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FHM TRAINING TOOLS

FHM TRAINING TOOLS. This training presentation is part of FHM’s commitment to creating and keeping safe workplaces. Be sure to check out all the training programs that are specific to your industry. Dipping And Coating Operations 1910.122 - 126, Subpart H. Summary.

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FHM TRAINING TOOLS

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  1. FHM TRAINING TOOLS This training presentation is part of FHM’s commitment to creating and keeping safe workplaces. Be sure to check out all the training programs that are specific to your industry.

  2. Dipping And Coating Operations1910.122 - 126, Subpart H

  3. Summary • Rule developed to accomplish • Rewrite former standards in plain language • Consolidate former requirements • Increase compliance options

  4. Coverage and Definitions -1910.123

  5. Does This Rule Apply to Me? • When a dip tank contains a liquid other than water • When you use a liquid or vapors to: • Clean or coat • Alter the surface • Change the characteristic • Draining or drying an object, dipped or coated

  6. What Operations Are Covered? • Paint dipping • Electroplating • Pickling • Quenching • Tanning • Degreasing

  7. Operations Covered (Continued) • Stripping • Cleaning • Roll coating • Flow coating • Curtain coating

  8. What Operations Are Not Covered? • An operation that only uses a molten material • Alloy • Salt

  9. How Are Terms Defined? • Adjacent area • Any area within 20 feet of a vapor area that is not separated by tight partitions • Approved • Designated equipment - listed/approved by a nationally recognized testing laboratory • Auto ignition temperature • The minimum temperature required to cause self-sustained combustion, independent of any other source of heat

  10. Terms Defined (Continued) • Combustible liquid • A liquid with a flash point of 100 deg.F or > • Dip tank • A container holding a liquid other than water and used for dipping or coating • An object may be immersed (or partially immersed) or it may be suspended in a vapor area • Flammable liquid • A liquid with a flashpoint < 100 deg.F

  11. Terms Defined (Continued) • Flashpoint • The minimum temperature where a liquid gives off a vapor in sufficient concentration to ignite • Lower flammable limit (LFL) • The lowest concentration of a material that will propagate a flame • Expressed as a % by volume of the material in air (or other oxidant)

  12. Terms Defined (Continued) • Vapor area • Any tank, including drain boards, drying or conveying equipment, and any surrounding area where the vapor concentration > 25% of the LFL • You • The employer, as defined by the occupational safety and health act of 1970

  13. General Requirements -1910.124

  14. What Construction Requirements Apply to Dip Tanks? • Any container that must be strong enough to withstand any expected load

  15. What Ventilation Requirements Apply to Vapor Areas? • Keep airborne concentration < 25% of its LFL • Meet levels specified Subpart Z • Use of tank covers or floating materials

  16. When You Use Mechanical Ventilation? • Must conform with standards incorporated by reference: • ANSI • NFPA • ACGIH • Draw the flow of air into a hood or exhaust duct

  17. Mechanical Ventilation (Continued) • Tanks must have an independent exhaust system unless the combination of substances being removed will not cause a: • Fire • Explosion • Chemical reaction

  18. What Requirements Must I Follow to Re-circulate Exhaust Air? • Can not recirculate exhaust air when substance poses a health hazard to employees • > 25% the LFL

  19. Recirculate Exhaust Air (Continued) • Exhausted air re-circulated using flammable or combustible liquids is: • Free of any solid particulate • Monitored by approved equipment • Sounds an alarm, automatically shuts down when the vapor concentration > 25% the LFL

  20. What Must I Do When I Use an Exhaust Hood? • Provide area with a volume of outside air that is at least 90 % of the volume of the exhaust air • Outside air supply does not damage exhaust hoods

  21. What Requirements Must I Follow When an Employee Enters a Dip Tank? • Meet the entry requirements for permit-required confined spaces

  22. What First-aid Procedures Must My Employees Know? The first-aid procedures that are appropriate for the operation

  23. What Hygiene Facilities Must I Provide? • Lockers or other storage space to prevent contamination of employee's street clothes • Emergency shower and eye-wash station close to the operation • Can use water hose at least 4’ and at least 3/4” thick, a quick-opening valve, and a pressure of 25 lbs. psi or < • At least one basin with a hot-water faucet for every 10 employees

  24. What Treatment and First Aid Must I Provide? • A physician's approval before an employee with a sore, burn, or other skin lesion that requires medical treatment works in a vapor area • Treatment by a properly designated person of any small skin abrasion, cut, rash, or open sore • Appropriate first-aid supplies located near the operation • Employees who work with chromic acid, periodic examinations of exposed body parts, especially their nostrils

  25. What Must I Do Before an Employee Cleans a Dip Tank? • Drain the tank, open the cleanout doors • Ventilate and clear any pockets where hazardous vapors may have accumulated

  26. What Must I Do to Inspect and Maintain My Dipping or Coating Operation? • Inspect hoods and ductwork of ventilation system for corrosion or damage: • At least quarterly during operation • Prior to operation after a prolonged shutdown • Ensure that the airflow is adequate: • At least quarterly during operation • Prior to operation after a prolonged shutdown

  27. Inspect and Maintain (Continued) • Periodically inspect all equipment • Covers • Drains • Overflow piping • Electrical • Fire-extinguishing systems • Promptly correct any deficiencies

  28. Inspect and Maintain (Continued) • Provide mechanical ventilation or respirators to protect employees from exposure to toxic substances during • Welding • Burning • Open-flame work • Clean solvents and vapors before permitting welding, burning, or open-flames

  29. Additional Requirements for Flammable or Combustible Liquids - 1910.125

  30. Flammable or Combustible Liquids • Must comply 1910.123, 124, 125, and 126 • Must comply if: • Flashpoint of flammable or combustible liquid is 200 deg. F or > • Liquid is heated as part of the operation • Heated object is placed in the liquid

  31. What Type of Construction Material Must Be Used in Making My Dip Tank? • Noncombustible material

  32. When Must I Provide Overflow Piping? • Properly trapped overflow piping that discharges to a safe location for: • A capacity > 150 gallons • A liquid surface area > 10 feet

  33. Overflow Piping (Continued) • Overflow piping is at least 3” in diameter and has sufficient capacity to prevent the tank from overflowing • Piping connections on drains and overflow pipes allow ready access to the interior of the pipe for inspection and cleaning • Bottom of the overflow connection is at least 6” below the top of the tank

  34. When Must I Provide a Bottom Drain? • For tanks that contain > 500 gallons of liquid, unless: • The tank is equipped with an automatic closing cover • The viscosity of the liquid at normal atmospheric temperature does not allow the liquid to flow or be pumped easily

  35. Bottom Drain (Continued) • Must ensure that the bottom drain: • Will empty the dip tank during a fire • Has pipes that permit the contents to be removed in 5 minutes • Is properly trapped • Discharges to a safe location

  36. Bottom Drain (Continued) • Must be capable of manual and automatic operation • Manual operations must be from a safe and accessible location • Must ensure that automatic pumps are used when gravity flow from the bottom drain is impractical

  37. When Must My Conveyor System Shut Down Automatically? • If a conveyor system is used, the system must shut down automatically: • If there is a fire • If the ventilation rate drops below requirements

  38. What Ignition and Fuel Sources Must Be Controlled? • In each vapor area and any adjacent area: • All electrical wiring and equipment conform requirements of Subpart S • Except as permitted in 1910.126 • There are no flames, spark-producing devices, or other surfaces that are hot enough to ignite vapors

  39. Ignition and Fuel Sources (Continued) • Portable container used to add liquid to the tank is electrically bonded and grounded • Heating systems used in a drying operation that could cause ignition: • Is installed in accordance with NFPA • Has adequate mechanical ventilation that operates before and during drying operation

  40. Ignition and Fuel Sources (Continued) • Shuts down automatically if any ventilating fan fails to maintain adequate ventilation • All vapor areas are free of combustible debris • Rags and other contaminated material placed in approved waste cans immediately after use • Waste can contents are properly disposed of at the end of each shift • Post "no smoking" sign near each tank

  41. What Fire Protection Must I Provide? • Required for: • Any tank with a capacity of at least 150 gallons or a liquid surface area of at least 4’ • Any hardening or tempering tank with a capacity of at least 500 gallons or a liquid surface area of at least 25’

  42. Fire Protection (Continued) • For vapor areas, you must provide: • Manual fire extinguishers for flammable and combustible liquid fires • Automatic fire-extinguishing system, Subpart L

  43. Fire Protection (Continued) • May substitute a cover that is closed by an approved automatic device for the automatic fire-extinguishing system if the cover: • Can also be activated manually • Is noncombustible or tin-clad, with the enclosing metal applied with locked joints • Is kept closed when the tank is not in use

  44. To What Temperature May I Heat a Liquid in a Dip Tank? • Must maintain the temperature of the liquid: • Below the liquid's boiling point • At least 100 deg. F below the liquid's auto ignition temperature

  45. Additional Requirements for Special Dipping and Coating Operations - 1910.126 • In addition to the requirements in 1910.123 -125, must comply with any requirement that applies to your operation

  46. What Additional Requirements Apply to Hardening or Tempering Tanks? • Must ensure that hardening or tempering tanks: • Are located as far as practicable from furnaces • Are on noncombustible flooring • Have noncombustible hoods and vents for venting to the outside • Vent ducts must be treated as flues and kept away from combustible materials, particularly roofs

  47. Hardening or Tempering (Continued) • Must equip each tank with an alarm that will sound if the temperature of the liquid comes within 50 deg. F of its flashpoint (the alarm set point) • When practicable, provide each tank with a limit switch to shut down the conveyor supplying work to the tank

  48. Hardening or Tempering (Continued) • If the temperature of the liquid can exceed the alarm set point, equip the tank with a circulating cooling system • If the tank has a bottom drain, it may be combined with the oil-circulating system • Must not use air under pressure when filling the tank or agitate liquid

  49. What Additional Requirements Apply to Flow Coating? • Must use a direct low-pressure pumping system or a 10-gallon or < gravity tank to supply the paint for flow coating • In case of fire, an approved heat-actuated device must shut down the pumping system • Must ensure that the piping is substantial and rigidly supported

  50. What Additional Requirements Apply to Roll Coating, Roll Spreading, or Impregnating? • When using a flammable or combustible liquid with a flashpoint < 140 deg. F, prevent static electricity by: • Bonding and grounding all metallic parts (including rotating parts) • Installing static collectors • Maintaining a conductive atmosphere (for example, one with a high relative humidity)

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