Water mists

Diketene is a flammable Hquid with a flash point of 33°C and an autoignition temperature of 275°C. It decomposes rapidly above 98°C with slow decomposition occurring even at RT. The vapors are denser than air (relative density 2.9, air air = 1). The explosive limits in air are 2—11.7 vol % (135). In case of fire, water mist, light and stabilized foam, as well as powder of the potassium or ammonium sulfate-type should be used. Do not use basic extinguisher powders and do not add water to a closed container. 

Larger amounts of clay are being produced in diy powdered form [Anon., Ceramics Forum International, 67(7-8), 330-4 (1990)]. After grinding, the clay is agglomerated to a flowable powder with water mist in a balling drum. 

Figure 5.9 Wall of steel tank, originally V2 in. (1.3 cm) thick, that was entirely converted to oxide. It was continuedly exposed to oxygenated water mist at about 180°F (82°C).

NFPA 750 Standard on Water Mist Fire Protection Systems. National Fire Protection Association, Quincy, MA. 

In this case, a controlled quantity of water is discharged against a rapidly rotating disk where centrifugal force spins the droplets radially against circumferentially placed baffles, producing a fine water mist which is discharged into the airstream. 

Hie best overall efficiency of a turbine can be ensured by maintaining tile efficiency of the air compressor section. Conversely, allowing the air compressor efficiency to deteriorate will deteriorate the overall thermal efficiency of the turbine. Air compressor efficiency can be draslically reduced in a very short time when dirt, salt water mist, or similar air con-... 

Store OPA in a cool, well-ventilated area away from heat, open flame. Avoid contact with water mists or sprays, metals, alkaline materials, and some organics. Reacts readily with DF or DC, producing extremely toxic compounds (GB or a chlorine compound similar to GB). 

Stability Does not spontaneously decomposes but is reactive. Avoid contact with water mists or sprays, metals, alkaline materials, and some organics. 

In a fog-spray tank, plating chemicals clinging to parts are recovered by washing them with a fine water-mist. The solution that collects in the fog-spray tank is returned to the process tank as needed. The added water helps to offset evaporative losses from the process tanks. 

Forced air, water mist, or water spray cool the mold after it leaves the oven. Once the mold [. cools sufficiently for the polymer inside to solidify, it is opened. The cooling time must take. into account the resin, the wall thicknesses, and the metal from which the mold is fabricated, ff.. Very rapid cooling of the mold can introduce stresses that can weaken or distort the final part. 

Do not breath fumes skin contact with nerve agents should always be avoided contact with liquid sarin or vapors can kill responders. Hydrogen may be present Use water mist, fog, foam, or CO-2 to fight the fire do NOT splash or spread sarin. 

Extinguishing Media Water mist, fog, foam, C02. Avoid using extinguishing methods that will cause splashing or spreading of the VX. 

Measures to reduce the impact of fire include active and passive systems. Active systems include automatic sprinkler, water deluge, water mist, gaseous agent, dry chemical, foam, and standpipe handle systems. Passive protection is provided by fire resistive construction, including spray-applied or cementitious fireproofing of steel, concrete/masonry construction, and water-filled steel columns. Chapter 7 provides details on the design of fire protection systems. 

Water mist systems are intended for rapid suppression of fires using water discharged into completely enclosed limited volume spaces. Water mist systems are desirable for spaces where the amount of water that can be stored or that can be discharged is limited. In addition, their application and effectiveness for flammable liquid storage facilities and electrical equipment spaces continues to be investigated with optimistic results. Water mist systems are also used for gas turbine enclosure protection. 

A water mist system is a proprietary fire protection system using very fine water sprays. The very small water droplets allow the water mist to control or extinguish fires by cooling of the flame and fire plume, oxygen displacement by water vapor, and radiant heat attenuation. These systems are single shot systems. A water mist system and nozzles are shown in Figure 7-28. 

Properly designed water mist systems can be effective on both liquid fuel (Class B) and solid fuel (Class A) fires. Research indicates that fine (i.e., smaller than 400 microns) droplets are essential for extinguishing Class B fires, although... 

A significant challenge with using mist systems is determining whether the conditions of a particular manufacturer s limitation are representative of the actual conditions in which the system will be used. An engineering analysis should be performed to evaluate the significance of any variations between the actual fire hazard and the known performance capabilities of the water mist system. It is important that the test protocol contain these factors ... 

There has been a reluctance to provide water spray on compressors or turbines that typically tend to run "hot," with respect to the risk that a sudden deluge of cold water will result in severe thermal shock and cause cracking of the compressor case. However, studies indicate that this hypothesis is not valid (EPRI, 1985). These studies support the use of water spray protection where the fire hazard so warrants. Water mist systems are now being approved for gas turbines and compressors. 

NFPA 750—Standard on Water Mist Fire Protection System... 

NFPA 750—Standard on Water Mist Fire Protection System NFPA 2001 —Standard on Clean Agent Fire Extinguishing Systems... 

No there will not be vacuum, but lower pressure than at TDC. Still pretty high. I think Aubug already showed that the water mist that came through the carburettor would flash to steam before TDC due to compression alone. So you most probably have pressurised steam in the cylinder when it s firing. 

Yes it does. I think the compression is enough to turn the water mist into steam before it reaches TDC. Even if didn t, the spark or plasma would be hot enough to turn the water into steam. 

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