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Questions and Answers
What is the maximum flow for a Blitz Fire stream?
What is the maximum flow for a Blitz Fire stream?
- 500 GPM (correct)
- 600 GPM
- 400 GPM
- 750 GPM
Which hose size has the highest friction loss for a flow of 200 GPM?
Which hose size has the highest friction loss for a flow of 200 GPM?
- 2-1/2" ECO-10 Hose
- 1-3/4" Hose (correct)
- 1-1/4" Key Combat Hose
- 5" Hose
What is the pressure required for a master stream with a stack tip of 80 PSI?
What is the pressure required for a master stream with a stack tip of 80 PSI?
- 75 PSI
- 100 PSI
- 80 PSI (correct)
- 50 PSI
For a 3" hose, what is the friction loss at a flow rate of 325 GPM?
For a 3" hose, what is the friction loss at a flow rate of 325 GPM?
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Which tip size produces the highest flow rate in the Master Streams table?
Which tip size produces the highest flow rate in the Master Streams table?
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Which type of hose has a friction loss of only 5 PSI at a flow of 250 GPM?
Which type of hose has a friction loss of only 5 PSI at a flow of 250 GPM?
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What is the friction loss for a flow of 400 GPM?
What is the friction loss for a flow of 400 GPM?
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What is the flow rate of the Elkhart Brass Scorpion fog nozzle?
What is the flow rate of the Elkhart Brass Scorpion fog nozzle?
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Study Notes
Master Streams
- Master stream tip sizes and corresponding flow rates (GPM):
- 1-3/8" -> 500 GPM
- 1-1/2" -> 600 GPM
- 1-3/4" -> 800 GPM
- 2" -> 1000 GPM
- Operating pressure for master stream stack tip is 80 PSI.
Blitz Fire
- Blitz fire tip sizes and GPM:
- 1" -> 250 GPM
- 1-1/4" -> 400 GPM
- 1-1/2" -> 600 GPM
- Maximum flow set at 500 GPM.
Handline 3" Hose
- Handline tip sizes and GPM:
- 1" -> 200 GPM
- 1-1/8" -> 250 GPM
- 1-1/4" -> 325 GPM
- Handline stack tip operates at 50 PSI.
Friction Loss in Hose
- Calculated per 100 feet of hose.
- 1-3/4" hose friction loss:
- 95 GPM -> 15 PSI
- 125 GPM -> 25 PSI
- 150 GPM -> 35 PSI
- 200 GPM -> 60 PSI
- 1-1/4" Key Combat Hose friction loss:
- 95 GPM -> 5 PSI
- 125 GPM -> 10 PSI
- 150 GPM -> 15 PSI
- 200 GPM -> 30 PSI
- 2-1/2" ECO-10 Hose friction loss:
- 250 GPM -> 10 PSI
- 300 GPM -> 20 PSI
- 350 GPM -> 25 PSI
- 500 GPM -> 50 PSI
- 3" Hose friction loss:
- 250 GPM -> 5 PSI
- 325 GPM -> 10 PSI
- 500 GPM -> 20 PSI
- 5" Hose friction loss:
- 750 GPM -> 5 PSI
- 1000 GPM -> 10 PSI
- 1250 GPM -> 15 PSI
- 1500 GPM -> 20 PSI
Fog Nozzles
- Common fog nozzle specifications:
- 1-3/4" Akron -> 200 GPM at 100 PSI
- 1-3/4" Metro 1 -> 150 GPM at 75 PSI
- 2-1/2" Metro 2 -> 250 GPM at 50 PSI
Ladder 34 Elevated Master Stream
- Uses Elkhart Brass Scorpion 3-1/2 fog nozzle, rated at 1250 GPM at 75 PSI.
Appliance Loss
- 0 PSI for flows below 350 GPM.
- 10 PSI for flows over 350 GPM (applies to reducers, gates, wyes, water thief, manifolds).
- 25 PSI for master streams at or above 350 GPM (deck gun, ground monitor, blitz fire).
Elevation Loss
- Loss of 5 PSI per 10 feet after the first floor.
- Standpipes and sprinklers require an initial 150 PSI plus 5 PSI for each additional floor.
Other Calculations
- Engine pressure formula: EP = FL + NP + AL + EL
- 5" hose calculation: holds 1 gallon per foot (e.g., 400' hose = 400 gallons).
Key Abbreviations
- NP = Nozzle pressure
- FL = Friction loss
- AL = Appliance loss
- EL = Elevation loss
- EP = Engine pressure
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