1 / 11

Lewis County Fire District 13

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:

clare
Download Presentation

Lewis County Fire District 13

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lewis County Fire District 13 Introduction to Basic Hydraulics

  2. Need to Know… PSI Pounds per Square Inch GPM Gallons Per Minute NP Nozzle Pressure EP Engine Pressure F/L Friction Loss

  3. 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

  4. 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

  5. For Example 100’ of 1-3/4” Hose GPM F/L 100 10 150 25 200 40

  6. 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

  7. 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

  8. 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’

  9. 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

  10. 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

  11. 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

More Related