Ron, When you say "tube style", I am assuming that is the same as "pipe" conveyors where the belt is open at loading and unloading ends, but is "wrapped" closed by idlers for travel between conveyor ends and is flat for the return travel. Is that correct?
If the belt is fire resistive, it might not need water spray protection for the return belt depending upon the quantity of coal dust still adhering to the belt. I have recently done a 1000 ft. limestone conveyor of this type, where the client wanted both belts protected even though the belt was fire resistive and belt motors were interlocked to shut down the conveyor. - over kill in my opinion, since limestone is inert. For that situation, spray nozzles were provided over the top of the top conveyor and at the side to spray between belts and below the return belt. Regards, James L.(Jim) Roberts, PE/SET Fluor Corporation 100 Fluor Daniel Drive - C104F Greenville, SC 29607 864.281.5149 864.281.4916(Fax) "Rod DiBona" <[EMAIL PROTECTED]> Sent by: [EMAIL PROTECTED] 11/21/2008 06:33 PM Please respond to sprinklerforum To <[email protected]> cc Subject Coal conveying belts I am wondering what is typically done when covering an elevated (40' and higher) and enclosed tube style coal conveyor. The property in question is an FM property. The dilemma that I am trying to resolve is that when looking at FM data sheets 7-11 and 4-1N it only shows and talks about configurations to cover the top belt with no mention whatsoever of the return belt. NFPA #15 7.2.3.3.2 says "Discharge patterns of water spray nozzles shall envelop at a net rate of not less than .25 gpm/ft, the top and bottom belt surface area, conveyor surfaces where combustible materials are likely to accumulate, the structural parts, and the idler rolls supporting the belt." This seems to be a rare case where FM's requirement is less stringent than NFPA. In this case I am dealing with Powder River Basin coal which is more likely to spontaneously combust than coal from other areas so I would really feel better about doing both belts. At the end of the day FM will dictate the minimum but I wanted to be fully informed to give the owner all options. Thanks for your input as always. Rod DiBona Rapid Fire _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) ------------------------------------------------------------ The information transmitted is intended only for the person or entity to which it is addressed and may contain proprietary, business-confidential and/or privileged material. If you are not the intended recipient of this message you are hereby notified that any use, review, retransmission, dissemination, distribution, reproduction or any action taken in reliance upon this message is prohibited. If you received this in error, please contact the sender and delete the material from any computer. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of the company. ------------------------------------------------------------ _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
