Anti-fouling Paints - 9

Question 1

Anti-foulants on ship hull or structure roughen the surface and can increase the ,,,,, ;

Answer 1

• Drag factor

Question 2

Even moderate fouling can reduce speeds of ship by ,,,,,, % ;

Answer 2

• 10%

Question 3

Typical foulants are;

Answer 3

• Barnacles
• Mussels
• Tubeworms

Question 4

Plant growth in the form of weed will be ,,,,,,;

Answer 4

• green on vertical sections

- to red and brown on shades

Question 5

Bacteria and moulds are also classed as;

Answer 5

• Foulant

Question 6

A ship with a quick turnaround in port therefore will be less liable to sustain;

Answer 6

• Barnacle growth

Question 7

Anti-fouling coatings release materials ,,,, to the foulants;

Answer 7

• Toxic

Question 8

Anti-fouling coatings materials works and release a calculated amount of toxic material, usually by ,,,,, into the sea water;

Answer 8

• Leaching

Question 9

Spores and larvae survive on ,,,,,,, ;

Answer 9

• Hull or structure

Question 10

A leaching rate of 10 microgram/cm2/day of ,,,,,, was considered sufficient for most foulants ;

Answer 10

• Cuprous Oxide

Question 11

Various toxins have been employed but for obvious reasons use of ,,,,,s has been discontinued although use of tri-butyl tin (TBT), was prevalent until recent legislation.;

Answer 11

• Heavy Metal

Question 12

All anti-foulants are applied over ,,,,, coatings ;

Answer 12

• Anti-Corrosion