[ILM] 101K Pipi Working Skills, Soldering, and Brazing Flashcards
pipe
conduits or long, narrow cylinders made of metal that have a constant outside diameter
abrasive cloth =
waterproof cloth
always use eye protection when using abrasive cloth for sanding
T or F
True
flaring
45 degrees
during flaring, use a drop of refrigerant oil on the flare cone
T or F
True
annealed copper =
soft copper
pure acetylene is highly _____
flammable
always store acetylene in the
upright position
for 10 - 15 minutes before use
regulators reduce acetylene pressure from 250 psi inside the cylinder to 15 psi for use with a torch
T or F
True
Never use an adjustable wrench on an acetylene bottle’s valve stem
Never open an acetylene bottle’s valve stem more than 1/4 turn
T or F
True
hose colour codes
acetylene - red
oxygen - green
main disadvantage of copper is
its high coefficient of expansion
the copper tube used for refrigeration piping is called
ACR
Type K tubing
Type L tubing
Type M tubing (plumbing)
green
blue
red
always keep copper tubing away from overhead power lines and wires since it is an excellent electrical conductor
True
FPT
MPT
female pipe thread
male pipe thread
Brass is the most common copper alloys, Zinc is added to produce brass
T or F
True
iron pipe is used with
ammonia refrigerant since it reacts negatively with copper pipe
Silver soldering & brazing uses temp above
800F
soft soldering uses temp below
800F
the space between the tube and fitting is the capillary gap
True
solder fills this gap by capillary action
True
if excessive amounts of flux are used
the flux residue may cause corrosion
brazing uses filler metals that melt at temp ranging from
1100F - 1500F
