# Pump Operator Study Guide

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1. 1 gallon of water weighs?
8.35 lbs
2. 1gallon of water in CI (cubic inches)
231 ci
3. Cubic inches (ci) in a cubic foot (cf)
1728
4. 1 cf of water weighs?
62.5 lbs
5. 1 cf in gallons?
7.481
6. Force =
lbs
7. Pressure =
psi/psf
8. 1 sq foot in ci?
144 ci
9. Height to create 1 psi?
2.304 ft
10. 1 psi will raise a column ?
2.304 ft
11. Pressure is based on ht. Preferred formula for psi if you have height?
psi = h x .434
12. Formula for height if you have psi?
H = psi / .434
13. Formula for volume in a cylinder in cubic ft.
V = .7854 x D2 x L x 7.481(gallons in cf)
14. Formula for cubic feet?
CF = .7854 x D2 x L
15. Formula for tank volume (rectangle)?
L x W x H = CF
16. Formula for volume in gallons (rectangle)?
7.481 gallons in a CF
L x W x H x 7.481 = volume in gallons
17. Atmospheric pressure at sea level?
14.7 psi
18. Max elevation decrease for drafting?
33.9 ft
add 4.34 psi per foot of elevation
20. Back pressure is for decrease in elevation. Decrease ___ psi per foot.
decrease 4.34 psi per foot
21. Pressure while water standing still in pipes.
Static pressure
22. Standard pressure in pipes.... fluctuates during peak water hrs.
normal operating pressure
23. Left over pressure
residual pressure
24. Pressure of the line while flowing
Flow pressure
25. Pressure of the pump while pumping
net pump pressure
26. Convert tip size into decimal equivelalent.
Divide top number by bottom number.

example - 3/4" tip = .75
27. Formula for figuring discharge of a smooth bore nozzle.
Q = 29.7 x D2 x √NP
28. Formula for calculating hydrant discharge
• Q = 2.97 x D2 x √P x .9
• √P = (sq root of hydrant Pressure)
29. Nozzle reaction is measured in ___ not ____.
lbs not psi
30. Formula for calculating nozzle reaction on smooth bore nozzle.
1.57 x D2 x NP = NR
31. Formula for calculating nozzle reaction for fog nozzle.
.0505 x Q x √NP = NR
32. Define TPL
total pressure loss - to be added to nozzle pressure. Includes FL, elevation, appliance loss.

note* when asked for TPL only include the higher FL line in equation
33. Difference between TPL and TPDP?
(Total Pump Discharge Pressure)
TPDP is TPL + NP.
34. Define Equation A
• FL = CQ2L
• (used to determine FL in fire hose)
• C is coefficient. # related to size hoze in diameter
• Q is quantity GPM. Divide by 100. ex- GPM/100
• L is length. Divide by 100. ex- L/100
35. Coefficient for 1 1/2"
24
36. Coefficient for 1 3/4
15.5
37. Coefficient for 2 1/2"
2
38. Coefficient for 3" with 2 1/2" coupling
.8
39. Coefficient for 3" with 3" coupling
.677
40. Coefficient for 4"
.2
41. Coefficient for 5"
.08
42. When laying multiple lines, add which nozzle pressure?
The higher pressure
43. Fog nozzle pressure
100 psi
44. Smooth bore nozzle pressure
50 psi
45. Master stream nozzle pressure
80 psi
46. Add ____ psi for pressure loss in an appliance if gpm greater than ____
add 10 psi if greater than 350 gpm
47. Appliance loss for a master stream?
25 psi regardless of flow
48. Is a standpipe considered an appliance?
Yes
49. Define equation B
• Used for elevation loss or gain
• E = H x .5
50. Maximum GPM a hose can handle
Critical velocity
51. Critical velocity of 1"
30 gpm
52. Critical velocity of 1 1/2"
100 gpm
53. Critical velocity of 1 3/4"
200 gpm
54. Critical velocity of 2 1/2"
300 gpm
55. Critical velocity of 3"
500 gpm
56. Critical velocity of 5"
1200 gpm
57. Define equation C
• EP = 5 psi x (number of stories -1)
• 3rs story is + 10 psi
58. Do you add appliance loss?
Yes
59. Truck to truck pressure loss? How much do you add?
• 20 psi
• If you use 2 lines, add 10 psi to each line.
60. Psi to operate a standpipe?
• 150 up to 10th floor.
• 180 psi above 10th floor.
61. Max psi for standpipe?
200 psi
62. Add 10 psi to standpipe for every ____ feet of hose.
100 ft
63. Formula for sprinkler system?
1/2 P (pressure) + 15 = Q (gpm)
64. To operate sprinkler system start at ____ psi.
• 150 psi.
• Go up in increments of 25 psi.
• Max of 200 psi.
65. Define equation E
Net Pump Discharge Pressure

NPDP = PDP - intake readings.
 Author: lynch329 ID: 90911 Card Set: Pump Operator Study Guide Updated: 2011-06-17 03:57:59 Tags: hydraulics Folders: Description: Driver Engineer Hydraulics Show Answers: