part i of dais report on comments was prepared by the ... · magnesium melt equipment, and are...

Report of the Committee on

Combustible Metals & Metal Dusts

Waldemar Seton, Chair SJO Consulting Engr, OR [SE]

Roy E. Adams, TIMET, NV [M] Rep. lnt'l Titanium Assn.,

Tom Christman, Lockheed Martin Energy Systems, TN [u]

R. Thomas Currin, Postin Products, Inc., NC [U] Joseph A. Domanieo, U.S. Dept. of the Army, MD [RT] John A. Gatchell, Wab Chang, Albany, OR [M] Rall?h W. Hawk, Cyprus Foote Mineral Co., NC [U] Kewn M. Laporte, Uni-Wash/Polaris, MI [M] ohn E. MeConaghle, Reade Mfg., Co., NJ [U] avid L. Oberholtzer, Valimet, Inc., CA |M] Rep. The Aluminum Assn.

John Valiulk~, Factory Mutual Research Corp., MA [I]

Alternates

W. Anthony Major, Silberline Mfg. Co., Inc., PA [M] (Alt. to D. L. Oberholtzer)

LarryJ. Moore, Factory Mutual Research, CO [I] (Alt. to J. valiulis)

Nonvoting

Thomas J. Matesie, Reactive Metals & Alloys Corp., PA Albert Muller, Lebanon, NJ

(Member Emeritus)

Shaft Liaison: Martha H. Curtis

This list represents the membership at the time the Committee was balloted on the text of this edition. Since that time, changes in the membershtp may have occurred. A key to classifications is found at the front of this book.

Committee Scope: This Committee shall have primary responsibility for documents on safeguards ag.ainst fire and explosion in the manufacturing, processing, handling, and storage of combustible metals, powders, and dusts.

This portion of dae Teclmical Committee Report of tile Committee on Combustible Metals and Metal Dusts is presented for adoption in 2 parts.

Part I of dais Report on Comments was prepared by the Technical Committee on Combustible Metals and Meted Dusts and documents its action on the comments received on its Rej)ort on Proposals on NFPA 480-1993, Standard for the Storage, Handling~ and Processing of Magnesium Solids and Powders, as published in die Report on Proposals for die 1998 Annual Meeting.

Pan I of tiffs Report on Comments has been submitted to letter ballot of tlae Technical Committee on Combustible Metals and Metal Dusts whlclt consists of 11 voting members. The results of tile balloting, after circulation of any negative votes, can be found in tiae report.

Part II of dais Report on Comments was prepared by dae Teehnlcal Committee on Combustible Metals and Metal Dusts and documents its action on flae comments received on its Report op Proposals on NFPA 651-1993, Standard the Manufacture of Aluminum Powder, as published in the Report on Proposals f0r the 1998 Annual Meeting.

Part II of tiffs Report on Gomments has been submitted to letter ballot of tiae Technical Committee on Combustible Metals and Metal Dust which consists of 11 voting members. The results of the balloting, ,after circulation of any negative votes, can be found in the report.

N F P A 4 8 0 1 A 9 8 R O C

PART I

(Log #4) 480- 1 - (3-1.2): Accept in Principle S U B M I T r E R : A! Boulet, Metal Works Ltd. COMMENT ON PROPOSAL NO: 480-3 RECOMMENDATION: Revise text to read as follows: All metal a d d e d to mel t ing pots shall be d loroughly dr ied by

prel leat ing total m i n i m u m of 250°F (121°C) for ~c t !c:= "2w-= ~q

SUBSTANTIATION: We are primarily, manufac tu re r s of m a g n e s i u m melt equ ipment , and are aware of die fact that m a g n e s i u m ingots mus t be pre-heated for safety r~asons. The m i n i m u m t e m p e r a t m e fllat die NFPA specifies is reasonable, be ing 250°F. However, die m i n i m u m length of t ime dlat is required for an ingot to mainta in tlmt t empera tu re (ddr ty minutes ) would undu ly penalize die die cast industries. This would canse some major capital expendi tu re in relocating and redes igning existing die c,'~st cells that would permi t such a massive t ranspor t hea t ing system to fit. By combin ing mel t rate r equ i rements ,and holding the ingot tempera ture , at 250°F for dtirty minutes , d ie size of the e q u i p m e n t would be massive ,arid impractical in most die casting plants.

in our many years of manufac tu r ing m a g n e s i u m preheaters , we have encoun t e r ed space restrictions. To ge t a round fills, we are bui ld ing more powerful ,and effective preheaters tllat allow die ingot to reach 250°F in a shor te r len~gth of time. By do ing hea t t ransmiss ion calculations on m a g n e s m m , it is proven dlat if d ie surface of the ingot i.~. at 250°F, die core of die ingot will reach that same tempera tu re in a mat te r of minutes .

Therefore , d ie NFPA s ta t emen t shou l d read: All metal added to m e l t i n g p o t s shall be thorough ly dr ied by p rehea t ing to a m i n i m u m of 250°F (121°C) .

Tempera tu r e moni to r ing of ingot in prehea t state: We drilled a hole in die cross section a n d in the center of die

ingot and half way down. T h e drilled hole was large e n o u g h to get a press fit widl a bayonet type thermal couple. Anod le r dlermal couple was a t t ached to die outside surface of the ingot widl the probe contact po in t di recdy on the ingot. We in t roduced die ingot into die hea t source. For dfis expe r imen t we t u rned die hea t on in die p rehea te r at d ie same t ime we in t roduced die ingot into its hea t zone dlerefore everything was cold. After 5 minutes die outside surface was at 239°F and die inside surface was 87°F. After 10 minu tes die outside surface was 312°F a n d d ie inside t empera tu re was 176°F. After 15 minu te s die outside surface was 3 9 9 ° F i n d die inside t empera tu re was 390°F. After 20 minutes tile outside surface was 500°F and tile inside t empera tu re was 487°F. W h e n die outside

o o surface reached 250 F die outside t empera tu re was at 97 F. When die inside t empera tu re reached 250°F die outs ide t empera tu re was at 331°F. T h e t empera tu re change h a p p e n e d widfin 3 minutes .

Note: The p rehea te r at start-up was also at ambien t t empera tu re which was 71°F. If die p rehea te r was at its opera t ing t empera tu re of 650°F when die ingot was in t roduced the cl imb in die t empera tu re would also be greater. COMMITTEE ACTION: Accept in Principle. 1. Revise tile p roposed wording of 3-1.2 in tile Report on Proposals to read:

3-1.2 All solid metal shall be d loroughly dr ied by prehea t ing and shall be at a t empera tu re not less allan 250 F (121 C) t h r o u g h o u t when coming into contact widl mol ten magnes ium.

2. Add new proposed wording to t i e Appendix as A-3-1.2 to read:

A-3-1.2 T h e contact of mois ture widl mol ten m a g n e s i u m metal can resuh in a violen~ explosive reaction widl die genera t ion of s team or hydrogen. It is impor tan t to establish a n d d o c n m e n t a m e d l o d of p rehea t in~ d la t heats all material to a m i n i m u m tempera tu re of 250°F (121 °C) to ensu re die removal of moisture. A h igher hea t ing t empera tu re migh t be necessary if tile metal is con tamina ted wida corrosion products , salts or odler foreign materials. Molds or tools dlat will come into contact widi mol ten m a g n e s i u m shou ld be similarly preheated . COMMITTEE STATEMENT: T he Commi t tee revised die wording to provide direct ion ~o exclude mois ture f rom mol ten m a g n e s i u m du r ing casting operat ions. T h e Commi t t ee removed die t ime limit to allow for various t echn iques to remove mois ture that would mee t the requ i rement . The Commi t t ee ,added Appendix material to clarify, d ie need to prevent contact of mois ture widl m o h e n maa~neneslum. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: H VOTE ON C O M M I T T E E ACTION:

AFFIRMATIVE: 9 ABSTENTION: 1 NOT RETURNED: 1 Doman ico

EXPLANATION OF ABSTENTION: CHR1STMAN: I respectfully submi t a vote of abs tent ion for die

balloting o f NFPA 480. Unfortunately, od ler c o m m i t m e n t s an d obligations have no t allowed t ime for me to review the d o cu m en t s being voted upon . l do no t believe tbat l can in good conscience vote on d o c u m e n t s tha t have no t been reviewed.

(Log #5) 480- 2 - (3-1.2): Accept in Principle SUBMITTER: S tephen C. Erickson, Dow Magnes ium COMMENT ON PROPOSAL NO: 480-3 RECOMMENDATION: Revise text to read as follows: 3-1.2 All metal added to mel t ing pots shall be dlorougif ly dr ied

b.yp.rel~eating to a m i n i m u m of 250°F (121°C) for ~c.t !~ : "d~.~ ~O

SUBSTANTIATION: Tile 30 minu te t ime r e q u i r e m e n t is too restrictive. S tandard commercia l preheaters in dae industry br ing ingot up to 250°F d w o u g h o u t in s lgnif icandy less t ime. COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: See Commi t t ee Action an d Commi t t ee S ta t emen t on c o m m e n t 480-1 (Log #4). NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:

AFFIRMATIVE: 9 ABSTENTION: 1 N O T RETURNED: 1 Domanico

EXPLANATION O F ABSTENTION: CHRISTMAN: See my Explanat ion of Abstent ion on C o m m e n t

480-1 (Log #4).

(Log #15) 480- 3 - (3-1.2): Accept in Principle SUBMITTER: Lorne Mclntyre, Meridian, Magnes ium Products Div. COMMENT ON PROPOSAL NO: 480-3 RECOMMEN DATION: All metal added to a mel t ing pot shall be d loroughly dr ied by prehea t ing to 250°F for no t less d lan (41 four minutes . SUBSTANTIATION: T h e p r o p o s e d 30 minu te s makes die size o f prehea te rs not practical a n d t i m e is no t needed . Also does no t conform to cu r r en t practice. COMMITTEE ACTION'. Acceptt in Principle. COMMITTEE STATEMENT: See Commi t t ee Action .and Commi t tee S ta tement on c o m m e n t 480-1 (Log #4). NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:


EXPLANATION OF ABSTENTION: CHRISTMAN: See my Explanat ion of Abstent ion on C o m m e n t

480-1 (Log #4).

(Log #6) 480- 4 - (3-1.4): Accept in Principle $UBMITTER: S tephen C. Erickson, Dow Magnes ium COMMENT ON PROPOSAL NO: 480-4 RECOMMENDATION: First sen tence should retain die phrase "settings" instead of die

p roposed change to " foundat ions a n d supports" . Add as sen tence two: "Crucible interiors a n d covers for die

cont, ' f inment of nrotective a t m o s n h e r e shall be ma in ta ined fr~¢ Of iron scale wh ich ' cou ld fall into the mo l t en metal." SUBSTANTIATION: The prob lem being addressed in die first part of 3-1.4 is die possibility of a thermi te reaction between hot won scale a n d mol ten magnes ium. Rust of d ie suppor t s of a fu rnace is no t normally a concern. The interior of the furnace normally known as die "setting" is a critic~'d a rea of concern. Widl tile advent o fSF 6 a n d odler protective a tmospheres die problem of iron scale fo rming above die mel t and react ing if it falls into tile mel t is a new concern.

N F P A 4 8 0 ~ A 9 8 R O C

COMMITTEE ACTION: Accept in Principle. 1. Revise ,and renumber the proposed wording of 3-1.4 in the Report on Proposals to read:

3-1.4 Prevention of Molten Magnesium Contact with Foreign Materials.

3-1.4.1 Areas of furnaces which can come into contact with molten magnesium in the event o fa runout shall be kept dry and free of iron scale.

3-1.4.9 Crucible interiors and covers shall be maintained free of iron scale witich could fall into the molten metal.

3-1.4.3 Molten magnesium systems shall overflow or relieve to second'try conh~nments designed to handle 110 percent of the largest expected failure ,and shall be provided with the means to prevent contact with incompatible materials.

3-1.4.4 Melting pots and crucibles shall be inspected regularly. Pots and crucibles that show evidence of possible failure or that allow molten metal to contact iron scale, concrete, or other incompatible materials sit,all be repaired or discarded.

2. Add Appendix Text as A-3-1.4 to read: A-3-1.4 Iron scale ,and molten magnesium can create a thermite

reaction. The interior of a crucible furnace normally known as the "setting" is a critical area of concern. With the use ofSF 6 and other protective atmospheres, the problem of iron scale forming above the melt and reacting if it falls into the melt is a concern. Since concrete always contains water, concrete in contact with hot materials such as molten magnesium can result in an extremely violent reaction, includingviolent spalling of concrete. COMMITTEE STATEMENT: The Committee revised the requirement to clarify the need to prevent contact of molten magnesium with foreign materi,als which can cause aggressive reactions, The Committee added a new second sentence to address the dangers associated with die use of protective atmospheres. The paragraph was reformatted to be consistent with the NFPA Manual of Style. The Committee ,added Appendix text to describe some potentLal hazards. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:

AFFIRMATIVE: 9 ABSTENTION: 1 NOT RETURNED: 1 Domanico

EXPLANATION OF ABSTENTION: CHRISTMAN: See my Explanation of Abstention on Comment

480-I (Log #4).

(Log #7) 480- 5 - (3-1.7): Accept in Principle SUBMITTER: Stephen C. Erlckson, Dow Magnesium COMMENT ON PROPOSAL NO: 480-6 RECOMMENDATION: The proposed claange totally misses the intent of the statement in the 1993 3-1.7. Do not change from the 1993 wording. SUBSTANTIATION: The proposed change has more to do with clothing required in areas where exposure to solid fires is possible. In the foundry we need to be concerned about exposure to molten metal and the possibility that it could act as an ignition source for clothing. COMMITTEE ACTION: Accept in Principle. Replace the proposed text of 3-1.7 in the Report on Proposals with the following text

3-1.7 Operators in melting and casting areas shall wear flame- resistant clodfing, high foundry shoes, and face protection. Clothing worn where molten magnesium is present shall have no exposed pockets or cuffs that could trap a n a retain magnesium. COMMITTEE STATEMENT: The Committee revised the text to

~ ovide provisions for increased protection to operating personnel. le Committee did not intend to remove existing language from

die previous edition of the Standard. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:

AFFIRMATIVE: 9 ABSTENTION: 1 NOT RETURNED: l Domanico


480-1 (Log #4).

480- 6- (3-2.1): Accept SUBMITTER= Stephen C. Erickson, Dow Magnesium COMMENT ON PROPOSAL NO: 480-7 RECOMMEN DATION:

Leave 3-9.1 in the standard as stated in dte 1993 version.

(Log #8)

SUBSTANTIATION: checking heat treating furnaces for uniformity is standard practice, Identification of hot spots is a fire safety issuel COMMITTEE ACTION: Accept. 1° Do not delete 3-9.1 as proposed in the Report on Proposals.

2. Reinsert and renumber the language from the 1993 edition of NFPA 480 to read:

3-9.1 A standard procedure for checking the uniformity of temperatures at various points within heat-treating furnaces shall be established. Furnaces shall be checked prior to use and at regular intervals during use to identify undesirable hot spots. COMMITTEE STATEMENT: The Committee believes that checking heat treating furnaces for uniformity is standard practice. The Committee agrees that identification of hot spots is a fire safety issue. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



480-1 (Log #4),

(Log #9) 480- 7 - (3-9.10 and #.-3-2.10): Accept in Principle SUBMrVrER: Stephen C. Erickson, Dow Magnesium COMMENT ON PROPOSAL NO: 480-9 RECOMMENDATION: Do not ,add proposal 3-9.10 and A 3-9.10.

SUBSTANTIATION: The concern being addressed in the proposed addition is unfounded. Without considerable qualification the proposed statement 3-2.10 is too restrictive. COMMITTEE ACTION: Accept in Principle. Revise the proposed wording of 3-9.10" and A-3-2.10 in the Report on Proposals to read:

3-9.10" Furnaces used to beat magnesium or magnesium alloys shall be inspected and cleaned as necessary to remove any accumulation of loose iron oxide scale.

A-3-2.10 There is a potential for a thermite reaction between magnesium, magnesium alloys and iron oxide at elevated temperatures. COMMITrEE STATEMENT: The Committee believes fllere is a potential hazard from a thermite reaction from the presence of accumulated loose iron oxide scale in heat-treating fiwnaces. The Committee revised the proposed language in the Report on Proposals to address the submitter's concerns. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: I 1 VOTE ON COMMITTEE ACTION:



480-1 (Log #4).

(Log #iS) 480- 8 - (4-1.6.1): Accept in Principle SUBMITTER: Lorne Mclntyre, Meridian, Magnesium Products Div. COMMENT ON PROPOSAL NO: 480-11 RECOMMENDATION: Revise text to read as follows: (Dry) Magnesium chips shall be removed...3 Ibs.

SUBSTANTIATION: Wet magnesium chips using the proper cutting fluid far exceed 3 Ibs under current practice. COMMITrEE ACTION: Accept in Prindple.

[ Revise the proposed text 4-1.6.1 in the Report on Proposals to read: ] 4-1.6.1 During magnesium machining operations, chips shall be ] removed from the point ofgeneration by continuous or batch I removal. Accumulation at tile point of generation shall not exceed [ 3 Ib (1.4 kg) dry weight All chips shall be stored in covered I noncombustible containers and removed to a storage area in [ accordance with Chapter 8.

COMMITTEE STATEMENT: The Committee has revised the requirement to address the fire hazard of excessive accnmulation of chips at the point of generation in machining operations. The Submitter did not provide sufficient technical substantiation to justify changing the 3 Ib (1.4 kg) accumulation limit to a larger number based on the type of cutting fluid. NUMBER OF COMMITrEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:

AFFIRMATIVE: 9 ABSTENTION: 1

N F P A 4 8 0 - - A 9 8 R O C

NOT RETURNED: 1 Domanico EXPLANATION OF ABSTENTION:

CHRISTMAN: See my Explanation of Abstention on Comment 480-1 (Log #4).

(Log #17) 480- 9 - (4-2.4.5): Reject SUBMITTER: Lorne Mclntyre, Meridian, Magnesium Products Div. COMMENT O N PROPOSAL NO: 480-12 RECOMMENDATION: Revise text to read a~ follows: Sludge level buUdup in die sludge tank on die wet type dust

collector shall not exceed .(-ra-)-(25) percent... SUBSTANTIATION: To match current practice and an unrealistic requirement. COMMITTEE ACTION: Reject. COMMITTEE STATeS'lENT: The Submitter did not provide sufficient technical substantiation to justify file recommended change. NUMBER OF COMMrVrEE MEMBERS ELIGIBLE T O VOTE: I 1 VOTE ON COMMITTEE ACTION:



480-1 (Log #4).

(Log #3) 480- 10- (Chapter 8) Hold SUBMITTER: Leo C. Beecher, Magnesium Corp. of America COMMENT O N PROPOSAL NO: 480-54 RECOMMENDATION: Revise text to read as follows: Chapter 8 Sgorage of Magnesium Solids 8-1" Storage of Pig~;, Ingots, and Billets 8-1.1 Aisle widths shallbe minimum of 10 ft (3m). The pile

height shall not exceed 20 ft (6.1 m). 8-1.2 Industrial buildings or separate storage areas in which

magnesium is being stored in quantities greater than 500 Ib (227 kg), or where magnesium is the primary hazard, should be labeled in accordance with NFPA 704, Standard System for the Identification of tile Fire Hazards of Materials. This serves as a warning to fire fighters of the potential risk in the event of an emergency.

8-1.3 Yard (Outdoor) Storage 8-1.3.1 Magnesium ingots shall be carefully piled on firm and

generMly level areas to prevent tilting or toppling. Storage areas and yard pavements shall be well drained. The storage area shall be kept free of grass, weeds and accumulations of combustible materials.

8-1.3.2 Readily combustible m~terial shall not be stored within a distance of 25 ft (7.6 m) from any pile of magnesium.

8-1 ..3 3 An open space, equal to the height of die piles plus 10 ft (3 m) shall be provtded between tile stored magnesium and adjoining property lines where combustible material or buildings are exposed or where file adjacent occupancy can provide fire exposure to file magnesium.

8-1.3.4 No cutting or burning shall be permitted without operating management anproval.

8-1.4 Indoor StoraRe ~" " 8-1.4.1 Combustible flooring shall not be used under piles of

ingots. 8-1.4.2 Storage should be on the first or ground floor. Basements

or depressions below tile magnesium storage area into which water or molten metal can flow should be avoided.

8-1.4.3 Autonlatic sprinkler systems are permitted only if the storage area is separ=~te from areas of molten metal handling and processing.

8-1.4.4 Magnesium storage should be segregated from combustible materials.

8-2 Storage of Heavy Castings. 8-2.1 Combustible flooring shall not be used under piles of

castings. 8-2.2 Storage should be on die first or ground floor. Basements

or depressions belo% tile magnesium storage area into which water or molten metal can flow should be avoided.

8-2.3 Aisle widths shall be a minimum of 10 ft (3 m). The pile height shall not exceed 20 ft (6.1 m). Aisles shall be maintained to permit inspection and effective nse of fire protection and fighting equipment.

8-2.4 All magnesium castings shall be clean and free of chips or fine particles of magnesium when being stored. 8-2.5 Automatic sprinkler systems are permitted only if the storage

area is separate from areas of molten metal handling and processing.

8-2.6 Industrial buildings or separate storage areas in which magnesium is being stored in quantities greater than 500 Ib (927 kg), or where magnesium is tile primary hazard, should be labeled in accordance with NFPA 704, Standard System for tile Identification of tile Fire Hazards of Materials. This serves as a warning to fire fighters of tile potential risk in ti~e event of an emergency.

8-3 Storage of Light Castings 8-3.1 Combustible flooring shall not be used under piles of

castings. 8-3.2 Storage should be on the first or ground floor. Basements

or depressions below tile magnesium storage area into which water or molten metal can flow should be avoided.

8-3.3 Aisle widths shall be a minimum of 10 ft (3 m). Tile pile height shall not exceed 20b ft (6.1 m). Aisles shall be maintained to permit inspection and effective use of fire protection and fighting equipment. Light castings shall be segregated from other combustible materials and kept away from flames or sources of heat capable of causing ignition.

8-3.4 All magnesium castings shaU be clean and free of chips or fine particles of magnesium when being stored.

8-3.5 Automatic sprinkler systems are permitted only if the storage .area is separate from areas of molten metal handling and processing.

8-3.6 Industrial buildings or separate storage areas in which magnesium is being stored in quantities greater than 500 lb (227 kg), or where magnesium is the primary hazard, should be labeled in accordance with NFPA 704, Standard System for the Identification of tile Fire Hazards of Materials. This serves as a warning to fire fighters of the potential risk in file event of an emergency.

84 Storage in Racks or Bins 8-4.1 Racks shall be permitted to be extended along walls in

optional lengths. Aisle spaces in front of racks shall be equal to the height of the racks. All aisle spaces shall be kept clear.

8-4.2 Combustible rubbish, spare crates, and sep/~rators shall not be permitted to accumulate within file rack space. Separators and metal sheets shall not be stacked on edge andleaned against racks as they will prevent heat from a small fire from activating automatic sprinklers and act as shields against sprinkler discharge.

8-5 Storage of Scrap Magnesium 8-5.1 This section shall apply to the storage of scrap magnesium

in file form of chips, turnings, swarf, or other fine particles. 8-5.2 Buildings shall be of noncombustible construction. 8-5.3 Dry magnesium scraps shall be kept well separated from

odler combustible materials. Scraps shall be kept in covered steel or other noncombustible containers and shall be kept in such manner or locations that they will not become wet. Outside storage of magnesium fines shaU be permitted if such storage is separated from buildings or personnel and great care is exercised to avoid file fines from becoming wet.

8-5.4* Wet magnesium scrap (chips, fines, swarf, or sludge) shall be kept under water in covered and vented steel containers in an outside location. Sources of ignition shall be kept away from the drum vent and top. Containers shall not be stacked.

8-5.5* Storage m quantities greater dlan 50 cuf t (1.4 cu m) (six 208 L drums) shall be kept separate from other occupancies by fire-resistive construction without window openings or by an open space of at least 50 ft (15 m). Such buildings shall be well ventilated to avoid tile accumulation of hydrogen in tile event that file scrap becomes wet.

8-5.6 ,~olid magnesium scrap, such as clippings and castings, shall be stored in noncombustible bins or containers pending salval~e.

8-5.'t7 Oily rags, packing materials, and similar combustibles shall not be permitted in storage bins or areas storing solid magnesium scrap.

8-5.8 Automatic sprinkler systems in scrap magnesium storage buildings or areas shall be prohibited.

8-5.9 Fire extinguishing agents and systems compatible for file hazards present shall be readily available in magnesium scrap storage areas.

8-6 Storage of Magnesium Powder 8-6.1 Buildings used to store magnesium powder shall be on

noncombustible single story constn~ction. 8-6.2 Automatic sprinkler systems in such buildings are strictly

prohibited. 8-6.3 Magnesium powder shall be kept well separated from other

combustible or reactive metals.

N F P A 4 8 0 ~ A 9 8 R O C

8-6.4 Magnesium powder shall be s tored in closed steel drums or Otiler closed noncombust ib le containers.

8-6.5 Magnesium powder storage areas shall be dry ,and checked for water leakage.

8-6.6 Fire extinguishing agents and systems compatible for dm hazards present shall be readily available.

8-6.7 Where magnesium powder in drums is stacked for storage, tile maximum height shall not exceed 18 ft (5.5 m). Stacked storage shall be done in such a manne r so as to ensnre stability. 13nder no circumstances shall containers be permit ted to topple over. No stacking is r ecommended .

8-7 Storage of Other Magnesium Products 8-7.1 This section shall apply to the storage of oilier magnesium

products in warehouses, wholesale facilities and retail outlets in whicil magnesium makes up tile major portion of die articles on a volumetric b~is .

8-7.2 Combnstible f looring shall not be used under piles of ingots.

8-7.3 Aisle widdls shall be a min imum of 8 ft (2 m). Storage height sitall not exceed 20 ft (6.1 m).

8-7.4 Automatic sprinkler systems ,are required where buildings are of combustible construction or the magnesium products are packed in combustible crates or cartons, or d lere is odler combustible storage within 30 ft (9 m) of the magnesium.

8-7.5 Industrial bui ld ings or separate storage areas in which magnesium is being stored in quantities greater allan 500 Ib (227 kg), or where magnesium is the primary hazard, should be labeled in accordance widl NFPA 704, Standard System for die Identification of rite Fire Hazards of Materials. This serves as a warning to fire fighters of the potential risk in file event of an emergency. SUBSTANTIATION: Insurance carriers and underwriters use NFPA 480 as a guide in qualifying warehouses for tile storage of magnesium. Lacking an unders tanding of tile metal and tile industry, tile s tandard should be written in such a way as to avoid confusion in tile storage of material.

Concerns include a definition of ",xisle". If an aisle is the area between a group or rows, limiting the size of a "pile" to a number of pounds is not practical or realistic. If an ,aisle is space a ro tmd a group of rows, or a round all four sides of a group o f rows, again it is not practical in as much as warehouses and consumers will use space in tile most efficient manner possible.

Witilout referring to NFPA's definition of noncombust ib le as tested per ASTM E13,6 and assuming that wooden pallets would fall in dlis definition, again it is not practical as producers and commercial warehouses may store and ship magnesium pigs, ingots, and billets on wooden pallets. This would occur with wrought products.

Commercial warehouses are commonly protec ted by sprinkler systems. Storage of pigs, ingots and billets in sprinkler protected warehouses should be allowed. COMMITTEE ACTION: Hold. COMMITTEE STATEMENT: The submitter 's p roposed revisions would change die Committee 's proposal to the point dlat dmy won[d have to restudy the text of tile Repor t on Proposals and other ,affected parts of tile docnmen t to fully evaluate tile impact of the proposed changes. The Colnmittee believes tllat many of the submitter 's concerns have been addressed by the actions on the comments . See Commit tee Action and Sta tement on Comments 480-11 (Log #10), 480-12 (Log#20), 480-14 (Log #12), 480-15 (Log #19), 480-16 (Log #13), 480-17 (Log #1), and 480-18 (Log #21). Tile Committee plans to study the submitter 's proposed recommendat ions for the next revision cycle. NUMBER OF COMMITrEE MEMBERS ELIGIBLE TO VOTE: ! 1 VOTE ON COMMITTEE ACTION:


EXPI.JdqATION OF ABSTENTION: CHRISTMAN: See my Explanation of Abstention on Comment

480-1 (Log #4).

(Log #10) 480- 11 - (8-1.2.3): Accept in Principle SUBMITTER: Stephen C. Erickson, Dow Magnesium COMMENT ON PROPOSAL NO: 480-30 RECOMMENDATION: I')o not change from tile pile size of 1,000,000 lb. in the 1993

version. SUBSTANTIATION: There is no justification to reduce pile size 10 fold given tile difficulty in igniting a solid piece of magnesium ~md if die o ther provisions of Section 8-1 are met.

COMMITTEE ACTION: Accept in Principle. Revise the proposed wording of 8-1.2.3, in die Report on Proposals to read:

8-1.2.3, The quantity of magnesium s tored in any pile shall be kept to a minimum. In no case shall the amount exceed 100,000 lb (45,400 kg).

Exception: Quantities s tored shall be permit ted to be increased up to a maximum of 1,000,000 Ib (454,000 kg) per pile when tile following requirements are met:

1.) Provision is made for drainage of water away from stored material.

2.) The aisle widtlls are equal to tile pile height plus 10 ft (3 m), but no less than 15 ft (4.5 m). 3) Piles shall not be more than 10 ft wide. COMMITTEE STATEMENT: The Commit tee agreed that a 1,000,000 lb (454,000 kg) pile can be safely stored provided that pile geometry allows for ready access to remove material in case of a fire. The drainage requ i rement was added to reduce tile ssibi,iw of water contacting moUen metal

BER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



480-1 (Log #4)°

(Log #20) 480- 12 - (8-1.2.3); Accept in Principle SUBMITTER: L o m e Mclntyre, Meridian, Magnesium Products Div. COMMENT ON PROPOSAL NO: 480-$0 RECOMMENDATION: In no case should file amount exceed ~..~,;~ nn n,~n . . . . . ~r.~, (1,000,000 lb)

SUBSTANTIATION: To match current practice andtusage requirements . COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: See Commit tee Action and Commit tee Statement on comment 480-11 (Log # 10). NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



480-1 (Log #4).

(Log #11) 480- 13 - (8-1.$.1): Reject SUBMITTEI~ Stephen C. Erickson, Dow Magnesium COMMENT ON PROPOSAL NO: 480-32 RECOMMENDATION: It does not make sense to delete this exception and then allow die

exception for 8-2.1 and 8-3.1. SUBSTANTIATION: None. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Tile Commit tee r e , ~ r m s its position as stated in file Repor t on Proposals. The Committee could not de te rmine if any equivalent protect ion is available for this purpose. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



480-1 (Log #4).

(Log #12) 480- 14 - (8-1.3,4): Accept in Principle SUBMITI'ER: S tephen G. Erickson, Dow Magnesium COMMENT ON PROPOSAL NO: 480-35 RECOMMENDATION: Do not change from file 1993 version where pile size is limited to

500,000 pounds.

~ T A 4 8 0 1 A 9 8 R O C

S U B S T A N T I A T I O N : If o ther condi t ions are me t in 8-1.3, piles of 500,000 p o u n d s are no t a fire hazard. A 10 fold reduct ion in ingot pcile size is no t warranted°

OMMITTEE ACTION: Accept in Principle. Revise the text in p roposed 8-1.3.4 in the Report on Proposals to read:

The quant i ty of m a g n e s i u m ingots s tored in any one pile shall be kept to a m i n i m u m , but in no case shall the ,amount exceed 50,000 Ib (23,000 kg).

Exception: Quant i t ies s tored shall be permi t ted to be increased up to a m a x i m u m of 500,000 Ib (226,800 kg) per pile when the following r equ i r emen t s are met:

1.) Piles shall no t be more than 10 ft (3 m) wide. 2.) T h e bui ld ing shall be spr inklered if combust ib le materials are

s tored without the benefi t of separat ion by fire wall or fire barrier wall f rom the m a g n e s i u m storage. (See NFPA 221, S tandard for Fire Walls a n d Fire Barrier Walls, for wall const ruct ion details.) COMMITTEE STATEMENT: T he Commi t t ee agreed that a 500,000 Ib (226,800 kg )p i l e can be safely s tored provided that pile geomet ry allows for ready access to remove material in ~ase of fire. The spr inkler or wall r equ i r emen t s were added to mitigate the ignit ion potential f rom t he s tored combustibles . NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON C O M M I T T E E ACTION:

AFFIRMATIVE: 9 ABSTENTION: l NOT RETURNED: 1 Domanico

EXPLANATION OF ABSTENTION: CHRISTMAN: See nay Explanat ion of Abstent ion on C o m m e n t

480-1 (Log #4).

(Log #19) 480- 15 - (8-1.3.4): Accept in Principle SUBMITTER: Lorne Mclntyre, Meridian, Magnes ium Products Div. COMMENT ON PROPOSAL NO: 480-35 RECOMMENDATION: Revise text to read as follows: The quant i ty of m a g n e s i u m ingots s tored in any one pile shall be

kept to a m i n i m u m . But in no case shall the a m o u n t exceed ( s e , o ~ !~) (500.00m S U B S T A N T I A T I O N : 50,000 is no t practical for a h igh vo lume

erat ion (1 t ruck load). Meet cu r ren t practices. MMITTEE ACTION: Accept in Principle.

COMMITTEE STATEMENT: See Commi t tee Action a n d Commi t tee S ta tement on c o m m e n t 480-14 (Log #12). NUMBER OF COMMrlq'EE MEMBERS ELIGIBLE TO VOTE: 1 i VOTE ON COMMITT E E ACTION:



480-1 (Log #4).

(Log #13) 480- 16 - (8-1.3.6): Accept in Principle SUBMITTER: Stephen C. Erickson, Dow Magnes ium COMMENT ON PROPOSAL NO: 480-36 RECOMMENDATION: Proposed s t a tement needs to be better def ined given the

r e q u i r e m e n t of a specific separa t ion dis tance r e c o m m e n d e d in 8- 1.2.5. S U B S T A N T I A T I O N : None. COMMITTEE ACTION: Accept in Principle. Revise the text of 8-1.3.6 in the Report on Proposals to read:

8-1.3.6 Combust ible material shall no t be s tored within a dis tance of 25 ft (7.6 m) f rom ,any pile of m a g n e s i u m pigs, ingots, and billets. COMMITTEE STATEMENT: T h e Commi t t ee revised this

al~Rh to be consis tent with the te rminology used in 8-1.2.5. OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: II

VOTE ON COMMITT E E ACTION: AFFIRMATIVE: 9 ABSTENTION: 1 NOT RETURNED: 1 Domanico


480-1 (Log #4).

(Log #1) 480. 17- (8-3.3): Accept SIJBMITTER: R . T . Leicht , C IGNA- Loss Control Services COMMENT ON PROPOSAL NO: 480-39 RECOMMENDATION:

Revise p roposed text as follows: Aisle m d t h s shall n, . t 5c !cm ~;:.'~ be a t least one-half the he igh t

of the piles bu t ".~..~.s ~.~.:~e =!:~! ~:~ !:~'g!:t .~.e !e~ a : ~ a n d shall be at least 10ft . S U B S T A N T I A T I O N : Al though "aisle" can be s ingular or plural, "width" is a single d imens ion . The re is only one width of a given aisle.

The wording of the proposal in its accepted form tells the user what the aisle width CAN'T be a n d what no case shall allow. This is inverted for lanl~ua~e of a Standard. A Standard shou ld be indicat ing what criteria shou ld be met; no t what it shou ld no t be less than.

T h e wording of the proposa l in its accepted form requires the he igh t of the piles to be at least 10 ft. I believe this is an error and that the in tent o f the commi t t ee was to require a m i n i m u m aisle width, no t a m i n i m u m p i l e height . The word ing of the proposal in its accepted fo rm w o u l d p r o h i b i t a user f rom having piles less than 10 ft. The re is no substant ia t ion as to why a user can ' t have piles less than 10 ft. COMMITTEE ACTION: Accept.

I Include the metr ic equivalent for 10 ft (3 m) in the submit ter ' s accepted r e c o m m e n d a t i o n . NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: I 1 VOTE ON COMMITTEE ACTION:

AFFIRMATIVE: 9 ABSTENTION: 1 N O T RETURNED: 1 Domanico


480-1 (Log #4).

(Log #21) 480- 18- (8-3.3): Accept in Principle SUBMITI 'ER: Robert E. Melton, Dallas Fire Dept. COMMENT ON PROPOSAL NO: 480-39 RECOMMENDATION:

I evise p roposed text as follows: Aisle widths shall r.c.: .~c Ic:~ ~ : :~ be at least one-hal f the he igh t

of the piles .5::t ".'~ .'~c c:~¢ :l-.~! :!== !-c'g!-t be !e~ d~c:~ ,and shall be at least 10ft . S U B S T A N T I A T I O N : This language seems to be backward for a s tandard. A s tandard shou ld explain what needs to be done, no t what shou ld not be done . The wording of the text in its accepted form advises the user what the aisle width CAN'T be ins tead of what it mus t be. Also, it appears tha t the word "height" was placed in the accepted text where the Commi t tee probably m e a n t to place the word "width". Otherwise, t he s t andard would prohib i t a user f rom having piles less than 10 ft. COMMITTEE ACTION: Accept in Principle COMMITTEE STATEMENT: See Commi t t ee Action a n d S ta tement on C o m m e n t 480-17 (Log #1). NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON C O M M I T T E E ACTION:



480-1 (Log #4).

(Log #CC1) 480- 19 - (8-7.1", A-8-7.1): Accept SUBMYITER: Technical Commi t t ee on Combust ib le Metals & Metal Dusts COMMENT ON PROPOSAL NO: 480-52 ~ C O M M E N DATION:

1. In 8-7.1 in the Report on Propos,als, revise the proposed wording to read:

8-7.1 This sect ion shall apply to tile storage of parts ,and componen t s , in warehouses , wholesale facilities, factories, ,and re ta i l es tabl ishments , in which m a g n e s i u m makes up 50 percen t or m o r e of tile article's composi t ion on a volumetr ic basis, or where file magnes ium-con ta in ing assemblies as packaged or s tored exhibi t the b u r n i n g characteristics of magnes ium.

2. Add proposed new Appendix text for A-8-7.1 to read:

N F P A 4 8 0 ~ A 9 8 R O C

A-8-7.1 Since the magnesium portions of parts and components can exhibit the burning characteristics of magnesium when involved in a fire, storage plans and arrangements should be designed to mitigate the fire hazards associated with burning magnesium.

Assemblies in which magnesium is a minority component might or might not exhibit burning behavior similar to a fire involving pure magnesium. This will depend on whefller or not the magnesium is exposed on the outside of the assembly, how fast or ho~k completely the packaging material might bum away to expose the magnesium, the height and arrangement of the storage array, the intensity of any exposure fire, and the rapidity with which automatic protection systems might respond to conu'ol the initial fire, thus preventing the involvement of the magnesium. The best method to determine the level of hazard is by a properly designed fire test. SUBSTANTIATION: The Committee is aware of the presence of magneslum-contalning ,articles in the marketplace particnlarly in storage areas that need additional protection, separation, and limitation on storage quantities. These articles can exhibit the burning characteristics of magnesium in fire situations. The Committee has provided appendix material to provide guidance regarding wilat factors should be considered in determining the ~dMMlicability of the s tandard.

ITTEE ACTION: Accept. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:

AFFIRMATIVE: 9 ABSTENTION: 1 NOT RETURNED: I Domanico

EXPLANATION OF ABSTENTION: CHR1STMAN: See my Explanation of Abstention on Comment

480-1 (Log #4).

(Log #16) 480- 21 - (Ao9-2.2): Accept in Principle in Part SUBMITTER: Lome Mclntyre, Meridian, Magnesium Products Div. COMMENT ON PROPOSAL NO: 480-54 RECOMMENDATION: Automatic sprinklerprotection should not be used in 5~:."!~::g~ ":=c~ fc.r 5!¢.'~:~g m:~.."~c!~=~g (areas of buildings where molten metal is nresentA SUBSTA~ITIATION: Match current practices and enhances fire protection of plantsl COMMITTEEACTION: Accept in Principle in Part. Revise the proposed wording of A-9.2.2 in the Report on Proposals to read:

A-9-2.9 Automatic sprinkler protection should not be used in areas of buildings where fine magnesium powders or dusts are present, such as blending operations. Automatic sprinkler protection should not be used in areas where molten metal can be

resent. OMMITTEE STATEMENT: The Committee agrees with the

submitter that areas handling molten metal should be explidtly addressed and also added the additional example of areas handling fine powders. Theproposed wording in the Report on Proposals was intended to address both molten metal and finepowders. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:


EXPLANATION OF ABSTENTION: CHRLSTMAN: See my Explanation of Abstention on Comment

480-1 (Log #4).

(Log #2) 480- 20 - (9-1.$): Accept in Principle SUBMITTER: Leo C.Beecber, Magnesium Corp. of America COMMENT ON PROPOSAL NO: 480-54 RECOMMENDATION: Revise text to read as follows: 9-1.3 All containers used to receive molten magnesium shall be

cleaned and dried and oreheated before use. SUBSTANTIATION: l;reheating of containers used to receive molten magnesium should be a standard safety practice. COMMITTEE ACTION: Accept in Principle. Revise the proposed wording o f 9-1.3 in the Report on Proposals to read:

9-1.3 All containers used to receive molten magnesium shall be clean and dry. Containers shall be oreheated to a minimum temperature of 250 ° F (121 °C) at the time of use. COMMITTEE STATEMENT: The Committee agrees with the submitter that preheating before use is an important fire safety practice and has added a temperature requirement to ensure that no free moisture is present in the containers. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



480-1 (Log #4).

(Log #14) 480- 22 - (A-9-3.1): Accept SUBMITI'ER: Stephen C. Erickson, Dow Magnesium COMMENT ON PROPOSAL NO: 480-54 RECOMMENDATION:

Add text to read as follows: (el sand: other high s i n 2 containing materials.

SUBSTANTIATION: Materials with high s i n 2 content are used by some as fire extinguishin~ agents. Under tl~e right conditions s i n 2 will react with magnesmm in a fairly violent way. COMMITTEE ACTION: Accept. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



480-1 (Log #4).

10

N F P A 6 5 1 - - A 9 8 R O C

P ~ T H

(Log #1) 651- 1 - (4-2.4): Accept in Principle SUBMITI~R: Peter Levitt, Sternvent Co., Inc. COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION: Add text to read as follows: The two preferred methods of aluminum dust collection are wet

dust collectors located indoors near the dust source or cyclone collectors located outdoors, as close to the dust source as possible, without filters. SUBSTANTIATION: The information is important and should be clear to the readers. COMMI'Iq'EE ACTION: Accept in Principle. In A-4 in the Report on Proposals, add the following proposed wording as appendix material to read:

A-4 There are two recognized methods of collecting aluminum dust in industrial operations. They are wet dust collectors which can be located indoor.,; near the point of dust generation, or dry- tyffcde collectors located outdoors, as close as possible to the point

don. STATEMENT: The Committee added explanatory

text to clarify the importance of placing the chosen dust collection method as close to the point of dust generation as possible. The Committee did not agree with the submitter that one method should be preferred under all conditions. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:


EXPLANATION OF ABSTENTION: CHRISTMAN: I respectfully submit a vote of abstention for the

balloting of NFPA 651. Unfortunately, other commitments and obligations have not allowed time for me to review the documents being voted upon. I do not believe that I can in good conscience vote on documents that have not been reviewed.

(Log #2)

651- 2 - (4-2.4, 4-2.4.1, 4-2.4.2): Hold SUBMIT]'ER: Peter Levitt, Sternvent Co., Inc. COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION: These paragraphs should be moved to the 4-5 Dry Type Dust Collector section and the paragraphs in that section should be renumbered. SUBSTANTIATION: All information about dry type dust collectors should be together. COMMITTEE ACTION: Hold. COMMITrEE STATEMENT: The submitter's recommendation would impact the Committee's proposal such that they would have to reexamine the text of the Report on Proposals and other affected parts of the document: to fully evaluate the impact of the proposed changes. This effort could not be conducted under the tlme constraints imposed for processing this report for the 1998 Annual Meeting. In addition, the comment contains new material that has not had public review. NUMBER OF COMMITTEE MEMBEIt~ ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

Exceptign 2: Large objects which can not be moved easilv, shoulql be finished within a walk in booth and dust collector combination located indoors. The air from the dust collector mav be recirculated.

Note: Supporting material available for review at NFPA headquarters. SUBSTANTIATION: Boeing and other aircraft companies are using such booths for aluminum dust. Most of the units are made by Torit. Has there been any history for fire loss? C O M M ~ ACTION: Reject. COMMITTEE STATEMENT: The submitter did not provide any technical substantiation to jnstify that such a dust collection design would provide an equivalent level of protection to what is currently required in the standard. The Committee believes that the use of this equipment in the collection of aluminum dust presents an unacceptable risk to exposed personnel and the surrounding area. The Committee was not provided with any technical substantiation to demonstrate that the equipment could provide clean air suitable for recirculation into the workplace. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITrEE ACTION:



651-1 (Log #1).

(Log #3) 651- 4 - (4-4.2 Exception): Accept in Principle in Part SUBMNWER: Peter Levitt, Sternvent Co., In~ COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION: Revise text to read as follows: Exception: ~?.~..crc =c:~ Frc:'c ~h=:When the collector's efficiency

is great enough to provide both personnel and property safety, with regard to particulate matter and hydrogen in the cleaned air, the cleaned air shall be permitted to be allowed to return to the work area. (See A-4-4.2). SUBSTANTIATION: The collection efficiency of a dust collector varies with the size of the dust partides and the dust loading. There is no test that can duplicate actual operating conditions and deem a dust collector safe. COMMITrEE ACTION: Accept in Principle in Part.

!Revise and renumber the exception proposed to 4-4.2 in the Report on Proposals to 4-4.1" to read:

Exception: The cleaned air shall be permitted to be returned to the work. area where tests conducted by an approved testing orgamzation prove the collector's efficiency is great enough to provide both personnel and property safety in the particular installation, with regard to particulate matter in the cleaned air and accumulations of particulate matter and hydrogen in the work area. (See 5-2.1). COMMITTEE STATEMENT: The Committee revised the wording of the exception to indicate that the required testing must take into account the actual operating conditions. The Committee added a provision to the exception that the testing be performed by an approved testing organization. The Committee relocated the exception to a more relevant paragraph. The Committee did not support the removal of the requirement for testing in the

~l~ tlon of this exception. RR OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11

VOTE ON COMMITIT.E ACTION: AFFIRMATIVE: 9 ABSTENTION: 1 NOT RETURNED: 1 Domanico


651-1 (Log #1).

(Log #5) 651- 3 - (4-2.5 Exception No. 2 (New)): Reiect SUBMITTRR: Peter Levitt, Stemvent Co., Inc. COMMENT ON PROPOSAL NO: 651-1 RECOMMF2qDATION: Revise text to read as follows: Exception 1: If the combustible aluminum dust collection system

is to be used for other materials, the system shall be disassembled and thoroughly cleaned of all incompatible materials prior to and after its use.

11

651- 5 - (4-4.8.3): Accept SUBMITrER: Technical Committee on Combustible Metals & Metal Dusts

COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION:

I In 4-4.8.3 in the Report on Proposals, delete the proposed paragraph and renumber the subsequent paragraphs. SUBSTANTIATION: Editorial correction.

N F P A 6 5 1 - - A 9 8 R O C

COMMITTEE ACTION: Accept. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

(Log #6) 651- 6- (4-5.2): Reject SUBMITTER: Peter Levitt, Sternvent Co., Inc. COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION: Revise text to read as follows:

Filter media Woe dust collectors should be avoided if nossible because of the 0otential of static electricity and the inability to thorouffhlv clean the filters on a daily basis. If filter media must be used. because of excessive emissions from a cyclone collector, then it must be of the conductive tYPe. (See A-4-2.4.1l.

. _

SUBSTANTIATION: Use of filter media should be discouraged here as well as in the appendix. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Committee believes that the prohibition of filter media collectors is not justified. The preference for cyclone collectors over media collectors is addressed in A-4-2.4.1. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

(Log #7) 651- 7 - (4-5.6): Accept in Principle SUBMI'I~rER: Peter Levitt, Sternvent Co., Inc. COMMENT ON PROPOSAL NO: RECOMMENDATION: Revise text to read as follows: x,*,.~.crc 2.~ cxp!cz'c=: .~a::.:~ cx'z'.=, dry dust collectors shall be

provided with deflagration vents. Extreme care shall be taken in the selection of the type and location of vents or weak sections of the collector to minimize injury to personnel and blast damage to nearby equipment or structures. Deflagration vents shall be positioned so that a potential blast shall not be directed towards njBCOmbustible or frangible structure.

STANTIATION: All dry dust collectors for aluminum dust should have an explosion vent. How is someone to determine if an explosion hazard exists? Aluminum dust is hazardous. COMMITTEE ACTION: Accept in Principle. Revise proposed 4-5.6* in the Report on Proposals to read:

4-5.6* Dry collectors used for combustible aluminum dust shall be provided with deflagration vents. The selection of the type and location of vents or weak sections of the collector shall be designed to minimize injury to personnel and blast and fire damage to nearby equipment or structures. COMMITTEE STATEMENT: The Committee revised the provision to clarify the need for careful selection of the location and design of deflagration vents for all dry collectors used for combustible aluminum dust. The Committee clarified that an explosion hazard exists in operations whenever combustible aluminum dust is present. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

(Log #8) 651- 8- (4-5.9): Reject SUBMITI'ER: Peter Levitt, Sternvent Co., Inc~ COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION: Revise text to read as follows: The dust collector shall be arranged so that contact between dust

~ articles and parts moving at high speeds shall be prevented. The lower for drawing the dust-laden air into the collector shall be

located on the clean air side of the collector and be on non- snarkin~ design. (See A-2-4.10.1L S'UBST~NTIATION: Even though the blower is on the clean air side, it should be of non-sparking type. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The Committee did not agree with the submitter's recommendation that a nonsparking fan on the clean air side of the dust collection system would substantially improve the safety of the system. No technical substantiation was provided by the submitter to support the proposed recommendation. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

(Log #CC1) 651- 9 - (6-7.1): Accept SUBMITrER: Technical Committee on Combustible Metals & Metal Dusts COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION:

In 6-7.1 in the Report on Proposals, revise the proposed wording of the third sentence to read:

Lockout/ragout procedures shall be followed for the shutdown of machinery. SUBSTANTIATION: Since there is no clear cut NFPA definition for the word "accepted," the Committee deleted it from the sentence. COMMITTEE ACTION: Accept. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITrEE ACTION:

AFFIRMATIVE: 9 ABSTENTION: i NOT RETURNED: I Domanico


651-1 (Log #1).

(Log #CC5) 651- 10 - (A-2-4.8.6): Accept SUBMn'TER: Technical Committee on Combustible Metals & Metal Dusts COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION:

I Add Appendix text for A-2-4.8.6 to read: A-2-4.8.6 See NFPA 68, Venting of Defiagrations for information

on spacing and sizing of ductwork deflagration vents. SUBSTANTIATION: The Committee added a reference to NFPA 68 that was inadvertently left out of the Report on Proposals. COMMITTEE ACTION: Accept. NUMBER OF COMMrrTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

12

N F P A 6 5 1 - - A 9 8 R O C

(Log #CC2) 651- 11 - (A-4-2.1): Accept SUBMITrER: Technlcal Committee on Combustible Metals & Metal Dusts COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION:

I In A-4-2.1 in the Report on Proposals, revise the proposed terminology from "lower flammable limit (LFL)" to "minimum explosible concentration (MEC)" in two places in the paragraph. Replace the word "explosive" with the word "explosible."

SUBSTANTIATION: The Committee revised the terminology to meet updated NFPA standards. COMMITTEE ACTION: Accept. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

(Log #CC4) 651- 13 - (A-4-7.g): Accept SUBMITTER: Technical Committee on Combustible Metals & Metal Dusts COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION:

In A-4~7.3 in the Report on Proposals, delete the proposed appendix text. SUBSTANTIATION: The Committee deleted a redundant PcrOVision that is already properly addressed in A-3-4.2.3.

OMMITTEE ACTION: Accept. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

(Log #4) 651- 12- (A-4-2.2): Reject SUBMITTER: Peter Levitt, Sternvent Co., Inc. COMMENT ON PROPOSAL NO: 651-1 RECOMMENDATION: Revise text to read as follows ~c.̂ _v.~.., If vossible, individual wet-type duct collectors ~ should

be providecl for each dust-producing machine so that duct-work connecting the hood or enclosure of the machine to the collector is as short as possible. SUBSTANTIATION: The sentence needed to be stronger. COMMITTEE ACTION: Reject. COMMITI'EE STATEMENT: The Committee believes that the language as proposed in the Report on Proposals is adequate as written. NUMBER OF COMMITTEE MEMBERS ELIGIBLE TO VOTE: 11 VOTE ON COMMITTEE ACTION:



651-1 (Log #1).

13

part i of dais report on comments was prepared by the ... · magnesium melt equipment, and are...

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