Chapter 12 - Linings And Special Coatings

Question 1

some resins used in reinforced linings include?

Answer 1

Polyester
Epoxy
Vinyl ester

Question 2

What is the main feature that reinforcing adds to a resin?

Answer 2

Strength

Question 3

What is the negative effect reinforcing has on a resin?

Answer 3

The ability of a liquid to travel along the fibers path (wicking) and cause corrosion our the substrate, blisters or delamination of the system.

Question 4

With a lining the normal requirement for surface preparation for new surfaces is?

Answer 4

Cleaning in accordance to SA3/NACE 1/SSPC 5 white metal blast cleaning.

Question 5

In regards to linings where may you see SA2.5/NACE 2/ SSPC 10 near white metal blasting?

Answer 5

When performing maintenance work.

Question 6

When preparing the surface for lining, when is water jetting only used?

Answer 6

Where a profile already exists.

Question 7

Where may you see a requirement for water wash or jet cleaning?

Answer 7

When there is a need to remove soluble contaminates and then abrasive blast.

This process may be repeated several times before an acceptable result is achieved.

Question 8

What is the purpose of anti -fouling (AF) paints?

Answer 8

1) to make the hull of the ship so distaste full the larva of the biofouling reject it as a home
2) makes the hull so slick the larva cannot adhere.

Question 9

What is the word “lining “ used to describe?

Answer 9

It is described as a coating this is usually in immersion service.

Question 10

The three main types of anti-fouling paints are?

Answer 10

Ablative
Self smoothing
Foul release

Question 11

What are the types of fireproofing coatings?

Answer 11

Cementitious - made of lightweight cement and can be applied several inches thick
Intumescent - a substance that swells or bubbles up as a result of heat exposure, thus increasing in volume, and decreasing in density.

Question 12

What are Flourpolymer coatings best known for?

Answer 12

Their non stick feature and also have excellent chemical and high temperature resistance.

Question 13

What are the two broad curing categories that powders fall into?

Answer 13

Thermoplastic - materials that soften when heated and return to their original hardness when cooled
Thermosetting - materials that harden when heated and retain their hardness when cooled.

Question 14

What are the four distinct stages powders applied to a heat source pass through?

Answer 14

1) the flow stage
2) wetting stage
3) gel stage
4) curing stage

Question 15

What is the flow stage? In regards to powders applied to a heat source.

Answer 15

Flow stage which occurs when the particles of powder begin to flow, but are not fully liquid

Question 16

What is the wetting stage? In regards to powders applied to a heat source.

Answer 16

Wetting stage which occurs when the particles of powder absorb more heat, fully liquefy, and wet the surface.

Question 17

What is the gel stage? In regards to powders applied to a heat source.

Answer 17

Gel stage which occurs when the particles of the powder begin to gel, converting into a solid.

Question 18

What is the curing stage? In regards to powders applied to a heat source.

Answer 18

Curing stage allows for the further changes to take place, permitting the powder to cure completely.

Question 19

What are the advantages of plural component airless spray over single piston airless spray system?

Answer 19

Accurate mixing of materials without human element
Ability to spray very thick solvent free materials without thinner
The ability to spray materials with a very short pot life

Question 20

What are the disadvantages of plural component airless spray over single piston airless spray system?

Answer 20

Cost is much higher than cost of single piston pump
Higher education requirement for the mechanic
High voltage electricity is required for the heaters
Applicator’s job more difficult with multiple hoses