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Lewis County Fire District 13. Introduction to Basic Hydraulics. Need to Know…. PSI Pounds per Square Inch GPM Gallons Per Minute NP Nozzle Pressure EP Engine Pressure F/L Friction Loss. Friction Loss???. Friction Loss:

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Lewis county fire district 13

Lewis County Fire District 13

Introduction

to

Basic Hydraulics


Need to know
Need to Know…

PSI Pounds per Square Inch

GPM Gallons Per Minute

NP Nozzle Pressure

EP Engine Pressure

F/L Friction Loss


Friction loss
Friction Loss???

Friction Loss:

Is the loss of energy (pressure) due to friction. Results from the turbulence of the water rubbing on the inner wall surface of the hose


Why is this important
Why is this IMPORTANT !!!

As the GPM increase so will the Friction Loss (Turbulence)

For Example 100’ of 3-1/2” Hose

GPM F/L

300 3

400 5

500 9

600 12

700 17

800 21

900 28

1000 34

1250 53

1500 77

1750 103


For example 100 of 1 3 4 hose
For Example 100’ of 1-3/4” Hose

GPM F/L

100 10

150 25

200 40


For example 100 of 2 1 2 hose
For Example 100’ of 2-1/2” Hose

GPM F/L

100 1

150 3

200 7.5

250 12.5 (10)

300 18 (20)

400 32

500 50


Commit to memory
Commit to Memory…

Combination Nozzle @ 100 PSI NP

1-3/4” Pre-Connect (200’ @ 150 GPM) EP =150 PSI

2-1/2” (100’ @ 250 GPM) *FIRE ATTACK* F/L = 10 PSI

2-1/2” (100’ @ 300 GPM) *EXPOSURE* F/L = 20 PSI

3-1/2” (100’ @ 500 GPM) F/L = 10 PSI

3-1/2” (100’ @ 1000 GPM) F/L = 35 PSI


Commit to memory1
Commit to Memory…

Combination Nozzle… 100 PSI

Solid Hand line… 50 PSI

Solid Master… 80 PSI

Minimum Intake Pressure… 20 PSI

Relay Intake Pressure… 50 PSI

Maximum Discharge Pressure… 250 PSI

(How Can We Overcome This?)

Head/Elevation Change Loss/Gain… 5 PSI per 10’


Remember
REMEMBER

  • When the lengths of the hose lines aren’t known, be conservative and “Pump High”

  • The person @ the nozzle has a bale & can gate down, until they can get on the radio & tell you to gate down @ the pump

  • Fire Attack Crew’s Lives are in YOUR HANDS


Want to know
Want To Know…

  • Needed Fire Flow? L X W Divided by 3

    (based off the % of involvement)

    (amount of water needed to control fire in 1 minute)

  • Total Water Needed to Extinguish ?

    L X W X 4 (based off the % of involvement)

  • 100’ of 3-1/2” hose holds… 25 Gal

    (1000’ of 3-1/2” holds 250 gallons)

  • 1 Gallon of water weighs… 8.34 Lbs


More want to know
More… *Want To Know*

Fire Pumps are Designed to Produce @ 150 PSI

150 PSI 100% Capacity

200 PSI 70% Capacity

250 PSI 50% Capacity

IMPORTANT !!!

A 3500 Gallon Tender with a 500 GPM Pump

Is

The Weakest Link


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