Life Jackets vs. Scuba Tanks
Comparing 2 standards across 18 specifications. 18 key differences identified.
Personal Flotation Devices (PFDs) and life jackets are regulated internationally under ISO 12402 (Parts 1–9) and US Coast Guard (USCG 46 CFR 160 / ANSI/CAN/UL 12402-5). The ISO standard classifies devices by buoyant force in Newtons: Level 50 (50 N / 11.2 lbf; buoyancy aids for swimmers in sheltered waters), Level 100 (100 N / 22.5 lbf; sheltered water lifejackets with self-righting aid), Level 150 (150 N / 33.7 lbf; offshore self-righting lifejackets), and Level 275 (275 N / 61.8 lbf; ocean expedition lifejackets for foul-weather gear).
Scuba diving high-pressure cylinders and valves are regulated under ISO 9809 (Steel), ISO 7866 (Aluminum), US DOT-3AL/3AA, and EN 250. The world's most common recreational cylinder is the Aluminum 80 (AL80), with an internal water capacity of 11.1 liters (0.39 cu ft), working pressure of 3,000 psi (207 bar), and delivering 77.4 cu ft (2,192 L) of free air. Cylinder valves connect to first-stage regulators via two distinct standards: Yoke (A-clamp / INT; rated to 232 bar / 3,365 psi) and DIN (G 5/8" threaded connection; rated to 232 bar or 300 bar / 4,350 psi).
Specification Comparison Table
18 Parameters| Parameter / Spec | ||
|---|---|---|
|
Level 50 (ISO 12402-5 / Buoyancy Aid)
|
≥ 50.0 Newtons (11.2 lbf buoyancy / for conscious swimmers near shore) | — |
|
Level 100 (ISO 12402-4 / Coastal Lifejacket)
|
≥ 100.0 Newtons (22.5 lbf buoyancy / sheltered waters, turns most conscious) | — |
|
Level 150 (ISO 12402-3 / Offshore Lifejacket)
|
≥ 150.0 Newtons (33.7 lbf buoyancy / automatic self-righting of unconscious user) | — |
|
Level 275 (ISO 12402-2 / Ocean Lifejacket)
|
≥ 275.0 Newtons (61.8 lbf buoyancy / severe ocean storms with heavy gear) | — |
|
CO₂ Cartridge Size (150N Inflatable)
|
33.0 g threaded CO₂ gas cylinder (1/2"-20 UNF thread) | — |
|
CO₂ Cartridge Size (275N Inflatable)
|
60.0 g threaded CO₂ gas cylinder | — |
|
Automatic Firing Mechanism
|
Hydrostatic (Hammar MA1) or Dissolving Paper/Cellulose Pill (Halkey-Roberts) Standard | — |
|
Self-Righting Time Requirement
|
≤ 5.0 seconds to rotate face-up in water under ISO test | — |
|
Aluminum 80 (AL80) Free Air Volume
|
— | 2,192 liters (77.4 cu ft at rated working pressure) |
|
AL80 Working Pressure
|
— | 207.0 bar (3,000 psi / 20.7 MPa) |
|
AL80 Internal Water Capacity
|
— | 11.1 liters (0.39 cu ft internal volume) |
|
AL80 Empty Tare Weight
|
— | 14.2–14.5 kg (31.4–32.0 lbs without valve) |
|
AL80 Buoyancy (Full vs Empty)
|
— | -0.7 kg (-1.6 lbs sink) Full / +1.9 kg (+4.1 lbs float) Empty Seawater Buoyancy |
|
High-Pressure Steel 100 (HP100) Pressure
|
— | 237.0–300.0 bar (3,442–4,350 psi / 12.9L water capacity) |
|
HP100 Buoyancy (Full vs Empty)
|
— | -3.8 kg (-8.4 lbs sink) Full / -1.1 kg (-2.5 lbs sink) Empty Remains negative |
|
Yoke Valve (A-Clamp / INT)
|
— | Max 232 bar (3,365 psi; clamp bracket over captured O-ring) Recreational Standard |
|
DIN Valve Standard
|
— | G 5/8 in Thread (EN 144-2 / ISO 12209) 232 bar (5 threads) or 300 bar (7 threads) |
|
Hydrostatic Test Cycle
|
— | Every 5 Years (at 5/3x working pressure: 5,000 psi for AL80) DOT / ISO Recertification |