For operators and maintenance workers at dip tanks used for painting, plating, pickling, degreasing, quenching and similar processes: ventilation and the 25% LFL limit, first aid and hygiene facilities, tank cleaning and entry, inspections, and ignition control and fire protection for flammable liquids.
Based on OSHA 29 CFR 1910.123, 1910.124 and 1910.125 · about 4 min read
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The rule applies to dip tanks containing a liquid other than water, used to clean, coat, alter the surface of or change the character of an object, and to draining or drying dipped objects. Examples: paint dipping, electroplating, pickling, quenching, tanning, degreasing, stripping, cleaning, roll, flow and curtain coating. Molten-material-only operations are not covered.
The vapor area is the space with the tank, drain boards, drying and conveying equipment, and any area where vapor exceeds 25% of the LFL.
Ventilation must keep any substance below 25% of its LFL. Where a chemical has its own health standard, exposure is controlled as that standard requires. Tank covers or floating materials may replace or supplement ventilation if they achieve the same limits.
Exhaust air is not recirculated if it poses a health hazard or exceeds 25% of the LFL.
Entering a dip tank follows the permit-required confined space entry rules, as applicable.
Employees must know the first-aid procedures for the dipping or coating hazards they face.
Where liquids may burn, irritate or harm skin: locker space to protect street clothes, an emergency shower and eyewash close to the operation (or a qualifying water hose), at least one basin with a hot-water faucet for every 10 employees who work with such liquids, first-aid supplies nearby, treatment of small cuts or rashes by a designated person, and a physician's approval before someone with a skin lesion needing treatment works in a vapor area. Chromic acid workers get periodic exams of exposed body parts, especially nostrils.
Before an employee cleans the inside of a tank: drain it, open the cleanout doors, and ventilate and clear any vapor pockets.
Inspect hoods and ductwork and check airflow at least quarterly during operation and before restart after a long shutdown. Periodically inspect all dipping and coating equipment, including covers, drains, overflow piping, and electrical and fire-extinguishing systems, and promptly correct any deficiencies.
Clean tanks of solvents and vapors before any welding, burning or open-flame work on them.
For tanks with flammable liquids (and liquids with a flashpoint of 199.4 degrees F or above when the liquid is heated as part of the operation or a heated object is placed in it):
Tanks are made of noncombustible material.
A tank with a capacity greater than 150 gallons or a liquid surface area greater than 10 square feet needs properly trapped overflow piping that discharges to a safe location. A tank that contains more than 500 gallons of liquid needs a bottom drain that will empty the tank during a fire, unless the tank has an automatic closing cover of the kind described below or the liquid is too viscous to flow or be pumped easily.
A conveyor system serving the tank shuts down automatically if there is a fire or ventilation drops below the required rate.
In the vapor area and adjacent area (any area within 20 feet of a vapor area that is not separated from it by tight partitions), wiring meets hazardous location rules and there are no flames, spark-producing devices or hot surfaces that could ignite vapors.
Portable containers used to add liquid are bonded to the tank and grounded.
Keep vapor areas free of combustible debris. Contaminated rags go in approved waste cans immediately, emptied at the end of each shift.
No smoking in the vapor area, with a No Smoking sign near each tank.
Dip tanks with a capacity of at least 150 gallons or a liquid surface area of at least 4 square feet (hardening or tempering tanks: at least 500 gallons or 25 square feet) need, for every vapor area, manual fire extinguishers suitable for flammable and combustible liquid fires and an automatic fire-extinguishing system. A cover closed by an approved automatic device may take the place of the automatic system if it can also be activated manually, is noncombustible or tin-clad with locked joints, and is kept closed when the tank is not in use.
Liquid temperature stays below its boiling point and at least 100 degrees F below its autoignition temperature.
Fact-checked against the regulation text on October 09, 2026. This certificate records completion of awareness training based on OSHA 29 CFR 1910.123, 1910.124 and 1910.125. It is not an OSHA card or license, and it is not permit-required confined space entry training. 29 CFR 1910.123 through 1910.126 contain no separate training requirement; the related employer duty is 29 CFR 1910.124(f): your employer must make sure you know the first-aid procedures that are appropriate to the dipping or coating hazards to which you are exposed. Your employer must also control your exposure as required by any subpart Z standard that covers the liquid in your tank (29 CFR 1910.124(b)(2)), and meet the entry requirements of 29 CFR 1910.146, as applicable, before anyone enters a dip tank (29 CFR 1910.124(e)).
This guide explains the rule in plain words. Always read the regulation itself and your employer's site-specific procedures.