b。 Provide indicator light showing that the exhaust system is functioning properly。

8-4 SAFETY AND HEALTH CONSIDERATIONS。  In accordance with 29 CFR

1926。403, Battery Rooms and Battery Charging, provide the following。

a。 Face shields, aprons, and rubber gloves for workmen handling acids or batteries。

b。 Facilities for quick drenching of the eyes and body, within 7。6 m (25 ft) of the work area for emergency use。 See UFC 3-420-01 for eyewash station requirements。

c。 Facilities for flushing and neutralizing spilled electrolyte, and for fire protection。

d。 Non-slip rubber insulating matting in front of all charging benches to protect personnel from electric shock and slipping hazards

e。 Warning signs, such as: “Hydrogen, Flammable Gas, No Smoking, No Open Flames。”

CHAPTER 9 PAINT SPRAY BOOTHS

9-1 FUNCTION。 Paint spray booths provide surface finishing capabilities for a wide range of parts, equipment, and vehicles。 Paint spray booth sizes range from bench type units for painting small parts, to large walk-in booths or rooms for painting vehicles, tractors or large equipment。 Design aircraft maintenance hangars in accordance with Chapter 10 of this UFC。

9-2 OPERATIONAL CONSIDERATIONS。 During paint spray operations, paint is atomized by a spray gun and then deposited on the object being painted。 Depending on the application equipment and spray method used, transfer efficiencies vary greatly。

Transfer efficiency is the amount of paint solids deposited on a surface pided by the total amount of paint sprayed, expressed as a percentage。

a。 Use equipment with a high transfer efficiency, such as electrostatic or high volume low pressure (HVLP) spray guns, to reduce overspray。 Overspray is the paint that is sprayed but not deposited on the surface being painted。 This equipment not only saves in paint cost, but also reduces volatile organic compound (VOC) emissions and maintenance requirements。

b。 Warm the paint before applying, whenever possible。 This lowers the paint viscosity enabling spray painting at a lower pressure, thereby minimizing the amount of overspray generated。 The lower viscosity also decreases the quantity of solvent used to thin the paint prior to spraying。 This results in reduced solvent consumption and VOC emissions。

9-2。1 Painting Equipment Types。  Spray-painting equipment must conform to national, state, and local emission control requirements。 One of these requirements is transfer efficiency。 Five primary types of paint spraying equipment and their typical transfer efficiencies include:

1。 Conventional air spray (25 percent transfer efficiency)。

2。 Airless spray (35 percent transfer efficiency)。

3。 Air-assisted airless spray (45 percent transfer efficiency)。

4。 Electrostatic spray (65 percent transfer efficiency)。

5。 High volume/low pressure (HVLP) spray (up to 75 percent transfer efficiency)。

9-3 DESIGN CRITERIA。 Design or procure paint spray booths in accordance with the general technical requirements in Chapter 2 of this UFC and the specific requirements in this Chapter。

9-3。1