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Committees on Safety to Life Committee on NFPA 664 M E M O R A N D U M TO: NFPA Technical Committee on Wood and Cellulosic Materials Processing FROM: Jeanne Moreau DATE: March 19, 2010 SUBJECT: NFPA 664 A11 ROP Letter Ballot The ROP letter ballot for NFPA 664 is attached. The ballot is for formally voting on whether or not you concur with the committee’s actions on the proposals. Reasons must accompany all negative and abstention ballots. Please do not vote negatively because of editorial errors. However, please bring such errors to my attention for action. Please complete and return your ballot as soon as possible but no later than Friday, April 9, 2010. As noted on the ballot form, please submit the ballot to Jeanne Moreau, e-mail to [email protected] or fax to 617-984-7110. The return of ballots is required by the Regulations Governing Committee Projects. Attachment: Proposals Report on Proposals – June 2011 NFPA 664 _______________________________________________________________________________________________ 664-1 Log #CP3 _______________________________________________________________________________________________ Technical Committee on Wood and Cellulosic Materials Processing, 1. Review entire document to: Update any extracted material by preparing separate proposals to do so. Update the following extracted definition found in NFPA 664 to read: A space completely enclosed by walls and a ceiling. Each wall in the compartment is permitted to have openings to an adjoining space if the openings have a minimum lintel depth of 8 in. (200 mm) from the ceiling and the total width of the openings in each wall does not exceed 8 ft (2.4 m). A single opening of 36 in. (900 mm) or less in width without a lintel is permitted when there are no other openings to adjoining spaces. [13, 2010] 2. Review and update references to other organizations documents, by preparing proposal(s) as required. Revise Chapter 2 Referenced Publications to read as follows: 2.3.1 ANSI Publications. American National Standards Institute, Inc., 25 West 43rd Street, 4th floor, New York, NY 10036. ANSI/ASME B31.1, Power Piping, 1998 2007. ANSI/ASME B31.3, Chemical Plant and Petroleum Refinery Piping, 1999 2008. 2.3.2 ASME Publications. American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016-5990. ASME Boiler and Pressure Vessel Code, 2001 2004. 2.3.3 ASTM Publications. ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959. ASTM E 1226, Standard Test Method for Explosibility of Dust Clouds, 2010 Standard Test Method for Pressure and Rate of Pressure Rise for Combustible Dusts, 2005. ASTM E 1515, Standard Test Method for Minimum Explosible Concentration of Combustible Dusts, 2003 2007. ASTM E 1591, Standard Guide for Obtaining Data for Deterministic Fire Models, 2006 2007. To conform to the NFPA Regulations Governing Committee Projects. The Committee changes are in compliance with the NFPA MOS. Printed on 3/18/2010 1 Report on Proposals – June 2011 NFPA 664 _______________________________________________________________________________________________ 664-2 Log #CP8 _______________________________________________________________________________________________ Technical Committee on Wood and Cellulosic Materials Processing, 1. Add the following new definitions to read: A deflagration hazard shall be determined to exist where either of the two following conditions are present: [654, 2011] Deflagrable wood dust is present as a layer on upward facing surfaces at a depth greater than that permitted in Section 4.7 Deflagrable wood dust is suspended in the air at a concentration in excess of 25% of the MEC under normal operating conditions. 2. Add the following new text as Section 4.7 to read: A deflagration hazard shall be determined to exist where the layer of accumulated fugitive dust on upward-facing surfaces exceeds 1/8th inch (3.2 mm) over 5% of the area or 2000 ft2 (185 m2), whichever is smaller. The layer thickness criterion in Section 4.7 shall be permitted to be corrected for dusts having a bulk density other than 20 lb/ft3 using the formula: INSERT BULK DENSITY FORMULA HERE where: Tp is the allowable thickness. Since there is no explicit criterion in NFPA 664 for what constitutes an explosion hazard even though there are numerous requirements that begin with the phrase “where an explosion hazard exists,” the user has had to use Section 6.4.2 to infer what constitutes an explosion hazard. The proposed text gives the facility owner/operator and the relevant enforcement authorities an explicit, clear definition of what constitutes a hazard. Printed on 3/18/2010 2 1 NFPA 664 LCP8 Rec A2011 ROP Report on Proposals – June 2011 NFPA 664 _______________________________________________________________________________________________ 664-3 Log #25 _______________________________________________________________________________________________ Peter Levitt, Sternvent Company, Inc. Revise text to read as follows: In (2), (3) & (4) replace “filter medium” with “filter media”. (3) The filter medium is not mechanically shaken or pressure pulsed. Filter media is the correct term & stated correctly in (1) & (2). The filters of enclosureless dust collectors are cleaned place the following ways; shaking by hand, a broom stick or dowel, a rake frame, a crank or compressed air from a hose and nozzle. These techniques are used to rejuvenate the filters and do not seem to increase the risk of fire or deflagration. Therefore, mechanical shaking should not be prohibited. Pressure pulse is used for enclosed dust collectors. The dust is on the outside of the filters and compressed air pulses are used to backwash the filters. I do not believe this technique is physically possible for open filters, where the dust is collected on the inside. Note: Supporting material is available for review at NFPA Headquarters. 1. The Committee accepts the change in terminology from "filter medium" to "filter media" in items (2) and (4). 2. Revise existing definition of 3.3.9.2* Enclosureless Dust Collector to read: An air–material separator designed and used to remove dust from the transport air possessing ALL of the following: (1) The filtration is accomplished by passing dust-laden air through filter media, collecting the dust on the inside of the filter media, and allowing cleaned air to exit to the surrounding area. (2) The filter media medium is not enclosed or in a container. (3) There is no means to mechanically shake or pressure-pulse the filter media while the fan is on. medium is not mechanically shaken or pressure-pulsed. (4) The filter media medium is under positive pressure. (5) Removal of the collected dust is not continuous or mechanical. The Committee accepted the submitter's proposed changes to items (2) and (4) and edited item (3) to clarify the features of an enclosureless dust collector. Printed on 3/18/2010 3 Report on Proposals – June 2011 NFPA 664 _______________________________________________________________________________________________ 664-4 Log #11 _______________________________________________________________________________________________ Pierre Morin, Pyradia-Belfab NFPA 664 in Chapter 3 on definitions in section 3.3.9.2 in item (3) where it states: The filter medium is not mechanically shaken or pressure pulse. And replace by: The filter media can be mechanically shaken, by hand, with a broomstick, by an electric motor, or pneumatic device. ● Over the last few years, there has been a growing requirement for some kind of shaking capability for “Enclosureless Dust collectors”. This feature offers multiple benefit, both at a level for safety and performance. ● Presently there many alternative manual devices to shaking filter bags in Enclosureless Dust collector, ranging from the common broom, stick, light steel fork, vertical or horizontal shaker manual shaker. ● These muscle driven mechanical solutions for shaking, if we take the literal sense could be taken as being in conflict with the definition presented in Section 3.3.9.2 (5) that state: “The filter medium is not mechanically shaken or pressure pulse.” ● There is a problem of clarity in this definition, in regards to the term that could be inferring to a human muscle using a broom or some other device to shake the filter medium or more than likely is inferring to a device that is driven by an electric motor or pneumatically or pressure pulse. ● Secondly this issue of clarity is further compound by the contradictory nature of the “The filter medium is not mechanically shaken or pressure pulse” relative to the operational requirement filter bags to shake at least once a day to maintain optimal filtration through the filter medium. The Committee did not want to encourage the use of means that would create a deflagrable dust cloud within the filter, especially when that means involves the action of an operator and would impact the safety of that operator. _______________________________________________________________________________________________ 664-5 Log #12 _______________________________________________________________________________________________ Pierre Morin, Pyradia-Belfab NFPA 664 in Chapter 3 on definitions in section 3.3.9.2 in item (3) where it states: The filter medium is not mechanically shaken or pressure pulse. And replace by: The filter media can be mechanically shaken, by hand, with a broomstick by an electric motor or pneumatic device. ● Over the last few years, there has been a growing requirement for some kind of shaking capability for “Enclosureless
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