Pump Operator Study Guide

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Author:
lynch329
ID:
90911
Filename:
Pump Operator Study Guide
Updated:
2011-06-16 23:57:59
Tags:
hydraulics
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Description:
Driver Engineer Hydraulics
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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
  19. Head pressure is for elevation. Add ___ psi per foot.
    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.

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