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Mullion FAQ: Life jackets

The difference is the level of buoyancy or flotation provided – a 275 Newton having a higher level of buoyancy being nearly double that of 150 Newton.

A 150 Newton should only be used where light weight clothing is being worn and no heavy tools being carried. It is not recommended to the used with a flotation suit or a dry suit as it is possible that it will not self-right you in conjunction with this type of clothing.

A 275 Newton should be used where heavy weight clothing is being worn or tools are being carried, or when wearing a flotation suit of dry suit. All MULLION 275 N lifejackets are compatible with MULLION flotation suits.

Newton buoyancy basically relates to the amount of upward force or uplift provided by a lifejacket (or flotation suit / buoyancy aid) in the water.

1 Newton = approximately 1 tenth of a kilo (100 grams)

So a 50 Newton buoyancy aid will give 5 kilos of additional uplift in the water; a 150 Newton lifejacket will give 15 kilos of additional uplift; a 275 Newton lifejacket will give 37.5 kilo 27.5 kilos additional uplift.

Newton buoyancy basically relates to amount of force or uplift provided by a lifejacket (or flotation suit / buoyancy aid) in the water.

1 Newton = approximately 1 tenth of a kilo (100 grams)

So a 50 Newton buoyancy aid will give 5 kilos of additional uplift in the water; a 150 Newton lifejacket will give 15 kilos of additional uplift; a 275 Newton lifejacket will give 37.5 kilo 27.5 kilos additional uplift

This depends on the nature and frequency of use (if being used in a leisure environment on an occasional basis and providing it is well looked after and serviced regularly then it may well last for tens of years.

If being used in a heavy duty commercial environment on a regular basis then it may only last 1 – 2 years.

The life / replacement period on the operating parts is as follows:

SOLAS light: 5 years

CO2 gas cylinder: 5 years

United Moulders Firing Cartridge: 3 years

Halkey Roberts Cellulose Bobbin: 2 years

Hammar inflation mechanism: 5 years

NB. This is assuring there is no interim damage or corrosion to these parts within this period. If there is, then they should be replaced at this point.

It is strongly advised that it should be. Otherwise you fall into the water, the tendency will be for the lifejacket to come up over your head with the force of inflation and the impact of the water. Then your lifejacket will not be giving you the correct protection and / or supporting your head out of the water.

In an offshore environment it is very important as it covers the face and protects all your airways – i.e. ears, nose and mouth from water flushing into them from the wave motion.

It also provides comfort and a degree of thermal protection to the face by keeping it enclosed and covered.

Yes, MULLION supply all rearming parts required for all MULLION lifejackets and rearming instructions can also be supplied.

Ideally yes, as then the service centre can ensure the inflatable bladder / lifejacket can be refilled correctly after service.

Not necessarily. Generally speaking larger than average people have more inherent buoyancy in their own bodies and greater lung capacity than smaller people so the additional buoyancy required to support you in the water and self-right you is sometimes less than with a smaller person.

No, this harness is only designated for use with attachment to a safety line on deck and is not designed or approved for lifting purposes

The key protection factors of a lifejacket are that on water immersion it will: S

  • elf -right you if you fall in face-down and / or unconscious
  • Will support your head and upper torso above the water level to minimize the risk of drowning

For SOLAS life jackets they must serviced at an independent approved service centre approved by both the manufacturer and the National Administration. E.g. In the UK this would be the MCA (Maritime & Coastguard Agency). They must be serviced at intervals of 12 months maximum.

For CE life jackets there is no legal requirement for servicing but it is strongly recommended that they are also serviced by an independent approved service centre or an annual basis.

Less than 30 grams, which is very little. The common perception is that a 275 Newton lifejacket is a lot heavier and more cumbersome than a 150 Newton, but this is not the case.

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