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MFMD Hydraulics > General Hydraulics > Flashcards

General Hydraulics Flashcards

1
Q

Nozzle Pressure (NP)

  • solid master
  • solid handline
  • fog master
  • fog handline
A 
Solid master  - 80
solid handline  - 50
fog master  - 100
fog handline  - SM20LP -75
                       - elkhart/fog/ 100 - card
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2
Q

When does FL in an appliance come into effect?

A

When GPM are equal to or greater than 350 GPM

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3
Q

FL in reducers and gated wyes when flowing over 350 GPM?

A

10 PSI FL

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4
Q

FL from monitors, deck guns, and standpipes/ladders?

A

25 PSI FL

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5
Q

Rule of 8’s?

A 
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
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6
Q

Friction Factors

1”, 1 3/4”, 2 1/2”, 2 x 2 1/2”, 5”

A 
1"   -97
1 3/4"  -8
2 1/2"  -1
2 x 2 1/2"  - 0.25
5"   - 0.03
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7
Q

Elevation Loss (EL)

A

(+/-) 5 PSI per floor

(+/-) 1/2 of elevation

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8
Q

Attack pack pump discharge pressure (PDP)?

A

100’ - 100 PSI

200’ -120 PSI

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9
Q

Pump discharge pressure is the result of what four factors?

A

NP + FL + AP +/- EL

*not to exceed 200PSI

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10
Q

Friction loss equation

A

FL=2Q(2)xFxL

Q=GPM/100
F=friction factor
L=length/100

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11
Q

FL per 100’ of 5”

A 
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

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12
Q

Hydrant performance-

residual drops 0-10%

A

3 x current volume

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13
Q

Hydrant performance-

residual drops 11-15%

A

2 x current volume

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14
Q

Hydrant performance-

residual drops 16-25%

A

1 x current volume

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15
Q

Hydrant performance-

residual drops 25+%

A

No additional GPM

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16
Q

GPM for solid handline

  • 1”
  • 1 1/8”
  • 1 1/4”
A
  • 1” 200 GPM
  • 1 1/4” 250 GPM
  • 1 1/2” 300 GPM
17
Q

FL per 100’ of 2 1/2”

A 
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
18
Q

sequence when putting initial line into service

A 
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
19
Q

After each evolution be ready for…

A 
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
20
Q

Broken handline?

A

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
21
Q

Supply line failure

A

Emergency traffic
switch to tank water
reduce protection lines to preserve interior lines
reduce pressure if possible

22
Q

Catastrophic engine/pump failure

A

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

23
Q

High Engine Temp

A 
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
24
Q

Cubic foot of water weighs how much?

A

62.5 lbs

25
Q

How many pounds in a gallon?

A

8.33 pounds

26
Q

How many gallons in a cubic foot?

A

7.49 gallons

27
Q

Pressure per foot of elevation?

A

.434 PSI

28
Q

formula for volume?

A

Pi X Radius squared X height

MFMD Hydraulics (2 decks)

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