Plumbing

Question 1

how is pipe measured

Answer 1

Metal Pipe is on inside diameter, tubing is outside diameter.

Question 2

what is static water pressure mean?

Answer 2

The pressure at the tap when there is no water flowing in the system

Question 3

what is an air chamber?

Answer 3

prevents water hammering

Question 4

how are sewer cleanout located?

Answer 4

approx every 50’ and where the sewer takes a turn.

Question 5

WHat is a branch soil line?

Answer 5

it collects the sewer waste from sources in a general area

Question 6

what is a fresh air intake?

Answer 6

equalizes pressure within a plumbing to allow sewage flow.

Question 7

what are req’d for a cistern?

Answer 7

-Debris filter
-Steep roofs
-Metal roofs better (no contaminates)
-

Question 8

what is intemecent paint?

Answer 8

it coats steel so that to retard fire

Question 9

which piping material generally has the highest coefficient of thermal expansion?

Answer 9

Plastic or PVC

Question 10

what is the ADA mounting height of a flush control valve?

Answer 10

44”

Question 11

generally what types of plumbing fixtures do not need to be connected to a stack vent?

Answer 11

water closets

Question 12

Chlorine is added to treated water for what reason?

Answer 12

kills bacteria and carcinogens

Question 13

what is the approx pressure of a muni water system?

Answer 13

50 psi

Question 14

what is a branch soil pipe?

Answer 14

A pipe that carries off liquid waste directly from the waste soruce

Question 15

how much is a cubic foot in gallons?

Answer 15

7.5 gal

Question 16

how many feet if water is = to 1 psi?

Answer 16

2.31

Question 17

what is the static pressure loss per vertical foot?

Answer 17

.434

Question 18

what is an ionization detector?

Answer 18

its a fire detector that catches combustion

Question 19

what is the min slope for a domestic sewer pipe?

Answer 19

1/4” per foot (2%)

Question 20

what is a passive smoke control system?

Answer 20

its one with a system of smoke barriers arranged to limit the migration of smoke

Question 21

what is an active smoke control system?

Answer 21

is engineered that uses mechanical means (fans) to produce positive pressure differentials.

Question 22

when are smoke vents req’d?

Answer 22

on F & S occupancies over 50k sq ft

or H occupancies over 15k

Question 23

in a light hazard situation according to NFPA what is the sprinkler head coverage?

Answer 23

1 sprinkler per 200 sq ft

for exposed combustible roof structures that drops to 130

Question 24

what are the 4 types of fire extinguishers?

Answer 24

A: ordinary combustible wood & paper. Water based agents in extinguisher
B: Flammable liquids. Contain smothering agents like co2
C: Elec equip fires. non conductive agents (ie no water)
D: Combustible metals.

Question 25

what is a vacuum breaker?

Answer 25

it admits air when suction occurs in the water supply pipe. Typically seen in flush valves.

Question 26

what does ABS stand for?

Answer 26

Acryonitrile-Butadiene-styrene