General review SSI3a
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Foam Durations and Densities
 i) The minimum duration is 10 min
 ii) The minimum density is .16 GPM/Sq. FT
 iii) *if density exceeds .16 gpm, the duration can be reduced to 7 minutes
 iv) *After the foam, water must last 60 minutes

High Expansion foams
 i) Are limited to a deluge system
 ii) Installed in Aircraft hangars
 iii) Expansion rates of 2%, 2.5%, 2.75%

E.S.F.R Heads
Need to be installed under ducts over 2’

Max temperature of water in a sprinkler system:
120 F or 49 C

Min size of Aux Drain:
Minimum size is ½”

Cornice sprinklers are to be mounted:
 i) 8” below roof decking
 ii) If cornice has an overhang of more than 1 foot
 iii) Not spaced more than 10’ apart

Max coverage area for any 1 head:
400 ft

Can a Doubleinterlock preaction system be gridded?
No

C02 Systems:
 Pipe and fittings up to ¾” are schedule 40 galvanized
 ¾”2” are schedule 80
 Over 2” fittings are galvanized forged steel

Low Pressure C02
 Containers are maintained at a temperature of 0 F with a pressure of approximately 300 PSI
 Storage tanks range from 500 Lbs to 125 tons
 Nozzle discharge as high as 2,500 pounds per minute
 When CO2 is released the oxygen drops from 21% to 15%

CO2 systems
 Devices function properly in temperatures ranging from 20F to 140F
 High Pressure cylinder is maintained at 850 PSI @ 70F
 Low Pressure systems: working pressure of at least 325 PSI, supervisory alarm is set at 315 PSI and special relief valve at 250?

Water Motor Gong
 No farther than 75’ away from the valve
 No higher than 20’

Fire hydrant hose connection must be ___ from the ground?
18"

Area of a triangle:
(Base X height)/2

ABC regarding Trenches:
A ladder is required in a trench when it is 5’ or deeper. The ladder must extend 3’ above the trench

Minimum thickness of metal you can use a power driven stud on?
3/16”

Foam/water sprinkler system:
 Usually controlled by a deluge valve
 Difference between Foam/water sprinkler system and a Foam/Water spray system is the discharge device

Halon NFPA 12A
 Warning signs must be inside and outside of area protected with halon
 Not allowed to deviate from engineered design
 Test semiannually
 Tanks must be refilled if they lose more than 5% of the volume

High pressure cylinders:
 Testing: semiannually
 Refill if pressure dropped 10%

High pressure systems:
Tested every 5 years but if not used and still in service it can be extended to 12 years

Manual Pull Stations:
 No higher than 4’ from grade
 Halon pull station no higher than 5’
 Max travel: 14”
 40 psi pulling force

Fixed water spray systems:
Min. Sizes of pipe, steel is 1” and copper is 3”

Max discharge rate of a fixed water spray system?
Single system not exceeding 3,000 GPM

Can a single water supply feed more than one fixed water spray system?
YES

Fixed water spray systems:
 Max 500 gallons per control valve
 Water supply must last 15 minutes

If connecting antifreeze system to a potable water supply use:
Propyleneglycol

Flushing requirements:
 Min size of flushing connection: 1 ¼”
 Min size for flushing city water supply: 2”

When are local alarms not required?
When there are less than 20 sprinkler heads

Small orifice heads:
3/8”, need a strainer

Fixed water spray systems:
 Spray must meet or overlap
 Min static pressure is 50 psi
 Min operating pressure at most remote nozzle is 50 psi

Primary design of aFixed water spray systems:
To protect the equipment 1st, then the structure

Most effective dry chemical:
Urea potassium bicarbonate

When is a QOD required on a Dry valve:
system is greater than 500 gallons

Clean out on CO2 system:
Needs to be 2” long and same diameter as piping. (nipplecap)

CO2 systems (NFPA 12)
 Up to ¾”: sched 40 galv.
 1” and up: sched 80 galv.
 Test: 40 PSI for 10 min (allowed 8 PSI loss)

Fixed water spray systems:
 No bushings allowed
 Max nozzle spacing is 10 feet

Drain sizes:
 4” and larger: 2” drain
 2 ½” – 3 ½”: 1 ¼” or larger
 Up to 2”: ¾” or larger

Fixed water spray systems:
You can use copper if pressure does not exceed 175 psi

Electronic monitoring
Every electronic device has a microswitch AKA Tamper switch

Foam Generators
 Aspirator type:
 Produce foam with expansion ratios not over 250:1
 Blower: 2501000

Foam types
 Low Expansion
 220
 Medium expansion
 20200
 High Expansion
 2001000

NFPA Standards
 CO2 is NFPA 12
 Halon is NFPA 12A
 Clean agent is NFPA 2001
 Flammable & Combustible Liquid codes is NFPA 30
 Durations and Densities is NFPA 16
 Aircraft Hangars is NFPA 409
 Firepumps: NFPA 20

Water supply (Durations and Densities)
 Light Hazard: 100 GPM for 30 minutes
 Ordinary Hazard: 250 GPM for 6090 minutes
 Extra Hazard: 500 GPM for 90120 minutes

Metric to Imperial conversions:
 Feet of pipe/3.28= meters
 Meters of pipe X 3.28= Feet

Foam/water spray system
The smallest permissible Discharge orifice is:
¼”

Airplane Hangar Doors
 Class 1: Over 28’
 Class 2: Less than 28’

Dry System
Most common problem when water is coming out of the ball drip:
The clapper is not seated

NFPA standard regarding Low, medium, and high Expansion Foam is:
NFPA 11

Restrictions to type of piping and fittings used on a foam system:
Can't use galvanized pipe or fittings

Extra Hazard (Group II)
Max time for water delivery in extra hazard (group II) is:
45 seconds

Can a dry system be gridded?
No

Minimum pipe schedule to be used for sway bracing?
Schedule 30

Dry Chemical systems:
The expellant nozzle needs to be 20 pipe diameters away from the 90

Foam systems:
Need to be preprimed and flushed annually

Filling a container with foam concentrate:
When filling a container with concentrate, pump it into the bottom of the container or use a long funnel so as not to aerate the foam

Clean Agent:
Exposure Limits:
 9% concentration: no longer than 5 minutes
 Greater than 11%: No longer than 1 minute

Conversions:
 1 cubic foot=6.24 Imperial Gallons or 7.5 US Gallons
 1 foot of water exerts .433 PSI
 1 cubic foot of air = 0.076 Lbs
 1 metre (height) of water exerts 9.81 kpa

Fire Pump testing
Under no flow:
 Electric: monthly for 10 minutes
 Diesel: weekly for 30 minutes

Testing:
 Check valves: 5 years
 Main drain: annually
 Water flow alarms: quarterly
 F.D.C: Monthly
 Standard sprinklers: 50 years
 Quick Response: 20 years
 Dry Pendants: 20 years
 High Temperature Heads: 5 years

Tube Bending (diameter of bend):
2” or smaller has a diameter of 6 pipe diameters 2 ½” or larger is 5 pipe diameters

Flushing Requirements of Underground Piping:
 4” 390 GPM
 6” 880 GPM
 8” 1560 GPM

Limited Water Supply:
Pressure tank sizes:
 Light Hazard: capacity not less than 2,000 gallons
 Ordinary Hazard Group 1 & 2: capacity not less than 3,000 Gallons
 Smallest acceptable water supply considered by insurers advisory organization is 6,000 Gallons

ABC method of testing a dry valve:
 Lock the clapper open
 Plug the autodrip

Gravity Tanks:
 Min size of fill pipe: 2”
 Min size of overflow pipe: 3”
 Max time to fill tank: 8 hrs
 Min size of discharge pipe: 6”
 Location of a water level supervisory switch: 12” below High water level
 Min size of tank drain: 2”
 Min temp of water: 42 F

Pressure Tanks:
 Needs to be replenished in 4 hours
 Fill 1/3 air, then 2/3 water
 Min pressure is 75 PSI
 Min size of water supply pipe: 1 ½”