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Definition of Short duration and long-term coal storage in NFPA 850 ??

Question asked by Sanphet Pruksaritanon on Jul 24, 2016
Latest reply on Jul 25, 2016 by Steve Benton

Hello,

 

In 7.4.1.2 Fuel Handling - Coal of NFPA 850 established that

 

7.4.1.2 There are measures that can be taken to lessen the likelihood of coal pile fires. These measures are dependent on

the type and rank of coal. Among the more important are the following:

(1) Short duration, active, or “live” storage piles should be worked to prevent dead pockets of coal, a potential source

of spontaneous heating.

(3) Coal placed in long-term storage should be piled in layers, appropriately spread, and compacted prior to the addition

of subsequent layers to reduce air movement and to minimize water infiltration into the pile.

 

So, i have question. How many days to mean short duration and long-term storage?

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