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DC Terms&Definitions
| Term | Definition |
|---|---|
| ACTIVE DESMOKING | Removing smoke and heat from the smoke control zone between the inner smoke boundary and outer smoke boundary before extinguishing the fire, aiding fire-fighting efforts, and reducing smoke spread in the ship. |
| ACUTE EXPOSURE | Those in which doses are received in a short time, normally less than 24hours, as a result of exposure to initial radiation, base surge, or fallout, or combinations thereof. |
| ACUTE RADIATION DOSE | A dose of ionizing radiation that is received over a period of time that is too short for biological recovery to occur. |
| AFFF SINGLE-SPEED INJECTION PUMP | Permanently mounted, positive displacement, electrically driven, sliding-vane type of pump. |
| AFFF TANKS | The tanks are rectangular or cylindrical in shape and are fabricated out of 90/10 copper-nickel or corrosion-resistant steel. Each service tank is located inside the AFFF station and is fitted with a gooseneck vent, drain connection,fill connection, liqui |
| AFFF TRANSFER PUMPS | Permanently mounted,single-speed,centrifugal type, electrically driven pump. These pumps are provided in 360 gpm capacity. The transfer pump moves AFFF concentrate through the AFFF fill-and-transfer subsystem to all AFFF station service tanks on a selecti |
| AFFF TRANSFER SYSTEM | The transfer system can deliver AFFF concentrate to on-station service tanks via a transfer main. The transfer main consists of a large pipe with smaller branch connections interconnecting the AFFF service and storage tanks. |
| AFFF TWO-SPEED INJECTION PUMP | Designed to meet the demand for either a low or a high fire-fighting capability. The two-speed AFFF pump consists of a positive displacement pump rated at 175 psi, a motor, and a reducer, coupled together with flexible couplings and mounted on a steel bas |
| AFTER WELL DECK | Between the upper deck and the poop deck. |
| AIR BLAST | The shock wave that is produced in the air by an explosion. The shockwave initially travels outward at a velocity of approximately seven times the speed of sound at high overpressures. It will then gradually slow down to a sonic speed of about 1,000 fps a |
| AIRBURST | A burst where the point of detonation is below an altitude of 100,000 feet, and the fireball does not touch the surface of the earth. Air blast,thermal radiation (heat and light), electromagnetic pulse, and initial nuclear radiation (neutron and gamma ray |
| AQUEOUS FILM-FORMING FOAM | AFFF, also known as “light water,” is a synthetic, film-forming foam designed for use in shipboard fire-fighting systems. |
| AQUEOUS POTASSIUM CARBONATE (APC) | Are installed in Navy ships to provide protection for galley deep-fat and doughnut fryers and their exhaust systems. |
| ATHWARTSHIP | The athwartship structure consists of transverse frames and floors and is the crosswise portion of the ship. |
| ATOM | An atom is made up of tiny particles known as electrons, protons, and neutrons |
| AUTOGENOUS IGNITION TEMPERATURE | The temperature just adequate to cause the vapors from a petroleum product to burst into flames without the application of a spark or flame. |
| AUTO-IGNITION POINT | The minimum temperature required to initiate self-sustained combustion of a substance independent of external ignition sources of heat. |
| AUTO-IGNITION/SELF-IGNITION POINT | The lowest temperature to which a substance must be heated to give off vapors that will burn without the application of a spark or flame. |
| AUXILIARY CIRCUITS | An X in front of the circuit designator identifies auxiliary sound-powered circuits |
| BACKDRAFT | An explosion that results from combining fresh air with hot flammable fire gases when they have reached their auto-ignition temperatures. |
| BACKGROUND RADIATION | Low-level radiation from natural sources in the environment that is always present. The intensity varies in different regions of the world. |
| BACTERIA | Very small single-cell organisms, large enough to be visible through an ordinary microscope. |
| BALANCING VALVE | Automatically proportions the correct amount of AFFF concentrate with seawater. The balancing valve is a diaphragm-actuated control valve that responds to pressure changes between the AFFF concentrate supply line and the firemain. |
| BASE SURGE | Is from an underwater burst and is a rapidly expanding cloud or mist of water droplets. This cloud is produced by the collapse of the water column that was thrown up by the underwater detonation. |
| BETA PARTICLES | A form of ionizing nuclear radiation consisting of negatively charged subatomic particles emitted by some radioactive materials. A beta particle is a high-speed electron. |
| BIOLOGICAL VECTORS | These are animals in whose bodies the infecting organism develops or multiplies before it can infect the recipient animal. |
| BLACKOUT | Disruption of electronic emissions from radio and radar after a nuclear weapon explosion. It is caused by changes in atmospheric ionization. |
| BLISTER AGENTS | Chemical agents that affect the eyes and lungs and blister the skin, producing long-term incapacitation or death. Blister agents are odorless and vary in duration of effectiveness. The primary blister agents, HD and HN, are most effective for general use. |
| BLOOD AGENTS | Chemical agents that enter the body through the respiratory tract. Most blood agents act rapidly and are normally nonpersistent. In general, a victim who does not die quickly will recover within a few hours. |
| BLUEOUT | Acoustic reverberation (echoes) from underwater explosions (nuclear and conventional weapons) that masks the sounds sonar is supposed to detect. |
| BUFFER ZONE | The area between the inner and outer smoke boundaries established for a class BRAVO fire in a machinery space. |
| BULWARKS | Solid fencing along the gunwale of the main (weather) deck. |
| BUOYANCY | The ability of an object to float |
| CALCIUM HYPOCHLORITE | The standard shipboard decontaminant for chemical and biological agents. |
| CARBON DIOXIDE (CO2) | CO2 is a colorless and odorless gas. |
| CARBON MONOXIDE (CO) | A colorless, odorless, tasteless, and nonirritating gas. However, it can cause death even in small concentrations. |
| CASCOR (Casualty Correction) | This report shall be submitted as soon as possible after the casualty has been corrected. |
| CASREP (Casualty Report) | Casualty Report) is submitted to report the occurrence of a significant equipment casualty or malfunction which cannot be corrected within 48 hours and which reduces the ship’s ability to perform its mission. |
| CASUALTY EXPOSURE | The total gamma exposure that the commanding officer has established to identify radiological casualties |
| CENTER OF BUOYANCY | When a ship is floating at rest in calm water, it is acted upon by two sets of forces: (1) the downward force of gravity and (2) the upward force of buoyancy. The force of gravity is a resultant or composite force, including the weights |
| CENTER OF GRAVITY | The point at which all the weights of the unit or system are considered to be concentrated and have the same effect as that of all the component parts. |
| CHEMICAL AGENTS | Agents that produce harmful physiological reactions when applied to the body externally, inhaled, or swallowed. Most military chemical agents cause disorganization of the functioning of the body. |
| CIRCLE WILLIAM | The material classification of openings and ventilation systems between the interior of the ship and the outside atmosphere that are secured to minimize the penetration of nuclear fallout, chemical agents, or biological agents |
| CIRCLE XRAY | Fittings marked with a black X inside of a black circle. These modified closures are secured during conditions XRAY, YOKE, and ZEBRA. |
| CIRCLE YOKE | Fittings are marked with a black Y inside of a black circle. These modified fittings arensecured during conditions YOKE and ZEBRA. |
| CIRCLE ZEBRA | Fittings are marked with a red Z inside a red circle. These modified fittings are secured during condition ZEBRA. CIRCLE ZEBRA fittings may be opened with the commanding officer’s permission during prolonged periods of general quarters. |
| COLLECTIVE PROTECTION SYSTEM (CPS) | A system of air locks, high-pressure fans, and high efficiency filters providing pressurized, filtered air to total protection (TP) zones and filtered air to limited protection (LP) zones. |
| COMBUSTION | A rapid chemical reaction that releases energy in the form of light and noticeable heat. |
| OXIDATION | which is the chemical reaction by which oxygen combines chemically with the elements of the burning substance. |
| COMPARTMENT CHECK-OFF LIST | Provides an itemized listing of all classified fittings and closures used in damage control to set the specified material condition of readiness. |
| COMPLETE DECK | A deck that extends from side to side and stem to stern. |
| CONDUCTION | Transfer of heat through a body or from one body to another by direct physical contact |
| CONTAMINATION CONTROL AREA (CCA) | The CCA is used to control access to the ship of all personnel exposed to the weather during or after a chemical, biological, and radiological attack |
| CONVECTION | Transfer of heat through the motion of circulating gases or liquids. |
| CONVENTIONAL DECONTAMINATION (DECON) STATION | Conventional decontamination stations generally have saltwater nozzles in the shower stalls in addition to freshwater nozzles. Multiple decon stations and the availability of both salt and fresh water provide forworking around contaminated areas and battl |
| COSINE | The cosine is the ratio expressed by dividing the side adjacent to the angle by the hypotenuse. |
| SINE | In trigonometry, angles are represented by the Greek letter theta (). The sine of an angle , abbreviated as sin , is the ratio expressed when the side of a right triangle opposite the angle is divided by the hypotenuse |
| CPS DECONTAMINATION STATION | Four-compartment decon station with access to the weather deck in each TP zone |
| DAMAGE CONTROL BOOKS | Each book is pertinent to an individual ship. The information given covers the following six subjects: “Damage Control Systems,” “Ship’s Compartmentation,” “Ship’s Piping Systems,”“Ship’s Electrical Systems,” “Ship’s Ventilation Systems,” and “General Inf |
| DAMAGE CONTROL CLOSURE LOG pt 1 | The closure log is used to show where the existing material condition of readiness has been modified, the fitting’s type, number, and classification, the name, rate, and division of the person who requested permission to open or close the fitting |
| DAMAGE CONTROL CLOSURE LOG pt 2 | the date and time the fitting was opened or closed, the date and time the fittingwas returned to its specified material condition of readiness setting, the name and rate/rank of the person granting permission. |
| DAMAGE CONTROL ORGANIZATION | The damage control organization consists of two elements—the damage control administrative organization and the damage control battle organization. |
| DCTT TEAM LEADER | The executive officer serves as the chairman of the planning board for training and team leader of the DCTT.The team leader of the DCTT is responsible for the management of the training team. |
| DCTT TEAM COORDINATOR | The ship’s senior Damage Controlman or Hull Maintenance Technician normally hold the position of DCTT team coordinator. |
| DECAY (RADIOLOGICAL) | The decrease in the level of radioactivity from nuclear fallout as fission fragments decompose to a more stable state |
| DECONTAMINATION | The process of removing radiological ontaminants from a person, equipment, or structure. The process of making any person, equipment, or structure safe by absorbing, destroying, neutralizing, making harmless, or removing chemical or biological agents. |
| DEFICIENCY OF OXYGEN | An atmosphere where the oxygen content has been reduced below the point at which a person may work comfortably (approximately 19.5% by volume). |
| DELAYED FALLOUT | Fallout from a nuclear explosion that does not fall to the surface until 24 or more hours after the explosion. |
| DETECTOR TUBE | A glass tube that uses a sensitive chemical (in a suspension of silica gel) which produces color change whenever contaminated air is pulled through it. |
| DISPLACEMENT | The weight of the volume of water displaced by the hull. |
| DOG ZEBRA | Fittings marked with a red Z inside a black D. These modified fittings are secured during condition ZEBRA and darken ship conditions. |
| DT-60/PD | A gamma radiation dosimeter with a usable range of 10 to 600 R |
| EARLY FALLOUT | Fallout from a nuclear explosion that falls to the surface within the first 24 hours after the explosion. |
| ELECTROMAGNETIC PULSE (EMP) | An intense electromagnetic field that builds up to maximum strength within fractions of a second after a nuclear explosion. It can damage unprotected electrical and electronic equipment |
| ELECTRON | An extremely small particle of matter that orbits the nucleus of the atom. It has a negative electrical charge. |
| EMERGENCY OVERBOARD DISCHARGE CONNECTIONS | The emergency overboard discharge connections, port and starboard, are installed through the hull of each main transverse subdivision on the damage control deck |
| EMERGENCY WATER ACTIVATED REPAIR PATCH(EWARP) | 2x5 and 4x15 soak time 10 seconds Cure time 30mins |
| (EMP) | electromagnetic pulse |
| TREE DAMAGE | transient radiation electronic effects |
| Lower explosive limit (LEL) | the mixture of air and vapor is too lean for an explosion |
| Upper explosive limit (UEL) | the mixture of vapor and air is too rich to be explosive |
| FALLOUT | Radiological contamination formed in a nuclear surface burst consisting of radioactive particles and droplets that fall to the surface after the explosion, sometimes many miles away from the location of the etonation. |
| FIRE POINT | The temperature at which a fuel will continue to burn after it has been ignited |
| FIREMAIN SYSTEM | The firemain system is used primarily to supply the fireplug and the sprinkling systems; the other uses of the system are secondary. |
| FISSION | A nuclear reaction in which the nucleus of an atom of a heavy element splits into the nuclei of lighter elements, releasing a tremendous amount of energy. |
| FLASHOVER | A flashover is the transition from a growing fire to a fully developed fire in which all combustible items in the compartment are involved in fire. |
| FLASH POINT | The lowest temperature at which a flammable substance gives off vapors that will burn when a flame or spark is applied. |
| FORECASTLE (pronounced folk’sul) | This deck is above the main deck at the bow. The part of the main deck from the stem to just aft of the anchor windlass is the forecastle. |
| FORWARD WELL DECK | Forward part of the main deck between the upper deck and forecastle. |
| FREE SURFACE EFFECT | Free surface in a ship causes a reduction inGMbecause of a change in the center of gravity and a consequent reduction in stability |
| FREEBOARD | The distance from the waterline to the main deck. |
| FUNGI | Includes such plants as yeasts, molds, and mildews. These organisms are known for their ability to spoil foods and fabrics. |
| G SERIES NERVE AGENTS | Tabun (GA), Sarin(GB), Soman (GD) |
| GALLERY DECK | First deck or platform below the flight deck. |
| GROUND ZERO | The point of detonation of a nuclear surface burst on land. |
| GUNWALES(pronounced gunnels) | The upper edges of the sides where the sheer strakes join the main deck. |
| HALF DECK | Any partial deck between complete decks. |
| HEAT | Involves three methods-conduction, convection, and radiation |
| HEATCASUALTY | An individual unable to perform his or her duties as a result of heat exhaustion or heat stroke. |
| HEAT EXHAUSTION | A physical condition caused by exposure to high temperature combined with physical exertion, and marked by faintness, nausea,and profuse sweating; can be considerably reduced by proper physical conditioning and increased fluid intake. |
| HEAT STRESS | Heat stress is a pathological condition in which the body’s cooling mechanisms are unable to dissipate the heat load generated. |
| HEAT STROKE | A state of collapse or prostration, usually accompanied by high fever, brought on by exposure to heat; has a 50 percent mortality rate but accounts for only a small percentage of heat casualties. |
| HEPA FILTER | A high efficiency particulate air filter.HEPAfilters remove solid particles and liquid droplets from an air supply. |
| HIGH ALTITUDE BURST | A nuclear detonation that takes place at an altitude above 100,000 feet. |
| HORIZONTAL LOOP FIREMAIN SYSTEM | Consists of two-single fore-and-aft, cross-connected piping runs. The two individual lengths of piping are installed in the same horizontal plane (on the same deck) but are separated athwartships as far as practical |
| HOT WORK | Any operation that involves flame, spark, or temperatures in excess of 2050C (4000F). |
| HYCHECK VALVE | Diaphragm type, fail open,seawater pressure-operated control valve, which allows the flow of seawater from the firemain system to be mixed with AFFF concentrate. |
| HYTROL VALVE | Diaphragm type, fail open,seawater pressure-operated control valve that controls the flow of AFFF solution to systems. |
| IM-143/PD | The IM-143/PD indicates gamma radiation dose in the range of 0 to 600 R. |
| IMMEDIATELY DANGEROUS TO LIFE OR HEALTH (IDLH) | flammable vapors at a concentration of 10% or greater of the lower explosive limit (LEL); an oxygen content of less than 19.5% or greater than 22% |
| INCAPACITATING AGENTS | Used to wage and win a war without resorting to the massive killing, enormous destruction of property, and immense monetary cost. |
| INDIRECT FIRE ATTACK | Indirect fire attack is a method of attacking a fire in which fire fighters outside the fire area dischargewater fog into the fire area through a cracked open door or a bulkhead or overhead penetration. |
| INERT GAS | A gas mixture that is nonflammable, will not support combustion, and contains a maximum of 3% by volume of oxygen. |
| INERTING | A process in which an inert or nonflammable gas, such as carbon dioxide, helium, argon, or nitrogen, is introduced into an atmosphere to such a degree that the oxygen/flammable vapor content of the atmosphere will not burn or explode. |
| INITIAL NUCLEAR RADIATION | The radiation(essentially neutrons and gamma rays)that is emitted by the fireball and the cloud during the first min after detonation. All significant neutronradiation is emitted in less than 0.1 secondand gamma radiation up to 20/30 seconds. |
| KEEL | The keel is the backbone of the ship |
| KILOTON | Nuclear weapon yield equivalent to the explosive energy released by 1,000 tons of TNT |
| LIMITED PROTECTION (LP) ZONE | A zone within a collective protection system that provides protection against liquid and solid CBR agents but not agents in vapor form. |
| LONGITUDINAL FRAMES | Frames running parallel with the keel. |
| LONGITUDINAL STABILITY | The tendency of a ship to resist a change in trim. |
| LOOSE WATER | Used to describe liquid that has a free surface; it is NOT used to describe water or other liquid that completely fills a tank or compartment and thus has no free surface. |
| MECHANICALVECTORS | These are animals that transmit infective organisms from one host to another but, in themselves, are not essential to the life cycle of the parasite. |
| MEGATON | Nuclear weapon yield equivalent to the explosive energy released by 1,000,000 tons of TNT |
| METACENTER | The intersection of two successive lines of action of the force of buoyancy, as the ship heels through a very small angle. |
| METACENTRIC HEIGHT | The distance from the center of gravity to the metacenter. |
| MICROORGANISMS | Microbes, or minute, living organisms too small to be seen with the unaided eye |
| MISSION ORIENTED PROTECTIVE POSTURE (MOPP) | Mission oriented protective posture (MOPP) is the level ofCBRprotection directed by a ship’s commanding officer. Levels of protection range from 1 to 4, with 4 being fully protected. |
| MULTIGAS DETECTOR (DRAGER) | A single multi-purpose gas detector pump with calorimetric tubes used to detect over 100 toxic gases/vapors |
| MYCOTOXIN | A naturally occurring toxin produced by certain types of fungi that are potential biological warfare agents. Tricothecenes are an example. |
| NEUTRON | A subatomic particle that is electrically neutral. |
| NUCLEAR BURSTS | An explosion resulting from a fission or fusion reaction. |
| NUCLEAR RADIATION | The four types of nuclear radiation released as the result of a nuclear explosion are alpha particles, beta particles, gamma rays, and neutrons. |
| NUCLEUS | The central region of an atom, composed of protons and neutrons. |
| PATHOGENS | Living organisms that include bacteria, viruses, rickettsias, fungi, and protozoa |
| PERMISSIBLE EXPOSURE LIMIT (PEL) | PEL is based on a time-weighted average (TWA) for a normal 8-hour day, 40-hour, 7-day week. |
| PESTS | Pests are known as parasites when they obtain their food from living host cells. |
| PLATFORMS | Partial decks below the lowest complete deck used broken to admit machinery or other spaces and are called platform decks or just platforms. |
| POOP DECK | A partial deck above the main deck located all the way aft. |
| PORTABLE SUBMERSIBLE PUMPS | The portable submersible pump used aboard naval ships is a centrifugal pump driven by a water-jacketed constant speed ac electric motor and may be designed to operate as single or three phase at 120, 240, or 440 volts. |
| POWERCHECK VALVE | Diaphragm type, normally closed, seawater pressure-operated control valve. This valve allows the flow of AFFF from the pump to be mixed with seawater and protects the AFFF tank from seawater contamination or dilution. |
| POWERTROL VALVE | Diaphragm type, normally closed, seawater pressure-operated control valve.This valve allows the flow of AFFF/seawater solution through the distribution system or controls seawater flow on flight deck injection systems |
| PROTON | A subatomic particle that has a positive electrical charge. |
| PROTOZOA | Single-celled, animal-like forms that occur in a variety of shapes and often have complicated life cycles. |
| RADIATION | Transfer of heat from a source across an intervening space, no material substance is involved. |
| RADIAC | Radiation, Detection, Indication, and Computation. |
| RAPIDEXTERNALSURVEY | As in the rapid internal survey, the focus is on getting an accurate measurement quickly at action stations and expeditiously reporting the results. |
| RAPID INTERNAL SURVEY | Performed immediately after the cessation to get an indication of the severity of the radiation hazard at specific locations, primarily action stations. Safe stay times for interior vital stations can be calculated based on the rapid internal survey |
| RATE OF ACTION | The rate at which a body reacts to or is affected by that agent |
| RESERVE BUOYANCY | The volume of the watertight portion of the ship above the waterline. Expressed as a percentage, reserve buoyancy is the ratio of the volume of the above-water body to the volume of the underwater body. |
| RESIDUAL RADIATION | Nuclear radiation released after a nuclear explosion from fission products in fallout, rainout, base surge, and radioactive pool. |
| RICKETTSIAE | Intracellular, parasitic microorganisms that are intermediate in size between bacteria and viruses. |
| ROENTGEN (R) | A unit of exposure to gamma or X radiation. |
| SHIP INFORMATION BOOK | Eight volumes —Hull and Mechanical; Propulsion Plant; Auxiliary Machinery, Piping,Ventilation, Heating, and Air-ConditioningSystems; Power and Lighting Systems; ElectronicSystems; Interior Communications; WeaponsControl Systems; and Ballasting Systems. |
| SOFT PATCH | A patch used to repair small holes or cracks in low-pressure (150 psi) piping |
| STABILITY CURVES | When a series of values for GZ (the ship’s righting arm) at successive angles of heel are plotted on a graph, the result is a stability curve, also called the curve of static stability. |
| SUPERSTRUCTURE DECK | A partial deck above the main, upper, or forecastle deck that does not extend to the sides of the ship (if it does, it does not have the side plating carried up to it.). |
| SURFACEBURST | A nuclear detonation in which the fireball is in contact with the surface of land or water |
| TANGENT | The tangent of the angle is the ratio of the side opposite the angle to the side adjacent |
| TOTAL PROTECTION (TP)ZONE | Azone within a collective protection system that provides protection against liquid, solid, and gaseous CBR agents. |
| TOXINS | Poisonous products of living organisms that, when inhaled, swallowed, or injected into man or animals, will cause illness or death |
| TRANSIENT DOSE | A term used in some texts to describe the radiological dose received from the time of arrival of fallout or the base surge to the time of cessation of fallout. |
| TRIMMING MOMENT | A forward (or aft) movement of weight. |
| VECTORS | Disease vectors are animal carriers that transfer infective agents from one host to another. They usually are arthropods (insects, arachnids, and crustaceans) but may be other animals |
| VERTICAL OFFSET LOOP FIREMAIN SYSTEM Pt. 1 | Consists of two single piping runs, installed fore and aft in an oblique (that is, angled) plane, separated both vertically and athwartship, connected at the ends to form a loop. |
| VERTICAL OFFSET LOOP FIREMAIN SYSTEM Pt. 2 | The lower section of the firemain is located as low in the ship as practical on one side, and the upper section is located on the damage control deck on the opposite side of the ship. Athwartship cross-connects are usually provided at each pump riser |
| VOMITING AGENTS | These agents are dispersed as aerosols and produce their effects by inhalation. These agents produce minor eye irritation and a feeling of pain and sense of fullness in the nose and sinuses. |
| WEATHERING | The process by which radiological contamination is removed from the ship’s surface areas by the natural action of the environment, especially wind and rain. |
| WEIGHT | If you know the volume of an object and the density of the material, the weight of the object is found by multiplying the volume by the density. The formula for this is as follows: W = V x D (weight = volume times density). |
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