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Immersion suits




 

2.5.1General requirements for immersion suits

3.1The immersion suit shall be constructed with waterproof materials such that:

3.1.1it can be unpacked and donned without assistance within 2 min, taking into account any associated clothing[‡] and a lifejacket if the immersion suit is to be worn in conjunction with a lifejacket;

3.1.2it will not sustain burning or continue melting after being totally enveloped in a fire for a period of 2 s;

3.1.3it will cover the whole body with the exception of the face; hands shall also be covered unless permanently attached gloves are provided;

3.1.4it is provided with arrangements to minimize or reduce free air in the legs of the suit; and

3.1.5following a jump from a height of not less than 4.5 m into the water there is no undue ingress of water into the suit.

3.2An immersion suit which also complies with the requirements of section 2.2 may be classified as a lifejacket.

3.3An immersion suit shall permit the person wearing it, and also wearing a lifejacket if the immersion suit is to be worn in conjunction with a lifejacket, to:

.1climb up and down a vertical ladder at least 5 m in length;

.2perform normal duties associated with abandonment;

.3jump from a height of not less than 4.5 m into the water without damaging or dislodging the immersion suit or being injured; and

.4swim a short distance through the water and hoard a survival craft.

3.4An immersion suit which has buoyancy and is designed to be worn without a lifejacket shall be fitted with a light complying with the requirements of paragraph 2.2.3 and the whistle prescribed by paragraph 2.2.1.8.

3.5If the immersion suit is to be worn in conjunction with a lifejacket, the lifejacket shall be worn over the immersion suit. A person wearing such an immersion suit shall be able to don a lifejacket without assistance.

 

2.5.2Thermal performance requirements for immersion suits

3.2.1An immersion suit made of material which has no inherent insulation shall be:

.1marked with instructions that it must be worn in conjunction with warm clothing; and

.2so constructed that, when worn in conjunction with warm clothing, and with a lifejacket if the immersion suit is to be worn with a lifejacket, the immersion suit continues to provide sufficient thermal protection, following one jump by the wearer into the water from a height of 4.5 m, to ensure that when it is worn for a period of 1 h in calm circulating water at a temperature of 5°C, the wearer's body core temperature does not fall more than 2°C.

3.2.2An immersion suit made of material with inherent insulation, when worn either on its own or with a lifejacket, if the immersion suit is to be worn in conjunction with a lifejacket, shall provide the wearer with sufficient thermal insulation, following one jump into the water from a height of 4.5 m, to ensure that the wearer's body core temperature does not fall more than 2°C after a period of 6 h immersion in calm circulating water at a temperature of between 0°C and 2°C.

 

2.5.3Buoyancy requirements

 

A person in fresh water wearing either an immersion suit or an immersion suit with a lifejacket, shall be able to turn from a face-down to a face-up position in not more than 5 s.

 

2.4Anti-exposure suits

 

3.3.1General requirements for anti-exposure suits

.1The anti-exposure suit shall be constructed with waterproof materials such that it:

.1provides inherent buoyancy of at least 70 N;

.2is made of material which reduces the risk of heat stress during rescue and evacuation operations;

.3covers the whole body with the exception of the head and hands and, where the Administration so permits, feet; gloves and a hood shall be provided in such a manner as to remain available for use with the anti-exposure suits;

.4can be unpacked and donned without assistance within 2 min;

.5does not sustain burning or continue melting after being totally enveloped in a fire for a period of 2 s;

.6is equipped with a pocket for a portable VHF telephone: and

.7has a lateral field of vision of at least 120°.

.2An anti-exposure suit which also complies with the requirements of section 2.2 may be classified as a lifejacket.

.3An anti-exposure suit shall permit the person wearing it to:

4 climb up and down a vertical ladder of at [east 5 m in length;

5 jump from a height of not less than 4.5 m into the water with feet first, without damaging or dislodging the suit, or being injured;

6 swim through the water at least 25 m and board a survival craft;

7 don a lifejacket without assistance; and

8 perform all duties associated with abandonment, assist others and operate a rescue boat.

.4An anti-exposure suit shall be fitted with a light complying with the requirements of paragraph 2.2.3 and the whistle prescribed by paragraph 2.2.1.8.

 

3.3.2Thermal performance requirement’s for anti-exposure suits

 

.1An anti-exposure suit shall:

.1if made of material which has no inherent insulation, be marked with instructions that it must be worn in conjunction with warm clothing; and

.2be so constructed, that when worn as marked, the suit continues to provide sufficient thermal protection following one jump into the water which totally submerges the wearer and shall ensure that when it is worn in calm circulating water at a temperature of 5'C, the wearer's body core temperature does not fall at a rate of more than 1.5'C per hour, after the first 0.5 h.

 

3.3.3Stability requirements

 

A person in fresh water wearing an anti-exposure suit complying with the requirements of this section shall be able to turn from a face-down to a face-up position in not more than 5 s and shall be stable face-up. The suit shall have no tendency to turn the wearer face-down in moderate sea conditions.

 


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