question: How do emergency flotation devices inflate quickly?
comment: Generally they have a CO2 cartridge that releases into the vest for quick inflation. There’s a tube you can use to blow it up if that fails.
passages: In the United States, regulations for ditching aircraft are included in Federal Aviation Regulations Parts 27 () and 29 (), and specific guidance is provided in Advisory circulars 27-1B and 29-2C.
  
  Section::::Design.
  
  The most rapid inflation is provided by pressurised helium although some float systems use helium blended with other gases such as nitrogen to slow down the inflation rate.
  
  Section::::External links.
  
  BULLET::::- Zodiac Group: AERAZUR (Cognac, France) and Air Cruisers Company (Wall Township, New Jersey, USA) are two major manufacturing sources for emergency flotation systems requirements. rde09jun09.
   Section::::Specifications.
   To be on the safe side, a pill-activated inflation device is preferred. A small pill that dissolves on water contact is the safest option, as it also works in shallow waters where a hydrostatic activator fails. This type of jacket is called an 'automatic'. As it is more sensitive to the presence of water, early models could also be activated by very heavy rain or spray. For this reason, spare re-arming kits should be carried on board for each life jacket. However, with modern cup/bobbin mechanisms this problem rarely arises and mechanisms such as the Halkey Roberts Pro firing system have all but eliminated accidental firing.
   Most portable dehumidifiers are equipped with a condensate collection receptacle, typically with a float sensor that detects when the collection vessel is full, to shut off the dehumidifier and prevent an overflow of collected water. In a warm humid environment, these buckets will generally fill with water in 8–12 hours, and may need to be manually emptied and replaced several times per day to ensure continued operation.
   The demand valve of a lightweight helmet can also freeflow for some of the same reasons as can happen with a scuba demand valve.
  
  Section::::Open circuit scuba.
   Accessories such as leg straps can be utilized to keep the inflated chambers in position for floating in a stable attitude, and splash or face shields constructed of clear see-through vinyl covers the head and face to prevent water from waves from inundating the face and entering the airway through the nose or mouth.
  
  Section::::Types.:Survival suit.
   Some bladder water guns, such as Speedloaders, Water Worms, and Super Chargers, are inflated with water directly from a garden hose using a quick-fill device (QFD). This allows faster filling, but makes them more limited since they require a hose to work.
  
  Section::::History.
   Emergency flotation system
  
  Emergency Flotation Systems (EFS) are emergency systems installed on larger commercial and military helicopters in order to prevent the airframe sinking in the event of a crash landing on water. The floats may be packed within spaces inside the airframe or as externally mounted packs on the helicopter skids. The floats are inflated using gas stored in pressurised cylinders carried on board the helicopter.
  
  Section::::History.
   Although most pet life jackets are passive devices, there is at least one automatically inflated life jacket available for pets (made by Critter’s Inflatable, LLC). An automatic flotation device is generally more expensive than a foam life jacket, but, like automatic PFDs designed for humans, they are less bulky to wear when not inflated, and when inflated may provide more buoyancy than foam devices. Automatic pet flotation devices are popular in the bulldog community, and also for water therapy where extra support may be needed under the head.
  
  Section::::See also.
  
  BULLET::::- Napoleon Guerin
  
  BULLET::::- Inflatable armbands
  
  BULLET::::- Lifebuoy
   Buoyancy aids are designed to allow freedom of movement while providing a user with the necessary buoyancy. They are also designed for minimal maintenance and as they are only constructed from foam and can be mass-produced inexpensively, making them one of the most common forms of PFDs.
   Various devices such as manual and automatic air vents are used to address free air which floats up to the high points throughout the system. Automatic air vents contain a valve that is operated by a float. When air is present, the float drops, allowing the valve to open and bleed air out. When water reaches (fills) the valve, the float lifts, blocking the water from escaping. Small (domestic) versions of these valves in older systems are sometimes fitted with a Schrader-type air valve fitting, and any trapped, now-compressed air can be bled from the valve by manually depressing the valve stem until water rather than air begins to emerge.
   The air chambers are always located over the breast, across the shoulders and encircle the back of the head. They may be inflated by either self-contained carbon dioxide cartridges activated by pulling a cord, or blow tubes with a one-way valve for inflation by exhalation. Some inflatable life jackets also react with salt or fresh water, which causes them to self-inflate. The latest generation of self-triggering inflation devices responds to water pressure when submerged and incorporates an actuator known as a 'hydrostatic release'. All automatic life-jackets can be fired manually if required. Regardless of whether manually or automatically triggered, a pin punctures the cartridge/canister and the CO gas escapes into the sealed air chamber.
   Section::::Mathematical model: flotation of hinged plates.:Analytical results for maximum load.:Case 1: Small scale formula_58.
   Today these air chamber vests are commonly referred to as 'inflatable life jackets or vests' and are available not only for commercial applications but also for those engaged in recreational boating, fishing, sailing, kayaking and canoeing. They are available in a variety of styles and are generally more comfortable and less bulky than traditional foam vests.
   While the USCG does not certify personal flotation devices for animals, many manufacturers produce life jackets for dogs and cats. Dogs and cats have been known to die from drowning, either because they do not know how to swim, or because they tire out from overexposure or old age, or have a medical complication such as a seizure, or become unconscious.
   In Spray Mode 1, the toy is actuated and propels water from a nozzle located superiorly on the anterior aspect by squeezing a trigger, located toward the rear. A pressure reservoir which is charged by a lateral pumping action of a forward-pointing, superiorly located rod enables actuation.
  
  In Spray Mode 2, the toy spurts "ooze" with each pumping action of a separate, lateral manual handle, located at the inferior aspect of the anterior surface, immediately below the water charging handle. In "ooze" mode, the toy does not store pressure.
  
  Section::::Reception.
   An example of a theme-specific hydraulophone is the Aquatune located at the main entrance to the Legoland waterpark in Carlsbad California. This hydraulophone, which Legoland describes as "a musical water stand", is the centerpiece of the entranceway, and is flanked on either side by educational installation exhibits, such as water tables where participants can build water dams from lego blocks, and learn about laminar and turbulent flows through various flow channels.
  
  Section::::Cold weather hydraulophones.
   Flotation devices are also found in near water-edges and at swimming pools. They may take the form of a simple vest, a jacket, a full-body suit (one piece coverall), or their variations suited for particular purposes. They are most commonly made of a tough synthetic fiber material encapsulating a source of buoyancy, such as foam or a chamber of air, and are often brightly colored yellow or orange to maximize visibility for rescuers. Some devices consist of a combination of both buoyancy foam and an air chamber. Retroreflective "SOLAS" tape is often sewn to the fabric used to construct life jackets and PFDs to facilitate a person being spotted in darkness when a search light is shone towards the wearer.
   Some rebreathers (e.g. the Siebe Gorman CDBA) have a pouch full of lead balls each a bit over an inch diameter. The diver can release them by pulling a cord.
  
  Section::::Types of weight.:Fixed weights.
   Section::::Design and regulation.
  
  Life jackets or life vests are mandatory on airplanes flying over water bodies, in which case they consist of a pair of air cells (bladders) that can be inflated by triggering the release of carbon dioxide gas from a canister—one for each cell. Or the cells can be inflated "orally" that is by blowing into a flexible tube with a one-way valve to seal the air in the cell. Life jackets must also be supplied on commercial seafaring vessels, be accessible to all crew and passengers, and be donned in an emergency.
   A standard APW extinguisher in the United States contains of water in a stainless steel tank. The water is discharged by means of a ½-inch hose, with a smooth-bore nozzle attached to the tip. They will initially produce a 40–50 foot stream of water, with a discharge time of about 50 seconds.
   Wellpoint spears are generally used to draw out groundwater in sandy soil conditions and are not as effective in clay or rock conditions. Open pumps are sometimes employed instead of spears if the ground conditions contain significant clay or rock content. 
  
  Section::::Processes.:Horizontal drainage.
   Section::::Flotation equipment.
  
  Flotation can be performed in rectangular or cylindrical mechanically agitated cells or tanks, flotation columns, Jameson Cells or deinking flotation machines. Classified by the method of air absorption manner, it is fair to state that two distinct groups of flotation equipments have arisen:pneumatic and mechanical machines. Generally pneumatic machines give a low-grade concentrate and little operating troubles.
   BULLET::::- "Airlift pumps" – run on air inserted into pipe, which pushes the water up when bubbles move upward
   Aircraft devices for crew and passengers are always inflatable since it may be necessary to swim down and away from a ditched or submerged aircraft and inflated or foam filled devices would significantly impede a person from swimming downward in order to escape a vehicle cabin. Upon surfacing, the person then inflates the device, orally or by triggering the gas canister release mechanism. Most commercial passenger life jackets are fitted with a plastic whistle for attracting attention. It has a light which is activated when in contact with water.
  