Flame Swirls

Flame Swirls




RARE FANTASTIC 1525 Murano Orange Swirl Twist Flame Art Glass Vase Vintage
RARE FANTASTIC 1525 Murano Orange Swirl Twist Flame Art Glass Vase Vintage
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Ron Schuster 6 in Tall Flame Series Teal Swirl Dichroic Glass Paperweight FDS 3
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VINTAGE LIME GREEN PINK CLEAR ART GLASS SWIRL SCALLOP FLAME TIP VASE
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FENTON FLAME PINK CHIFFON LAMP LIGHT SWIRL GLASS FAGCA Vtg RARE Table Accent
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Vintage Isle Of Wight Glass Paperweight Pink Swirl with Flame Pontil Mark
Vintage Isle Of Wight Glass Paperweight Pink Swirl with Flame Pontil Mark
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Vintage Isle Of Wight Glass Paperweight Green Blu swirl with Flame Pontil Mark
Vintage Isle Of Wight Glass Paperweight Green Blu swirl with Flame Pontil Mark
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Fire swirls





Flame Swirls

what is the difference between medium velocity and high velocity spray systems in fire fighting?

also i would like to know the maximum velocity of flow in fire fighting pipes permitted by NFPA in a medium velocity spray system. please help.

1.Medium velocity systems – cooling fire down
Medium velocity sprayers discharge a water spray of finely divided droplets at medium velocity. They are ideal for protecting hazards involving light oils where emulsification from high velocity sprayers is not possible. The fine spray has a high heat absorption rate so medium velocity sprayers are an effective method of protecting adjacent plant and structures from heat during a fire by providing a continuous cooling spray over the exposed surfaces. Keeping nearby equipment cool minimises damage and reduces the risk of explosion.

Medium velocity water spray system is designed to control fires involving the lighter oils, liquefied petroleum gases and other flammable liquids with flash points below 650 C.

Cooling smothering and dilution play apart in varying degrees with such a system and a well known example of such a system is the PROTECTOSPRA SYSTEM. This type of system utilizes sprayers which produce a medium velocity water discharged with directional properties operating at a minimum water pressure of approximate 20 P.S.I. sprayers can be arranged for individual automatic operation or for automatic and manual operation in groups to command the plant or fire area concerned. Here again, the essence of the design is proper discharged pattern, careful hydraulic calculation and balance of flow and pressures. All systems are fitted with alarm equipment and monitoring devices as required.

Medium velocity water spray system has been developed and extensively installed for the following applications.

For fire risks involving the lighter oils, liquefied petroleum gases, and other inflammable liquids, where it may not be possible or desirable to extinguish the fire completely.
For the protection of vessels, plant, and structures exposed to heat from adjacent and surrounding fires.

2.High velocity systems – getting under the fire
High velocity systems are often used to protect equipment that incorporate heavy or medium oils;
equipment such as transformers, circuit breakers, diesel engines and fuel oil storage tanks, turbo
alternator lube oil systems and oil fired boilers. The high velocity nozzles are specifically designed
to discharge a jet of water at high speed. The water jet forms a cone of coarse spray of uniform
density which is discharged over a defined area. The coarse spray is able to penetrate the flame
zone and reach the surface of the burning oil. The turbulence created by the high velocity spray
forms an oil-in-water emulsion on the surface of the oil that will not burn. This “emulsification” is the
principal way the fire is extinguished, along with a cooling and smothering effect.

The shape of the spray cone, the fire area contacted and the water flow is all controlled by the nozzle specifications – the orifice size and the shape of the internal swirl plate – along with the water pressure and the orientation of the nozzle.

High Velocity Water Spray System are installed to extinguish fires involving liquids with flash points of 650 C (1500 F) or higher.

Some of the worst fires which have occurred in the history of fire fighting have been those involving oils and similar inflammable liquids. Unless promptly tackled at the source, such fires can rapidly grow to catastrophic proportions, often with irreparable damage to valuable plant.

Flame Swirls