// CODE SNIPPET
Section 1505 Dip-Tank Operations
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In Group A, I and R occupancies, dip-tank operations shall be conducted in a room designed for that purpose, protected throughout by a sprinkler system, and separated vertically and horizontally from other areas by construction having a fire resistance rating of not less than 2 hours, in accordance with the construction codes, including the Building Code.
Dip tanks shall be designed and installed in compliance with the requirements of FC 1505.3.1 through 1505.3.6.
Except as otherwise provided in FC1505.4 with respect to hardening and tempering tanks, dip tanks shall be constructed in accordance with this section, and NFPA 34. Dip tanks, including drain boards, shall be constructed of noncombustible material and their supports shall be sturdily constructed of metal, reinforced concrete or masonry.
Dip tanks greater than 500 gallons (1893 L) in liquid capacity shall be equipped with bottom drains that are arranged to automatically and manually drain the tank quickly in the event of a fire unless the viscosity of the liquid at normal atmospheric temperature makes this impractical. Manual operation shall be from a safe, accessible location. Where gravity flow is not practicable, automatic pumps shall be provided. Such drains shall be provided with traps and shall discharge to a closed, vented salvage tank or other approved location.
Exception: Dip tanks containing Class IIIB combustible liquids where the liquids are not heated above room temperature, and the process area is protected throughout by a sprinkler system.
Exception: Dip tanks containing Class IIIB combustible liquids where the liquids are not heated above room temperature, and the process area is protected throughout by a sprinkler system.
Chain or wire rope shall be utilized for cover supports or operating mechanisms.
Dip-tank operations shall be protected in compliance with the requirements of FC 1505.3.4.1 and 1505.3.4.2.
A fire extinguishing system shall be provided for the following dip tanks unless such dip tanks are provided with a dip tank cover in accordance with FC1505.3.3:
- Dip tanks less than 150 gallons (568 L) in capacity or 10 square feet (0.93 m2) in liquid surface area.
- Dip tanks containing a liquid with a flash point below 110°F (43°C), used in such manner that the liquid temperature could equal or be greater than its flash point from artificial or natural causes, and having both a capacity of more than 10 gallons (37.9 L) and a liquid surface area exceeding 4 square feet (0.37 m2).
Dip tanks with a capacity of 150 gallons (568 L) or more, or a liquid surface area of 10 square feet (0.93 m2) or more shall be protected by a fire extinguishing system. Such fire extinguishing system shall be designed in accordance with NFPA 34.
Mechanical ventilation of flammable vapor areas shall be provided in accordance with Chapter 5 of the Mechanical Code.
Hardening and tempering tanks shall be constructed in accordance with FC 1505.3.1, 1505.3.1.1, 1505.3.1.2, 1505.3.2 and 1505.3.5.
Hardening and tempering tanks shall be provided with a noncombustible hood and vent or other approved ventilation system that terminates outdoors. Such exhaust hood and vent shall serve to provide a path for heat and flames in the event of a fire in the tank. Such vent ducts shall be designed as flues, and clearances shall be maintained from combustible materials to minimize their ignition risk.
Hardening and tempering tanks with a capacity exceeding 500 gallons (1893 L) or a liquid surface area exceeding 25 square feet (2.3 m2) shall be protected by a fire extinguishing system.
Hardening and tempering tanks shall be equipped with a high-temperature limit switch arranged to sound an alarm when the temperature of the quenching medium reaches 50°F (10°C) below its flash point.
Facilities in which dipping operations are conducted shall be operated and maintained in compliance with the requirements of this section.
Protection against sources of ignition shall be provided in accordance with FC1503.2.
Dip tank rooms and areas shall be provided with portable fire extinguishers complying with the requirements of FC906 and rated for flammable and combustible liquid fires in extra (high) hazard environments.
Flow-coating operations shall be conducted in compliance with the design, installation, operation and maintenance requirements for dip tanks. For such purposes, the sump and any areas on which paint flows shall be considered to be the area of a dip tank. Finishing products shall be supplied by a gravity tank not exceeding 10 gallons (37.9 L) in capacity or by direct low-pressure pumps arranged to shut down automatically in case of fire by means of approved heat-activated devices.
Roll-coating operations shall comply with the requirements of FC1505.6. In roll-coating operations utilizing flammable or combustible liquids, sparks from static electricity shall be prevented by electrically bonding and grounding all metallic rotating and other parts of machinery and equipment and by the installation of static collectors or by maintaining a conductive atmosphere such as a high relative humidity.
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