Hydraulics
Home > Flashcards > Print Preview
The flashcards below were created by user
cop121
on
FreezingBlue Flashcards. What would you like to do?

FL (Friction Loss) =
((GPM X N)/1010) per 100' of Hose

PDP (Pump Discharge) =
NP+FL+APP+/ELEV
Nozzle Pressure+Friction Loss+Appliance+orElevation

What is "N" in the Friction Loss Formula
N is a numeric value determined by the size of the hose line.
 4 = 1 1/2"
 3 = 1 3/4"
 2 = 2"
 1 = 2 1/2"

1 3/4 150 GPM = __ NP
50 NP


1 3/4 225 GPM = __ NP
100 NP

1 3/4 250 GPM = __ NP
125 NP

2 1/2 250 GPM = __ NP
50 NP

2 1/2 300 GPM = __ NP
75 NP

2 1/2 350 GPM = __ NP
100 NP

2 1/2 400 GPM = __ NP
125 NP

What is the PDP of 150 GPM on 1 3/4 150' AL
102.5 PDP

What is the PDP of 200 GPM on 1 3/4 150' AL
150 PDP

What is the PDP of 225 GPM on 1 3/4 150' AL
186.25 PDP

What is the PDP of 250 GPM on 1 3/4 150' AL
222.5 PDP

What is the PDP of 150 GPM on 1 3/4 200' AL
120 PDP

What is the PDP of 200 GPM on 1 3/4 200' AL
175 PDP

What is the PDP of 225 GPM on 1 3/4 200' AL
215 PDP

What is the PDP of 250 GPM on 1 3/4 200' AL
255 PDP

What is the PDP of 250 GPM on 2" 200' AL
80 PDP

What is the PDP of 300 GPM on 2" 200' AL
115 PDP

What is the PDP of 350 GPM on 2" 200' AL
150 PDP

What is the PDP of 400 GPM on 2" 200' AL
185 PDP

What is the formula used to calculate friction loss for a supply line?
Q X (Q1) / 4

Q X (Q1) / 4
Formula used to calculate supply line friction loss

How is "Q" determined in the supply line friction loss formula
Q = GPM / 100

1 3/8 Tip = __ GPM
500 GPM

1 5/8 Tip= __ GPM
700 GPM

1 7/8 Tip= __ GPM
900 GPM


Nozzle Pressure on Smooth bore Tips is?
80NP for all tips 1 3/8 or greater and 50NP for tips 1 1/4 and smaller

What is the Nozzle PSI for a smoothbore Handline?
50 PSI

What is the Nozzle PSI for a Fog Nozzle?
100 PSI

What is the Nozzle PSI for a Master Stream?
80 PSI

Stang Guns PSI
 EOne 0 PSI
 Salsbury 15 PSI
 Commercial Cab 15 PSI

Portable Monitors PSI
 Elkhart 0 PSI
 Others 15 PSI

Sprinklers
 Fire Showing 150 PSI
 No Fire Showing 0 PSi

Other Appliances
 Wye/Siemese Flow >350 GPM 10 PSI
 Wye/Siemese Flow <350 GPM 0 PSI
 Standpipe Flow >350 GPM 20 PSI
 Standpipe Flow <350 GPM 0 PSI

Ladder Ops
 Ladder 191 = 45 PSI
 Unknown Ladder = 45 PSI
 Add 5 PSI+/ every 10' of elevation
 If unknown assume 65'
 *Tip Divide total height by 2
 Ex 80' Elevation is 40 PSI

How to cool a Hot Pump
 Open a nozzle
 Open a discharge
 Stick an open red line into tankfill opening

How to cool a Hot Engine
 Fog spray under truck in front of the radiator
 Fog spray directly on radiator
 Open engine caulings to increase air flow
 Open engine auxillary cooler

What is cavitation
Air Bubbles in Pump/an increase in RPM w/o an increase in PDP

Cavitation Indicators
 Sudden Loss of Pressure
 An increase in pump speed w/out corresponding increase in pump pressure
 Vibration
 Sounds like gravel going through the pump

Relay Pumping
 PDP = FL + 20
 Calculate forward pumper GPM and calculate FL for the supply line add 20 PSI

Multi Supply Lines  Same Length
Divide total flow by # of lines. Calculate Friction Loss. Total flow / # of lines

Multi Supply Lines  Different Length
Add length of all lines, divide total length by # of lines. Calculate Friction Loss using resulting length.

Max hose pressure, handline = __ GPM
250 PSi

Max hose pressure, Jacketed (Ladder) = __ GPM
250 PSI

Max hose pressure, 4" nonjacketed = __ GPM
180 PSI

Hydrant Flow (Static/Residual)
 010% drop 3 X current Flow
 1115% drop 2 X current flow
 1625% drop 1 X current flow
 26% or more is < current flow
*Tip determine 10%, then add 1/2 that number for 15% then add the entire # for 25%
 Ex. Static pressure is 80.
 10% is 8
 15% is 12
 25% is 20

Cavitation Prevention and Correction
 Maintain a minimum of 20PSi intake pressure
 Reduce pump speed
 improve water supply

Foam PDP is __
100 PDP. foam is always 100 PDP!