AS NZS 4114:2020 pdf free.Spray painting booths, designated spray painting areas and paint mixing rooms.
A designated spray area shall not be used for general use but may be applied where a conventional spray
booth is not practical. A designated spray painting area may be either a three dimensional zone within
a large room where spray painting may occur or a designated area external to a room. See Appendix A
for designated spray areas.
NOTE 1 Examples of situations where designated spray painting areas exist within a room could include the painting of trains or aircraft within a much larger building. Examples of designated areas outside of a room would include the painting of bridges, structures, ships and the like.
A designated spray area may be applied when the background concentration in a room can be controlled by either artificial ventilation or the volume of the room, providing adequate dispersion of flammable vapour. In such cases only the hazard local to the workpiece or spray nozzle may need to be considered.
The designated spray painting area may be considered as the area around the spray nozzle or object being sprayed until adequate dispersion of the spray or associated vapour is achieved to less than 25 % of the LEL. This distance should consider the following factors:
The relative size of the object to any room where the spray activity occurs. (This would not be applicable to outdoor areas.)
Mechanical ventilation of the area.
Variances in spray activities considering the range of objects that may be brought into the room.
NOTE 2 Mechanical ventilation may be needed to provide for some air movement to maintain air quality and control any background concentration but may not need to meet the normal requirements for a spray booth.
Designated spray painting areas within a room are typically considered as — for very large spaces, within 2 m of the workpiece or the spray nozzle in any location of use;
for spaces where the items being sprayed are more than 3 m from walls and ceiling, the designated spray area may be up to 0.5 m from the walls and 0.5 m below the ceiling; or otherwise assessed by a competent person considering the dispersion details for the application and recorded in the user manual, i.e. classified as hazardous areas according to
AS/NZS 60079.10.1.
Designated spray areas in unenclosed spaces are typically considered as being within 2 m of the workpiece or the spray nozzle in any location of use.
Designated spray areas may also be enclosed by a temporary membrane which is typically applied for containment of the products from spraying operations and to limit environmental impacts.
1.5 Documentation
It is necessary to ensure that any installation conforms to the appropriate certification documents as well as with this Standard and any other requirements specific to the plant at which the installation takes place.
Safety, operational and maintenance instructions shall be supplied for the spray painting booth, mixing room and designated spray areas.AS NZS 4114 pdf download.