Temporary electrostatic spraying
and powder coating locations which are not required to
have a permit under Section 105.7 shall be regulated under
special permit from the Chief pursuant to Section 105.8 of
this article.
The use of flammable
solvents for cleaning operations is prohibited. Solvents
for cleaning operations shall have flash points above
100°F (38°C). All cleaning operations inside the spray
booth shall be conducted with the ventilation system in
operation.
Original
closed containers, approved portable tanks, safety
cans, or properly arranged and constructed piping systems
shall be used for bringing Class I, II and IIIA liquids into
the spray area. Open or glass containers are prohibited.
No person shall make any alterations or
repairs thereon or thereto, nor permit them to be made,
before any such rooms, booths or tunnels and all equipment,
ducts and pipes in connection therewith have been
thoroughly cleaned of residue and made gas and vapor
free.
All combustible flooring
under and adjacent to spray booths or spray tunnels
shall be protected with a covering of
noncombustible material so installed as to prevent
the combustible flooring from coming into contact
with the flammable liquids used in the spraying process,
and of such a nature as to facilitate the safe
cleaning and removal of residues.
No
heating device shall be located, installed, maintained or
used in any spray room. For comfort of persons working
within the spray room or spray booth, heating appliances
of indirect type may be installed on the outside of such
booths or rooms for the purpose of introducing heat inside
thereof, provided the temperature does not exceed 120°F
(49°C) at the warm air inlet to the booth or tunnel and that
location and arrangement of the heating appliance and the
method of heat introduction into said room is first
approved.
Exhaust ducts shall be in accordance
with Sections 2404.7.9.1 through 2404.7.9.6.
Every duct or pipe shall be
constructed of galvanized metal sheets in accordance
with the provisions of Table 2404.7.9.1.
| Duct Cross-Sectional Dimension in Inches | Gauge of Duct Metal |
|---|---|
| Up to 8 | 24 |
| Over 8 to 18 | 22 |
| Over 18 to 30 | 20 |
| Over 30 | 18 |
All seams in any duct or pipe shall
be made tight by crimping or other equally efficient
manner without the use of solder or combustible materials,
and all sections shall be securely joined.
Exhaust ducts shall have a
clearance from unprotected combustible construction
or other combustible material of not less than 18 inches
(455 mm). This distance may be reduced if protection
is provided for all combustible surfaces within 18
inches (455 mm) according to the following schedule:
- 28 gauge sheet metal on 1/4 inch (305 mm) insulating millboard 12 inches
- 28 gauge sheet metal on 1/8 inch insulating millboard spaced out 1 inch (254 mm) on noncombustible spacers 9 inches (230 mm).
- 22 gauge sheet metal on 1 inch rockwool bats reinforced with wire mesh or the equivalent 3 inches (76 mm).
- Any other approved material of equal or greater fire-resistance.
Ducts or pipes may be separated from combustible
material by a ventilated collar which provides a clear
air space equal to one-half the diameter of the duct but
in no event shall such collar provide less than 3 inch
(76 mm) air space, and such collar shall extend not less
than 12 inches (305 mm) above and below such combustible
material.
Every branch duct or pipe
shall be connected to the main duct or pipe at an angle
not exceeding 45 degrees measured from the centerline
of the main duct or pipe. Every bend, turn or elbow in
any duct or pipe shall be constructed so as not to reduce
the cross sectional area of the duct or pipe. Every
change in cross section of any such duct or pipe shall be
by means of a transition fitting having a slope or taper
of not more than 1 inch for each 4 inches (100 mm) in
length of the said duct or pipe.
Exhaust ducts shall be
designed to provide sufficient air transport velocity to
prevent the over-spray from settling in the duct.
Dip tanks exceeding 20 gallon
(76 L) capacity shall not be used or maintained on any combustible
floor. Dip tanks of 20 gallon (76 L) capacity or less
shall not be used or maintained on combustible flooring
unless the floor under such tanks, and for a distance of 5 feet
(1525 mm) on all sides of dip tanks, drain boards, and objects
which have been dipped is protected with a covering of noncombustible
material in such a manner as to prevent the floor
from becoming saturated or covered with flammable or combustible
liquids used in the dipping process.
Sources of ignition in resin application areas shall comply with Section 2403.2.