CORROSION PR. 2
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ON - BOARD MAINTENANCE
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1. Pyt. Why is fresh water washing important before commencing paint application?
D Odp. To remowe soluble salts.
2. Pyt. What is the minimum number of degres centigrade the steel temperature must be
above the dew point before paint application?
C Odp. 3oC
3. Pyt. What piece of equipment would be the most effective in rwmoving corrosion from
difficult cornes or angled areas?
A Odp. Needle gun
4. Pyt. Why should the use of long lines be avoided, if possible, during spray application?
B Odp. Risk of presure drops.
PREPARATION FOR REPAIR OR MAJOR REFURBISHMENT
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1. Pyt. What is the most efficient method of removing HULL FOULING? Is it:
C Odp. High Pressure Water Washing?
2. Pyt. Which of the following statements best describes one of the main advantages of
Hydroblasting with fresh water as apposed to Dry Abrasive Blasting?
C Odp. As well as removing corrosion products it also removes salt contamination.
3. Pyt. Alerge area of exposed deck is to be blasted to an agreed standard of Sa2 before
applicsation of an epoxy paint system.In the vicinity of some pipes where difficult
access means that the blasting is not able to remove all the corrosion.What do you
do?
C Odp. Discuss the various options wiyh the contractor.
APPLICATION
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1. Pyt. There are 3 factors, which help contribute to correct performance of a paint system.
Which are they?
\/ Odp. \/ - A, E, G.
2. Pyt. The wet film of paint which is applied bears a direct relationship to the final dry film
thickness of the coating.Taking wet film measurements can be very important.Why is
it important to take these measurements as quickly as possible?
C Odp. To obtain as close a reading to the actual wet film as possible.
3. Pyt. When using Airless Spray equipment what are the 3 most important safety rules to
observe?
\/ Odp. \/ - C, D, F.
4. Pyt. Paint is applied to a deck in the moring.Each moring the air temperature is 7oC.
In early afternoon the temperature of the air to 23oC. You are told that the maximum
overcoating time for the paint coating is 36 hours at 20oC and 48 hours at 10oC. In
this case, what maximum overcoating time do you allow?
D Odp. You consult the paint suppliers representative.
EVALUATION OF THE PAINT JOB
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1. Pyt. Which are the 3 factors which influence the lenght of time from finishing an antifouling
to the flooding of the dry-dock?
\/ Odp. \/ - A, D, E.
2. Pyt. During a drydock paint application why only check dfts on spot blasted areas, how do
you check the antifouling thickness?
C Odp. Spot blasted areas are the only areas coated from the steel surface upwards-you
control the antifouling thickness by controling the distribution.
ASSESSMENT
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13 pytan - powtorka wszystkich poprzednich !