Craig IMHO you are up for an explosion more than a fire: you have suspended fine fuel, air, confinement, all you need is a spark
Suggest vyou consider spark detection as in Firefly or Grecon for activation as you will noty have much time to dump water or drychem on it. Once spark is detected dump water, gas, drycvhem as you see. Do they have magnetic detectors/shutdown? Sorry in a jotel room in Bangkok this is the best FM has a DS on dust system just don't carry the CD with me anymore. Cheers Jack Sent via BlackBerry ----- Original Message ----- From: [EMAIL PROTECTED] Sent: 01/17/2008 05:35 AM To: <sprinklerforum@firesprinkler.org> Subject: Combustible ductwork, below slab ???? THIS MESSAGE ORIGINATED ON THE INTERNET - Please read the detailed disclaimer below. ***************************************************************************** We can get some odd ball stuff. This is a materials conveying system, conveying styrofoam dust particulate, the duct is HDPE and is buried 4-6 ft below the slab. The duct is 48" in Dia. There are 48" round manways with open grates on them every 100 ft or so. The total length of this duct system is over 500 ft. It picks up foam dust from equipment as well as from the floor. The challenge, protect this duct based on it's combustible nature and the nature of the materials being conveyed. Steel duct is not an option since the duct is direct buried. What's your approach? Craig L. Prahl, CET Fire Protection Group Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [EMAIL PROTECTED] http://www.lg.com _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) **************************************************************************** The following message has been automatically added by the mail gateway to comply with a Royal & SunAlliance IT Security requirement. As this email arrived via the Internet you should be cautious about its origin and content. Replies which contain sensitive information or legal/contractual obligations are particularly vulnerable. In these cases you should not reply unless you are authorised to do so, and adequate encryption is employed. If you have any questions, please speak to your local desktop support team or IT security contact. **************************************************************************** ************************************************** Royal & Sun Alliance - Notice of Confidentiality This transmission contains information that may be confidential and that may also be privileged. Unless you are the intended recipient of the message or authorised to receive it for the intended recipient) you may not copy, forward, or otherwise use it, or disclose it or its contents to anyone else. If you have received this transmission in error please notify us immediately and delete it from your system. ************************************************** _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
