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Technical Evacuation System

Technical Evacuation System. TES - Reasoning When a rope is necessary or desired to ensure safety of the rescuer or patient All evacuation systems use an anchor system with a raising and/or lowering system

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Technical Evacuation System

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  1. Technical Evacuation System

  2. TES - Reasoning • When a rope is necessary or desired to ensure safety of the rescuer or patient • All evacuation systems use an anchor system with a raising and/or lowering system • Belay on separate anchor is used if main line failure would cause injury to rescuer or patient • Rescuer should never become a link in the system but should only control the system

  3. TES - Components • Lowering system 1. Braking devices 2. Rigging a litter for lowering 3. Lowering a person without a litter 4. Passing a knot 5. Loading patient while on a ledge or suspended

  4. TES - Components • Raising system 1. Mechanical advantage systems 2. Passing a knot 3. Raising a person without a litter

  5. TES - Components • Belay system 1. 540 device 2. Separate anchor system 3. Plan for shock load 4. Tandem prusiks 5. Load releasing hitch

  6. TES - Components • Highline 1. High strength anchors 2. Load assessment 3. Kootney highline 4. English reeve 5. Offsets

  7. TES - Components • Communications 1. Commands (down, raise, slow, stop, tension) 2. Anyone can say stop 3. Only IC can issue down or raise command

  8. TES - Components • Safety 1. Belay attached to litter, patient, and attendant 2. Rock or ice fall protection 3. Rope edge protection 4. Getting over the edge 5. Fixed line for working near the edge

  9. TES - Standards • Newton 1. Measure of force used to move a 1 kilogram (kg) object 1 meter (m) 2. One kilonewton (Kn) is 225 pounds (lb) of force

  10. TES - Standards • Rescue load 1. Two kilonewtons or 450 pounds 2. Accounts for patient, rescuer, personal and system gear weight

  11. TES - Standards • Safety factor 1. Ten to one (10:1) 2. Given a rescue load of 450 pounds and a safety factor of ten to one, all individual components of an evacuation system that might be required to hold a rescue load force should have a minimum breaking strength (MBS) of 20 kN or 4,500 lbs 3. To stay within the 10:1 safety margin, evacuation system forces should not exceed 2 kN or 450 lbs

  12. TES - Anchors • Main and belay are separate anchors • Use large, natural anchors if possible • Evaluate material where anchors are located • Evaluate for direction of pull and strength • Approach all anchors with skepticism • Monitor anchors throughout operation

  13. Anchors – Wrap Three Pull Two (W3P2) 1. 1” tubular webbing is 18 kN (4,000 lbs) per strand 2. Water knot is isolated, does not reduce strength 3. MBS about 70 kN (15,750 lbs) with angle < 30°

  14. Anchors – Distributed (Not Equalized) 1. ABC 8mm cord is 14 kN (3,150 lbs) per strand 2. Figure 8 cluster and double fisherman knots reduces strength by about 20% 3. MBS of abut 60 kN (13,500 lbs) with angle < 30°

  15. Lowering System – Main Line • Six bar brake rack and locking carabiner • Easy to add or remove friction under load • Does not twist rope • Use 11mm (7/16”) static rope • Tie off brake rack when stop is called • Do not use any hard rope grabbing devices

  16. Lowering System – Main Line 1. ABC 11mm polyester static rope is 40 kN (9,000 lbs) 2. SMC aluminum carabiner is 36 kN (8,100 lbs) 3. SMC brake rack is 44 kN (9,900 lbs) but can break rope at 26 kN (5,850 lbs)

  17. Lowering System – Main Line 1. Tie off brake rake with two wraps around bars and half hitch with overhand knot on rope

  18. Lowering System – Belay Line • 540 belay device with locking carabiner • Separate anchor system that is away from main line anchor system • Use different color 11mm (7/16”) static rope • If a 540 is not available, use a tandem prusik system attached to a load releasing hitch • Tie off 540 device when stop is called • Do not use any hard rope grabbing devices

  19. Lowering System – Belay Line 1. ABC 11mm polyester static rope is 40 kN (9,000 lbs) 2. 540 device is 36 kN (8,100 lbs) 3. SMC aluminum carabiner is 36 kN (8,100 lbs)

  20. Lowering System – Belay Line 1. Tie off 540 device with a half hitch with an overhand knot on the rope

  21. Lowering System – Tandem Prusik 1. ABC 8mm cord is 14 kN (3,150 lbs) per strand 2. Double fisherman knot reduces strength by 20% 3. Figure 8 knot reduces strength by 25% 4. SMC aluminum carabiner is 36 kN (8,100 lbs) 5. SMC single sheave pulley is 49 kN (11,025)

  22. Lowering System – Tandem Prusik 1. Radium load releasing hitch starts with a figure 8 on the load carabiner, follow with two wraps of the cord, add Munter hitch on anchor carabiner, tie off the hitch with a half hitch and an over hand knot

  23. Lowering System – Tandem Prusik 1. Use two different colored and length prusiks 2. Use prusik minding pulley if available 3. Tie off end of Radium load releasing hitch cord

  24. Raising System – Main Line • Use a 5:1 pulley system with two double sheave pulleys attached to the main anchor • Haul rope is usually dynamic climbing rope • Pull the haul rope away from the edge • Attach the load side of the pulley system to the main line using a quick release prusik • The brake rack is replaced with a dog and tails hitch on the main line • More mechanical advantage means less travel and more resets

  25. Raising System – Main Line 1. Water knot reduces strength by 40% to 50% 2. Dog and tails extender is 18 kN (4,000 lbs) 3. SMC double sheave pulley is 49 kN (11,025) 4. 8mm prusik loop is 22 kN (4,950 lbs)

  26. Raising System – Main Line 1. Quick release prusik will slip on main line at about 9 to 13 kN (2,025 to 2,925 lbs)

  27. Raising System – Belay Line 1. The raising system for the belay line does not change for either the 540 device or the tandem prusik setup

  28. Attaching To The Main And Belay Line 1. At the end of both the main and belay line, tie a high strength bowline and a 10 foot tail ending with a figure 8 knot

  29. Attaching To The Main And Belay Line 1. High strength bowline reduces strength by 20% 2. 11mm polyester static line is 40 kN (9,000 lbs) 3. At the bowline, static line is 32 kN (7,200 lbs)

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