29 CFR § 1910.125 - Additional requirements for dipping and coating operations that use flammable liquids or liquids with flashpoints greater than 199.4 °F (93 °C).
|You must also comply with this section if:||And:|
|• The flashpoint of the liquid is 199.4 °F (93 °C) or above||• The liquid is heated as part of the operation; or
• A heated object is placed in the liquid.
(i) A capacity greater than 150 gallons (568 L); or
(ii) A liquid surface area greater than 10 feet 2 (0.95 m 2).
(2) You must also ensure that:
(ii) Piping connections on drains and overflow pipes allow ready access to the interior of the pipe for inspection and cleaning; and
(ii) The viscosity of the liquid at normal atmospheric temperature does not allow the liquid to flow or be pumped easily.
(2) You must ensure that the bottom drain required by this section:
(i) Will empty the dip tank during a fire;
(ii) Is properly trapped;
(iv) Discharges to a safe location.
(3) Any bottom drain you provide must be capable of manual and automatic operation, and manual operation must be from a safe and accessible location.
(1) If there is a fire; or
(i) All electrical wiring and equipment conform to the applicable hazardous (classified)-area requirements of subpart S of this part (except as specifically permitted in paragraph (g) of § 1910.126); and
(ii) There are no flames, spark-producing devices, or other surfaces that are hot enough to ignite vapors.
(ii) Has adequate mechanical ventilation that operates before and during the drying operation; and
(iii) Shuts down automatically if any ventilating fan fails to maintain adequate ventilation.
(4) You also must ensure that:
(i) All vapor areas are free of combustible debris and as free as practicable of combustible stock;
(iii) Waste can contents are properly disposed of at the end of each shift.
(f) What fire protection must I provide? (1) You must provide the fire protection required by this paragraph (f) for:
(i) Any dip tank having a capacity of at least 150 gallons (568 L) or a liquid surface area of at least 4 feet 2 (0.38 m 1); and
(ii) Any hardening or tempering tank having a capacity of at least 500 gallons (1893 L) or a liquid surface area of at least 25 feet 2 (2.37 m 2).
(i) Manual fire extinguishers that are suitable for flammable and combustible liquid fires and that conform to the requirements of § 1910.157; and
(ii) An automatic fire-extinguishing system that conforms to the requirements of subpart L of this part.
(i) Can also be activated manually;
(ii) Is noncombustible or tin-clad, with the enclosing metal applied with locked joints; and
(g) To what temperature may I heat a liquid in a dip tank? You must maintain the temperature of the liquid in a dip tank:
(1) Below the liquid's boiling point; and
(2) At least 100 °F (37.8 °C) below the liquid's autoignition temperature.