Section 2 Review Flashcards
Drainage requirements
non-refrigerated
branch lines 1/2” per 10’
mains 1/4” per 10’
refrigerated
branch + main 1/2” per 10’
Testing requirements (DRY SYSTEMS)
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
WMG piping arrangements and sounding
has to be a minimum 3/4 inch corrosive resistant pipe
maximum length 75 feet
maximum rise 20 feet
gauge locations
cannot be smaller than 1/4 inch
antifreeze solutions approvals, concentrations and testing
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
dry systems fill times and air piping requirements
20 psi > calculated trip pressure
minimum 1/2” piping
replenish normal system pressure within 30 minutes
standpipe systems flow requirements
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
hose station max distance
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
standpipe system max and min pressures
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)
13D pipe sizing, water duration, testing requirements
steel pipe minimum 1”
not steel minimum 3/4”
listed fittings + network systems minimum 1/2”
working pressure - no drops
13R head type requirements
only used in wet systems unless specifically listed for use in dry or pre-action systems
pressure and height formulas
psi x feet
0.433 x feet
pipe sizes 13, 13D, and 13R
13R
13D, 13R and 13 flow requirements
13D - 0.05 gpm/ft2
13 + 13R - 0.1 gpm/ft2
antifreeze loop, check valve holes(metric)
1/32" 0.7938mm propylene glycol 38% glycerin 48% CPVC - only use glycerin solutions
standpipe interconnection and gauges
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.
standpipe systems flow requirements
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
antifreeze loop, check valve holes(metric)
1/32”
0.7938mm
13R testing
if more than 20 sprinklers or has FDC follow NFPA 13 testing else 50 above maximum working pressure
standpipe interconnection and gauges
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
Standpipe sizes - drain required
<= 2” standpipe - 3/4” drain
2 1/2” standpipe - 1 1/4” drain
4” standpipe 2” drain
system testing ( WET SYSTEMS)
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
system testing ( WET SYSTEMS)
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
nfpa 13 water supply requirements (pipe scheduled)
light hazard 500-750 gpm 15 psi 30-60 minutes
ordinary hazard 850 - 1500 gpm 20psi 60-90 minutes
