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3 Chapter 6 formerly Chapter 4 Electrical and Other Sources of Ignition was. extensively revised to recognize the Zone concept of area classification Included in. those revisions were the addition of appropriate definitions and revisions of the. figures illustrating the area classifications in and around dipping and coating. 4 Subsection 7 6 1 formerly 5 5 1 was revised to allow recirculation of exhaust air. under certain conditions and to specify those conditions. 5 Chapter 9 formerly Chapter 7 Protection was revised to correlate with Chapter 9. Protection of NFPA 33 Standard for Spray Application Using Flammable or. Combustible Materials, 6 Section 11 6 formerly Section 9 6 was revised to require grounding as well as. de energizing of the electrostatic circuit, The following major changes have been adopted for the 2007 edition. 1 A number of definitions have been changed to incorporate preferred definitions to. ensure consistent meaning and use of defined terms throughout the National Fire. Codes Where preferred definitions cannot be used for certain terms those terms. have been delimited by the phrase For the purposes of this standard. 2 New definitions have been added for the terms electrostatic detearing peripheral. vapor containment secondary enclosure solvent cleaning and ventilation. 3 Requirements for hazardous location electrical utilization equipment and wiring have. been further revised to correlate with NFPA 70 National Electrical Code. including appropriate Fine Print Notes from NFPA 70. 4 New diagrams have been added to illustrate electrical area classification around open. dipping and coating processes, 5 Quantity limitations for storing flammable and combustible liquids have been changed. to correlate with NFPA 30 Flammable and Combustible Liquids Code. 6 Chapter 9 Protection has been completely rewritten to accomplish the following. a Correlate with NFPA 33 Standard for Spray Application Using Flammable or. Combustible Materials, b Add necessary requirements for interlocks for proper operation of fire. protection systems, c Require fire protection systems to be designed so that operation does not result.
in a spill of the flammable or combustible liquid, d Require fire protection systems to discharge into the entire protected area. 7 A section on solvent distillation units i e solvent recyclers has been added. 8 Additional changes have been made to correlate this standard with NFPA 33. Standard for Spray Application Using Flammable and Combustible Materials. Copyright NFPA,Technical Committee on Finishing Processes. Steven J Gunsel Chair,SGTechnologies LLC OH SE,Thomas G Euson Secretary. 3S Incorporated OH IM, William C Anderson Approved Fire Protection Company Inc MI IM. Rep National Assn of Fire Equipment Distributors,John D Bloomgren Infinity Precision LLC MN M.
John E Cieslik Ford Motor Company MI U,Paul H Dobson FM Global MA I. Dean Doherty General Motors North America MI U,Rep NFPA Industrial Fire Protection Section. Robert J Feldkamp Nordson Corporation OH M,Rob J Friberg Wausau Insurance Companies WI I. Rep Property Casualty Insurers Association of America. Paul B Gentry Zurich Services Corporation TN I,John Gokey Tyco Safety Products WI M. Rep Fire Equipment Manufacturers Association, Dennis P Jenkins Royal SunAlliance Global Consulting NC I.
Rep American Insurance Services Group,Steven D Jensen 3M Company MN U. John S Jurasic Baker Equipment Inc CO IM,John Katunar III GE Insurance Solutions MO I. John C Larson DuPont Performance Coatings PA M,Dennis P Mason Marsh Risk Consulting MI I. John McKnight National Marine Manufacturers Association DC U. Rep Society of the Plastics Industry Inc,Copyright NFPA. Lowell Miles Miles Fiberglass Composites OR U,Rep American Composites Manufacturers Association.
Gregory M Murin St Paul Travelers CT I,G Randall Nance Automated Fire Systems Inc NC IM. Allen L Pirro Intertek Testing Services NA Inc NY RT. Douglas A Rivord Graco Inc MN M,Don R Scarbrough Elyria OH SE. Michael A Slowinske Underwriters Laboratories Inc IL RT. Barry Thomas BT Consulting GA SE,Larry L Utterback ITW Ransburg IN M. W H White White Consulting Services OH SE,Alternates. Donald W Ankele Underwriters Laboratories Inc IL RT. Alt to M A Slowinske,Bradley A Byron Graco Inc MN M.
Alt to D A Rivord, Christopher J Gates Zurich Services Corporation IL I. Alt to P B Gentry,Thomas B George Marsh USA Inc MI I. Alt to D P Mason,George K Hayes Nordson Corporation GA M. Alt to R J Feldkamp,Kenneth A Mier Amerex Corporation AL M. Alt to J Gokey,Kenneth J Pilat Liberty Mutual Property FL I.
Alt to R J Friberg,Michael C Rodgers ITW Industrial Finishing IN M. Alt to L L Utterback,Copyright NFPA,Ronald A Schulz GE Insurance Solutions MI I. Alt to J Katunar III, John Schweitzer American Composite Manufacturers Association MI U. Alt to L Miles,Dale W Soos Intertek NY RT,Alt to A L Pirro. Matthew I Chibbaro U S Department of Labor DC E,Robert P Benedetti NFPA Staff Liaison.
This list represents the membership at the time the Committee was balloted on the final text. of this edition Since that time changes in the membership may have occurred A key to. classifications is found at the back of the document. NOTE Membership on a committee shall not in and of itself constitute an endorsement of. the Association or any document developed by the committee on which the member serves. Committee Scope This Committee shall have primary responsibility for documents on. safeguarding against the fire and explosion hazards associated with spray application. processes dipping processes coating processes and other similar processes including glass. fiber resin fabrication processes except for certain dipping processes that are within the. scope of the Committee on Ovens and Furnaces,Standard for. Dipping and Coating Processes Using Flammable or Combustible Liquids. 2007 Edition, IMPORTANT NOTE This NFPA document is made available for use subject to. important notices and legal disclaimers These notices and disclaimers appear in all. publications containing this document and may be found under the heading Important. Notices and Disclaimers Concerning NFPA Documents They can also be obtained on. request from NFPA or viewed at www nfpa org disclaimers. NOTICE An asterisk following the number or letter designating a paragraph indicates. that explanatory material on the paragraph can be found in Annex A. Changes other than editorial are indicated by a vertical rule beside the paragraph table or. figure in which the change occurred These rules are included as an aid to the user in. identifying changes from the previous edition Where one or more complete paragraphs have. been deleted the deletion is indicated by a bullet between the paragraphs that remain. A reference in brackets following a section or paragraph indicates material that has been. extracted from another NFPA document As an aid to the user the complete title and edition. Copyright NFPA, of the source documents for extracts in mandatory sections of the document are given in. Chapter 2 and those for extracts in informational sections are given in Annex D Editorial. changes to extracted material consist of revising references to an appropriate division in this. document or the inclusion of the document number with the division number when the. reference is to the original document Requests for interpretations or revisions of extracted. text shall be sent to the technical committee responsible for the source document. Information on referenced publications can be found in Chapter 2 and Annex D. Chapter 1 Administration, 1 1 1 This standard shall apply to processes in which articles or materials are passed through. tanks vats containers or process equipment that contain flammable or combustible liquids. including but not limited to dipping roll coating flow coating curtain coating and cleaning. 1 1 2 This standard shall also apply to dipping and coating processes that use water borne. water based and water reducible materials that contain flammable or combustible liquids or. that produce combustible deposits or residues, 1 1 3 This standard shall not apply to dipping and coating processes that use only.
noncombustible liquids, 1 1 4 This standard shall not apply to dipping and coating processes that use a liquid that. does not have a fire point when tested in accordance with ASTM D 92 Standard Test. Method for Flash and Fire Points by Cleveland Open Cup up to the boiling point of the. liquid or up to a temperature at which the sample being tested shows an obvious physical. 1 1 5 This standard shall not apply to electrostatic fluidized bed powder application See. Section 15 13 of NFPA 33 Standard for Spray Application Using Flammable or. Combustible Materials,1 2 Purpose, 1 2 1 The purpose of this standard shall be to provide requirements for fire safety for. dipping and coating processes that use flammable or combustible liquids Given that this. standard anticipates conditions of average use the authority having jurisdiction shall be. permitted to require additional safeguards or modifications to the requirements of this. standard where unusual industrial processes are involved provided equivalent safety is. 1 2 2 The purpose of this standard shall be to address only the fire and explosion hazards. of dipping and coating processes and operations This standard shall not address toxicity or. industrial hygiene,1 3 Application,Copyright NFPA, Chapters 4 through 10 and Chapter 12 shall apply to all dipping and coating processes. Chapter 11 shall apply only to dipping and coating processes that include electrostatic. detearing systems,1 4 Retroactivity, The provisions of this standard reflect a consensus of what is necessary to provide an. acceptable degree of protection from the hazards addressed in this standard at the time the. standard was issued, 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, 1 4 2 In those cases where the authority having jurisdiction determines that the existing. situation presents an unacceptable degree of risk the authority having jurisdiction shall be. permitted to apply retroactively any portions of this standard deemed appropriate. 1 4 3 The retroactive requirements of this standard shall be permitted to be modified if their. application clearly would be impractical in the judgment of the authority having jurisdiction. and only where it is clearly evident that a reasonable degree of safety is provided. 1 5 Equivalency, Nothing in this standard is intended to prevent the use of systems methods or devices of. equivalent or superior quality strength fire resistance effectiveness durability and safety. over those prescribed by this standard, 1 5 1 Technical documentation shall be submitted to the authority having jurisdiction to. demonstrate equivalency, 1 5 2 The system method or device shall be approved for the intended purpose by the. authority having jurisdiction,1 6 Units and Formulas.
The units of measurement used in this standard shall be the International System of Units. otherwise known as SI and Modernized Metric System English customary units are. given in parentheses following SI units but shall be considered to be approximate. conversions,1 7 Enforcement,Chapter 2 Referenced Publications. 2 1 General,Copyright NFPA, The documents or portions thereof listed in this chapter are referenced within this standard. and shall be considered 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 2007 edition. NFPA 11 Standard for Low Medium and High Expansion Foam 2005 edition. NFPA 12 Standard on Carbon Dioxide Extinguishing Systems 2005 edition. NFPA 13 Standard for the Installation of Sprinkler Systems 2007 edition. NFPA 15 Standard for Water Spray Fixed Systems for Fire Protection 2007 edition. NFPA 17 Standard for Dry Chemical Extinguishing Systems 2002 edition. NFPA 30 Flammable and Combustible Liquids Code 2003 edition. NFPA 33 Standard for Spray Application Using Flammable or Combustible Materials. 2007 edition,NFPA 70 National Electrical Code 2005 edition. NFPA 72 National Fire Alarm Code 2007 edition, NFPA 91 Standard for Exhaust Systems for Air Conveying of Vapors Gases Mists and.
Noncombustible Particulate Solids 2004 edition, NFPA 2001 Standard on Clean Agent Fire Extinguishing Systems 2004 edition. 2 3 Other Publications,2 3 1 AIHA Publications, American Industrial Hygiene Association 2700 Prosperity Avenue Suite 250 Fairfax VA. ANSI AIHA Z9 7 American National Standard for the Recirculation of Air from Industrial. Process Exhaust Systems 1998,2 3 2 ANSI Publications. American National Standards Institute Inc 25 West 43rd Street 4th Floor New York NY. ANSI Z535 Safety Signs Series IS 2002,2 3 3 ASME Publications. American Society of Mechanical Engineers Three Park Avenue New York NY. 10016 5990, ASME Boiler and Pressure Vessel Code Section VIII 2004.
Copyright NFPA,2 3 4 ASTM Publications, ASTM International 100 Barr Harbor Drive P O Box C700 West Conshohocken PA. 19428 2959, ASTM D 5 Standard Method of Test for Penetration for Bituminous Materials 1997. ASTM D 92 Standard Test Method for Flash and Fire Points by Cleveland Open Cup. ASTM E 136 Standard Test Method for Behavior of Materials in a Vertical Tube Furnace. at 750 C 1999,2 3 5 UL Publications, Underwriters Laboratories Inc 333 Pfingsten Rd Northbrook IL 60062 2096. UL 2208 Standard for Solvent Distillation Units 1998. 2 3 6 Other Publications, Merriam Webster s Collegiate Dictionary 11th edition Merriam Webster Inc Springfield. 2 4 References for Extracts in Mandatory Sections, NFPA 30 Flammable and Combustible Liquids Code 2003 edition.
NFPA 70 National Electrical Code 2005 edition, NFPA 220 Standard on Types of Building Construction 2006 edition. Chapter 3 Definitions,3 1 General, The definitions contained in this chapter shall apply to the terms used in this standard Where. terms are not defined in this chapter or within another chapter they shall be defined using. their ordinarily accepted meanings within the context in which they are used. Merriam Webster s Collegiate Dictionary 11th edition shall be the source for the ordinarily. accepted meaning,3 2 NFPA Official Definitions, 3 2 1 Approved Acceptable to the authority having jurisdiction. 3 2 2 Authority Having Jurisdiction AHJ An organization office or individual. responsible for enforcing the requirements of a code or standard or for approving. equipment materials an installation or a procedure. 3 2 3 Labeled Equipment or materials to which has been attached a label symbol or other. identifying mark of an organization that is acceptable to the authority having jurisdiction and. concerned with product evaluation that maintains periodic inspection of production of. Copyright NFPA, labeled equipment or materials and by whose labeling the manufacturer indicates compliance. with appropriate standards or performance in a specified manner. 3 2 4 Listed Equipment materials or services included in a list published by an. organization that is acceptable to the authority having jurisdiction and concerned with. evaluation of products or services that maintains periodic inspection of production of listed. equipment or materials or periodic evaluation of services and whose listing states that either. the equipment material or service meets appropriate designated standards or has been tested. and found suitable for a specified purpose, 3 2 5 Standard A document the main text of which contains only mandatory provisions.
using the word shall to indicate requirements and which is in a form generally suitable for. mandatory reference by another standard or code or for adoption into law Nonmandatory. provisions shall be located in an appendix or annex footnote or fine print note and are not. to be considered a part of the requirements of a standard. 3 3 General Definitions, 3 3 1 Boiling Point The temperature at which the vapor pressure of a liquid equals the. surrounding atmospheric pressure 30 2003,3 3 2 Coating Processes. 3 3 2 1 Curtain Coating A process by which an object or material is coated by passing it. through a vertically flowing film of liquid, 3 3 2 2 Dip Coating A process by which objects or materials are immersed in a liquid. 3 3 2 3 Flow Coating A process by which the coating liquid is discharged in an unatomized. state from nozzles slots or other openings onto the object or material to be coated. 3 3 2 4 Roll Coating The process of applying or impregnating objects or materials with the. coating liquid by bringing them into contact with a roller that is coated with a liquid. 3 3 3 Container Any vessel of 450 L 119 gal or less capacity used for transporting or. storing liquids 30 2003, 3 3 3 1 Closed Container A container as herein defined so sealed by means of a lid or. other device that neither liquid nor vapor will escape from it at ordinary temperatures 30. 3 3 4 Dip Tank A tank vat or container of flammable or combustible liquid into which. objects or materials are immersed for the purpose of coating cleaning or similar processes. 3 3 5 Electrical Utilization Equipment Equipment that utilizes electric energy for. electronic electromechanical chemical heating lighting or similar purposes 70 2005. 3 3 6 Electrostatic Detearing A process for removing excess wet coating material such as. drips from the bottom edge of a dipped or coated object or material by passing it through an. electrostatic field,Copyright NFPA, 3 3 7 Liquid Any material that has a fluidity greater than that of 300 penetration asphalt.
when tested in accordance with ASTM D 5 Standard Method of Test for Penetration of. Bituminous Materials 30 2003, 3 3 7 1 Combustible Liquid A liquid that has a closed cup flash point at or above 100 F. 37 8 C Combustible Liquid Classification Combustible Liquid Class II Any liquid that has. a flash point at or above 100 F 37 8 C and below 140 F 60 C Combustible Liquid Class. IIIA Any liquid that has a flash point at or above 140 F 60 C but below 200 F 93 C. Combustible Liquid Class IIIB Any liquid that has a flash point at or above 200 F 93 C. 3 3 7 2 Flammable Liquid A liquid that has a closed cup flash point that is below 100 F. 37 8 C and a maximum vapor pressure of 40 psia 2068 mm Hg at 100 F 37 8 C. Flammable Liquid Classification Flammable Liquid Class I Any liquid that has a closed cup. flash point below 100 F 37 8 C and a Reid vapor pressure not exceeding 40 psia 2068 6. mm Hg at 100 F 37 8 C Flammable Liquid Class IA Any liquid that has a flash point. below 73 F 22 8 C and a boiling point below 100 F 37 8 C Flammable Liquid Class. IB Any liquid that has a flash point below 73 F 22 8 C and a boiling point at or above. 100 F 37 8 C Flammable Liquid Class IC Any liquid that has a flash point at or above. 73 F 22 8 C but below 100 F 37 8 C, 3 3 8 Noncombustible Material A material that in the form in which it is used and under. the conditions anticipated will not ignite burn support combustion or release flammable. vapors when subjected to fire or heat Materials that are reported as passing ASTM E 136. are considered noncombustible materials 220 2006, 3 3 9 Peripheral Vapor Containment A system that cools the perimeter of a vapor. degreaser tank near its top for the purpose of condensing a saturated vapor blanket from. boiling flammable solvent, 3 3 10 Secondary Enclosure An enclosure or guard constructed around but separate from. a dipping or coating process whose purpose is other than for fire protection confinement of. a possible fire or confinement of vapor or mists, 3 3 11 Solvent Cleaning The removal of material from an object by a solvent using.
processes such as immersing soaking spraying agitating or ultrasonics. 3 3 12 Vapor Area Any area in the vicinity of 1 a dipping or coating process and its. drainboard 2 associated drying or conveying equipment 3 the interior of any exhaust. plenum or any exhaust duct leading from the process 4 other associated equipment that. could contain a flammable vapor concentration exceeding 25 percent of the lower flammable. limit LFL during operation or shutdown periods, 3 3 13 Vapor Source The liquid exposed in the process and on the drainboard Also any. dipped or coated object from which it is possible to measure vapor concentrations exceeding. 25 percent of the lower flammable limit at a distance of 305 mm 1 ft in any direction from. the object, 3 3 14 Ventilation For the purposes of this standard movement of air that is provided for. the prevention of fire and explosion and is sufficient to prevent accumulation of vapor air. Copyright NFPA, mixtures in concentrations over 25 percent of the lower flammable limit. Chapter 4 Location of Dipping and Coating Processes. Chapter 4 shall apply to the location of dipping and coating processes in buildings and with. respect to other operations or processes This chapter shall designate acceptable and. unacceptable locations for dipping and coating processes. 4 2 Separation, Dipping and coating processes shall be separated from other operations materials or. occupancies by location fire walls fire partitions or other means acceptable to the authority. having jurisdiction,4 3 Locations Below Grade, Dipping and coating processes shall not be located below the surrounding grade level in.
cases where flammable vapors that are heavier denser than air cannot be captured and. directed to the outside of the building,4 4 Access to Means of Egress. Dipping and coating processes shall be located so that in the event of a fire originating at or. within the process equipment access to means of egress will not be impaired. 4 5 Locations in Other Occupancies, Dipping and coating processes shall not be located in any building that is classified as an. assembly educational day care health care ambulatory health care detention correctional. institutional or residential occupancy unless they are located in a room that is separated. both vertically and horizontally from all surrounding areas by construction having a fire. resistance rating of at least 2 hours and that is protected by an approved automatic sprinkler. system designed and installed in accordance with NFPA 13 Standard for the Installation of. Sprinkler Systems, Chapter 5 Design and Construction of Dipping and Coating. Equipment and Systems, Chapter 5 shall apply to the design and construction of dipping and coating process. equipment and systems,5 2 General Requirements,Copyright NFPA.
5 2 1 Dipping and coating equipment shall be constructed of steel reinforced concrete. masonry or other noncombustible material and shall be securely and rigidly supported. Supports for dipping and coating tanks that exceed either 1900 L 500 gal capacity or 1 m 2. 10 ft 2 of liquid surface shall have a fire resistance rating of at least 1 hour. 5 2 2 If the dipping or coating equipment is enclosed for the purpose of confining vapors. and mists any panels for light fixtures or for observation shall be of heat treated glass. laminated glass wired glass or hammered wired glass and the panels shall be sealed to. confine vapors or mists to the enclosure, If secondary enclosures are provided including those installed for environmental purposes. designed to capture low level fugitive emissions as well as those used for the purpose of. any vision panels shall not be required to meet the requirements of 5 2 2. 5 2 2 1 Panels for light fixtures shall be separated from the fixture to prevent the surface. temperature of the panel from exceeding 93 C 200 F. 5 2 2 2 The panel frame and method of attachment shall be designed to not fail under fire. exposure before the vision panel fails,5 3 Height Above Floor. The top of the dipping or coating tank shall be at least 150 mm 6 in above the floor. 5 4 Overflow Prevention, To prevent the overflow of burning liquid from the dipping or coating tank if a fire in the. tank actuates automatic sprinklers one or more of the following shall be done. 1 Drainboards shall be arranged so that sprinkler discharge will not flow into the tank. 2 Tanks shall be equipped with automatic closing covers. 3 Tanks shall be equipped with overflow pipes See Section 5 6. 5 5 Liquid Level, The liquid in the dipping or coating tank shall be maintained at a level that is at least 150 mm. 6 in below the top of the tank to allow effective application of extinguishing agents in the. event of fire,5 6 Overflow Pipes, 5 6 1 Dipping or coating tanks that exceed 570 L 150 gal capacity or 1 m 2 10 ft 2 of.
liquid surface shall be equipped with a trapped overflow pipe leading to a safe location. 5 6 2 Depending on the area of the liquid surface and the length and pitch of pipe overflow. pipes for dipping or coating tanks that exceed 570 L 150 gal capacity or 1 m 2 10 ft 2 of. liquid surface shall be capable of handling either the maximum rate of delivery of process. liquid or the maximum rate of automatic sprinkler discharge whichever is greater The. Copyright NFPA, overflow pipe shall be at least 75 mm 3 in in diameter. 5 6 3 Piping connections to drains and in overflow lines shall be designed to permit access. for inspection and cleaning of the interior of the piping. 5 6 4 The connection of the overflow pipe to the tank shall be made at a point that is at least. 150 mm 6 in below the top of the tank,5 7 Bottom Drains. Dipping or coating tanks that exceed 1900 L 500 gal capacity shall be equipped with. bottom drains arranged to drain the tank in the event of fire. Exception No 1, Bottom drains shall not be required for tanks that are equipped with automatic closing. covers meeting the requirements of Section 9 6,Exception No 2. Bottom drains shall not be required if the viscosity of the liquid at normal atmospheric. temperatures makes this impractical, 5 7 1 Bottom drains shall be both manually and automatically operable Manual operation.
shall be from a safe and accessible location, 5 7 2 Where gravity flow is impractical automatic pumps shall be provided. 5 7 3 Drains shall be trapped and shall discharge to a closed vented salvage tank see. Section 5 8 or to a safe location, 5 7 4 The diameter of the bottom drain pipe or pipes shall be sized to empty the dipping or. coating tank within 5 minutes but in no case shall the pipe diameter be less than that. indicated in Table 5 7 4,Table 5 7 4 Minimum Size of Drain Pipe. Tank Capacity Nominal Pipe Diameter,L gal mm in,1900 to 2850 500 to 750 75 3. 2851 to 3800 751 to 1000 100 4,3801 to 9500 1001 to 2500 125 5.
9501 to 15 000 2501 to 4000 150 6,15 000 4000 200 8. 5 8 Salvage Tanks, 5 8 1 Where a salvage tank is employed a pumping arrangement shall be provided for the. retrieval of the contents, 5 8 2 The salvage tank shall meet all applicable requirements of NFPA 30 Flammable and. Copyright NFPA,Combustible Liquids Code, 5 8 3 The salvage tank shall be emptied before the dipping or coating tank is refilled. 5 8 4 The capacity of the salvage tank or tanks shall be greater than the capacity of the. dipping or coating tank or tanks to which they are connected. 5 9 Conveyor Systems, 5 9 1 Conveyor systems shall be arranged to stop automatically in the event of a fire.
5 9 2 Conveyor systems shall be arranged to stop automatically if the required rate of. ventilation is not maintained See Section 7 3,5 10 Control of Liquid Temperature. 5 10 1 Where dipping or coating liquids are heated either directly or by the workpieces. being processed the requirements of 5 10 1 1 through 5 10 1 4 shall be met to prevent. excess temperature vapor accumulation and possible autoignition For the purposes of this. section excess temperature shall mean any temperature above which the ventilation required. by Section 7 3 cannot safely confine the vapors generated In no case shall this temperature. exceed the boiling point of the liquid or a temperature that is 55 C 100 F less than the. autoignition temperature of the liquid, 5 10 1 1 The dipping or coating tank shall be equipped with a listed manual reset high. temperature limit control designed to shut down the conveyor system if any and the heating. system if excess temperatures are reached, 5 10 1 2 Heating and cooling units for liquids shall be of an approved type and shall be. controlled serviced and maintained in accordance with the manufacturers instructions. 5 10 1 3 Workpieces shall not be dipped or coated if their surface temperature exceeds a. temperature that is 55 C 100 F less than the autoignition temperature of the liquid. 5 10 1 4 Heating systems shall be automatically shut down if the level of liquid in the. dipping or coating tank exceeds or falls below the manufacturers recommended operating. Chapter 6 Electrical and Other Sources of Ignition. Chapter 6 shall apply to electrical wiring and electrical utilization equipment that is used in or. on is attached to the dipping and coating equipment or is in the vicinity of the dipping and. coating equipment This chapter shall also apply to other sources of ignition. 6 2 General, 6 2 1 Dipping and coating process areas where Class I liquids are used or where Class II or. Class III liquids are used at temperatures at or above their flash points shall meet the.


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