What are the two conditions that a life jacket must meet?

There are two conditions that the life jacket must meet, one is that the welfare must be large enough to easily bear the weight of a person, and the other is that the quality must be very strong.

There are two conditions that my business must meet, one is to wear a good fit, one is that there is nothing that can float up and will not let people sink, and the other is that it is not toxic.

There are only two conditions that must be met, and there are two conditions that are easy to meet, the first is not breathable, to be safe, and the second hardest condition is that you must bear a person.

Because there are only two conditions that must be met, the first condition is that your life jacket must be good and there is no fault, or when you must be in the water for it to work.

One is security, and the second is applicability.

Only with these two points can people choose such life jackets.

There must be no holes, and there must be surface, these are the two most basic conditions that must be met.

The buoyancy of the life jacket should meet the specified standard (the buoyancy shall not be less than kilograms when continuously immersed in seawater for 24 hours. Yuan.

The two conditions that must be met for life jackets are that they must not leak air, and the material must be strong and durable.

I just checked for you, the first is that it can float, and the second is that it must be brightly colored.

There are usually two types of life jacket linings (buoyancy):

1. Polyethylene foam, which is relatively cheap, has sufficient buoyancy and has a wide range of use, but the buoyancy will change by about 5% with the time of immersion in water.

2. EPE pearl cotton, ** more expensive than foam plastic, but light weight and strong buoyancy.

How the life jacket works:

Buoyancy filler life jacket, the letter is made of nylon cloth or neoprene, and the middle is filled with buoyant material. Inflatable life jackets are made of high-strength waterproof materials, similar to the principle of inflatable lifebuoys or swimming rings. It is divided into automatic inflatable type or passive inflatable type.

However, the most important thing to pay attention to in this life jacket is to absolutely avoid sharp objects piercing or wearing out the waterproof layer, which will cause unimaginable serious consequences after air leakage.

How to use the life jacket:

Wear the life jacket and whistle bag facing outward; Pull up the zipper, tighten the front collar strap with both hands, and tie the neck band; The lower straps are crossed and fastened on the left and right sides of the front body; After wearing it, check whether each place is slippery and fast.

According to the principle of buoyancy, it can be divided into buoyancy material filled life jacket and inflatable life jacket.

1. Buoyancy material filled life jacket

The fabric is mostly made of neoprene composite material, with a variety of colors to match, which is fashionable and beautiful. The buoyancy material of the life jacket is polyethylene foam. There is also an internal EVA foam material, which is compressed and 3D three-dimensional molding, and its thickness is about 4 cm (5 6 thin hair materials are produced in China, and the thickness is about 5 7 cm).

2. Inflatable life jacket

It is made of high-strength waterproof materials, similar to the principle of inflatable lifebuoys or swimming rings, and is divided into automatic inflatable or passive inflatable type. However, it is absolutely necessary to avoid sharp objects piercing or wearing out the waterproof layer, as air leakage will cause unimaginable serious consequences.

How it works

Inflatable life jackets have two functions: manual inflation and automatic inflation.

1. Manual inflation: pull the pull rope on the inflator before or after falling into the water to turn the pull rod to no less than 90 degrees, the needle punctures the diaphragm of the gas cylinder, and the high-pressure CO2 gas rushes into the air bag, and the gas expands to produce buoyancy.

2. Automatic inflation: After falling into the water, the life jacket is immersed in the water to soften the water-sensitive element in the automatic device, the firing pin loses its blockage, and the spring extension pushes the firing pin to puncture the sealing membrane of the gas cylinder CO2 gas and injects the airbag to produce buoyancy.

3. The mouthpiece is a one-way valve type, and the one-way valve will automatically close after blowing.

Life jackets are generally divided into two types: inflatable life jackets and foam life jackets. 1. Foam life jacket refers to a fabric made of nylon cloth or neoprene, filled with buoyancy materials such as foam boards, which have enough buoyancy to make the head of the person in the water exposed. Generally, we use marine life jackets.

The inside of the material is made of EVA foam, which is compressed and 3D three-dimensional, and its thickness is about 4 cm (5 6 pieces of thin hair material produced in China, about 5 7 cm thick). Life jackets produced according to standard specifications have their buoyancy standards: generally 24 hours for adults, 5 kg for children, 24 hours, so as to ensure that the chest above the surface of the water.

2. Inflatable life jackets are divided into two types: automatic inflatable life jackets and manual inflatable life jackets, which are made of high-strength waterproof materials, and inflatable life jackets are mainly composed of sealed inflatable vest airbags, miniature high-pressure gas cylinders and fast inflatable valves, etc., which are often used in the work with the possibility of falling into the water. Under normal circumstances (not inflated), the entire inflatable life jacket is draped on people's shoulders and backs like a ribbon, and because of its small size, it does not hinder people's freedom of operation; Once it falls into the water, it can be inflated into a life jacket with 8-15 kg buoyancy in 5 seconds when it encounters danger in the water and needs buoyancy, or it can be automatically inflated and inflated according to the action of the water (fully automatic inflatable life jacket), or the cable on the inflatable valve is pulled by a person (manual inflatable life jacket); The life jacket lifts the human body upwards so that the head and shoulders are exposed to the water, so that they can be safely protected in time. Due to the use of water-resistant and breathable materials on the surface of this life jacket, in addition to paying attention to its buoyancy, it should also be noted that it is absolutely necessary to avoid sharp objects piercing or abrasion the waterproof layer, which will cause unimaginable serious consequences after air leakage, so the inflatable life jacket should be checked for air leakage before use.

1) Put the life jacket around your neck, place the rectangular buoyancy bag in front of you, and tie the strap of the neckline; 2) The left and right straps are passed through the buckle loops on the left and right sides respectively, and crossed around the back; 3) Then pass the strap through the buckle loop on the chest and tie the dead knot. 1) Some life jackets are only equipped with reflective film on one side, and if the reflective film is worn inside, it will not work. 2) Tie the strap into a dead knot so as not to be affected or float for a long time when diving.

3) Pull the cables on the left and right sides, the inflation valve opens, and the life jacket is inflated in a few seconds. The hand-inflatable life jackets on the aircraft are also equipped with a variety of equipment: the power supply of the azimuth indicator is activated by seawater, which can be powered for more than 12 hours; Some are also equipped with whistles, mirrors, etc.

Advice when shopping for life jackets;

1.Life vests should try to choose bright colors such as red and yellow, because if the wearer accidentally falls into the water, it can make it easier for the rescuer to spot you.

2.There should be a life-saving whistle on the life vest for the person who has fallen into the water to whistle for help.

Depending on how you use a life jacket, you can choose this style for entertainment.

If it is rescue, firefighting, training, etc., you can choose the professional one.

The standards for life jackets are set by the International Maritime Organization (IMO). IMO's standards for life jackets include the ISO 12402 series of standards, which include the following different types of life jackets:

1.ISO 12402-2: Life jackets used by crew members and professional lifeguards.

2.ISO 12402-3: Life jackets for water activities such as swimming, sailing, and boating.

3.ISO 12402-4: Roll-saving life jackets for non-aquatic professional activities, such as work and first aid.

4.ISO 12402-5: Life jackets for special activities such as jet flights and big and short dives.

These standards specify requirements for the design, material, buoyancy, visibility, adjustability, comfort, etc., of the life jacket to ensure that the life jacket can effectively provide buoyancy and protection, while ensuring the comfort and visibility of the wearer to increase the chances of finding and finding the rescued. Life jackets also need to meet specific testing standards to ensure their performance and quality.

The premise of having life jackets on board the aircraft is to ensure that passengers and crew can safely evacuate the aircraft and survive in the water in the event of an emergency.

To ensure the safety of passengers and crew on board the aircraft in case of an emergency, airlines have equipped each aircraft with life jackets. A life jacket is a piece of equipment that provides buoyancy and protection in an emergency and is inflatable and equipped with a lifebuoy and other necessary survival tools. In the event of an emergency situation, such as a forced landing or a forced landing on water, passengers and crew wear life jackets and use their buoyancy and protection functions to wait for rescue in the water or escape by disguise.

Clothing is one of the most important safety equipment on board the aircraft, and it exists to provide additional protection and survivability, especially in the event of a forced landing of the aircraft into the water.