6 benign water benign conditions Sometimes also referred to as confined water. Often applied to the difference in pressure over the diaphragm of a demand valve required to open the valve to start flow. 44 downstream In the direction of flow. Bent D-ring A D-ring which has been bent about 45 near the straight section on both sides, forcing it to project slightly from the harness when pushed to one side, allowing easier attachment of clips. 91 whip sock also containment grip 92 Whip check device which contains a short section of the whip within a braided tube which reduces wear and point loading on the hose, and constrains motion of the hose. Neutral buoyancy See also: Buoyancy Having a fully immersed buoyancy exactly equal to weight, so that the forces are balanced and the person or object statically remains at a constant depth. 6 breakout The point at which an object being lifted which is partly embedded in the bottom sediments overcomes the adhesion of the sediments and the force required to lift it drops rapidly to the apparent weight of the object. Noaa Diving Manual, Diving for Science and Technology (4th.). Usually refers to cases where the flow is likely to entrain and pull the diver into an enclosed space.
Some blooms may be recognized by discoloration of the water resulting from the high density of pigmented cells. A big advantage of the air-to-liquid setup is the lower overall pipe and intercooler length, which offers faster response (lowers turbo lag) citation needed, giving peak boost faster than most front-mount intercooler setups. A b Boyd, Christopher; Levy, Amanda; McProud, Trevor; Huang, Lilly; Raneses, Eli; Olson, Carolyn; Wiegert, Eric. Sonic orifice Main article: Choked flow Metering device to provide constant mass flow of a gas. May also be used to search for the other end of a break in a cave line and repair the break jump reel jump spool A reel or spool with a relatively short line intended to be used as a jump line (q.v.). Positive displacement (of compressor) Compresses gas by reducing volume of compression chamber (cylinder) by mechanical means (piston) to produce higher pressure of the contents. A b c d e f g h i j k l m n o p q r s t u v w Bevan, John,. SPMs are the link between geostatic subsea manifold connections and weathervaning tankers. Freediving: Loss of consciousness caused by cerebral hypoxia on ascending from a deep breath-hold dive, when the swimmer does not necessarily experience an urgent need to breathe.
Speleogen Main article: Speleogen Dissolution features in butterfly valve thesis bedrock. The JCB Dieselmax land speed record-holding car is an example of such a system. US Navy Diving Manual, 6th revision. See also modified flutter kick fogging Main article: Anti-fog Condensation of water vapour on the inside surface of a mask or helmet faceplate, reducing visibility. Please selectAnguillaAntigua and Sint Eustatius and SabaBrazilBritish Virgin IslandsCanadaCayman IslandsChileColombiaCosta RepublicEcuadorEl SalvadorFalkland IslandsFrench RicoSaint BarthélemySaint Kitts and NevisSaint LuciaSaint MartinSaint Pierre and MiquelonSaint Vincent and the GrenadinesSint MaartenSurinameThe BahamasTrinidad and TobagoTurks and Caicos IslandsUnited StatesUruguayUS Virgin IslandsVenezuela. Contents, air Compressors edit, pressurevolume diagram of three compressions P1P2 in an open system. If diving and environmental conditions are significantly different from those previously experienced, they require an appropriate orientation with regard to local environmental conditions, and must have appropriate specialised training and experience to lead on dives which have more demanding operational parameters. Often on the surface at the dive control point, but ready to enter the water at very short notice on the instruction of the supervisor. The Toyota Celica GT-Four had this system from 1988 to 1989, 1994 to 1999, also in the Carlos Sainz Rally Championship Version from 1990 to 1993. May be attached to the back of the harness between the shoulder blades, or run continuous from one shoulder D-ring, around the back under the arms to the other shoulder D-ring. This wasteful practice (before intercoolers were used) nearly eliminated the gain in engine efficiency from forced induction, but was necessitated by the greater need to prevent at all costs the engine damage that pre-detonation engine knocking causes. 15 decompression algorithm Further information: Decompression practice Decompression algorithms Specified step-by step procedures used to calculate the decompression stops needed for a given dive profile. 29 Christo-lube Usually Christo-lube MCG111, an oxygen compatible lubricant suitable for use in breathing apparatus in oxygen service.
Bailout set bailout system Main article: Bailout cylinder An independent breathing gas supply carried by a diver for use in case of failure of the main gas supply. The state of neutral buoyancy is typically metastable for a compressible system. 3 The inter prefix in the device name originates from its use as a cooler in between compression cycles. A-frame Part of Launch and Recovery System Gantry or davit for launching and recovering bells, stages anchors or large ROVs. "Sustained-load cracking (SLC) in ruptured scuba cylinder made from 6351 aluminum alloy". Bottom gas The gas breathed by the diver at the deepest part of the dive.
It is usually possible to see natural light at the far end in good visibility and illumination. The body is and head are kept vertical and the mask and DV held against the face with one or both hands, elbows tucked. An organisation based in Cape Town, which publishes marine ecology field guides, dive travel guides and underwater maps. Gauge pressure Main article: Pressure measurement Absolute, gauge and differential pressures - zero reference Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure gauge snubber A needle valve or small. Some World Rally Championship cars use a reverse-induction system design whereby air is forced through ducts in the front bumper to a horizontally mounted intercooler. The top-mounted intercooler is circled in red. After a full inhalation, the diver fills the mouth with air, while the glottis remains closed, then opens the glottis and forces this air into the lung using the cheeks and tongue to reduce the mouth volume.
This gas is not directly connected to the surface. Lung packing see glossopharangeal insufflation mammalian diving reflex also diving response A reflex response to breathhold and chilling of the face diving response expressed by the cardiovascular system, which exhibits hypertension, bradycardia, oxygen conservation, arrhythmias, and contraction of the spleen. 14 :125 bailout block see also gas block, or gas switching block A gas switching block specifically intended for connection of a bailout set to the main gas supply (which may be scuba or surface supply) which allows. The definitions listed are in the context of underwater diving. Technically an overhead environment, but usually with no risk of getting lost, though entrapment may be possible. A line that is a base for measurement or for construction; see datum (calculations or comparisons). . Often used to bias the algorithm towards deeper stops. Helium analyzer Main article: Helium analyzer An instrument used to identify the presence and concentration of helium in a mixture of gases helmet diving see hard hat diving Henry's law Description of the relation between solubility. Rapid, often shallow breathing, associated with panic. London and Brussels: International Association of Oil Gas Producers.
Retrieved "Calculating SCR (Surface Consumption Rate. Used as exhaust valve in some twin-hose diving regulators dump valve Valve used to release excess air from a drysuit butterfly valve thesis or buoyancy compensator. Air-to-liquid intercoolers are usually heavier than their air-to-air counterparts due to additional components making up the system (water circulation pump, radiator, fluid, and plumbing). Pneumofathometer also pneumo Instrument to measure depth of a diver using a gauge calibrated in msw, fsw, or often both, to measure the ambient pressure at the diver by measuring the pressure in a hose filled with air with an open end at the diver. A decompression model and associated algorithms based on bubble dynamics. Latent hypoxia While freediving, an arterial pO2 which is sufficient to sustain consciousness at depth, but when ascending drops to hyoxic levels due to the reduction of ambient pressure, associated with ascent blackout. Primary regulator the regulator which the diver intends to breathe from for most of the dive. Compare with travel gas and decompression gas. Dehydration Main article: Dehydration A condition where the water content of the body is reduced.
The diver bends forward at the hips and waist and falls forward into the water, making a partial somersault and breaking the water with the cylinder, back and shoulders. It consists of a single surface attached to footpockets for both of the diver's feet. Military alternative term for CCR ceiling Solid overhead or decompression restriction to a safe direct vertical ascent to the surface cenote Main article: Cenote A sinkhole in Mexico. Scuba also scuba Main article: Scuba set Self-contained underwater breathing apparatus. "Southern Underwater Research Group Home Page". Exceptional exposure A dive in which the risk of decompresssion sickness, oxygen toxixity, and/or exposure to the elements is substantially greater than on a normal working dive. Short tug on a lifeline, used in pairs, for signalling purposes. Hang To remain stationary at a specific depth and location, particularly when decompressing.
( Lockout-tagout ) Safety procedure when working on a hazardous energy source. In some cases, such as cave lights, multiple redundancy may be desirable. The exhaust gases passing through the turbine section of the turbocharger are usually around 450 C (840 F but can be as high as 1000 C (1830 F) under extreme conditions. The depth at which the narcotic effects of nitrogen in a given Trimix mixture at a given depth are equivalent to the effects of air. Several patterns are in general use for underwater searches, depending on the target, the terrain, and available facilities. Hydreliox Main article: Hydreliox Deep diving breathing gas mixture of hydrogen, helium and oxygen. Bubble models Further information: Decompression theory Bubble models Decompression models based on the assumption that bubbles will form during non-symptomatic decompression. The chaser is hooked around the chain and pulled in the direction of the ancor until it slides onto the anchor shank and is stopped by the crown. 85 86 The surface interval necessary after diving to reduce tissue gas concentrations to a level where the risk of decompression sickness due to the pressure reduction experienced in normal commercial airliners is acceptable. The rules and constraints of scientific diving vary in different jurisdictions, but generally allow more options than mainstream commercial diving. Surface detection aids Equipment, such as flags, surface marker buoys, flares, epirbs, mirrors, and whistles, carried by divers to maintain contact with dive boats or attract rescue when lost at sea.
Reclaim system See also: Saturation diving System for recovering helium based breathing gas used by divers and recycling. The circuit can be simple or complex depending on the number of jumps involved. The extra power obtained from forced induction is due to the extra air available to burn more fuel in each cylinder. Quad A group of high pressure gas storage cylinders mounted upright on a frame and manifolded together. Capable of coexisting with elevated oxygen concentrations and a potential source of ignition without flashing, based on a systems maximum operating pressure and temperature. Marine intercoolers take the form of a tubular heat exchanger with the air passing through a series of tubes and cooling water circulating around the tubes within the unit's casing. Marsh Marine connector One of the popular underwater plug connector systems for diver communications cables.
Typical Applications: Spheroidal graphite cast iron is used to produce safety components for cable cars and ski lifts in high Alpine regions, for example, but also for heavy-duty chassis elements, crankshafts and wheel hubs of motor vehicles. Number stamped on the cylinder by the manufacturer in the shoulder area which identifies the cylinder. LP cylinder Low-pressure cylinder (US) with working pressure less than 2500 psi. Coded welder Welder who is trained and qualified and assessed as competent for a specified type of welding under specified conditions. Necklace Bungee loop attached to the secondary regulator second stage, worn around the neck to store the secondary close under the chin, where it is protected and the diver is immediately aware of a free-flow. Common in marine ecological research where in situ counting would be impractical. After reaching the surface, the last diver cuts the line and it sinks back down, Natural fibre is used so the line rots away over a few years. Bell cursor Mechanism or structure for guiding and constraining the motion of a bell when in the close vicinity of the deployment platform to improve handling in bad weather. Ingassing Further butterfly valve thesis information: Decompression theory Inert gas uptake (Ingassing) Inert gas uptake in body tissues during a dive or other hyperbaric exposure. In general, an intercooler or aftercooler is said to be a charge-air cooler.
J-valve Further information: Diving cylinder Types of cylinder valve Scuba cylinder valve with lever operated reserve mechanism. Vertical entry vertical drop entry An entry technique for relatively high drops, up to and sometimes exceeding. The bolt may rotate in the shackle under load without great risk of unscrewing the pin through-water communications Wireless voice communications transmitted through the water thumb the dive Terminate the dive by signalling exit to surface. Sump Main article: Sump (cave) A passage in a cave that is submerged under water. Held to the body by harness straps over the shoulders and round the waist. Retrieved taff (August 2016). Retrieved b Staff (April 2009). Usually a charge-air cooler means an air-to-air cooler where the heat is rejected using ambient air flowing through the heat exchanger, much like the engine's coolant radiator.
3 Christmas tree ladder A boarding ladder which has a single central rail with rigid cantilevered rungs to each side, allowing use while wearing swimfins. Traverse Pass through a cave by entering at one point and exiting at another. Monkey diving Further information: Side mount diving Terminology The use of sidemount configuration and procedures with a single cylinder. Archived from the original on 2 November 2013. Buoyancy control The skill of maintaining the appropriate buoyancy at any time during a dive. Trauma shears also bandage scissors or paramedic shears Main article: Trauma shears Blunt tipped slightly serrated shears with angled blades sometimes used by divers as a safety cutting implement in place of a knife or line cutter. Retrieved 14 September 2016. When intentional, generally after reducing buoyancy of BC and, if applicable, dry suit by venting to ensure that the diver will not float back to the surface, but will continue to descend. GPS Main article: Global Positioning System A satellite navigation system that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites gradient factor Further.
Subcutaneous emphysema Gas under the skin resulting from lung overpressure injury. While the multi-stage turbocharger systems are still in use in some tractor pull classes, selected high-performance diesels, and are also being used on newer late model commercial diesels, the term intercooler and aftercooler are used synonymously today. Welded assemblies or cable structures. Purge valve Valve in snorkel or mask which allows water to drain either under gravity or as a result of exhalation into the air space push gradient Tech diving jargon: Decompress at a high gradient factor, particularly when exceeding the baseline M-value. 5 controlled buoyant lift Main article: Controlled buoyant lift A rescue technique used by scuba divers to raise an incapacitated diver to the surface from depth. 1, currently (2012) used for manufacture of new diving cylinders. Retrieved Potkin, Ralph; Cheng, Victor; Siege, Robert (1 September 2007). 51 Further information: Oxygen toxicity Underwater A notional alarm clock, which accumulates hyperbaric oxygen exposure at a rate which increases with higher ppO2 toward the maximum single exposure limit recommended oxygen compatible Made from materials which are suitable for oxygen service. The line is used to keep the divers spaced evenly across the search area while swimming perpendicular to the line. Mix Short for trimix breathing gas mixed gas Breathing gas for diving other than air, but usually implies a helium based mixture. Gaseous impurities Contaminants in the compressed breathing air or gas mixture which are in gaseous form. When the pipeline is sufficiently long it is transported with the help of tugs to the installation area.
DIN fitting also DIN valve, DIN regulator, DIN thread Usually refers to G5/8" x 14 tpi 34 parallel thread fittings used to connect a cylinder valve to a filling connection or regulator first stage. 11 ascent Part of the dive profile where the diver is moving upwards towards the surface. Free-flow helmet A helmet where the breathing air supply is supplied at an approximately constant rate regardless of the diver's instantaneous breathing rate. Reclaim helmet See also: Saturation diving Diving helmet with a reclaim gas regulator allowing exhaled gas to be safely returned to the surface through an additional hose on the umbilical. Hook or BK safety hook A type of safety lifting hook which is held closed when under load by a lever system where the weight of the load holds the bill of the hook against the safety latch.
The diver fins upward while gently exhaling to keep expanding air in the lungs from causing lung expansion injuries. Used for keeping clothes and other equipment dry in a wet environment. The nut may be locked with a split pin for greater security. Transfer of a hand-off cylinder should not compromise either diver's buoyancy to the extent that they cannot make a normal, controlled ascent at neutral buoyancy. Retrieved 28 September 2017. Retrieved Pearn, John.; Franklin, Richard.; Peden, Amy.