funny, a HP100 is O.8 inches shorter than an AL80
I just went out to my garage where I have a pair of AL80s and a pair of HP100s. Standing upright the HP100 is 3 inches sorter than the AL 80.
---------- Post added December 24th, 2015 at 09:04 PM ----------
[TABLE="width: 100%"]
[TR="bgcolor: #666666"]
[TH="align: center"]Cylinder[/TH]
[TH="align: center"]Service Pressure (psi)[/TH]
[TH="align: center"]Diameter (inches)[/TH]
[TH="align: center"]Height* (inches)[/TH]
[TH="align: center"]Weight Empty (pounds)[/TH]
[TH="align: center"]Buoyancy Full : Empty (pounds)[/TH]
[/TR]
[TR]
[TD]F7 Steel HP80[/TD]
[TD="align: center"]3442[/TD]
[TD="align: center"]7.25[/TD]
[TD="align: center"]20.8[/TD]
[TD="align: center"]28.3[/TD]
[TD="align: center"]- 8.1 : - 1.7[/TD]
[/TR]
[TR="class: evenrow"]
[TD]F7 Steel HP100[/TD]
[TD="align: center"]3442[/TD]
[TD="align: center"]7.25[/TD]
[TD="align: center"]25.3[/TD]
[TD="align: center"]34.0[/TD]
[TD="align: center"]- 8.4 : - 0.6[/TD]
[/TR]
[TR]
[TD]F7 Steel HP120[/TD]
[TD="align: center"]3442[/TD]
[TD="align: center"]7.25[/TD]
[TD="align: center"]29.1[/TD]
[TD="align: center"]39.2[/TD]
[TD="align: center"]- 8.8 : + 0.7[/TD]
[/TR]
[TR="class: evenrow"]
[TD]F8 Steel HP117[/TD]
[TD="align: center"]3442[/TD]
[TD="align: center"]8.00[/TD]
[TD="align: center"]24.2[/TD]
[TD="align: center"]37.6[/TD]
[TD="align: center"]- 9.1 : + 0.2[/TD]
[/TR]
[TR]
[TD]F8 Steel HP133[/TD]
[TD="align: center"]3442[/TD]
[TD="align: center"]8.00[/TD]
[TD="align: center"]26.9[/TD]
[TD="align: center"]42.4[/TD]
[TD="align: center"]- 9.1 : + 1.5[/TD]
[/TR]
[TR]
[TD]Comparison Only - Aluminum 80[/TD]
[TD="align: center"]3000[/TD]
[TD="align: center"]7.25[/TD]
[TD="align: center"]26.1[/TD]
[TD="align: center"]31.9[/TD]
[TD="align: center"]- 1.8 : + 3.2[/TD]
[/TR]
[/TABLE]
From the DGX website, the current Faber steel tanks
My HP 100 are XS Scuba and the tank, ignoring valves is 23.5.