Basic Knowledger about ship related, design, manufacturing, and how it works
Descrição: Basic Knowledger about ship related, design, manufacturing, and how it works
Basic Knowledger about ship related, design, manufacturing, and how it works
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Basic Knowledger about ship related, design, manufacturing, and how it worksFull description
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Tec 50 Knowledge Review
1. Your Your limits as a Tec Tec 50 diver diver are
2. In responding to an unresponsive unresponsive diver during a decompression dive dive at depth your priority is to get the victim to the surface. First wait until convulsions end, hold regulator regulator in and begin ascent after making victim neutrally buoyant and if necessary towing to find a suitable ascent/exit point. During ascent try to maintain a neutral airway ai rway to allow excess excess air to vent from victims victims lungs. Don't drop victims weights until until at the surface. If you owe little deco and have surface support probability of victim survival is high and risk to self is low. If you owe lots of deco and don’t have surface support probability of victim survival is low and risk to self is high. If you owe a deco stop you you must judge the risk of a DCS in bringing the victim out and missing it. 3. Long hose gas sharing sharing in the decompression phase phase of a technical dive dive may be necessary to close the gap between when a victim loses his gas supply and reaches another independent gas supply or the surface. Considerations and options include: - The depth at which the victim switches to the first deco gas. - whether the victim will need long hose gas sharing for air breaks - being ready to provide assistance at the surface after aft er completing decompression 4. Better me than thee philosophy: philosophy: you shouldn’t shouldn’t take unreasonable risks yourself yourself to help a victim because you can’t help someone if you’re in trouble yourself. 5. You You plan for ‘specific’ mistakes and emergencies emergencies by emphasizing good diving technique technique and adequate planning so that you should never face them - but you should still know what to do just in case. Skilled tec divers learn to look at each dive and plan for reasonably foreseeab foreseeable le mistakes and emergencies to that dive. 6. You You may want want to tec dive in a pool or shallow water - to refresh your skills - to extend your skills to specific situations - to invent mission specific skills 7. The most common mistake mistake in mission planning, and and the most common reason missions fail, is trying to accomplish more than is reasonable in a single dive. Missions must be simple and realistic. 8. - calculating a reasonable reasonable sample rate as 1m is too much much to cover cover methodology for collecting and labeling the various various samples and where where - Deciding upon a methodology they were found. - Determine who will lead and who will support including responsibility - Arrange for surface support - Arrange for practice to take place
Tec 50 Knowledge Review
- Practice in swimming pool first to be sure you can collect and bag the samples - Survey a sample of the dive site for exits and, dangerous objects etc - It would be impossible to do this in dive, in fact it would probably be more like a week! Tec 50 Knowledge Review Two 1. - Decompression Sickness (DCS) : is the condition in which inert gas (nitrogen) forms bubbles in the tissues and the bloodstream as it comes out of solution due to high supersaturation following a rapid ascent. - Arterial Gas Embolism (AGE) is the condition where air bubbles enter the bloodstream through a lung rupture, - Decompression Illness (DCI) is the field term for both AGE and DCI together. First aid and emergency management for both is identical so it’s NOT important to distinguish between the two. 2. Signs and symptoms of DCI are: - pain in the joints or mid-limb - undue fatigue - inability to urinate - blurred vision - itchy skin rash - tingling in the extremities - swelling - vertigo - hearing or speech impairment - paralysis - numbness - unconsciousness - bloody froth from mouth - loss of co-ordination - personality change - respiratory / cardiac arrest Symptoms can be immediate (usually when AGE related) or delayed (when DCS related). 3. Keep patient laying down, monitor ABCD’s, admin CPR if nec, administer emergency oxygen to a breathing patient via a demand system at 100%, alert EMS / DAN, maintain hydration 4. Field Neurological Examination - have patient follow finger with both eyes, they should track together. - Ask patient to use both hands to squeeze yours - weakness on one side suggests a problem - ask patient to close both eyes, stretch out the arms and then bend at the elbow to touch their nose with the fingertips. Inability to do this with either/both hands suggests a problem. - patient should be able to stand on one foot - snap fingers on either side of patients head. Ask if there’s any significant difference in loudness; If so, this could suggest nerve damage
Tec 50 Knowledge Review
5. Diver accident insurance benefits decompression by reducing delays associated with questions about payments. 6. Breathing pure oxygen helps oxygenate tissues suffering from restricted blood flow due to bubble formation. This helps protect these tissues until the patient receives decompression. On the other hand the oxygen window speeds dissolved nitrogen out of the body faster, minimizing and slowing further bubble growth to further reduce and worsening symptoms. The longer the oxygen window is open the better. 7. The steps you can take to broaden your abilities and limits within tec diving are: - Gaining Experience within current qualifications - Learn from those with experience - Push your comfort zone gently - respect the limits - continue training - Be patient 8. Patients 9. Trimix (TMx) is a blend of Oxygen, Helium and Nitrogen. 10. the advantages of trimix are - Reduced narcosis - Reduced gas density, as helium is lighter than O2 and N it’s easier to breath - Reduced O2 exposure, as Helium is non narcotic and has low gas density The disadvantages are: - More deco required - You cannot use an air or EANx schedule for TMx even if O2 content is the same. - TMx always requires accelerated deco with higher O2 content gasses. - You must plan separately for Helium 11. If Tec 50 instructor is a trimix instructor you may have option of using TMx on training dive 4. This does not certify you or qualify you to dive TMx independently.
- Total Gas A - Total Gas available with twin 21s with 150 bar = 6300 litres - This is not enough for the dive above - i.e. max gas used must not exceed 4200 litres - Therefore you would need to leave bottom after 21 mins so that total runtime is 82 mins and total gas used 4178 litres - With a 7 litre x 195 bar x O2 we are looking at a further 1365 litres and a total of 7665 litres. - If this O2 is used the original dive schedule could be used by switching to O2 during the 5m final stop. - Based on dive on 21% OTU’s = 38 & CNS = 14% after the dive. - Total OTUs for mission over 5 days = 2300 and Ave per day = 460 - Total used = 38 meaning 422 left over - So for the second dive = 460 x 4 = 1840+422 left over = 2262 / 4 = 565 OTUs can be used on the next dive. Note after 3 hours CNS falls to 12% OTUs 32
