General review SSI3a

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General review SSI3a
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2011-06-16 23:53:06
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  1. 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
  2. High Expansion foams
    • i) Are limited to a deluge system
    • ii) Installed in Aircraft hangars
    • iii) Expansion rates of 2%, 2.5%, 2.75%
  3. E.S.F.R Heads
    Need to be installed under ducts over 2’
  4. Max temperature of water in a sprinkler system:
    120 F or 49 C
  5. Min size of Aux Drain:
    Minimum size is ½”
  6. 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
  7. Max coverage area for any 1 head:
    400 ft
  8. Can a Double-interlock preaction system be gridded?
    No
  9. C02 Systems:
    • Pipe and fittings up to ¾” are schedule 40 galvanized
    • ¾”-2” are schedule 80
    • Over 2” fittings are galvanized forged steel
  10. 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%
  11. 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?
  12. Water Motor Gong
    • No farther than 75’ away from the valve
    • No higher than 20’
  13. Fire hydrant hose connection must be ___ from the ground?
    18"
  14. Area of a triangle:
    (Base X height)/2
  15. ABC regarding Trenches:
    A ladder is required in a trench when it is 5’ or deeper. The ladder must extend 3’ above the trench
  16. Minimum thickness of metal you can use a power driven stud on?
    3/16”
  17. 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
  18. Halon NFPA 12A
    • Warning signs must be inside and outside of area protected with halon
    • Not allowed to deviate from engineered design
    • Test semi-annually
    • Tanks must be refilled if they lose more than 5% of the volume
  19. High pressure cylinders:
    • Testing: semi-annually
    • Refill if pressure dropped 10%
  20. High pressure systems:
    Tested every 5 years but if not used and still in service it can be extended to 12 years
  21. Manual Pull Stations:
    • No higher than 4’ from grade
    • Halon pull station no higher than 5’
    • Max travel: 14”
    • 40 psi pulling force
  22. Fixed water spray systems:
    Min. Sizes of pipe, steel is 1” and copper is 3”
  23. Max discharge rate of a fixed water spray system?
    Single system not exceeding 3,000 GPM
  24. Can a single water supply feed more than one fixed water spray system?
    YES
  25. Fixed water spray systems:
    • Max 500 gallons per control valve
    • Water supply must last 15 minutes
  26. If connecting antifreeze system to a potable water supply use:
    Propylene-glycol
  27. Flushing requirements:
    • Min size of flushing connection: 1 ¼”
    • Min size for flushing city water supply: 2”
  28. When are local alarms not required?
    When there are less than 20 sprinkler heads
  29. Small orifice heads:
    3/8”, need a strainer
  30. 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
  31. Primary design of aFixed water spray systems:
    To protect the equipment 1st, then the structure
  32. Most effective dry chemical:
    Urea potassium bicarbonate
  33. When is a QOD required on a Dry valve:
    system is greater than 500 gallons
  34. Clean out on CO2 system:
    Needs to be 2” long and same diameter as piping. (nipple-cap)
  35. 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)
  36. Fixed water spray systems:
    • No bushings allowed
    • Max nozzle spacing is 10 feet
  37. Drain sizes:
    • 4” and larger: 2” drain
    • 2 ½” – 3 ½”: 1 ¼” or larger
    • Up to 2”: ¾” or larger
  38. Fixed water spray systems:
    You can use copper if pressure does not exceed 175 psi
  39. Electronic monitoring
    Every electronic device has a microswitch AKA Tamper switch
  40. Foam Generators
    • Aspirator type:
    • Produce foam with expansion ratios not over 250:1
    • Blower: 250-1000
  41. Foam types
    • Low Expansion
    • 2-20
    • Medium expansion
    • 20-200
    • High Expansion
    • 200-1000
  42. 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
  43. Water supply (Durations and Densities)
    • Light Hazard: 100 GPM for 30 minutes
    • Ordinary Hazard: 250 GPM for 60-90 minutes
    • Extra Hazard: 500 GPM for 90-120 minutes
  44. Metric to Imperial conversions:
    • Feet of pipe/3.28= meters
    • Meters of pipe X 3.28= Feet
  45. Foam/water spray system
    The smallest permissible Discharge orifice is:
    ¼”
  46. Airplane Hangar Doors
    • Class 1: Over 28’
    • Class 2: Less than 28’
  47. Dry System
    Most common problem when water is coming out of the ball drip:
    The clapper is not seated
  48. NFPA standard regarding Low, medium, and high Expansion Foam is:
    NFPA 11
  49. Restrictions to type of piping and fittings used on a foam system:
    Can't use galvanized pipe or fittings
  50. Extra Hazard (Group II)
    Max time for water delivery in extra hazard (group II) is:
    45 seconds
  51. Can a dry system be gridded?
    No
  52. Minimum pipe schedule to be used for sway bracing?
    Schedule 30
  53. Dry Chemical systems:
    The expellant nozzle needs to be 20 pipe diameters away from the 90
  54. Foam systems:
    Need to be pre-primed and flushed annually
  55. 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
  56. Clean Agent:
    Exposure Limits:
    • 9% concentration: no longer than 5 minutes
    • Greater than 11%: No longer than 1 minute
  57. 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
  58. Fire Pump testing
    Under no flow:
    • Electric: monthly for 10 minutes
    • Diesel: weekly for 30 minutes
  59. 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
  60. Tube Bending (diameter of bend):
    2” or smaller has a diameter of 6 pipe diameters 2 ½” or larger is 5 pipe diameters
  61. Flushing Requirements of Underground Piping:
    • 4” 390 GPM
    • 6” 880 GPM
    • 8” 1560 GPM
  62. 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
  63. ABC method of testing a dry valve:
    • Lock the clapper open
    • Plug the autodrip
  64. 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
  65. 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”

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