Chapter 1- Diving Equipment Diving Equipment 5 SCUBA CYLINDER SPECIFICATIONS ADVERTISED VOL. CAPACITY (CU.FT.) SERVICE OVERFILL CUBIC LENGTH DIAMETER EMPTY WT. BUOYANCY (SEA WATER) ALLOY FT3 LITERS RATED @10% O.F. PRESSURE PRESSURE INCHES (INCHES) (INCHES) (LBS.) EMPTY FULL Steel 15 428.6 14.24 15.65 3000 3300 120 13.80 4.00 0.75 -1.300 -2.5 Alum. 14 400 14.06 - 2015 - 176 16.60 4.40 05.4 3.20 2.1 Alum. 50 1428.6 50.43 - 3000 - 425 19.00 6.90 21.5 2.25 -1.8 Steel 45 1285.7 40.99 45.05 2015 2216 513 19.10 6.80 20.0 1.40 -2.2 Steel 38 1085.7 37.86 - 1000 - 530 19.10 6.80 20.0 1.40 -1.6 Steel 42 1200 38.00 41.77 1800 1980 532 19.10 6.80 20.1 1.40 -1.9 Steel 52.2 1491.4 47.43 52.14 2250 2475 532 19.37 6.90 22.0 neutral -4.2 Steel 53 1514.3 47.43 52.14 2250 2475 532 19.10 6.80 20.5 1.40 -2.8 Alum. 63 1800 63.13 - 3000 - 532 18.70 7.25 25.1 0.80 -3.04 Steel 71.4 2040 65.15 71.39 3000 3300 549 20.47 6.84 28.6 -4.600 -10.3 Alum. 72 2057.1 72.39 - 3000 - 610 26.00 6.90 28.5 3.60 -1.8 Steel 55 1571.4 44.79 49.23 1800 1980 627 22.50 6.80 20.8 2.40 1.4 Alum. 80 2285.7 79.87 - 3000 - 673 26.40 7.25 33.3 4.00 -1.9 Alum. 80 2285.7 80.70 - 3000 - 680 27.00 7.25 34.5 4.10 -1.9 Steel 71.2 2034.3 65.08 71.55 2250 2475 730 25.00 6.80 29.5 3.50 -2 Alum. 71.2 2034.3 71.55 - 2475 - 730 28.80 6.90 30.6 10.600 5.2 Steel 75.8 2165.7 69.39 76.29 2400 2640 730 2618 6.76 29.3 1.50 -4.6 Steel 94.6 2702-9 or 86.63 95.25 3000 3300 730 25.00 7.00 39.0 -6.000 -13.3 molybdenum steel alloy used in scuba cylinders. Aluminum alloy cylinders will have the designation “3AL.” Until 1977 aluminum cylinders were stamped “SP6498” for the Special Permit under which they were manufactured. Then, until 1982 the stamp became “E6498” when the Permit was succeeded by an Exemption. Beginning in 1982, these older aluminum cylinders were overstamped with 3AL as they were retested. • Service pressure: Some common service pressures for steel cylinders are 2250, 2400, and 3,000 psi. For aluminum cylinders the most common pressure is 3,000 psi. • Serial number: This number is unique to each cylinder. You should record this in your equipment record so you will have the information incase your cylinder is stolen or lost. • Manufacturer’s name or symbol: This is required on cylinders manufactured in the USA after 1982. Prior to that date the name of the company selling the cylinder usually appeared. • Hydrostatic test date and testing facility symbols: All registered testing facilities are required to stamp their symbol on the cylinder. It is placed between the month and the year of the test date. On a steel cylinder you may find a “+” sign after a test date. If the “+” appears after the current date, it means that the cylinder may be overfilled by 10%. The 10% overfill pressure was introduced during World War II and has been in effect ever since. Steel cylinders are usually referred to in terms of their capacity when overfilled by the 10%. In other words, a steel “72” or “71.2” contains approximately that volume of air when it is filled to 2475 psi (2,250 psi plus 10%). The chart of cylinder specifications (table 1-1) will help clarify this. For a cylinder to safely be charged to 10% beyond its service pressure, it must pass a special elastic or 96 2742.9 Steel 95.1 2717.1 85.98 95.62 2400 2640 915 23.82 8.02 37.2 1.50 -6.2 Steel 103.5 2957.1 or 96.01 105.550 2400 2640 1010 26.50 7.80 44.0 neutral -8.2 or 104 2971.4 TABLE 1-1. CYLINDER CHARACTERISTICS
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