service wide exam colors and coatings Flashcards
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Nozzles shall be similarly attached to the hose, with fittings designed to prevent unintentional
disengagement of the nozzle. The nozzle end shall be provided with a?
deadman control to provide
direct “fail-safe” cutoff of the abrasive in the case of loss of control of the hose by the operator.
During the application of the abrasive, pressure drops within the hose lines often cause surges that
can throw operators off staging or scaffolding
working on scaffolding or elevated
staging shall be protected by appropriate fall protection equipment such as safety harnesses and
lines.
In the application of the abrasive, the operator shall assure?
the use of straight hose runs, or wide,
sweeping curves to prevent the erosive action resulting from sharp bends in the hose, and the
possibility of blowouts or similar personnel hazards.
type of abrasive banned is?
Use of Silica is specifically prohibited
Hearing Protection. All Coast Guard employees engaged in sandblasting operations, whether
as an operator or helper, shall wear
shall wear double hearing protection (earplugs and earmuffs). All
other personnel in the vicinity of the operation must wear double hearing protection unless a
sound level survey indicates that single hearing protection (earplugs or earmuffs) is adequate
All personnel engaged in abrasive blasting more than 30 days per year shall
be enrolled in
Occupational Medical Surveillance and Evaluation Program (OMSEP
Gun OperatorThe gun operator and assistant shall wear
wet-weather
gear, face shield or goggles, work gloves, shoes with antiskid soles, and when working from a
scaffold or other elevated position, a safety harness.
Hydroblast equipment should be used at what degree arc and how far from the surface being blasted
hold the gun at a 60-degree angle with
tip approximately 8 to 12 inches from the surface being blasted.
The straight jet nozzle shall be used only
special cases such as cleaning weld seams or
crevices.
Toxic Materials In Paints.Lead,Zinc
0.06%
Chromate. paint is only for?
prohibited except as primer for aircraft
Mercury. Paints
prohibited.
Isocyanates. Paints containing isocyanates, including Toluene Diisocyanate (TDI), Hexamethylene Diisocyanate (HDI) and Diphenylmethane Diisocyanate (MDI),
prohibited
unless specifically required by this manual.
Coal tar epoxies
specifically prohibited for any application
The following formula may be used to ensure that the as applied VOC content does not exceed the
CG allowable limits.
R = (VS) (VOHAP limit) - MVOC
Dth
Slag can usually be recycled
3-4 times. Slag usually cleans painted surfaces much faster than
mineral grit.
Mineral grit like aluminum oxide and garnet can usually be recycled
5-7 times. Mineral grit cuts
unpainted steel faster than slag and produces less visible dust
Steel shot can be recycled up to
20 times; however, the initial cost of steel shot is greater and its
higher weight per equal volume means that disposal costs may approximate mineral grit disposal
costs.
steel shot also will do what to the surface
surface profile created by steel shot does not allow a coating to adhere as well as
the surface profile created by mineral or slag grit
Shelf Life Extension Program.
life for one year by filling out a shelf life extension label
Previous shelf life expiration date:
New shelf life expiration date:
Signed:
Date:
Mix the paint. If the paint does not develop a smooth even consistency after
10 minutes in a
power shaker, it is not suitable for use.
adhesion on oil based and water based paints.
Cut a series of cross-hatched lines
into the dried paint film with a razor blade. Then apply and remove a strip of duct tape. If
90% of the paint stays in place, it is suitable for use.
Check the adhesion of epoxy paints
Tap the dried paint film with a hammer 10-20 times
with enough force to drive a nail 3/4” into a piece of pine.
Do not extend shelf life on paints with;
improperly sealed or corroded containers, two part
epoxy paints stored above 140oF, water based paints which have been frozen, or oil based
paints which do not mix to a smooth consistency.
Most two-part epoxies can be properly stored in ambient temperature
conditions and remain functional for up to
10 years
Water based and oil based paints, can be
stored at ambient conditions for up to
3-5 years
Previously opened cans of water based and oil
based paints are usually not suitable if stored for longer than
one year
Previously opened cans
of unmixed two-part epoxy paint in good condition may still be good after
after 3-4 years storage
Interior painting should normally be accomplished at intervals of
3 years or greater.
ensure a dry surface, the temperature of the surface must be
5°F above the dew point temperature
Maintenance of paint records is essential for evaluating the performance of coating systems.
Aboard ship this information is entered in the Hull History as required by the Naval Engineering Manual,
COMDTINST M9000.6 (series). For small boats, this information should be kept in the boat record. At
shore establishments, a Painting Log should be maintained.
The following information should be
recorded whenever complete repainting is done:
a. Date of application.
b. Area painted.
c. Name of each finish material used, number of coats, specification number, name of manufacturer, date of
manufacture, and manufacturer’s lot number.
d. Number of gallons of each type paint used.
e. Temperature.
f. Dewpoint.
g. General statement of weather conditions.
h. Dry Film Thickness
Abrasive Blast Cleaning
There are five degrees of blast cleaning
White Metal Blast Cleaning.
white metal is the highest
level of blast cleaning. It is used for coatings that must withstand exposure to very corrosive
atmospheres where a high cost of surface preparation is considered to be warranted
Near-White Blast Cleaning
evaluation of the completed cleaning job must be a
visual judgment. This preparation affects a 10 percent to 35 percent savings over white metal
blasting and has proven to be satisfactory for many of the special coatings developed for longterm
protection in moderately severe environments
Commercial Blast Cleaning.
removal of
all loose scale, rust, and other surface contaminants. This method of surface preparation will
result in a high degree of cleaningadequate for the majority of paint
systems under normal exposure conditions
For the marine environment, near-white blast cleaning
is the most common recommended level of surface preparation.
Industrial Blast Cleaning
lesser degree of
cleaning than a Commercial Blast Cleaning where the objective is to remove most of the
coating, mill scale, and rust, but it is not worth the expense or time to remove all traces.
When painting, the paint brush is dipped.
dip only half the bristles into
Hold the brush at
right angles to the surface being painted
If the brush is held obliquely and is
not lifted,
uneven and it will show lap spots giving a “dabbed” appearance
brush that is held at too great an angle (obliquely)
will wear down at the ends.
Roller Cover Materials.thin nap is
used on smooth surfaces and
thick nap is used on
rough surfaces
recommended for applying enamels to smooth surfaces
Blends of wool, rayon, and mohair (Angora goat’s wool) are considered mohair covers.
painting cyclone-type and other wire fences
Lamb’s Wool maintains its resilience and carries a greater amount of paint than many other fabrics
Synthetic Covers
Dynel and Dacron are available for covers and can be generally used
except for coatings containing alcohols and ketones
Conventional Air Spray uses
air at pressures between 40 and 70 psi to atomize the paint
optimum for conventional
spray
temperatures are well below the 70oF Hot spray
Airless Spray is created by forcing paint through a restricted orifice at very high pressure.
Liquid pressures in
excess of 1500 psi are
proper handling of the gun as it does on correct
adjustments of the equipment. In general, hold the spray gun
6 to 8 inches away from the surface being
painted.
Always keep the gun at
right angles to the surface.
Interior surfaces are generally painted
once every
3 years.
Exterior steel surfaces on cutters and boats above the main deck shall not
normally be top coated more often than every
two years.
Underwater Body and Boot-Top Surfaces.
(approximately 9-12 years).
Weather Deck Surfaces (Non-Flight Deck).
3-6 years of service
Powder Coatings
heating in an oven at
temperatures from 275°F to 450°F.
