Hydraulics

Question 1

What’s the formula to calculate Engine Pressure

Answer 1

EP= NP + FL + A +- H

Question 2

Reel Line-
1 1/2 @ 95 gpm Jump Line-
1 3/4 @ 150 gpm red and green line
1 3/4 @ 185 gpm blue line
Dead Load-
Deck Gun-
Sprinkler System-
Relay Pumping-

Answer 2

Reel- 100 psi

Red / Green- 125 psi

Blue - 125 psi

Dead Load- 175

Deck Gun 115 psi, 95 psi

Sprinkler 150 psi

Relay- 75 psi

Question 3

Formula for Calculating Friction Loss

Answer 3

2Q(squared)L

Q = quantity of water or GPM

L = Length

Based on a 100’ length of 2 1/2 then multiplied by correct hose factor

Question 4

Fog Nozzle GPM Factors

20
60
95
125
150
200

Answer 4

.08
.75
2
3
4
8

Question 5

Standard Fog GPM Factors

250
300
500
750
1000

Answer 5

12
18
50
112
200

Question 6

Smooth Bore
Tip - GPM - Factor
3/8 
1/2 
5/8 
15/16 
1 
1 1/8 
1 1/4 
1 3/8 
1 1/2 
1 3/4 
2

Answer 6

GPM - Factor
3/8 - 30    - .2
1/2 - 50     - .5
5/8 - 80    - 1
15/16 - 185 - 7
1 - 200 - 8
1 1/8 - 250 - 12
1 1/4 - 325 - 21
1 3/8 - 500 - 50
1 1/2 - 600 - 72
1 3/4 - 800 - 128
2 - 1000 - 200

Question 7

Hose Factors

Diameter

1 1/2

1 3/4

2 1/2

3

4

Answer 7

Diameter Single Double

1 1/2 12

1 3/4 6 1.5

2 1/2 1 .25

3 .4 .1

4 .1

Question 8

Appliance Friction Loss

Wye Siamese

Portable Monitor

Deck Gun

Standpipe

In-Line Foam Eductor

Answer 8

Wye Siamese 10

Portable Monitor 15

Deck Gun 15

Standpipe 25

In-Line Foam Eductor 200 at the eductor

Question 9

Aerial Apparatus Pressure

Answer 9

Both Trucks

180 psi plus Friction Loss of hose on the ground

Question 10

Monitor Pressures

Fog

Tip

Answer 10

Fog 100 psi

Tip 80 psi