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24 Cards in this Set
- Front
- Back
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What are broad methods employed for wrecking-in-place operations?
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- manual cutting
- mechanical demolition - explosive sectioning - burying of settling wrecks |
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What is the most common method of performing small wrecking in place jobs and is used extensively on large wrecking operations?
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Manual cutting
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What method uses heavy lifting and hauling equipment mounted on floating cranes, salvage sheer legs, salvage vessels or improvised salvage barges?
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mechanical demolition
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Explosives are an important wrecking in place tool that can be effective in both ______ and ______ operations.
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Wreck removal and wreck despersal
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In peacetime, what is the least favored method of wreck disposal?
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Wreck Burial
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What takes priority for removal and disposal of ships contents?
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- Ordnance, weapons, explosives, and pyrotecnics takes first priority
- Organic material that forms noxious or dangerous decay products |
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At greater depths what is used for cutting other than acetylene?
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Hydrogen, due to the fact that it is less flamable.
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What kind of cutting tools are used?
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- Oxy fuel gas cutting torches
- Elec. or hydraulic cutting, grinding, or shearing - diver operated cutting equip. such as oxy arc, thermic lance, and kerie cable |
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What are the two u/w cutting processes that the navy employs?
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- oxy-arc cutting with exothermic electrodes, steel tubular electrodes, and exothermic
- Shielded metal-arc cutting (ordinary welding leads and rods) |
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What is the preferred method of u/w cutting?
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oxy-arc
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What are the 2 types of electrodes for oxy-arc cutting?
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1. Exothermic
2. Steel tubular *Exothermic is preferred |
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Sheilded metal arc cutting is particularly sutible for cutting what?
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1/4" steel or less and nonferrous metals or corrosion-resistant metal of any thickness
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Can surface flame cutting crews tap into the manifold divers are using for oxy-arc cutting?
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No
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What kind of O2 is required for for efficient oxy-arc cutting?
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Aviators breathing (high purity) O2
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What areas are particularly difficult to cut u/w becuase of extensive joiner work, furniture, bulkhead linings, piping, matress, etc?
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Messing, berthing, and machinery spaces
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Serious, sometimes fatal, accedents that occur during wrecking operations fall into what 4 categories?
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- Fire
- Explosion - Lifting - Personnel |
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Chain cutting requires high grade chain, such as _______ or near equivalent ______ stud link chain?
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Di- lok or flash butt welded stud link chain
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What size chain should be used for chain cutting?
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2 3/4" to 3 1/2" diameter
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Chain cutting should not be attemped with chain of less than ______ diameter?
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2 1/4" diameter
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What methods are included in mechanical demolition?
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- chain and wire cutting
- wreck grabs or heavy dredging grabs -impact cutting and smashing with wrecking chesils or wreck punches - direct ripping |
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Shape charges detonated against steel produces a cratering effect is known as _____ ______?
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Munroe Effect
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It is frequently necessary to combine _____-_____ and explosive cutting to gain the maximum benefits from the explosives?
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oxy-arc
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What are three common methods of wreck reduction?
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- Wreck burial
- Flattening wrecks - Cutting down wrecks |
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When may wreck burial be conducted?
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wartime military operation with heavy explosives
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