QC YSI Life Jacket Inspection (2)

Other inspection requirements for marine inflatable life jackets

1. whistle

- The whistle equipped with the life jacket should be able to make a sound in the air immediately after being immersed in fresh water and taken out. The sound pressure level should reach 100dB(A).

- The whistle should be made of non-metallic material, with no burrs on the surface, and can make a sound without relying on any object to move.

- The whistle is fastened to the life jacket with a thin cable, and the placement should not affect the performance of the life jacket, and the wearer's hands should be able to use it.

- The strength of the thin cord should meet the requirements of 52 in GB/T322348-2015

2. Temperature cycling

After 10 cycles of high and low temperature, inspect the life jacket for appearance. The life jacket shall show no signs of damage, such as shrinkage, cracking, swelling, disintegration, or changes in mechanical properties.

3. Inflatable performance

- Immediately after each temperature cycle, automatic and manual inflation systems should be used to inflate, and life jackets should be fully inflated.

- After being stored in a high temperature environment of 40 °C and a low temperature of -15 °C for 8 hours, the life jackets should be fully inflated by the manual inflation system.

4. Buoyancy loss

After the life jacket is immersed in fresh water for 24 hours, its buoyancy loss should not exceed 5%.

5. Burn resistance

The life jacket is overfired for 2s. After leaving the flame, check the appearance of the life jacket. It should not continue to burn for more than 6s or continue to melt.

6. Strength

- Strength of the body and the lifting ring: The body and lifting ring of the life jacket should be able to withstand the force of 3200N for 30 minutes without damage, and the life jacket and the lifting ring should be able to withstand the action of 2400N for 30 minutes without damage to the ears.

-Shoulder strength: the shoulder of the life jacket should be able to withstand the force of 900N for 30min without damage, and the shoulder of the children's life jacket should be able to withstand the force of 700N for 30min without damage.

7. Dress

- Without instruction, 75% of the subjects should put on the life jackets correctly within 1min, and after instruction, 100% of the subjects should put on the life jackets correctly within 1min.

- Under provincial weather dress conditions, 100% of the subjects mentioned in 4.91 should put on the life jacket correctly within 1min

- The test shall be carried out using both inflated and non-inflated life jackets.

8. Water performance

- Restoration: After the subjects wear the life jacket, the average recovery time should not be greater than the average recovery time plus 1s when wearing the adult reference life jacket (RTD). If there is a "non-flip" situation, the number of "non-flip" should not exceed the number of times when the RTD is worn. RTD should meet the requirements in IMO MSC.1/Circ1470

-Static balance: When the subject wearing the selected lifejacket is in static balance facing up, the following requirements shall be met.

a) Clear height: The average clear height of all subjects should not be less than the average clear height when wearing RTD minus 10mmo b) Torso angle: The average trunk angle of all subjects should be no less than the average trunk angle when wearing RTD minus 10mmo go 10°

- Diving and falling into the water: The test personnel should meet the following requirements after falling into the water and diving in the standby state wearing a life jacket:

a) Keep the subject face up, and the clear height of all subjects out of the water is not less than the average clear height when wearing the RTD as determined by the test in accordance with 5103 minus 15mm: b) The life jacket does not come off and is not on the subject cause some damages:

c) Damage that does not affect performance in water or the buoyancy cell:

d) No falling off or damage to the life jacket light.

- Stability: After the subject is in the water, the life jacket should not sway from side to side so that the subject's face is out of the water. At least the same number of subjects in the same state as when wearing the RTD.

- Swimming and getting out of the water: After swimming for 25m, the number of subjects wearing life jackets who can climb on a life raft or a rigid platform 300mm above the water surface should be no less than 2/3 of the number of subjects without life jackets .

9. Inflatable head load

After the inflatable head is subjected to a force of (220±10)N from all directions, there should be no damage. The life jacket should not leak air and remain airtight for 30 minutes.

10. Under pressure

The life jacket under normal condition should have no swelling or change in mechanical properties after bearing a load of 75kg, and there should be no air leakage.

11. Pressure performance

-Over-pressure: The life jacket should be able to withstand excessive internal pressure at room temperature. It should remain intact and maintain this pressure for 30min.

-Release valve: If the life jacket is equipped with a release valve, it should be able to ensure that the excess pressure is released. The life jacket shall remain intact and maintain its pressure for 30 minutes, shall show no signs of damage such as rupture, swelling or change in mechanical properties, and shall not visibly damage the inflatable parts.

- Air retention: The air chamber of the life jacket is filled with air and placed at room temperature for 12 hours, and the pressure drop should not be greater than 10%.

12. Metal parts

- Metal parts and components on life jackets should be resistant to seawater corrosion. After the salt spray test in accordance with 5.151, the metal parts shall have no obvious corrosion or influence on other parts of the life jacket, and shall not degrade the performance of the life jacket.

- When the metal parts of the life jacket are placed at a distance of 500mm from the magnetic compass, the influence of the metal parts on the magnetic compass should not exceed 5°.

13. Prevent accidental inflation

The life jacket should have the function of preventing accidental inflation.

The above are the inspection standards for life jackets exported to the European Union, the United States, the relevant national standards for life jackets, and the material, appearance and on-site inspection requirements for the national marine inflatable inflatable life jackets.