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NFPA 750

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rewatson

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Nov 17, 2001
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I need to know about tools and equipment for high pressure piping in water mist systems.
 
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There are three main categories of sprinkler systems.

1. Low pressure system – conventional watersprinkler system.

Working-pressure below 10 bars. A certain type, called Mist Waterspray System, can be identified in this group.
This type of systems has at least 70-80 % water consumption compared to the conventional watersprinkler system.
2. Medium pressure system – mist waterspray system or watermist system.

The pressure range is from 10 up to 40 bars. The water consumption is at least
50-70 % of the conventional watersprinkler system.
3. Highpressure system – watermist or waterfog system.

The pressure range is working from 40 bars up to 100/150/200 bars.
The difference between mist and fog is the size of the droplets.
Fog has in average smaller droplets than mist.
A highpressure waterfog system has advantages over the low- and medium pressure systems
Total weight and the amount of water is reduced to a minimum.
Cooling effect is extreme high.
The grade of heat expansion.
Sizes of drain and scupper system is reduced to a minimum.
Dimension of pipes is small.


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Depending on the system, different pipe is used, high pressure single fluid systems (Hifog, Fogtec) generally use stainless steel with 10-40 mm ID's. Standard approved high pressure compression fittings are used (like Swage-lok)

SS pipe bending of smalled sizes by hand benders, larger sizes by hydraulic bender that doesn't collaspse tube (that mean mandrel bender not shoe and roller type)

Hope this helps.
Ken
 
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