Transcript Developing Effective Water Supply

HOUSTON FIRE DEPARTMENT
HH
PUMP OPERATOR PROGRAM
VAL JAHNKE TRAINING FACILITY
First Arriving Engine
• May start developing water supply
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Consider fire load
Consider fire conditions
Next company arrival time
Consider nearest water source
Consider driveways or dead ends
Inform next company of actions needed
(forward or reverse lay)
– Communicate GPM flow to supply company(s)
Supply Engine(s)
• Use side intakes only
– Avoid rear intake (restrictive)
• 3rd LDH line in could use rear intake
• Multiple lines from hydrant to engine
– 6” soft suction attached to steamer
– adapt 2 1/2” to 4” at hydrant (both if necessary)
• use water thief(s)
– Will need 2 1/2” female to 4” male adapters
Supply Engine(s)
• Water flow from 2 1/2” pump discharge
– Over 1,000 gpm
– 2” tip @ 80 psi delivers 1,000 gpm
• Dual lines between engines
– Reduces gpm flow in hose by half
– Greatly reduces friction loss in hose
• Engine Pressure
– E.P. = T.F.L. + 20 (50)
Relay
• Supply engine
– Starts water flow
– Maintains correct engine pressure
• Intermediate engine(s)
– Should be pumping same as supply engine if
hose lay is the same
• Attack engine
– Different engine pressure
– Pressure for individual lines (hand or master)
Relay
• After water supply is established
– Set governor or relief valve
• Shut down of relay
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Reverse order
Attack engine first
Intermediate next
Supply engine last
Dump and Relief Valves
• Dump valve(s) operating
– Check incoming pressure
– Do not cap
– If capped, loss of pump protection
• Relief valve(s) operating
– Check incoming pressure
– May need adjusting
Reverse Lay
• Advantages
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Crew left at fire scene
Additional manpower
2 in / 2 out
Supply engine spots at hydrant
Hydrant supply not interrupted
Ladder Pipe Operations
• Newer apparatus have flow meters
– E-One trucks
– Needs approximately 200 psi at base of truck
– LTI uses PDP (predetermined pressure)
• FY 2000 platform and ladders
– Will be setup to deliver 1500 gpm
– Will have siamese for dual 4” supply laid to
truck
Ladder Pipe Operations
• Need engine spotted within 100’ of ladder
truck
– Engine may need dual lines laid into side
intakes depending on length of line from supply
engine
– Supply engine at hydrant with 6” soft suction
and possibly second 4” from same hydrant
Supplemental Pumping
L93
E61
E70
E52
Standpipe/Sprinkler
• High failure rate of piping between the FDC
and the standpipe riser
• There are a few sprinklers on a separate
riser, with a separate FDC
• Very tall buildings are divided into two or
more vertical zones
Non-PRV Systems
• Standpipe systems
– Fog nozzles at 150 psi + 5 psi/floor to the fire
floor
– 2 1/2” straight streams at 65 psi + 5 psi/floor to
the fire floor
• Sprinklers at 150 psi + 5 psi/floor to the fire
floor
PRV Systems
• Engines should supply the systems only if
the building’s fire pumps are not
functioning adequately
• The designed system pressure must be
supplied (information in high rise survey)
• Standpipe & sprinklers are calculated the
same on PRV systems
Tandem Pumping
• Is a short relay for high rise buildings (this
will be a high pressure operation)
• Becomes necessary after 40 stories (roughly
300 psi)
• High pressure engine reverse lays from the
FDC to an safe area (falling glass)
• Supply engine will reverse lay to the
hydrant
Large Volume Hand Lines
LDH to Ground Monitor
3” to Ground Monitor
LDH to Ground Monitor
FYI
• Centrifugal pump
– Can double its capacity with positive pressure
supply (hydrant system)
• Staged engines
– May need to share adapters
– Used to lay second line (forward or reverse)
HOUSTON FIRE DEPARTMENT
HH
PUMP OPERATOR PROGRAM
VAL JAHNKE TRAINING FACILITY