NFPA Storage

 

8.1* General.

Storage, handling, and mixing of flammable and combustible liquids shall meet all the applicable requirements of NFPA 30. Storage, handling, and mixing of flammable and combustible liquids at process areas shall also meet the requirements of this chapter.

8.2 Storage in Process Areas.

8.2.1 There shall be not more than three approved flammable liquid storage cabinets in any single process area without the approval of the authority having jurisdiction. Storage cabinets shall be listed or shall be designed and constructed to meet the requirements of NFPA 30. Any single cabinet shall contain not more than 454 L (120 gal) of Class I, Class II, or Class IIIA liquids, of which not more than 227 L (60 gal) shall be Class I and Class II liquids.

8.2.2 The quantity of liquid located in the vicinity of spraying operations, but outside of a storage cabinet; an inside storage room; a cut-off room or attached building; or other specific process area that is cut off by at least a 2-hour fire-rated separation from the spraying operations, shall not exceed the quantity given in either (1) or (2), whichever is greater:

(1) A supply for one day
(2) 95 L (25 gal) of Class IA liquids in containers, plus 454 L (120 gal) of Class IB, Class IC, Class II, or Class III liquids in containers, plus 2 portable tanks each not exceeding 2500 L (660 gal) of Class IB, Class IC, Class II, or Class IIIA liquids, plus 20 portable tanks each not exceeding 2500 L (660 gal) of Class IIIB liquids

8.2.3 The quantity of flammable and combustible liquids located in a spray area or in a mixing room adjacent to a spray area shall meet the requirements of Section 8.3.

8.3 Mixing.

8.3.1 Dispensing or transfer of liquids from containers, mixing of liquids, and filling of containers, including portable mixing tanks and “pressure pots,” shall be done only in a mixing room or in a spray area.

8.3.2 Mixing rooms shall meet all of the following requirements:

(1) The mixing room shall meet the construction requirements of Section 5.1.
(2) The area of the mixing room shall not exceed 14 m2 (150 ft2).
(3) The mixing room shall be designed to contain a spill of the contents in the room.
(4) The mixing room or a spray area used for mixing and dispensing operations shall be provided with continuous mechanical ventilation capable of providing not less than 0.3 m3 per minute of air movement per m2 of floor area (1 ft3/min/ft2) or 4 m3/min (150 ft3/min), whichever is greater. The ventilation system shall be in operation at all times.
(5) Dispensing and mixing rooms shall be classified, for purposes of electrical area classification, the same as enclosed spray booths, in accordance with 6.5.4.
(6) The mixing room shall be provided with an approved automatic fire protection system that meets all applicable requirements of Chapter 9.
(7) The mixing room shall be provided with portable fire extinguishers located in accordance with NFPA 10.
Exception: See 8.3.6.

8.3.3 The amount of liquid permitted in a single spray area shall not exceed 227 L (60 gal).

8.3.4 Where a separate mixing room is provided and the mixing room is located adjacent to or within 1830 mm (6 ft) of an adjacent spray area or areas, as shown in Figure 8.3.4(a) and Figure 8.3.4(b), the combined quantities of liquids located in the spray areas and the mixing room shall not exceed 454 L (120 gal).

FIGURE 8.3.4(a) Mixing Room Within 1830 mm (6 ft) of Spray Area, Including Maximum Volume of Liquid Allowed.

FIGURE 8.3.4(b) Mixing Room Within 1830 mm (6 ft) of Spray Area and with Direct Entry to Spray Area, Including Maximum Volume of Liquid Allowed.

Exception: See 8.3.6

8.3.5 Where a separate mixing room is provided and the mixing room is located 1830 mm (6ft) or more from an adjacent spray area or areas, the quantity of liquid permitted in the mixing room shall not exceed 80 L/m2 (2 gal/ft2), up to a maximum of 1135 L (300 gal), as shown in Figure 8.3.5.

FIGURE 8.3.5 Mixing Room 1830 mm (6 ft) or More from Spray Area, Including Maximum Volume of Liquid Allowed.

Exception: See 8.3.6

8.3.6 Where the quantities of liquids required or the floor area necessary to provide a suitable mixing room exceeds the limits specified in 8.3.2 through 8.3.5, the mixing room shall meet all applicable requirements of NFPA 30.

8.4 Distribution Systems — Piping.

8.4.1* Piping systems that convey flammable or combustible liquids between storage tanks, mixing rooms (paint kitchens), and spray areas shall be of steel or other material having comparable properties of resistance to heat and physical damage. Piping systems shall be properly bonded and grounded.

8.4.2* Piping systems within the spray area shall be of steel or material having comparable heat and physical resistance where possible. Where tubing or hose is used, a shutoff valve shall be provided on the steel pipe at the connection.

8.4.3* Tubing or hose shall be inspected and replaced as necessary. Replacement tubing or hose shall be that recommended by the equipment manufacturer.

8.4.4 Where a pump is used to supply the liquid used in the spray application process, piping, tubing, hose, and other accessories shall be designed to withstand the maximum working pressure of the pump, or means shall be provided to limit the discharge pressure of the pump.

8.4.5* Where a pump is used to supply the liquid used in the spray application process, an automatic means shall be provided to shut off the supply of liquid in event of fire. When pressurized tanks larger than 19 L (5 gal) are used to supply the liquid used in the sprayapplication process, an automatic means shall be provided to shut off liquid flow at the tank outlet in the event of fire.

8.4.6 All pressure tubing, hose, and couplings shall be inspected at regular intervals. With the hose extended, the hose and couplings shall be tested using the “in-service maximum operating pressure.” Any hose showing material deteriorations, signs of leakage, or weakness in its carcass or at the couplings shall be replaced.

8.5 Distribution Systems — General.

8.5.1 Liquids shall be transported by means of closed containers, approved safety cans, or approved portable tanks, or shall be transferred by means of a piping system. Open containers shall not be used for moving or storing liquids.

8.5.2* Wherever liquids are transferred from one container to another, both containers shall be effectively bonded and grounded to dissipate static electricity.

8.5.3 Containers that supply spray nozzles shall be of the closed type or shall be provided with metal covers that are kept closed. Containers that do not rest on the floor shall have supports or shall be suspended by wire cables. Containers that supply spray nozzles by gravity flow shall not exceed 38 L (10 gal) capacity.

8.5.4 Original shipping containers shall not be subjected to air pressure for supplying spray nozzles.

8.5.5 Containers that are pressurized to supply spray nozzles, air storage tanks, and coolers shall comply with all applicable requirements of the ASME Boiler and Pressure Vessel Code, Section VIII, for construction, tests, and maintenance.
Exception: The following do not need to meet this requirement.

(1) Pressure containers less than 150 mm (6 in.) in diameter
(2) Pressure containers that operate at less than a gauge pressure of 1.03 kPa (15 psi)
(3) Siphon-type spray cups

8.5.6 If a heater is used to heat the liquid being sprayed, it shall be low-pressure steam, low-pressure hot water, or electric. If electric, it shall be approved and listed for the specific location in which it is used. (See Chapter 6.) Heaters shall not be located in spray booths or other locations subject to the accumulation of deposits of combustible residue. Agitators, if used, shall be driven by compressed air, water, low-pressure steam, or electricity. If powered by an electric motor, the motor shall meet the requirements of Chapter 6.