Intermediate SFFMA Objectives:12-02.01 – 12-02.06 4Hrs received.
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Transcript of Intermediate SFFMA Objectives:12-02.01 – 12-02.06 4Hrs received.
Water SupplyIntermediate
SFFMA Objectives:12-02.01 – 12-02.064Hrs received
SFFMA Objectives 12-02.01 Trainee shall identify the following types of water main valves: A.
indicating C. post indicators B. non-indicating D. outside screw and yoke 12-02.02 Trainee shall identify hydrant usability by:
A. obstruction to use of hydrant B. direction of hydrant outlets to suitability of use operating the hydrant C. mechanical aboveground damage D. condition of paint for rust and corrosion E. the flow by fully F. the ability to drain
12-02.03 Trainee shall define, explain, and demonstrate where applicable, the use of a rural dry fire hydrant system and static water supply source.
12-02.04 Trainee shall define a tanker shuttle. 12-02.05 Trainee shall identify the apparatus, equipment, and appliances
required to provide water at rural locations by relay pumping, large diameter hose, or a tanker shuttle.
12-02.06 Trainee shall demonstrate deployment of a portable water tank.
Firefighter II
Water Main ValvesProvide means for controlling flow of water
through distribution pipingShould be located at frequent intervals in
grid system so only small sections are cut off if necessary to isolate parts of system for repairs
12–3
(Continued)
Firefighter II
Water Main Valves
12–4
(Continued)
Firefighter II
Water Main ValvesSpacing should be such that only minimum
length of pipe is out of service at any timeShould be operated at least once/year to keep
workingWater department should be able to open
valves promptly when needed
12–5
(Continued)
Firefighter II
Water Main ValvesIndicating valves
Show position of gate or valve seat
Includes most valves in fire protection systems
Post indicator valves (PIVs)Outside stem and yoke
(OS&Y) valves
12–6
(Continued)
Water Main ValvesOS&Y Valve (Outside stem and yoke)
A type of control valve for a sprinkler system in which the position of the center screw indicates whether the valve is open or closed
Post Indicating ValveValve type used to control underground water
mains that provides visual means for indicating “open” or “shut”
Firefighter II
Water Main ValvesNonindicating valves
Normally buried/installed in utility manholes
Can be operated aboveground through valve box or may need special socket wrench on end of reach rod
12–8
(Continued)
Firefighter II
Water Main ValvesControl valves
Can be indicating or nonindicating types
Gate valvesButterfly valves
12–9
(Continued)
Firefighter II
Water Main ValvesProper valve installation (spacing)
Necessary to close off one or two hydrants from service while single break in main is being repaired
Advantages reduced if all valves not properly maintained and kept open
12–10
Firefighter II
Water MainsGenerally made of cast iron, ductile iron,
asbestos cement, steel, PVC, plastic, or concrete
Must be proper type for soil conditions, and pressures to which will be subjected
12–11
(Continued)
Firefighter II
Water MainsWater flow may be resisted by internal
surface of pipe, encrustations, solidified sediments
12–12
Firefighter II
PressureForce per unit areaForce that moves water through conduitMeasured in pounds per square inch (psi) or
kilopascals (kPa)
12–13
Firefighter II
Static PressureWhen little or no water
flow, pressure that can be measured is static pressure
Rarely found in public water supply system
12–14
(Continued)
Firefighter II
Static PressureDefined in this context as normal pressure
existing on system before water released from hydrant
12–15
Firefighter II
Flow PressureForward velocity pressure at discharge
opening while water flowingCan be measured with pitot tube and gauge
12–16
Firefighter II
Residual PressureRepresents pressure left in system at specific
location when water flowing
12–17
(Continued)
Firefighter II
Residual PressureThat part of total available pressure not used
to overcome friction/gravity while forcing water
Provides indication of availability of additional water
12–18
Firefighter I
Dry HydrantsInstalled at static water sources to increase
water supply availableUsually constructed of steel or PVC pipe with
strainers at water source, steamer ports to connect to pumper
Designed to supply at least 1,000 gpm (4 000 L/min)
12–19
(Continued)
Firefighter I
Water ShuttlesInvolve hauling water from supply source to
portable tanks from which water may be drawn to fight fire
Recommended for distances greater than ½ mile (0.8 km) or greater than the fire department’s capability of laying supply hoselines
12–20
(Continued)
Firefighter I
Water ShuttlesCritical elements
Fast-fill, fast-dump capabilitiesWater supply officers at fill/dump sitesTraffic controlHydrant operationsHookupsTank venting
12–21
Firefighter I
Water ShuttlesKey componentsDump sitePortable tanks
12–22
(Continued)
Firefighter I
Water ShuttlesWays in which water
tenders unloadGravity dumpingJet dumps that increase
flow rateApparatus-mounted pumpsCombination of these
methods
12–23
(Continued)
Firefighter I
Water ShuttlesAccording to NFPA® 1901, water tenders on
level ground should be capable of dumping/filling at rates of at least 1,000 gpm (4 000 L/min)
12–24
(Continued)
Firefighter I
Water ShuttlesTo fill water tenders quickly, use best fill site,
large hoselines, multiple hoselinesMultiple portable pumps may be necessary
12–25
Firefighter I
DISCUSSION QUESTION
What are the advantages and disadvantages of a water shuttle operation?
12–26
Firefighter I
Relay PumpingCan be used in situations where water source
is close enough to fire scene to render water shuttles unnecessary
Factors to considerWater supply must be capable of maintaining
desired volume of waterRelay must be established quickly
12–27
(Continued)
Firefighter I
Relay PumpingDetermining number of pumpers needed and
distance between themSeveral factors to take into accountApparatus with greatest pumping capacity
should be at water source
12–28
(Continued)
Firefighter I
Relay PumpingDetermining number of pumpers needed and
distance between them Large-diameter hose or multiple hoselines
increase distance, volume a relay can supplyWater supply officer should consider all factors
and determine correct distance
12–29
Practical ExerciseFirefighter shall:
Identify apparatus, equipment, and appliances required to provide water at rural locations by Relay pumping or Large diameter hose or Tanker shuttle
Firefighter shall:Demonstrate deployment of a portable water
tank