TECHNICAL COMMITTEE ON HOT WORK OPERATIONS · PDF fileTECHNICAL COMMITTEE ON HOT WORK OPERATIONS ... Purging of Flammable Gas Piping Systems, 2012 ... ASME B31.8, Gas Transmission

TECHNICAL COMMITTEE ON HOT WORK OPERATIONS

February 16, 2012 Hilton St. Louis Downtown

St. Louis, MO 8:00 a.m. to 5:00 p.m.

AGENDA

1. Meeting opening, introduction and attendance

2. Chair's remarks, Mark Blank

3. Staff Liaison update:

a. A2013 Schedule

b. NFPA’s re-engineering of the codes and standards process

4. Smoldering Task Group Report

5. NFPA 51B Report on Proposals (ROP)

a. Review and act on public proposals

b. Develop Committee Proposals (as appropriate)

i. Held Proposal - Ignition Temperature Table (Log #1a)

6. Other business

7. Next meeting – NFPA 51B ROC meeting (Closing date for Public Comments August 31, 2012). Based on the A2013 schedule, the meeting must occur prior to November 2, 2012 and discuss possible dates.

8. Adjournment

Attachment:

(1) NFPA 51B - A2013 Proposals

(2) NFPA 51B – Held 2008 ROC on Proposal 51B-10

Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #CP1 Final Action:(Entire Document)_______________________________________________________________________________________________Submitter: Technical Committee on Hot Work OperationsRecommendation: Review entire document to: 1) Update any extracted material by preparing separate proposals todo so, and 2) review and update references to other organizations documents, by preparing proposal(s) as required.

Chapter 2 Referenced Publications2.1 General. The documents or portions thereof listed in this chapter are referenced within this standard and shall beconsidered part of the requirements of this document.2.2 NFPA Publications. National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471.NFPA 10, Standard for Portable Fire Extinguishers, 2013NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, 201108edition.NFPA 51, Standard for the Design and Installation of Oxygen–Fuel Gas Systems for Welding, Cutting, and AlliedProcesses, 201307 edition.NFPA 55, Standard for the Storage, Use, and Handling of Compressed Gases and Cryogenic Fluids in Portable andStationary Containers, Cylinders, and Tanks, 201305 edition.NFPA 56 (PS), Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas PipingSystems, 2012 editionNFPA 241, Standard for Safeguarding Construction, Alteration, and Demolition Operations , 201304 edition.2.3 Other Publications.2.3.1 ANSI Publications. American National Standards Institute, Inc., 25 West 43rd Street, 4th Floor, New York, NY10036.ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes, 2005.2.3.2 Other Publications.Merriam-Webster’s Collegiate Dictionary, 11th edition, Merriam-Webster, Inc., Springfield, MA, 2003.2.4 References for Extracts in Mandatory Sections.NFPA 1, Fire Code, 201209 edition.3.3.4 Permit. A document issued by the authority having jurisdiction for the purpose of authorizing performance of aspecified activity. [1, 201209]

Annex C Informational ReferencesC.1 Referenced Publications.The following documents or portions thereof are referenced within this standard for informational purposes only and arethus not part of the requirements of this document unless also listed in Chapter 2.C.1.1 NFPA Publications. National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169–7471.NFPA 1, Fire Code, 201209 edition.NFPA 241, Standard for Safeguarding Construction, Alteration, and Demolition Operations , 201304 edition.NFPA 326, Standard for the Safeguarding of Tanks and Containers for Entry, Cleaning, or Repair, 201005 edition.NFPA 655, Standard for Prevention of Sulfur Fires and Explosions, 201207 edition.C.1.2 Other Publications.C.1.2.1 ANSI Publications. American National Standards Institute, Inc., 25 West 43rd Street, 4th Floor, New York, NY10036.ANSI/FM 4950, American National Standard for Evaluating Welding Pads, Welding Blankets and Welding Curtains forHot Work Operations, 2007.ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes, 20051999.C.1.2.2 ASME Publications. American Society of Mechanical Engineers, Three Park Avenue, New York, NY10016-5990.ASME B31.8, Gas Transmission and Distribution Piping Systems, 201000.C.1.2.3 AWS Publications. American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.AWS F-4.1, Recommended Safe Practices for the Preparation for Welding and Cutting Containers and Piping ,20071994.C.2 Informational References.The following documents or portions thereof are listed here as informational resources only. They are not a part of therequirements of this document.

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Report on Proposals – June 2013 NFPA 51BNFPA 61, Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities , 2008edition.NFPA 122, Standard for Fire Prevention and Control in Metal/Nonmetal Mining and Metal Mineral Processing Facilities ,201004 edition.NFPA 306, Standard for the Control of Gas Hazards on Vessels, 2009 edition.NFPA 312, Standard for Fire Protection of Vessels During Construction, Conversion, Repair, and Lay-Up, 201106edition.NFPA 909, Code for the Protection of Cultural Resource Properties — Museums, Libraries, and Places of Worship,201005 edition.C.3 References for Extracts in Informational Sections. (Reserved)

Substantiation: To conform to the NFPA Regulations Governing Committee Projects.


Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #9 Final Action:(1.1.1)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Revise text to read as follows:1.1.1 This standard shall cover provisions to prevent personal injury, loss of life and/or property from products of

combustion, fire or explosion as a result of hot work.Substantiation: A hot work operation can also be the source of a personal injury such as burns, blindness andintoxication.Products of combustion from these operations that may be harmful include: intense light, heat, toxic fumes, smoke,

metal air bone particles, vapors, dust, and gases.


Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #10 Final Action:(1.2)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Revise text to read as follows:1.2 Purpose. This standard shall provide safety guidance for persons, including outside contractors and property

managers, who manage, supervise, and perform request, authorize, perform and supervise hot work.Substantiation: Provisions presented in the standard are safety-related and need not to be confused withperformance driven provisions.People who have the empowerment to request and authorize hot work need to be acquainted with the precautions set

forth in the standard.


Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #11 Final Action:(1.3.2(8) (New) )_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Add new text to read as follows:1.3.2 This standard shall not apply to the following:(7) Lockout / tagout procedures during hot work(8) Cleaning and purging of flammable gas piping systems in preparation for hot work

Substantiation: NFPA 56 (PS), “Standard for Fire and Explosion Prevention During Cleaning and Purging ofFlammable Gas Piping Systems” covers the referenced topic.


Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #12 Final Action:(1.4.1)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Delete the following text:1.4.1 Unless otherwise specified, the provisions of this standard shall not apply to facilities, equipment, structures, or

installations that existed or were approved for construction or installation prior to the effective date of the standard.Where specified, the provisions of this standard shall be retroactive.Substantiation: Hot work is an operation – an “intangible service” rather than a physical product – and unlike facilities,equipment, structures, or installations; completed hot work operations cannot be modified. It is thus not possible to rulethat a new precaution be provided for a hot work operation that was performed anytime in the past. In this case newprovisions can only be applied to present and future (planned) operations and therefore any retroactive clause does notapply.


Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #13 Final Action:(2.2)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Add new text to read as follows:2.2 NFPA Publications.NFPA 55, Standard for the Storage, Use, and Handling of Compressed Gases and Cryogenic Fluids in Portable and

Stationary Containers, Cylinders, and Tanks, 2005 edition.NFPA 56 (PS), Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping

Systems, 2012 edition.Substantiation: Cleaning and purging of flammable gas piping systems is needed prior to conduct any hot workoperation in such systems.Committee Statement: See action on CP#1.


Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #14 Final Action:(3.3.2 Hot Work)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Revise text to read as follows:3.3.2 Hot Work. Work involving burning, welding, or a similar operation that is capable of initiating fires or explosions.

Hot work is defined as an operation that meets the following conditions:a. It produces heat, flames or sparksb. It is conducted outside a designated areac. It is a non-routine operationWork that it is capable of initiating fires or explosions, such as those listed in Section 1.3.1, are examples of hot work.

Substantiation: Some industrial settings; automobile manufacturing for example; use automated welding extensivelyin their production processes. These operations produce heat, flames and sparks but they are conducted in areas withproper precautions that prevent a fire from occurring. These operations are conducted on a routine basis; a conditionthat reinforces the need for a safe environment. Operations conducted under these circumstances do not pose asignificant fire hazard and therefore do not qualify as hot work.


Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #15 Final Action:(3.3.4 Permit)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Revise text to read as follows:3.3.4 Permit. A document issued by the authority having jurisdiction for the purpose of authorizing performance of a

specified activity. [1, 2009 2012]Substantiation: The 2012 edition of NFPA 1 has already been issued.Committee Statement: See action on CP#1.


Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #8 Final Action:(3.3.7 Welding Blanket, 3.3.8 Welding Curtain, and 3.3.9 Welding Pads)_______________________________________________________________________________________________Submitter: Marcelo M. Hirschler, GBH InternationalRecommendation: Revise text to read as follows:3.3.7* Welding Blanket. A heat-resistant fabric designed to be placed in the vicinity of a hot work operation. Intended

for use in horizontal applications with light to moderate exposures such as that resulting from chipping, grinding, heattreating, sand blasting, and light horizontal welding. Designed to protect machinery and prevent ignition of combustiblessuch as wood that are located adjacent to the underside of the blanket.3.3.8* Welding Curtain. A heat-resistant fabric designed to be placed in the vicinity of a hot work operation. Intendedfor use in vertical applications with light to moderate exposures such as that resulting from chipping, grinding, heattreating, sand blasting, and light horizontal welding. Designed to prevent sparks from escaping a confined area.3.3.9* Welding Pads. A heat-resistant fabric designed to be placed directly under a hot work operation such as weldingor cutting. Intended for use in horizontal applications with severe exposures such as that resulting from moltensubstances or heavy horizontal welding. Designed to prevent the ignition of combustibles that are located adjacent tothe underside of the pad.A.3.3.7 Welding Blanket. Intended for use in horizontal applications with light to moderate exposures such as thatresulting from chipping, grinding, heat treating, sand blasting, and light horizontal welding. Designed to protectmachinery and prevent ignition of combustibles such as wood that are located adjacent to the underside of the blanket.Welding blankets are required to be listed, approved, or the equivalent for such use. One such listing includes ANSI/FM4950, American National Standard for Evaluating Welding Pads, Welding Blankets and Welding Curtains for Hot WorkOperations.A.3.3.8 Welding Curtain. Intended for use in vertical applications with light to moderate exposures such as thatresulting from chipping, grinding, heat treating, sand blasting, and light horizontal welding. Designed to prevent sparksfrom escaping a confined area. Welding curtains are required to be listed, approved, or the equivalent for such use. Onesuch listing includes ANSI/FM 4950, American National Standard for Evaluating Welding Pads, Welding Blankets andWelding Curtains for Hot Work Operations.A.3.3.9 Welding Pads. Intended for use in horizontal applications with severe exposures such as that resulting frommolten substances or heavy horizontal welding. Designed to prevent the ignition of combustibles that are locatedadjacent to the underside of the pad. Welding pads are required to be listed, approved, or the equivalent for such use.One such listing includes ANSI/FM 4950, American National Standard for Evaluating Welding Pads, Welding Blanketsand Welding Curtains for Hot Work Operations.Substantiation: The NFPA Manual of Style requires definitions to be in single sentences. The added sentencesshould not be part of the definition (and in this case they are simply added explanations) but should be in the body of thedocument or in an annex note, as recommended in this proposal.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #18 Final Action:(4.1)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Revise text to read as follows:4.1* Responsibility Management. Management or a designated agent shall be responsible for the safe operations of

hot work activity. along with those who request, authorize, perform and supervise hot work operations, shall allrecognize their responsibility for safety in this type of operations.Substantiation: As stated in section 4.6, all persons involved in hot work operations should be responsible for safepractices; there is no need to have two sections with the same provision and section 4.6 should be deleted in favor or arevised version of section 4.1.

11Printed on 12/28/2011

Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #16 Final Action:(4.1.1)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Add new text to read as follows:4.1.1 Management. Management shall issue a hot work policy and help establish formal procedures, form permits and

an audit system to help manage hot work operations.Substantiation: A policy is needed to prevent discretionary use of the system; formal procedures are needed toeliminate room for confusion on what needs to be done regarding hot work; form permits are needed to help ensure thatrelevant precautions are not being overlooked, through a checklist, and also serve as proof of adherence to the system;an audit system will help detect and correct any deviations in the use of the established procedures.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #17 Final Action:(4.1.1(a), (b), and (c) (New) )_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Revise text to read as follows:4.1.1 Management shall establish permissible areas for hot work permission requirements for each area, as follows:a. Permissible areas. Areas as described in Sections 3.3.1 and 5.2.2.1b. Permit-required areas. Areas as described in Section 5.2.2.2c. Non-permissible areas. Areas as described in Section 5.3

Substantiation: Designating a fire hazard level for each area, will help prevent room for confusion as to the safetyprecautions required on each of them.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #2 Final Action:(4.1.6.3)_______________________________________________________________________________________________Submitter: Robert Bourke, Northeastern Regional Fire Code Development CommitteeRecommendation: Add new Section 4.1.6.3 to read as follows:Individuals involved in hot work operations shall be cognizant of weather conditions such as changes and increases in

the wind that may necessitate the use of a fire watch and/or hot work permits that may otherwise not have been requiredprior to the changes in weather conditions.Substantiation: Information added is of a significant concern regarding fire hazard recognition of those individualsinvolved in hot work operations in that weather conditions oftentimes contribute to fires from wind-driven sparks or hotproducts that may travel beyond that which was anticipated prior to changes in weather conditions.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #19 Final Action:(5.2.2.1)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Revise text to read as follows:5.2.2.1 3.3.1 Designated Areas. A designated area shall be a specific area designed or approved for hot work, such as

a maintenance shop or a detached outside location that is of noncombustible or fire-resistive construction, essentiallyfree of combustible and flammable contents, and suitably segregated from adjacent areas.Substantiation: The “Designated Area” definition in section 5.2.2.1 is more comprehensive than the definition insection 3.3.1; there is no need to have two definitions of the same concept in the standard.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #20 Final Action:(5.2.2.2.1)_______________________________________________________________________________________________Submitter: Sergio Linan, Zurich Insurance CompanyRecommendation: Revise text to read as follows:5.2.2.2.1 3.3.6 Permit-Required Area. A permit-required area shall be an area that is made fire safe by removing or

protecting combustibles from ignition sources.Substantiation: Section 5.2.2.1 is a term definition which should be part of Chapter 3.

16Printed on 12/28/2011

Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #4 Final Action:(5.3(6) (New) )_______________________________________________________________________________________________Submitter: James Everitt, Western Regional Fire Code Development CommitteeRecommendation: Revise text to read as follows:5.3* Nonpermissible Areas. Hot work shall not be permitted in the following areas:(6) Elevated Locations where wind can carry hot embers beyond the view of the fire watch unless measures are taken.

Substantiation: Personnel experience on a television tower grass fires were breaking out blocks away.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #3 Final Action:(5.5.1(5))_______________________________________________________________________________________________Submitter: Robert Bourke, Northeastern Regional Fire Code Development CommitteeRecommendation: Add new Section to read as follows:

Pipes or other metals involved in hot work process are in contact with combustible walls, partitions, ceilings, roofs, orother combustibles that may cause ignition by conduction.Substantiation: This new text incorporates fire hazard recognition common to hot work operations and fire causationresulting from a common heat transfer mechanism.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #6 Final Action:(7.4.1)_______________________________________________________________________________________________Submitter: Scott Adams, Western Regional Fire Code Development CommitteeRecommendation: Revise text to read as follows:7.4.1 Fire Extinguishers. Each site shall be provided with a portable fire extinguisher of appropriate size and type in

accordance with NFPA 10, Standard for Portable Fire Extinguishers, and with a pail of water.Substantiation: Gives guidance to user and PAI on the selection and type of fire extinguishers to be used for the givensituation and hazard.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #7 Final Action:(7.4.3.1)_______________________________________________________________________________________________Submitter: Scott Adams, Western Regional Fire Code Development CommitteeRecommendation: Add new text to read as follows:7.4.3.1 Permits. When required by the AHJ, permits shall be obtained from the local AHJ.

Substantiation: In many jurisdictions local fire codes require the AHJ to issue permits for these types of operations inPublic Exhibitions and Demonstrations. By adding this reference, it will assist the user by identifying to PAI to verify thata permit is needed by AHJ.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #1 Final Action:(A.3.3.7, A.3.3.8, and A.3.3.9 (New) and A.5.4.2(2)(a), A.5.4.2(3)(a), and A.5.4.2(6) (New))_______________________________________________________________________________________________Note: This Proposal originates from Tentative Interim Amendment 51B-09-1 (TIA 909) issued by the StandardsCouncil on July 24, 2008.Submitter: Steven E. Daily, Anheuser-Busch CompaniesRecommendation: 1. Add the following new annex items to the following definitions:A.3.3.7 Welding Blanket. Welding blankets are required to be listed or approved or equivalent for such use. One

such listing includes ANSI FM4950, Welding Pads, Welding Blankets and Welding Curtains for Hot Work Operations.A.3.3.8 Welding Curtains. Welding curtains are required to be listed or approved or equivalent for such use. One

such listing includes ANSI FM4950, Welding Pads, Welding Blankets and Welding Curtains for Hot Work Operations.A.3.3.9 Welding Pads. Welding pads are required to be listed or approved or equivalent for such use. One such

listing includes ANSI FM4950, Welding Pads, Welding Blankets and Welding Curtains for Hot Work Operations.2. Add the following new annex items to the following sections:5.4.2(2)(a)* Combustible floors shall be kept wet, covered with damp sand, or protected by a listed or approved

welding blanket or welding pad or equivalent.A.5.4.2(2)(a) One such listing includes ANSI FM4950, Welding Pads, Welding Blankets and Welding Curtains for Hot

Work Operations.5.4.2(3)(a)* If relocation is impractical, combustibles shall be protected by a listed or approved welding curtain, blanket,

or welding pad or equivalent.A.5.4.2(3)(a) One such listing includes ANSI FM4950, Welding Pads, Welding Blankets and Welding Curtains for Hot

Work Operations.5.4.2(6)* If hot work is done near walls, partitions, ceilings, or roofs of combustible construction, they shall be protected

by a listed or approved welding curtain, blanket, or welding pad or equivalent.A.5.4.2(6) One such listing includes ANSI FM4950, Welding Pads, Welding Blankets and Welding Curtains for Hot

Work Operations.Substantiation: The request is emergency in nature because ANSI FM4950 was not available previously. It isimperative to public safety that users are aware that there is a standard to which their products (welding pads, blanketsand curtains for welding) can be listed for the use, thereby contributing to lessening a recognized hazard. The standardis an advance in safeguarding property and life and was previously unavailable to the public.

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Report on Proposals – June 2013 NFPA 51B_______________________________________________________________________________________________51B- Log #1a Final Action:(Figure A.5)_______________________________________________________________________________________________Note: This proposal appeared as Comment 51B-2 (Log #CC3) which was held from the Annual 2008 ROC onProposal 51B-10.Submitter: Technical Committee on Hot Work OperationsRecommendation: Do not incorporate this figure, but consider citing an authoritative reference to add for the nextrevision.Substantiation: As noted in Gus Manz' comments on the affirmative on this proposal, the apparatus doesn't have thetemperature, but rather the flame itself. Additionally, the source should be cited as well as incorporating otherinformation. A Task Group of Mark Blank and Chris Bloom will work on this and will submit a specific proposal for nextrevision.

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51B-4

Report on Proposals A2008 — Copyright, NFPA NFPA 51B application; or equivalent was added to allow other noncombustible materials to be used to protect the space, such as fire rated drywall. In (3)(a) and 4, “fire-retardant” was removed because the term “fire-retardant” if often misused. In (4) and (6) the term “fire-rated” was added to allow materials with proven performance capabilities. Number Eligible to Vote: 13 Ballot Results: Affirmative: 12 Ballot Not Returned: 1 Nicholson, III, R. Comment on Affirmative: BLANK, M.: For this Log, the Committee agreed to use of the wording “listed” for hot work blankets/curtains/pads to identify qualifications for safety products used to isolate hot work activities from combustible construction and/or occupancies. Since the Committee ROP meeting in February 2007, ANSI has adopted the FM 4950 standard for hot work blankets/pads/curtains as noted in the e-mail attached below and the copy of the ANSI standard also included with this communication. Therefore, I would like to propose the Committee adopt ANSI FM 4950 as the required certification in NFPA 51B for acceptable hot work blankets/pads/curtains used for proper isolation of hot work operations from combustible construction and/or occupancies. Note: Supporting material is available for review at NFPA Headquarters. MANZ, A.: In “welding curtain” section, line 2, insert “essentially” in front of “vertical”. Some work is not truly vertical or horizontal. Line 3, delete “horizontal”. For the same reason. Globally- either add a definition that as used herein the term welding includes cutting, or wherever “welding” is used replace it with “welding or cutting”. In “Welding Blanket” section, line 2, insert “essentially” in front of “horizontal”. Some work is not truly horizontal or vertical. Line 3, for the same reason delete “horizontal”. In “welding pads” section, line 1, after “under” insert “or in the path of”. Some spatter etc. can be ejected wherever the welding or cutting is aimed. Line 2 and 3, delete “horizontal” for the same reason. _______________________________________________________________ 51B-9 Log #CP4 Final Action: Accept (5.4.2 and A.5.4.2) ________________________________________________________________ Submitter: Technical Committee on Hot Work Operations, Recommendation: Modify 5.4.2 and delete A.5.4.2 as follows: A fire watch shall be maintained for at least ½ hour after completion of hot work operations in order to detect and extinguish smoldering fires. The duration of the fire watch shall be extended if the PAI determines the fire hazards warrant the extension. Substantiation: The 1/2 hour requirement may not be sufficient for many hazards. By moving the advisory material to the body, the requirement better addresses the potential hazard. Committee Meeting Action: Accept Number Eligible to Vote: 13 Ballot Results: Affirmative: 12 Ballot Not Returned: 1 Nicholson, III, R. _______________________________________________________________ 51B-10 Log #8 Final Action: Accept in Principle (A.5) ________________________________________________________________ Submitter: Mark E. Blank, FM Global Recommendation: Considering adding a reference chart within the Annex section which provides a comparison of various hot work equipment operating temperatures vs. ignition temperatures of common combustible materials. An example might be as follows:

Substantiation: Many individuals who conduct hot work operations as part of their normal work profession, become complacent to the very real fire potential that can exist with hot work activities. The suggested comparison chart provides a clear, mental picture of the very real potential for a fire when hot work is conducted in the presence of most combustible materials. The intent of providing such a comparison chart is to consciously raise the hot work fire hazard awareness whenever this type of activity is conducted. Committee Meeting Action: Accept in Principle The table will be added as submitted with the following changes: The oxygen/acetylene cutting torch will be corrected to read “5615F” and the Electric Arc Welder will be >10,000F. Committee Statement: The committee requested that the submitter provide more material and heats of combustion. This will be provided as a comment. Number Eligible to Vote: 13 Ballot Results: Affirmative: 12 Ballot Not Returned: 1 Nicholson, III, R. Comment on Affirmative: MANZ, A.: The chart is not satisfactory as composed. It is not the “Electric Arc Welder” that is hot, it is the “electric arc”. The spatter etc., will be at the melting temperature of the metal etc. Only the arc has such a high temperature. Also, add the symbol for “greater than”, or the words. Similarly, for all the other listings. It is not the equipment, but the flame, spark, etc. Finally, some of the temperatures are incorrect. Flame temperatures depend on the amount of oxygen present. The AWS usually cites the temperature of neutral flames, in the case of propane it is 4579F (see the “Welding Handbook”, volume 2, part 1, page 472). Be extra careful here. _______________________________________________________________ 51B-11 Log #CP5 Final Action: Accept (Figure A.5.3.1(a)) ________________________________________________________________ Submitter: Technical Committee on Hot Work Operations, Recommendation: Update the existing Sample Hot Work Permit in Figure A.5.3.1(a) to make the format more user-friendly, incorporating a single page format. Substantiation: The sample permit should only reflect requirements found in NFPA 51B. Committee Meeting Action: Accept Committee Statement: A task group was formed to update the format and submit the work as a Comment. Number Eligible to Vote: 13 Ballot Results: Affirmative: 12 Ballot Not Returned: 1 Nicholson, III, R. _______________________________________________________________ 51B-12 Log #CP2 Final Action: Accept (Figure A.5.3.1(b)) ________________________________________________________________ Submitter: Technical Committee on Hot Work Operations, Recommendation: Delete existing Figure A.5.3.1(b). Substantiation: FM updated their hot work permit and the older permit is no longer relevant. The updated permit was not used because there were numerous requirements on the FM permit that were more stringent than the minimum requirements in NFPA 51B. Committee Meeting Action: Accept Number Eligible to Vote: 13 Ballot Results: Affirmative: 12 Ballot Not Returned: 1 Nicholson, III, R. Comment on Affirmative: DAILY, S.: I agree with the concept to create an updated permit. After the ROP meeting, the task group came up with the following permit for consideration at the ROC. I am submitting it as my comment so it can have the benefit of public review. See Hot Work Permit on the next page. MANZ, A.: Whatever hot work permit is used, delete trade names such as COBOL. We should not use trade names.

Heat Source Temperature RatingsElectric Arc Welder 10,900 F (6,038 C)Oxygen/Acetylene Cutting Torch 6,330 F (3,499 C)

Propane Torch 3,595 F (1,979 C)Welding Torch Slag >2,000 F (1,093 C)Electric Heat Gun 600 – 1,350 F (316 – 732 C)Radial Metal Cutting Saw >1,000 F (538 C)Wheel Grinder >1,000 F (538 C)

Ignition Temperature

Styrene 914 F (490 C)

Typical Asphalt 905 F (485 C)Polyurethane Foam 824 F (440 C)

Lubricating Oil (Motor/Mineral) 500 – 700 F (260 – 371 C)Mineral Spirits 473 F (245 C)Wood Products 380 – 800 F (193 – 427 C)Corrugated Paper 380 – 500 F (193 – 260 C)

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TECHNICAL COMMITTEE ON HOT WORK OPERATIONS · PDF fileTECHNICAL COMMITTEE ON HOT WORK OPERATIONS ... Purging of Flammable Gas Piping Systems, 2012 ... ASME B31.8, Gas Transmission