Stokes Basket Operations With Aerial Ladders

Stokes Basket Operations UsingAerial DevicesMontgomery County Fire RescueDriver TrainingMarch 2014 2014

Table of ContentsPurpose of This Document .1Stokes Basket Aerial Operations Best Practices.1Types of Aerial Apparatus in Montgomery County .2Rope System Equipment .2Rope.3Carabiners.4Webbing .4Prusiks .5Anchor Straps .6Belays .8Single Sheave Prusik-Minding Pulley .10Rappel Rack.11Stokes Basket and Bridles .11Ladder Placement .13Ladder Angles .13Stokes Basket Evolutions Using Pierce All-Steer and E-One Towers.14Aerial Tower Stokes Basket Evolution Diagram.151- Identify Victim Location – Determine Best Apparatus Position .152 - Position Apparatus According to Plan – Set Up Aerial Device.163 - Assemble Equipment and Distribute Tasks.17A - Set Up Anchor and Change of Directions for Main and Belay Lines on the Basket .17B - Set Up Stokes Basket.18C – Identify Anchors for Main Line and Belay .20D – Move the Basket to the Target for Patient Lashing.21E – Build Dynamic Raising and Lowering System .22F – Build and Complete Belay.23G - Ensure System is Safe – “Three Sets of Eyes” Principle.25H – Load System and Balance Stokes Basket.255 - Operate System .26Example of Ropes In Alignment With Ladder .30Example of Ropes Out Of Alignment With Ladder .30Stokes Basket Evolutions Using Pierce Tractor Drawn Apparatus – Lyfe Pulley System .321- Identify Victim Location – Determine Best Apparatus Position.332 - Position Apparatus According to Plan – Set Up Aerial Device .333 - Assemble Equipment and Distribute Tasks.34A - Perform “Dry Run” of Aerial Ladder Placement.34B - Install Lyfe Pulley.34C - Place Main and Belay Lines .36D - “Dead-End” Main and Bely to Base of Aerial.37E - Tie Double Long Tail Bowline and Attach Stokes Basket .38F - Attach Tag Line.384 - Ensure System is Safe – “Three Sets of Eyes” Principle.395 - Operate System .39Stokes Basket Lashing Evolution .40Background.40Technical Information .40Equipment.41Procedure.42Interior Lashing .42Exterior Lashing .44

Purpose of This DocumentThe purpose of this document is to demonstrate acceptable best practices and technical methods forremoving patients from remote locations using stokes baskets attached to rope and aerial devicescommon to Montgomery County Fire Rescue.Stokes Basket Aerial Operations Best Practices Work within aerial ladder device manufacturer specifications and use good judgment.Deploy your system in a way that minimizes the potential for overstressing and/or shock loadingequipment.Movement of an aerial device for the purpose of raising, lowering, or rotating a stokes basketcarrying a patient should be avoided. The hydraulic advantage created by the movement of theaerial device causes dynamic loads that could cause failure of important components of a ropesystem.Keep rope and stokes basket in line with ladder at all times. Avoid rotating the aerial device suchthat the suspended portion of the rope becomes “out-of-line” with the ladder.Avoid attaching a patient attendant to a suspended stokes basket whenever possible.Always select bombproof anchors over marginal approaches.Employ “Three Sets of Eyes” to inspect any system before applying live loads.If an anchor is bombproof it can anchor the main and belay lines.Do NOT focus single point anchors (W3P2- wrap 3 pull 2).Single point anchors should be bombproof anchors.Multi-point anchors must be focused in the direction of the load (a carabiner or other smooth anddull object can be placed in overhand knot used to focus the anchor, thus allowing the knot to beuntied after it has been loaded. Do not attach anything to the carabiner placed in the overhandknot).All carabiners in anchors should be rated for general use.Carabiners should be oriented “down and down.” This means that when the system is loaded thecarabiner’s gate will screw shut in the direction that gravity would pull, and the carabiner shouldbe oriented so that the gate is facing down.MCFRS Driver Certification ProgramPage 1Stokes Basket Operations Using Aerial Ladders

Types of Aerial Apparatus in Montgomery CountyMCFRS Driver Certification ProgramPage 2Stokes Basket Operations Using Aerial Ladders

Rope System EquipmentThe following sections describe the equipment that is commonly used to assemble and execute an aerial stokesbasket evolutions in Montgomery County.This equipment includes: Rope, Carabiners, Webbing, Prusiks, Anchor Straps, Traverse 540 Belay and Triple Wrap Tandem Prusik Belay, Single Sheave Prusik-Minding-Pulleys, Rappel Racks, and Stokes Basket and Bridles.RopeUse ½ inch Static Kernmantle rope for both main and belay lines.Montgomery County Life Safety Rope is ½ inch static kernmantle and is usuallyavailable in 100, 200, and 300 foot lengths. The rope is inspected and storedcarefully in rope bags.Kernmantle RopeCharacteristics of ½ inch Static Kernmantle Rope Kern Inner Core Mantle Outer Sheath Static Low Stretch (Used for Rescue Systems) Breaking Strength 9000 lbs Safe Working Load 600 lbso Rescue systems require a 15:1 safety factor.o Safe for two-person load.How Much is a Human Load (Per NFPA)One Person Load 300 lbsTwo Person Load 600 lbsSafe Working LoadRope Carefully Storedin a Rope Bag9000 lbsBreaking StrengthSafety Factor (15) 15 600 lbsBraided nylon utility rope may be used as a tag line if an appropriate length oflife safety rope is not available.Utility rope is not suitable for supporting live loads and should not be used.Tag Line Attached to Stokes BasketBraided Utility RopeMCFRS Driver Certification ProgramPage 3Stokes Basket Operations Using Aerial Ladders

CarabinersCarabiners are metal connectors that link the several parts of a rope rescue systemtogether. Carabiners in Montgomery County may be made out or aluminum or steel andhave different rated strengths.Characteristics of Carabiners Have a self-closing, or spring-loaded gate that allows them to closeProperly LoadedautomaticallyCarabiner Gates should be oriented in the “downward” position and locked before use Designed to be loaded on the spine side onlyo The spine is the long axis of the carabiner, or the side opposite the gate openingo Loading carabiners on any side other than the spine can cause failure of the carabiner atsignificantly less than the rated strength May be constructed of either aluminum or steelo Device strength is typically stamped on the carabiner spine (represented in kN or Kilonewtons)o 1kN 224.8 lbso Rating and use classification may be identified using letters G-General, L-Light, or T-TechnicalNFPA 1983 2012 Edition identifies carabiners rated for 40 kN or greater as “General Use”. General Use carabinersare used for “System” loads. General Use carabiners may be constructed of either steel or aluminum. There arenow General Purpose Rated (G-Rated) aluminum carabiners strong enough to be used for “System” loads.“Technical Use” carabiners are rated for at least 27 kN and should be used for “Personal Use”. Look at the spine ofthe device to identify its rating. Personal rated carabiners in Montgomery County inventory will bear the letters“T”or “L” depending on when the device was manufactured. See the carabiner pictures below.General Use Rated Carabiners (System)Carabiner AMaterial - AluminumRating - 40 kN 8992 lbsABCarabiner BMaterial - SteelRating - 46 kN 10,340.8 lbsTechnical Use Rated Carabiners (Personal)Carabiner CMaterial – AluminumRating - 27 kN 6069.6 lbsCDMCFRS Driver Certification ProgramCarabiner DMaterial – AluminumRating - 27 kN 6069.6 lbsPage 4Stokes Basket Operations Using Aerial Ladders

WebbingWebbing comes in many varieties. The most commonly used webbing in Montgomery Countyis 1inch in width and is usually “tubular” in construction.Characteristics of Webbing Breaking strength of 4000 lbs Multiple uses such as:o Anchorso Harnesseso Patient Lashing Can be damaged by sharp objects or cornerso Use padding such as towels when wrapping webbing around abrasive orsharp objects When tying webbing into different configurations, the overhand family of knotsshould be used. This provides for the creation of a flat knot, which has greaterholding power in webbing, and will provide a knot that can be untied after loading. Overhand Bend“Fisherman’s Knot”Webbing can be most efficiently tied into fixed loops using an overhand bend, alsoknown as the “Fisherman’s Knot”/”Water Knot”Webbing is commonly used to make anchors using the “Wrap Three Pull Two” methodWebbing can be used to make fixed focused anchorsCarabiners may be inserted into overhand knots in webbing making it possible to un-tiea webbing knot after it has been subjected to weight or stress (“Crush Carabiners”)Wrap Three PullTwo AnchorWebbing Used to Make a Fixed and Focused AnchorMCFRS Driver Certification ProgramPage 5Stokes Basket Operations Using Aerial Ladders

PrusiksPrusik cords are fixed loops of accessory cord, tied together with a double overhand bend. Prusiks form usefuldevices that grip rope. Prusiks are wrapped twice around a host rope for personal applications, three times aroundthe rope for system uses.Characteristics of Prusiks Small diameter of kernmantle rope Found in diameters between 2 to 9 mmo Commonly found in 8 mm in Montgomery County Common uses include ascending, mechanical advantage systems, and belay systems8mm PrusikMCFRS Driver Certification ProgramPage 6Stokes Basket Operations Using Aerial Ladders

Anchor StrapsAnchor straps are nylon anchor devices that can have either sewn loops or metal attachments at each end.Characteristics of Anchor Straps May be assembled using straight, choker, or basket configurationso Each configuration has its own advantages and strength ratings Typically found in 1 ½ - 2 inch width and varying lengths Most straps will carry labels indicating their rated breaking strength in various configurationsMCFRS Driver Certification ProgramPage 7Stokes Basket Operations Using Aerial Ladders

BelaysA belay system is a safety, or back-up system used in rope rescue. It is designed to stop or catch a falling load(rescuer, patient, etc.) in the event of a main line failure.There are two very simple and reliable approaches to configuring belays commonly used in Montgomery County.There are other reliable belay mechanisms but these are simple to use and immediately available. These approachesinclude the use of: Traverse 540 Rescue Belay, and Tandem Triple-Wrapped Prusiks attached to a carabiner and belay line.Characteristics of Belay Systems Must be able to stop a load in motion or hold a load at rest Must survive an activation enough to allow further rescue Must minimize the shock load or Maximum Arrest Force (MAF) Must minimize the stopping distance of the load Must work in any environment Must activate automatically (must pass the whistle test) Must pass the critical point testTraverse 540 Rescue BelayMCFRS Driver Certification ProgramPage 8Stokes Basket Operations Using Aerial Ladders

Tandem Prusik BelayHow to assemble the tandem prusik belay Place two prusiks (one long one short) on the belay rope with three wraps Each prusik should be wrapped in the same direction around the ropeo Prusiks wrapped in the same direction are easier to visually inspect and physically manage Make sure the prusiks are snug on the rope (Dress the Prusiks)o A good test of this is to pull rope through the prusiks and listen for the friction between the ropeand the prusiks. If you can hear the friction, then the prusiks are tight enougho Also tug on the rope to make sure they grip Connect the prusiks to a carabiner attached to an anchorMCFRS Driver Certification ProgramPage 9Stokes Basket Operations Using Aerial Ladders