Date: January 4, 2001
Subject: Staged Bottles
Quick sampling of stage tank specifications.
| Stage Tanks | |||||||||||
| Salt | Salt | Salt | |||||||||
| MFR | Tank Material | Typ | Size | Full PSI | Full cu ft | Fill PSI | Fill cu ft | Empty lbs | Buoy Full | Buoy Empty | Appx Buoy |
| Luxfer | AL | HP | 30.0 | 3000.0 | 30.0 | 2000.0 | 20.0 | 11.6 | -1.0 | 1.2 | -0.27 |
| Luxfer | AL | HP | 40.0 | 3000.0 | 39.9 | 2000.0 | 26.6 | 15.2 | -0.8 | 2.2 | 0.20 |
| Luxfer | AL | HP | 80.0 | 3000.0 | 78.2 | 2000.0 | 52.1 | 35.0 | -3.6 | 2.3 | -1.63 |
| OMS | Steel | LP | 46.0 | 2640.0 | 46.0 | 2000.0 | 34.8 | 17.6 | -4.0 | 0.0 | -3.03 |
| OMS | Steel | LP | 66.0 | 2640.0 | 66.0 | 2000.0 | 50.0 | 25.0 | -5.2 | -1.7 | -4.31 |
| OMS | Steel | LP | 85.0 | 2640.0 | 85.0 | 2000.0 | 64.4 | 31.0 | -6.7 | 0.0 | -5.08 |
| Faber | Steel | LP | 75.8 | 2400.0 | 75.8 | 2000.0 | 63.2 | 26.2 | -6.5 | -1.7 | -5.70 |
AL
vs. Steel has good and bad points.
|
Aluminum |
Steel |
| * Wear
more lead if all AL used (marginally) * Tank track better in slipstream * Offsets negative buoyancy of steel doubles * Less Buoyancy swing from full to empty (AL40 vs. Steel 46) * Unneeded cu ft in tank for the gas needs * so on |
* small
tanks due to lower working pressure * same bulkiness, less streamline * typically no weight belt and very heavy * nothing left to ditch * so on |
Thoughts,
I know there is many more points to discuss. AL makes the best staged deco bottles. AL or
Steel is a good hang or backup
O2 bottle.
Preference is an AL 40 cu ft for typical deco and AL 80 cu ft for longer and
deeper expeditions.
| Standard Tanks | |||||||||||
| Salt | Salt | Salt | |||||||||
| MFR | Tank Material | Type | Size | Full PSI | Full cu ft | Fill PSI | Fill cu ft | Empty lbs | Buoy Full | Buoy Empty | Appx Buoy |
| Faber (SP) | Steel | HP | 72.0 | 3000 | 71.4 | 3300.0 | 78.5 | 29 | -11.3 | -5.9 | -11.84 |
| Faber (SP) | Steel | LP | 76.0 | 2400 | 75.8 | 2640.0 | 83.4 | 59.5 | -6.5 | -1.7 | -6.98 |
| Faber (SP) | Steel | LP | 95.0 | 2400 | 95.1 | 2640.0 | 104.6 | 37.6 | -8.5 | -1.2 | -9.23 |
| OMS | Steel | LP | 85.0 | 2640 | 85.0 | 2640.0 | 85.0 | 31 | -6.7 | 0.0 | -6.70 |
| OMS | Steel | LP | 98.0 | 2640 | 98.0 | 2640.0 | 98.0 | 38 | -7.7 | 0.0 | -7.73 |
| OMS | Steel | LP | 112.0 | 2640 | 112.0 | 2640.0 | 112.0 | 41 | -8.0 | -1.0 | -8.00 |
| OMS | Steel | LP | 125.0 | 2640 | 125.0 | 2640.0 | 125.0 | 45 | -9.5 | 0.0 | -9.50 |
| OMS | Steel | LP | 131.0 | 2640 | 131.0 | 2640.0 | 131.0 | 47 | -10.3 | 0.8 | -10.30 |
| PST | Steel | HP | 65.0 | 3500 | 65.0 | 3500.0 | 65.0 | 24 | -1.5 | -3.00 | |
| PST | Steel | HP | 80.0 | 3500 | 80.0 | 3500.0 | 80.0 | 26 | -7.2 | -2.5 | -7.22 |
| PST | Steel | LP | 80.0 | 2400 | 80.0 | 2640.0 | 88.0 | 32 | -0.5 | -1.05 | |
| PST | Steel | LP | 95.0 | 2400 | 95.0 | 2640.0 | 104.5 | 42 | -4.8 | -1.2 | -5.11 |
| PST | Steel | HP | 100.0 | 3500 | 100.0 | 3500.0 | 100.0 | 31 | -7.3 | -1.4 | -7.26 |
| PST | Steel | LP | 104.0 | 2400 | 104.0 | 2640.0 | 114.4 | 45 | -4.2 | -0.7 | -4.52 |
| PST | Steel | HP | 120.0 | 3500 | 120.0 | 3500.0 | 120.0 | 36 | -7.2 | -0.4 | -7.22 |
| PST | Steel | LP | 120.0 | 2400 | 120.0 | 2640.0 | 132.0 | 50 | -3.8 | -0.4 | -4.14 |
| Seagate | Steel | HP | 80.0 | 3500 | 80.0 | 3500.0 | 80.0 | 27 | -8.0 | -1.0 | -8.00 |
| Seagate | Steel | HP | 100.0 | 3500 | 100.0 | 3500.0 | 100.0 | 33 | -8.2 | 0.5 | -8.20 |
| Seagate | Steel | LP | 104.0 | 2400 | 104.0 | 2640.0 | 114.4 | 0.00 | |||
| Seagate | Steel | HP | 120.0 | 3500 | 120.0 | 3500.0 | 120.0 | 38 | -1.0 | 1.0 | -1.00 |
| Seagate | Steel | LP | 120.0 | 2400 | 120.0 | 2640.0 | 132.0 | 0.00 | |||