Unit 7 review
if a technician needed 5/8" ACR for an installation and was located near only a plumbing supply house ,what size and type of pipeshould he ask for ?
1/2" ID copper
What is A common filler material used for brazing?
A common filler material used for brazin is 15/60% silver
Why are ACR tubing lines insulated?
ACR tubing lines are insulated to keep the refrigerant from absorbing excess heat from the serounding air, It also prevents condensation from forming on the lines.
What are three alternating mechanical piping methods?
Alternative mechanical piping methods are tubing conectors, Push on type fitting with internal gasket and metal teeth for grabing onto the pipe selection, and crimping the press type fitting to join two pipe sections.
In what sizes is CU available in?
CU is normally availible in sizes from ¼ to 7/8 in 25ft of 50ft rolls
What are filler metals for soldering?
Filler metals for soldering are 50/50 and 95/5 50/50 tin/ lead and 95/5 tin/antimony usualy in the 360F to 500F range.
What are four types of plastic pipes
Four types of plasic pipes are ABS, PE, PVC and CPVC
How can soft cu tubing be bent?
Small diameter tubing can be bent by hand, where as larger tubing can be bent with tube bending springs or lever type tubing bender
What are some uses for steel pipe
Steel pipe is used in plumbing, hydronic heating, and gas heating aplications, is joined with threaded fittings.
Which is the strongest type of CU
THE K type
What does The size of ½ inch refer to, with regards to plumbing and heating
The size of ½ inch would refer to the Inside Diameter with regard to CU used in Plumbing and heating
What does The size of ½ inch refer to, with regards to refrigeration and AC
The size of ½ inch would refer to the Outside Diameter with regard to ACR Cu
What are the elements that make up brazing filler metal alloys?
The solder used are alloys containing 15% to 60% silver or copper alloys containing phosphorous (BCup),
What is The standard weight of copper for refrigeration and AC
The standard weight of copper is Type L
Which side of the system requires insutlation
Tubing for AC installation is insulated on the low pressure side
How do you prepare and thread the end of a steel pipe
When assembling the pipe, use the correct pipe thread dope on the male threads. Do not apply the dope closer than two threads from the end of the pipe, otherwise it might get into the pipe system.
How can you make a good solder copper tubbing /fitting joint?
When soldering a FLUX is used to minimize oxidation while the joint is being heated
A.N.S
american national standard
pipe threads , when used on pipe that will contain liquid or vapor under pressure ,_____.
are tapered should have atleast seven perfect threads generally have a "v" shape
PVC (POLYVINYL CHLORIDE)
can be used in high pressure applications at low temperatures. it can be used for water,sewage,gas,certain industrial processes,and irrigation systems .
describe method for making flare
cut the tube to right length ream to remove burrs slip the flare nut over the tubing clamp the tube in the flaring block place yoke on block turn screw down firmly
when soldering or brazing , the filler metal is :
heated directly by the flame from the heat source
the size indicated for the diameter of type L copper tubing for plumbing is the aprox
inside demension
a swaged joint
is made by expanding one piece of tubing to fit over another piece of tubing the same diameter
a flare joint
is made by expanding tubing to fit over other tubing
abs( ACRYLONITRILEBUTADIENE STYRENE)
is used for water drains , waste, abd venting .
when soldering why should flux be used ?
it helps prevent oxidation it keeps pipes clean it helps solder flow easier
NPT
national pipe taper
95/5 solder should be used
on the low side of the system
annealing
operation of heating and cooling tubing to make it softer
ACR
outside diameter
when joining steel pipe _____ should be applied to the threads before connecting.
pipe dope
plastic pipe is used often for
plumbing , venting, and condenstate applications .
CPVC(CHLORINATED POLYVINYL CHLORIDE)
similiar to pvc except that it can be used for temperatures up to 180• F at 100 PSIG . it can be used for both hot and cold water supplies and is joined to fittings in the same manner as PVC.
one reason for insulation on a suction line is to help maintain the proper ____.
superheat temperature
capillary attraction
the attraction of liquid material between two pieces of material such as two pieces of copper or copper and brass .
when making a swage joint,what should the depth of the enlarged portion of the tube be ?
the tube should extend above the block by an anount equal to the od of the tube plus approx 1/8in
when soldering flux should be applied
to the male part of the joint only
four tools needed to properly prepare and thread steel pipe
tube cutter chain vise reamer die(threader)
PE(POLYETHYLENE)
used for water, gas, and irrigation systems .
