Section 2 Review

Question 1

Drainage requirements

Answer 1

non-refrigerated
branch lines 1/2” per 10’
mains 1/4” per 10’

refrigerated
branch + main 1/2” per 10’

Question 2

Testing requirements (DRY SYSTEMS)

Answer 2

quarterly tests:
test low air, priming level, accelerator/QOD

semi annual:
test electrical alarms, and tampers

annual
pressure drop test
trip test - make sure valve will trip

3 year test: full trip - flow out of inspectors test

Question 3

WMG piping arrangements and sounding

Answer 3

has to be a minimum 3/4 inch corrosive resistant pipe
maximum length 75 feet
maximum rise 20 feet

Question 4

gauge locations

Answer 4

cannot be smaller than 1/4 inch

Question 5

antifreeze solutions approvals, concentrations and testing

Answer 5

propylene glycol 38%
glycerin 48%
CPVC - only use glycerin solutions
initially inserted into the system
annually
test with hydrometer or refractometer(most common)
Just drain completely if the solution is not adequate when testing

Question 6

dry systems fill times and air piping requirements

Answer 6

20 psi > calculated trip pressure
minimum 1/2” piping
replenish normal system pressure within 30 minutes

Question 7

standpipe systems flow requirements

Answer 7

Class I and Class Ill services, each standpipe shall be sized
for a minimum flow of 500 gpm (1893 L/min)

Designed for a minimum flow of 500 gpm for the first
standpipe plus 250 gpm (946 L/min) for each additional
standpipe.

Minimum total flow
• 1250 gpm (4731 L/min) - unsprinklered
• 1000 gpm (3785 L/min) - buildings sprinkled throughout.

For buildings that exceed 80,000 ft.²(7432m2) per floor
• the minimum flow rate for the additional standpipes shall be
• 500 gpm (1893 L/min) for the second standpipe
• and 250 gpm (946 L/min) for the third standpipe

Question 8

hose station max distance

Answer 8

Class 1 and 3 hose connections:
must be within 150’ for unsprinklered
200’ for sprinklered

class 2 within 130'
120' if < 1 1/2" hose

Question 9

standpipe system max and min pressures

Answer 9

Pressures
• Standpipes shall supply - Minimum Pressure
• 65 psi (4.5 bar) at the topmost 1 ½”outlet Class II
• 100 psi (6.9 bar) when it’s 2 ½” Class I & III

• Standpipes shall supply - Maximum Pressure
• 100 psi for Class II – 1 ½”
• 175psi for Class I and III – 2 ½”

• Maximum system pressure = 400psi (2019 edition is
400psi)

Question 10

13D pipe sizing, water duration, testing requirements

Answer 10

steel pipe minimum 1”
not steel minimum 3/4”
listed fittings + network systems minimum 1/2”
working pressure - no drops

Question 11

13R head type requirements

Answer 11

only used in wet systems unless specifically listed for use in dry or pre-action systems

Question 12

pressure and height formulas

Answer 12

psi x feet

0.433 x feet

Question 13

pipe sizes 13, 13D, and 13R

Answer 13

13R

Question 14

13D, 13R and 13 flow requirements

Answer 14

13D - 0.05 gpm/ft2

13 + 13R - 0.1 gpm/ft2

Question 15

antifreeze loop, check valve holes(metric)

Answer 15

1/32"
0.7938mm
propylene glycol 38%
glycerin 48%
CPVC - only use glycerin solutions

Question 16

standpipe interconnection and gauges

Answer 16

Pressure Gauges NFPA 14 5.5
• An approved 3 ½” dial spring pressure gauge shall be connected with
each discharge pipe from:
• 1. Fire pumps and public waterworks,
• 2. At the pressure tank,
• 3. At the air pump supplying pressure tank
• 4. At the top of each standpipe. Where water will not freeze.
• Exception: Where several standpipes are interconnected at the top,
a single gauge properly located may be substituted for the gauges at
the top of each standpipe.
• 5. Each gauge must be controlled by a valve that drains.

Question 17

standpipe systems flow requirements

Answer 17

Class I and Class Ill services, each standpipe shall be sized
for a minimum flow of 500 gpm (1893 L/min)

Designed for a minimum flow of 500 gpm for the first
standpipe plus 250 gpm (946 L/min) for each additional
standpipe.

Minimum total flow
• 1250 gpm (4731 L/min) - unsprinklered
• 1000 gpm (3785 L/min) - buildings sprinkled throughout.

For buildings that exceed 80,000 ft.²(7432m2) per floor
• the minimum flow rate for the additional standpipes shall be
• 500 gpm (1893 L/min) for the second standpipe
• and 250 gpm (946 L/min) for the third standpipe

Class 2 - most remote standpipe must have a min flow rate of 100 gpm.
limit 100 psi - residual(flowing)
175 psi(static)not flowing

Question 18

antifreeze loop, check valve holes(metric)

Answer 18

1/32”

0.7938mm

Question 19

13R testing

Answer 19

if more than 20 sprinklers or has FDC follow NFPA 13 testing else 50 above maximum working pressure

Question 20

standpipe interconnection and gauges

Answer 20

Pressure Gauges NFPA 14 5.5
• An approved 3 ½” dial spring pressure gauge shall be connected with
each discharge pipe from:
• 1. Fire pumps and public waterworks,
• 2. At the pressure tank,
• 3. At the air pump supplying pressure tank
• 4. At the top of each standpipe. Where water will not freeze.

2 more standpipes - must be interconnected

Question 21

Standpipe sizes - drain required

Answer 21

<= 2” standpipe - 3/4” drain
2 1/2” standpipe - 1 1/4” drain
4” standpipe 2” drain

Question 22

system testing ( WET SYSTEMS)

Answer 22

INSPECTIONS
gauges - quarterly
hanger/braces/supports - annually
pipe and fittings - annually
sprinklers - annually
supervisory signal devices - quarterly
valve supervisory - quarterly
waterflow alarm devices - quarterly
TESTING
antifreeze - annually (before freezing)
gauges - 5 years
sprinklers 50 years then every 10
ESQR - 20 years then every 10
waterflow alarm - quarterly
waterflow alarm(vane and pressure switch type) - semiannually

Question 23

system testing ( WET SYSTEMS)

Answer 23

INSPECTIONS
gauges - quarterly
hanger/braces/supports - annually
pipe and fittings - annually
sprinklers - annually
supervisory signal devices - quarterly
valve supervisory - quarterly
waterflow alarm devices - quarterly
TESTING
antifreeze - annually (before freezing)
gauges - 5 years
sprinklers 50 years then every 10
ESQR - 20 years then every 10
waterflow alarm - quarterly
waterflow alarm(vane and pressure switch type) - semiannually

Question 24

nfpa 13 water supply requirements (pipe scheduled)

Answer 24

light hazard 500-750 gpm 15 psi 30-60 minutes

ordinary hazard 850 - 1500 gpm 20psi 60-90 minutes