Friction Loss and Engine Pressures Quiz

Master Streams

• Master stream tip sizes range from 1-3/8" to 2", with corresponding flow rates from 500 GPM to 1000 GPM.
• For master streams, a stack tip pressure of 80 PSI is required.

Blitz Fire

• Available tip sizes for Blitz Fire range from 1" to 1-1/2", with flows from 250 GPM to 600 GPM.
• Maximum flow for Blitz Fire is capped at 500 GPM.

Handline 3" Hose

• Handline 3" hose configurations feature tip sizes of 1" to 1-1/4", delivering flows between 200 GPM and 325 GPM.
• A stack tip pressure of 50 PSI is necessary for handlines.

Friction Loss (FL) Tables

• Friction loss is calculated per 100 feet of hose used, affecting water pressure based on GPM:
  • For 1-3/4" hose:
    • 95 GPM = 15 PSI
    • 200 GPM = 60 PSI
  • For 1-1/2" Key Combat hose:
    • 200 GPM = 30 PSI
  • For 2-1/2" ECO-10 hose:
    • 500 GPM = 50 PSI
  • For 3" hose:
    • 500 GPM = 20 PSI
  • For 5" hose:
    • 1500 GPM = 20 PSI

Engine 288 Fog Nozzles

• Fog nozzle options include:
  • 1-3/4" Akron: 200 GPM at 100 PSI
  • 1-3/4" Metro 1: 150 GPM at 75 PSI
  • 2-1/2" Metro 2: 250 GPM at 50 PSI
• Ladder 34's elevated master stream uses Elkhart Brass Scorpion nozzle: 1250 GPM at 75 PSI.

Appliance Loss

• Friction loss is zero for flows less than 350 GPM; it increases to 10 PSI for flows greater than 350 GPM.
• A friction loss of 25 PSI applies to all master streams flowing 350 GPM or more.

Elevation Loss

• Loss due to elevation is calculated at 5 PSI for every 10 feet above the first floor.
• Relay pumping incurs 20 PSI plus friction loss.
• Standpipes/sprinklers require 150 PSI plus 5 PSI for each additional floor.

Key Abbreviations and Formula

• Key terms:
  • Nozzle Pressure (NP)
  • Friction Loss (FL)
  • Appliance Loss (AL)
  • Elevation Loss (EL)
  • Engine Pressure (EP)
• Formula to calculate engine pressure:
  • EP = FL + NP + AL + EL