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EST SHIT > pump ops > Flashcards

pump ops Flashcards

1
Q

what are the 6 principles of pressure?

A

fluid pressure is perpendicular to any surface on which it acts
fluid pressure at a point at rest is the same intesity is all directions
pressure applied to confined liquid is transmitted equally in all directions
pressure of liquid in an open vessel is proportional to its depth
pressure of a liquid in an open vessel is proportional to density of the liquid
pressure of liquid at the bottom of vessel is independent of vessels shape

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2
Q

what is a direct pumping system

A

river or water source goes through pump up to the community

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3
Q

what is a gravity system water source

A

water tower or dam

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4
Q

what is a combination water source system

A

direct pumping systems that feed into towers

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5
Q

the 3 water distribution systems

A

primary feeders, secondary feeders (to cul de sacs) and distributors (big lines to houses)

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6
Q

handlines are operated at a maximum of what?

A

350kpa or 50psi

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7
Q

discharge (flow rate for smooth bores) formula (in L/min)

A

L/min = constant (0.067) x diameter x square root ofnozzle pressure

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8
Q

friction loss per hose length (38mm and 65mm)

A

38 = 125kpa per section
65 = 50 kpa per section

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9
Q

what is the working pressure on a fog nozzle? (L/min)

A

475L/min

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10
Q

what equals total pressure loss?

A

friction loss + elevation pressure

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11
Q

for master streams how much pressure should you add to pressure loss calculations?

A

175kPa

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12
Q

how do piston pumps operate

A

using a piston that creates pressure that operates the intake and idscharge valves, PTO driven up to 1000psi (7000 kpa)

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13
Q

what is the NFPA 1901 discharge requirement for trucks with pump capacity of 3000L or greater

A

at least 2 65mm discharges

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14
Q

NFPA 1901 discharge requirement for trucks with pump capacity of less than 3000L

A

1 65mm discharge

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15
Q

most common type of valve

A

ball valve (less friction loss)

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16
Q

putting a pump into operation (steps)

A

open tank to pump valve
open discharges to hoselines to be used
open valves and the hoselines begin to fill with water
increase throttle and the pressure in the hoselines will increase
reach the proper pressure only when water is flowing, once the hoseline is opened you may need to adjust pressure accordingly
monitor all gauges with the engine as well as the operation of hte fire pump
adjust throttle until desired flow rate is achieved if a flowmeter is in use.

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17
Q

2 pressurized supply sources

A

fire hydrant and supply hose from another pumper

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18
Q

do not let the master intake rev below what ?

A

140 kpa or else the pump with cavitate

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19
Q

what measure can most pumps develop a vacuum capacity of?

A

22inches of mercury

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20
Q

how many inches of water much be over a traditional strainer for it to reach its rated capacity

A

24 inches

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21
Q

whats the minimum a pump has to be able to lift water?

A

10 feet/3 meters

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22
Q

while drsfting what must your pressure be?

A

between 350-700kpa

23
Q

what amount of pressure should you pump into standpipes or FDC if no other info is available?

A

150psi (1050kpa)

24
Q

what does lift mean?

A

the difference in elevation between the surface of static water supply and the center of the pump intake

25
Q

max lift formula

A

L = (constant) 1.13 x (inches of mercury) 14

26
Q

dependable lift

A

height a column of water may be lifted in sufficient quantity to provide a reliable flow

27
Q

back flushing

A

cleaning a fire pump or piping by flowing water through it in the opposite direction of natural flow

28
Q

relay operation

A

using 2 or more pumpers to move water over a long distance by operating them in series. (biggest pump closest to water, smaller further down the relay)

29
Q

what mode do drafting and relay positions operate in

A

rpm

30
Q

formula for how many pumpers needed to supply an amount of water

A

P = (relay distance) + 1
(distance from the max water flow distance table)

31
Q

tender pumps with how many L per minute are classified as a tender?

A

3000L

32
Q

what is an open butt

A

end of a charged hoseline without a nozzle

33
Q

flow rate of tender calculation ?

A

flow = 0.9(90% of tank capacity constant) x tank size
trip time

= flow rate in L/minute

34
Q

what does foam do

A

makes water wetter and allows water to penetrate better.

35
Q

what is batch mixing

A

foam concentrate into water tank

36
Q

eductor mixing (foam)

A

water squeezed through a small place making a speed increase making increased pressure

37
Q

injection (foam)

A

uses higher than system pressure to inject into the system (piston pumps)

38
Q

cafs (foam)

A

compressed sir foam system, compressor provides air for a more consistent foam system.

39
Q

Class A and CLass B foam measurements

A

A = 0.1-1%
B = 1-6%

40
Q

4 ways to apply foam

A

roll on
bank down
rain down
direct

41
Q

what nozzles can be used for foam application

A

fog nozzle or aeration, nozzles

42
Q

expansion ratings for foam

A

medium = 20:1
high = 200:1 up to 1000:1

43
Q

types of foam

A

regular protein foam = chicken guts
fluroprotein = synthetic
film forming fluroprotein = suffocating blanket
AFFF = water based

44
Q

what is a centrifugal pump rated to pump at their max volume capacity at draft

A

150 psi or 1050kpa

45
Q

what are centrifugal pumps

A

none positive displacement pump as it does not pump a definite amount of water with each revolution. (rapidly revolving disc that throws water, has an impeller as the eye in its center)

46
Q

examples of positive displacement pumps

A

piston pumps
rotary pumps (simplist)
rotary gear pumps

47
Q

two types of flowmeters

A

paddle wheel
spring probe

48
Q

how much psi should u add to the friction loss calculation for each appliance added

A

10 pso

49
Q

elevation pressure loss formula

A

EP(PSI) = (a constant) 0.5 x height in feet

50
Q

what is the friction loss per floor (elevation)

A

35pka (minus 1 floor for the first floor)

51
Q

pressure needed for a fog nozzle

A

700kpa

52
Q

pressure needed for a solid stream/smooth bore/handheld line

A

350kpa

53
Q

pressure needed for a standpipe system

A

150psi (1050kpa)

EST SHIT (3 decks)

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