MWA-B

Question 1

what are the 2 major alloys of copper

Answer 1

bronze and brass

Question 2

how are copper tubes and copper piping different

Answer 2

copper tubes have thinner walls, and are specified by an approximate inside diameter

Question 3

what colour pipe is allowed to be installed under ground in a drainage system

Answer 3

green or blue

Question 4

what is it called when a fitting sucks in the solder

Answer 4

capillary reaction

Question 5

what type copper pipe is the thickest

Answer 5

type k-green

Question 6

what colour is type L copper

Answer 6

type L copper is blue

Question 7

what type copper is the thinnest and what is its colour

Answer 7

type m and it is red

Question 8

what type copper is used in a hydronic heating system

Answer 8

type H and it is white

Question 9

what colour is type dwv copper

Answer 9

yellow

Question 10

what type of copper is used in a medical gas system

Answer 10

type L and K

Question 11

what type of copper is used in a gas system

Answer 11

type g, yellow

Question 12

what is the most common type of copper used in B.C and why

Answer 12

hard temper type L, because of the water being more acidic

Question 13

in Canada what is the most common type of copper used

Answer 13

type L and M hard temper

Question 14

how are copper pipe specified

Answer 14

by their nominal inside diameter

Question 15

how is copper tubing used in refrigeration sized

Answer 15

directly by its outside diameter

Question 16

what is the temperature is soldering performed

Answer 16

840 degrees F or lower

Question 17

what temperature is brazing done at

Answer 17

840 degrees or higher

Question 18

what is the maximum allowable lead content in solder used in a potable water system

Answer 18

0.2%

Question 19

what is the purpose of the flux

Answer 19

clean the pipe and prevent oxidization

Question 20

what type of copper pipe can you t-drill

Answer 20

K and L

Question 21

what would be required when brazing 2 dissimilar metals

Answer 21

high temperature flux

Question 22

what is an expansion loop and what must be taken into consideration when installing

Answer 22

an expansion loop, allows for expansion due to temperature change, the loop should be installed so there is no strain when pipe expands and contracts

Question 23

what are the steps of flaring copper

Answer 23

1) cut the pipe
2) ream the pipe
3) put the nut on the pipe
4) flare the pipe

Question 24

what are the steps of using a compression fitting on a pipe

Answer 24

1) cut the pipe
2) ream the pipe
3) put the nut on the pipe
4) put the ferrule on the pipe

Question 25

what temperature does fluxes for brazing melt

Answer 25

800-900 degrees Farenheit

Question 26

what type of flame do you want when brazing

Answer 26

a neutral flame

Question 27

what is annealing copper

Answer 27

making copper soft

Question 28

what wall thickness is thicker sched 40 or sched 80

Answer 28

sched 80

Question 29

what is galvanized steel coated with

Answer 29

zinc

Question 30

why is ductile very heavy

Answer 30

because it is lined with cement to prevent corrosion

Question 31

what is the length at which steel pipe is supplied at

Answer 31

21 feet +/- 1/2”

Question 32

what angle are the bevels on pipe

Answer 32

30 degrees

Question 33

what is ABS pipe used for mainly

Answer 33

non pressure drainage

Question 34

how far do you put a crimp ring on from the end of the pipe

Answer 34

1/8 to 1/4 of an inch from the end of the pipe

Question 35

what is abs pipe classified as

Answer 35

thermoplastics

Question 36

what is the pressure loss of PVC pipe sched 80 that has been threaded

Answer 36

50%

Question 37

how are thermoplastic pipes joined

Answer 37

through 1 or 2 step solvent jointing or through spigots with o rings where the spigot is placed on the upstream portion

Question 38

what is a 22.5 cast iron bend also referred as

Answer 38

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