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Copyright 2012 CFT DS/1 ISO 24801-2 / EN 14153-2 "AUTONOMOUS DIVER" Dry Suits.

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Presentation on theme: "Copyright 2012 CFT DS/1 ISO 24801-2 / EN 14153-2 "AUTONOMOUS DIVER" Dry Suits."— Presentation transcript:

1 Copyright 2012 CFT DS/1 ISO / EN "AUTONOMOUS DIVER" Dry Suits

2 Copyright 2012 CFT DS/2 We will cover Function and types Suit fit and undergarments Dressing Undressing Suit controls Care Use of B.C.s with drysuits

3 Copyright 2012 CFT DS/3 We will cover Buoyancy and drysuits Suit controls and weights Establishing neutral buoyancy Snorkelling in drysuits Drysuit squeeze After the dive

4 Copyright 2012 CFT DS/4 Function To keep water out To provide insulation Trapped air Small leakage not uncommon Through seals or controls

5 Copyright 2012 CFT DS/5 Types Light weight - Membrane High wear resistance No inherent buoyancy or insulation Dependant on adequate undergarments

6 Copyright 2012 CFT DS/6 Types Neoprene Same material as wetsuits Capable of stretching Loses buoyancy on descent

7 Copyright 2012 CFT DS/7 Suit Fit Should be closest possible fit Space to fit undergarments for insulation Built in booties on most suits Prone to squeeze Suit inflation maintains comfort

8 Copyright 2012 CFT DS/8 Undergarments Woolly bear Snug fit Thicker for membrane suits Many thin layers best Thermal underwear for neoprene Thick socks if booties fitted

9 Copyright 2012 CFT DS/9 Dressing Latex seals are easily damaged Seals must be fitted on bare skin Dust seals with french chalk or talc Apply beeswax to zip Sit down to fit legs, stand up and pull up to chest Insert hands carefully through seals Stretch neck seal as wide as possible and pull over head Get buddy to carefully close zip

10 Copyright 2012 CFT DS/10 Undressing Reverse process Wash down outside with fresh water Remove seals very carefully Hang suit up to dry Store by draping at the waist over a padded rail Dust latex seals with french chalk/talc to prevent perishing Spray booties with silicone

11 Copyright 2012 CFT DS/11 Suit controls To inflate and vent suit To add air for comfort factor Some suits, controls are extra Should be accessible when wearing B.C. Vent should be high on body Most vents are automatic Inflation by low pressure direct feed whip Should be accessible to either hand

12 Copyright 2012 CFT DS/12 Care Seals Vital and weakest part of suit On membrane suits, they can be DIY replaced Entry zips Water tight zip vital Position varies Clean and lubricate regularly

13 Copyright 2012 CFT DS/13 Use of B.C.s with drysuits CFT rule A B.C. to be used always With alternate air source, Preferably mini cylinder Why? Emergency rapid ascent Emergency buoyancy to escape from depth Recover from an inverted position Alternate air supply

14 Copyright 2012 CFT DS/14 Buoyancy and Drysuits Lightweight (membrane) suit has no inherent buoyancy Need little additional weight Less change in buoyancy during descent than neoprene Can become quite uncomfortable from squeeze Neoprene drysuits have greater inherent buoyancy Need additional weights Significant loss of buoyancy during descent Little squeeze experienced

15 Copyright 2012 CFT DS/15 Suit controls and Weights B.C. may obstruct access to fill valve Try combinations to get best match Correct weighting and neutral buoyancy just beneath the surface are important Excess weight leads to problems

16 Copyright 2012 CFT DS/16 Establishing Neutral Buoyancy Membrane suit with woolly bear Needs little additional weight In upright position submerge and vent suit fully No significant squeeze experienced Neutral buoyancy just below the surface

17 Copyright 2012 CFT DS/17 Establishing Neutral Buoyancy Neoprene suit Needs more weight In upright position, submerge and vent most air Some air required in suit to seal neck No squeeze experienced Neutral buoyancy just below the surface

18 Copyright 2012 CFT DS/18 Snorkelling in drysuits Membrane suits Particularly suitable If buoyancy adjustment is correct, squeeze is not a problem in normal snorkel dive range Neoprene suits Less suitable Excess buoyancy on surface Loss of buoyancy on descent

19 Copyright 2012 CFT DS/19 Diving Practice surface swimming in neutral buoyancy Training pool or safe open water - before diving Buoyancy while diving Maintain neutral buoyancy Too much air in suit affects trim Use B.C. to compensate for buoyancy loss Over inflation Air migration Risk of inversion

20 Copyright 2012 CFT DS/20 Drysuit Squeeze From 10m down squeeze may be painful To avoid discomfort add Comfort Factor of air Add minimal air to ease feeling of pressure Maintain comfort by adding/venting air throughout the dive

21 Copyright 2012 CFT DS/21 After the Dive Inflate the suit partially Reduces wind chill Rinse in fresh water Inside if necessary Hang up to dry

22 Copyright 2012 CFT DS/22 Summary Function and types Suit fit and undergarments Dressing Undressing Suit controls Care Use of B.C.s with drysuits

23 Copyright 2012 CFT DS/23 Summary Buoyancy and drysuits Suit controls and weights Establishing neutral buoyancy Snorkelling in drysuits Drysuit squeeze After the dive

24 Copyright 2012 CFT DS/24 ISO / EN "AUTONOMOUS DIVER" Questions?


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