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Dip Tanks Containing Flammable or Combustible Liquids checklist

The professional inspection solution

You can conduct this checklist for free on the Checkbuster platform. You can use a lap-top, PC or the free inspection App

General Requirements

  • The ventilation does provided to the vapor area in the vicinity of a dip tank keep the airborne concentration of any substance below 25% of its lower flammable limit.
  • Exhaust ventilation systems are well constructed and in good working order.
  • Dip tank operations are controlled so exposures are maintained within required limits.
  • When two or more dip tank operations are ventilated by a common exhaust duct, care is taken to ensure that the mixture of contaminants generated does not present a fire, explosion, or chemical reaction hazard.
  • Instructions are given to all persons who work on or around dip tanks about hazards and applicable first aid procedures.
  • Protective equipment (including personal protective equipment for eyes, face, head, and extremities) protective clothing, and respiratory devices are provided to all persons who use dip tanks.
  • Deluge showers and eye wash stations are provided near dip tank operations.
  • Washing facilities are provided nearby for users of dip tanks.
  • Locker space or an equivalent clothing storage facility is available to prevent contamination of street clothing.
  • First aid supplies are readily available and they are specific to the hazards associated with the dip tanks being used.


  • In educational buildings, dip tanks are used only in a room designed for the purpose, protected with an approved automatic fire-suppression system, and separated vertically and horizontally from other areas as required by the building code.
  • Dip tanks, including any drainboards, are constructed of noncombustible materials.
  • For dip tanks over 150 gallons in capacity or 10 square feet in liquid surface area, a properly trapped overflow pipe does lead to a safe location outside the building.
  • The overflow pipe is at least 3 inches in diameter.
  • All piping connections on the dip tank are easily accessible for inspection and cleaning.
  • The bottom of the overflow connection is at least 6 inches below the top of the dip tank.
  • If the dip tank is over 500 gallons in capacity, it is equipped with a bottom drain.
  • The required bottom drain will operate during a fire.
  • The required bottom drain is properly trapped and discharged to a safe location outside.
  • Required bottom drains are automatically and manually arranged to drain quickly in the event of fire unless the viscosity of the liquid at normal atmospheric temperature makes this impractical.
  • Manual operation of required bottom drains is available at a safely accessible location.
  • If required bottom drains do not operate by gravity flow, an automatic pump is provided.
  • Open flames, spark-production devices, or heated surfaces are hot enough to ignite vapors absent from the vapor area.
  • In each vapor area and any adjacent area, all electrical wiring and equipment does conform to applicable hazardous (classified) area requirements.
  • Any portable containers used to add liquid to the tank electrically are bonded to the tank and positively grounded to prevent static electrical sparks or arcs.
  • Heating systems used in drying operations are installed in accordance with NFPA 86A-1969 and provided with mechanical ventilation before and during operation.
  • These heating systems do shut down automatically if any ventilating fan fails to maintain adequate ventilation.

Operations and Maintenance

  • All vapor areas are free of combustible debris and as free as possible of combustible stock.
  • The contents of these waste cans are properly disposed of at the end of each shift.
  • The dip tank facility and all its components are inspected periodically.
  • Defects are promptly corrected.
  • “No Smoking” signs in large letters are on a contrasting color background conspicuously posted in the vicinity of each dip tank.

Fire Extinguishers

  • Suitable manual and automatic fire extinguishers are available for areas in the vicinity of dip tanks.

Dip Tank Covers

  • If dip tank covers are arranged to close automatically in the event of a fire, they are actuated by approved automatic devices and arranged for manual actuation and operation.
  • Dip tank covers are constructed of substantial noncombustible material or of the tin-clad type with enclosing metal applied with locked joints.
  • Covers are kept closed when tanks are not used.