# Hydraulics

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1. FL (Friction Loss) =
((GPM X N)/10-10) per 100' of Hose
2. PDP (Pump Discharge) =
NP+FL+APP+/-ELEV

Nozzle Pressure+Friction Loss+Appliance+or-Elevation
3. What is "N" in the Friction Loss Formula
N is a numeric value determined by the size of the hose line.

• 4 = 1 1/2"
• 3 = 1 3/4"
• 2 = 2"
• 1 = 2 1/2"
4. 1 3/4 150 GPM = __ NP
50 NP
5. 1 3/4 200 GPM = __ NP
75
6. 1 3/4 225 GPM = __ NP
100 NP
7. 1 3/4 250 GPM = __ NP
125 NP
8. 2 1/2 250 GPM = __ NP
50 NP
9. 2 1/2 300 GPM = __ NP
75 NP
10. 2 1/2 350 GPM = __ NP
100 NP
11. 2 1/2 400 GPM = __ NP
125 NP
12. What is the PDP of 150 GPM on 1 3/4 150' AL
102.5 PDP
13. What is the PDP of 200 GPM on 1 3/4 150' AL
150 PDP
14. What is the PDP of 225 GPM on 1 3/4 150' AL
186.25 PDP
15. What is the PDP of 250 GPM on 1 3/4 150' AL
222.5 PDP
16. What is the PDP of 150 GPM on 1 3/4 200' AL
120 PDP
17. What is the PDP of 200 GPM on 1 3/4 200' AL
175 PDP
18. What is the PDP of 225 GPM on 1 3/4 200' AL
215 PDP
19. What is the PDP of 250 GPM on 1 3/4 200' AL
255 PDP
20. What is the PDP of 250 GPM on 2" 200' AL
80 PDP
21. What is the PDP of 300 GPM on 2" 200' AL
115 PDP
22. What is the PDP of 350 GPM on 2" 200' AL
150 PDP
23. What is the PDP of 400 GPM on 2" 200' AL
185 PDP
24. What is the formula used to calculate friction loss for a supply line?
Q X (Q-1) / 4
25. Q X (Q-1) / 4
Formula used to calculate supply line friction loss
26. How is "Q" determined in the supply line friction loss formula
Q = GPM / 100
27. 1 3/8 Tip = __ GPM
500 GPM
28. 1 5/8 Tip= __ GPM
700 GPM
29. 1 7/8 Tip= __ GPM
900 GPM
30. 2" Tip= __ GPM
1000 GPM
31. Nozzle Pressure on Smooth bore Tips is?
80NP for all tips 1 3/8 or greater and 50NP for tips 1 1/4 and smaller
32. What is the Nozzle PSI for a smoothbore Handline?
50 PSI
33. What is the Nozzle PSI for a Fog Nozzle?
100 PSI
34. What is the Nozzle PSI for a Master Stream?
80 PSI
35. Stang Guns PSI
• E-One 0 PSI
• Salsbury 15 PSI
• Commercial Cab 15 PSI
36. Portable Monitors PSI
• Elkhart 0 PSI
• Others 15 PSI
37. Sprinklers
• Fire Showing 150 PSI
• No Fire Showing 0 PSi
38. Other Appliances
• Wye/Siemese Flow >350 GPM 10 PSI
• Wye/Siemese Flow <350 GPM 0 PSI
• Standpipe Flow >350 GPM 20 PSI
• Standpipe Flow <350 GPM 0 PSI
• Ladder 191 = 45 PSI
• Unknown Ladder = 45 PSI

• Add 5 PSI+/- every 10' of elevation
• If unknown assume 65'

• *Tip Divide total height by 2
• Ex 80' Elevation is 40 PSI
40. How to cool a Hot Pump
• Open a nozzle
• Open a discharge
• Stick an open red line into tank-fill opening
41. How to cool a Hot Engine
• Fog spray under truck in front of the radiator
• Fog spray directly on radiator
• Open engine caulings to increase air flow
• Open engine auxillary cooler
42. What is cavitation
Air Bubbles in Pump/an increase in RPM w/o an increase in PDP
43. Cavitation Indicators
• Sudden Loss of Pressure
• An increase in pump speed w/out corresponding increase in pump pressure
• Vibration
• Sounds like gravel going through the pump
44. Relay Pumping
• PDP = FL + 20
• Calculate forward pumper GPM and calculate FL for the supply line add 20 PSI
45. Multi Supply Lines - Same Length
Divide total flow by # of lines.  Calculate Friction Loss. Total flow / # of lines
46. Multi Supply Lines - Different Length
Add length of all lines, divide total length by # of lines. Calculate Friction Loss using resulting length.
47. Max hose pressure, handline = __ GPM
250 PSi
48. Max hose pressure, Jacketed (Ladder) = __ GPM
250 PSI
49. Max hose pressure, 4" non-jacketed = __ GPM
180 PSI
50. Hydrant Flow (Static/Residual)
• 0-10% drop  3 X current Flow
• 11-15% drop 2 X current flow
• 16-25% drop 1 X current flow
• 26% or more is < current flow

*Tip determine 10%, then add 1/2 that number for 15% then add the entire # for 25%

• Ex. Static pressure is 80.
• 10% is 8
• 15% is 12
• 25% is 20
51. Cavitation Prevention and Correction
• Maintain a minimum of 20PSi intake pressure
• Reduce pump speed
• improve water supply
52. Foam PDP is __
100 PDP.  foam is always 100 PDP!
 Author: cop121 ID: 295947 Card Set: Hydraulics Updated: 2015-02-21 21:40:39 Tags: Peoria Fire Hydraulics Folders: Description: All in formation taken from cheat sheet know this Show Answers: