General Hydraulics Flashcards
Nozzle Pressure (NP)
- solid master
- solid handline
- fog master
- fog handline
Solid master - 80
solid handline - 50
fog master - 100
fog handline - SM20LP -75
- elkhart/fog/ 100 - cardWhen does FL in an appliance come into effect?
When GPM are equal to or greater than 350 GPM
FL in reducers and gated wyes when flowing over 350 GPM?
10 PSI FL
FL from monitors, deck guns, and standpipes/ladders?
25 PSI FL
Rule of 8’s?
Using tip size numerator in 1/8's. 1 1/4 -400 1 3/8 -500 1 1/2 -600 1 5/8 - 700 1 3/4 - 800 1 7/8 - 900 2 - 1000
Friction Factors
1”, 1 3/4”, 2 1/2”, 2 x 2 1/2”, 5”
1" -97 1 3/4" -8 2 1/2" -1 2 x 2 1/2" - 0.25 5" - 0.03
Elevation Loss (EL)
(+/-) 5 PSI per floor
(+/-) 1/2 of elevation
Attack pack pump discharge pressure (PDP)?
100’ - 100 PSI
200’ -120 PSI
Pump discharge pressure is the result of what four factors?
NP + FL + AP +/- EL
*not to exceed 200PSI
Friction loss equation
FL=2Q(2)xFxL
Q=GPM/100
F=friction factor
L=length/100
FL per 100’ of 5”
GPM-----FL 400 1 500 1.5 600 2 700 3 750 3.5 (FOG) 800 4 900 5 1000 6
Starts at 1 PSI FL at 400 GPM to 6 PSI at 1000 GPM
Hydrant performance-
residual drops 0-10%
3 x current volume
Hydrant performance-
residual drops 11-15%
2 x current volume
Hydrant performance-
residual drops 16-25%
1 x current volume
Hydrant performance-
residual drops 25+%
No additional GPM
GPM for solid handline
- 1”
- 1 1/8”
- 1 1/4”
- 1” 200 GPM
- 1 1/4” 250 GPM
- 1 1/2” 300 GPM
FL per 100’ of 2 1/2”
GPM-----FL 100 2 150 4.5 * 200 8 * 250 12.5 * 300 18 * 400 32 500 50 600 72 700 98 800 128 900 162 1000 200
sequence when putting initial line into service
Air Brake Neutral pump gear put into drive Wheel chock tank to pump tank fill prime loosen keystone vent switch to pressure foam on (if requested) compressor on (if requested) bed clear FF ready open valve adjust pressure CAF's switch on (if requested) and remove nozzle check for kinks pull 5" supply connect to keystone supply line and wrench to hydrant flush hydrant connect to hydrant open fully- no water hammer! bring to curb bleed off air close keystone vent open keystone slowly- no PSI jumps over 5 PSI confirm pressure mark pressure and GPM with grease pencil close to crack tank fill and tank to pump grease pencil all gauges verbalize residual -check every evolution -confirm residual -confirm PDP -confirm GPM -confirm TTL GPM ready for next problem
After each evolution be ready for…
next line piercing nozzle roof ladder attic ladder RIC line pull pre-plan forcible entry monitor gauges bottles fan utilities Don turnouts/SCBA tools cones secure scene ice chest
Broken handline?
Is it a FF safety issue?
- If yes then call Emergency traffic
- notify command and give time frame
- replacement line *shut downline to replace line or section
- shorten the broken line
- replace the broken line
- recalculate the pressure
Supply line failure
Emergency traffic
switch to tank water
reduce protection lines to preserve interior lines
reduce pressure if possible
Catastrophic engine/pump failure
Emergency traffic-remove crews from hazard zone
use hydrant pressure to keep critical lines with water
shut down all non-critical lines
notify command to replace pumper
call on-duty mechanic
update repair log
fill out repair request
High Engine Temp
Engine cooler open? radiator blocked or leaking? Broken fan belt? -clear radiator of obstruction -flow redline into radiator -put fan in front of radiator -notify command it may be necessary to replace pumper
Cubic foot of water weighs how much?
62.5 lbs
How many pounds in a gallon?
8.33 pounds
How many gallons in a cubic foot?
7.49 gallons
Pressure per foot of elevation?
.434 PSI
formula for volume?
Pi X Radius squared X height
