refridgeration Flashcards
What is Cupro nickel?
An alloy containing 75% copper and 25% nickel
What is a non ferrous meatl?
Is which does not contain iron.
What is a ferrous metal?
Contains Iron
What does ammonia have a affinity for?
water
What is Electrolysis?
A reaction causing separation of elements from metals such as ores. contact with salt water.
what are the properties of cupro nickel when in contact with salt water?
Has a neutral electrode potential to salt water and has a high resistance to saltwater corrosion.
What is bronze highly resistant to?
salt water corrosion
What does Annealed copper mean?
To adding heat to restore its malleability.
What is the melting point of silver solder?
600 - 900 degrees
What is the temp of the oxy flame?
3200
What are silver brazing alloys composed of?
Phosphorous, tin and silver
Brown tip%?
blue tip%?
Yellow tip%?
brown = 15
blue= 45
yellow = 2
What is b lue tip for?
to weld 2 dissimilar metals such as copper to steel
What are dissimilar metals?
2 metals the contact in a corrosive invironment and when wetted with water accelerates the Corrosion rate.
What is a flash back arrestor?
TO prevent flame receding back through the torch then into the bottle.
What does oxidizing mean?
what does carburizing mean?
what does neutral mean?
Excessive oxygen
Excessive acetylene
Perfect mix
What code of practice is purging under?
As/Nz c.o.p 2007
Where are service valves located on the system?
Comp, receivers, inline piping.
Front seat the service valve?
no refrigerant flow through valve. only to component.
Back seat the service valve?
No Refrigerant flow to service valve. full flow through valve.
