b. Spray Gun Application. Hose of adequate inside
drop in pressure occurs whenever compressed air is
transmitted. Table 14-1 Indicates the air pressure in
diameter must be used with paint spray equipment. In a
pounds per square inch (psi) of a spray gun equipped with
great many instances, malfunction of the spray gun is due
an air cap consuming approximately 12 cubic feet of air
to an insufficient supply of air at the gun. This condition
per minute at 60 pounds pressure.
usually is caused by the use of hose of improper size. A
Table 14-1. Spray Gun Air Pressures
Section II. FREIGHT CARS
board is to be applied before running board saddles are
installed. Running board saddles will receive one coat of
synthetic primer and two coats of olive green enamel
a. Surfaces will be prepared for painting as outlined
before being applied to cars.
f. When painting cabooses, measures will
b. All sections of new wood, except those to be
to prevent paint from damaging signal or brake valves,
lights, gages, first-aid cabinets, firefighting equipment,
c. Parts exposed during repair parts inaccessible
hardware, door and window glasses, and lavatories.
after assembly will be coated as outlined in paragraph 14-
14-5. Application of Materials
d. Wheels, axles, couplers, and parts contained
the journal box will not be painted.
The type and number of primer and finish coats to be
e. On both all-steel and outside metal roofs, care
applied to the various portions of freight cars and
will be taken to cover with the required number of coats
all parts which are folded over or otherwise concealed.
The finish coat on that portion of roof under the running