PDX_12_Plumbing Details

Question 1

Prevents pipes movement when system is pressurized.

Typ req’d all places pipe changes direction

Answer 1

Thrust Blocking

Question 2

Max length of drainpipe between trap and air vent, must be

< or = 48x pipe ø

Answer 2

Critical Distance

Question 3

Used to find probability demands on plumbing fixtures

Answer 3

Fixture Units (FU)

1 FU = 1 cubic ft /minutes

Question 4

Method of soldering copper plumbing,

or the condensation on cold pipes / building materials

Answer 4

Sweating

Question 5

Pipe fittings used to couple ends of 2 pipes, neither of which can be rotated

Answer 5

Union

Question 6

U-shaped tube used to transfer liquid from upper level to lower one by suction

Answer 6

Siphon

Question 7

Noise caused by subtle pressure increase in pipe when valve or faucet is closed abruptly

Answer 7

Water Hammer

Question 8

Extra set of curves in pipe run that contract / expand to accommodate thermal movement

Answer 8

Expansion / Bend Loop

Question 9

Plumbing arrangement on steam boilers to avoid rapid water loss due to break in condensate return line

Answer 9

Hartford Loop

Underwriters loop

Question 10

Lowest point on inside of drain, pipe, channel, or other liquid carrying conduit

Answer 10

Invert

Question 11

Short piece of pipe w/ threads at each end to connect fittings and valves

Answer 11

Nipple

Question 12

End of pipe enlarged to receive end of another pipe to form joint

Answer 12

Bell

Question 13

Vent which is continuation of trap and drain to which it connects

Answer 13

Continuous Vent

Question 14

Vertical pipe used to connect water from roof drain or gutter to ground

Answer 14

Leader or Downspout

Question 15

Any vent serving 2+ traps in sanitary drainage system

Answer 15

Circuit Vent

Question 16

Vent which connects from drain to soil stack vent

Answer 16

Loop Vent

Question 17

Automatic valve which admits air into supply pipe to prevent siphoning polluted water back into supply

Answer 17

Vacuum Breaker

Question 18

Min. fixture flow rate
\+ pressure lost due to height
\+ pressure lost by friction in piping
\+ pressure lost by flow through meter
=

Answer 18

Street Main Pressure

Question 19

( Length x coefficient of expansion ,k)

x ( Final temp - Original temp) =

Answer 19

Thermal Expansion (L)