NFPA Misc.

 

14.1 Vehicle Undercoating and Body Lining.

14.1.1 Spray undercoating or spray body lining of vehicles that is conducted in an area that has adequate natural or mechanical ventilation shall be exempt from the provisions of this standard, if all of the requirements of 14.1.1.1 through 14.1.1.4 are met.

14.1.1.1 There shall be no open flames or spark-producing equipment within 6100 mm (20 ft) of the spray operation while the spray operation is being conducted.

14.1.1.2 There shall be no drying, curing, or fusion apparatus in use within 6100 mm (20 ft) of the spray operation while the spray operation is being conducted.

14.1.1.3 Any solvent used for cleaning procedures shall have a flash point not less than 37.8°C (100°F).

14.1.1.4 The coating or lining materials used shall meet one of the following criteria:

(1) Be no more hazardous than UL Class 30-40, when tested in accordance with UL 340, Test for Comparative Flammability of Liquids
(2) Not contain any solvent or component that has a flash point below 37.8°C (100°F)
(3) Consist only of Class IIIB liquids and not include any organic peroxide catalyst

14.1.2 Noncomplying Undercoating Operations.

Spray undercoating operations that do not meet the requirements of Section 14.1 shall meet all applicable requirements of this standard pertaining to spray finishing operations.

14.2 Preparation Workstations.

If spray finishing operations are performed at or in a preparation workstation, the preparation workstation shall be considered an unenclosed spray area and shall meet all requirements of an unenclosed spray area.

Exception: A preparation workstation that is designed and operated in accordance with Section 14.3 shall be considered a limited finishing workstation and not an unenclosed spray area.

14.3 Limited Finishing Workstations.

A limited finishing workstation shall be designed and operated in accordance with the requirements of 14.3.1 through 14.3.9.

14.3.1 A limited finishing workstation shall be designed and constructed to have all of the following:

(1) A dedicated make-up air supply and air supply plenum
(2) Curtains or partitions that are noncombustible or limited combustible, as defined in NFPA 220, or that can successfully pass Test Method 2 of NFPA 701
(3) A dedicated mechanical exhaust and filtration system
(4) An approved automatic extinguishing system that meets the requirements of Chapter 9

14.3.2 The amount of material sprayed in a limited finishing workstation shall not exceed 3.8 L (1 gal) in any 8-hour period.

14.3.3 The limited finishing workstation shall meet all applicable requirements of Chapter 4 through Chapter 10 and Chapter 18 of this standard.

14.3.4 Curtains or partitions shall be fully closed during any spray application operations.

14.3.5 The area inside the curtains or partitions shall be considered a Class I, Division 1; Class I, Zone 1; or Class II, Division 1 hazardous (classified) location, as defined by NFPA 70.

14.3.5.1 A Class I, Division 2; Class I, Zone 2; or Class II, Division 2 hazardous (classified) location, as applicable, shall extend horizontally and vertically beyond the volume enclosed by the outside surface of the curtains or partitions as follows:

(1) 1525 mm (5 ft) horizontally and 915 mm (3 ft) vertically, as shown in Figure 14.3.5.1(a), if the spray application equipment is interlocked with the exhaust ventilation system
(2) 3050 mm (10 ft) horizontally and 915 mm (3 ft) vertically, as shown in Figure 14.3.5.1(b), if the spray application equipment is not interlocked with the exhaust ventilation system

FIGURE 14.3.5.1(a) Class I, Division 2; Class I, Zone 2; or Class II, Division 2 Locations Adjacent to a Limited Finishing Workstation with Exhaust Ventilation Interlocked with Spray Equipment.

FIGURE 14.3.5.1(b) Class I, Division 2; Class I, Zone 2; or Class II, Division 2 Locations Adjacent to a Limited Finishing Workstation with Exhaust Ventilation Not Interlocked with Spray Equipment.

14.3.5.2 For the purposes of this subsection, interlocked shall mean that the spray application equipment cannot be operated unless the exhaust ventilation system is operating and functioning properly and spray application is automatically stopped if the exhaust ventilation system fails.

14.3.6 Any limited finishing workstation used for spray application operations shall not be used for any operation that is capable of producing sparks or particles of hot metal or for operations that involve open flames or electrical utilization equipment capable of producingsparks or particles of hot metal.

14.3.7 Drying, curing, or fusion apparatus shall be permitted to be used in a limited finishing workstation if they meet the requirements of Chapter 13.

14.3.8 Portable spot-drying, curing, or fusion apparatus shall be permitted to be used in a limited finishing workstation, provided that it is not located within the hazardous (classified) location defined in 14.3.5 when spray application operations are being conducted.

14.3.9 Recirculation of exhaust air shall be permitted only if all provisions of Section 7.5 are met.