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Flashcards in methods Deck (10):
1

What does an inhibitor do

Protects iron in central heating system

2

What does a galvanised coating do

Protects LCS from environment and oxygen in water

3

What is dezincification

Form of corrosion that can occur within a plumbing and heating system

4

What is electrolytic corrosion

Happens where dissimilar metals are in contact with each other through the presence of an electrolyte

5

What is pitting

After a solder joint is made, if flux is not cleaned off the outside of the tube and flushed out of the inside of the copper tube at the commissioning stage, the copper could be affected by type 1 pitting corrosion

6

What is water

Chemical compound of hydrogen and oxygen

7

What is temporary hardness

Contain calcium carbonates and can be removed by heating the water above 65°C, the temporary hardness is released as scale

8

What is permanent hardness

Contains calcium sulphates and can only be removed by a base exchange material (water softener)

9

What does water have the ability to do to lead

Dissolve it, this is called plumbosolvent

10

What is water that is aggressive towards copper called

Cuprosolvent