pump ops

Question 1

what are the 6 principles of pressure?

Answer 1

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

Question 2

what is a direct pumping system

Answer 2

river or water source goes through pump up to the community

Question 3

what is a gravity system water source

Answer 3

water tower or dam

Question 4

what is a combination water source system

Answer 4

direct pumping systems that feed into towers

Question 5

the 3 water distribution systems

Answer 5

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

Question 6

handlines are operated at a maximum of what?

Answer 6

350kpa or 50psi

Question 7

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

Answer 7

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

Question 8

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

Answer 8

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

Question 9

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

Answer 9

475L/min

Question 10

what equals total pressure loss?

Answer 10

friction loss + elevation pressure

Question 11

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

Answer 11

175kPa

Question 12

how do piston pumps operate

Answer 12

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

Question 13

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

Answer 13

at least 2 65mm discharges

Question 14

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

Answer 14

1 65mm discharge

Question 15

most common type of valve

Answer 15

ball valve (less friction loss)

Question 16

putting a pump into operation (steps)

Answer 16

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.

Question 17

2 pressurized supply sources

Answer 17

fire hydrant and supply hose from another pumper

Question 18

do not let the master intake rev below what ?

Answer 18

140 kpa or else the pump with cavitate

Question 19

what measure can most pumps develop a vacuum capacity of?

Answer 19

22inches of mercury

Question 20

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

Answer 20

24 inches

Question 21

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

Answer 21

10 feet/3 meters

Question 22

while drsfting what must your pressure be?

Answer 22

between 350-700kpa

Question 23

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

Answer 23

150psi (1050kpa)

Question 24

what does lift mean?

Answer 24

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

Question 25

max lift formula

Answer 25

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

Question 26

dependable lift

Answer 26

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

Question 27

back flushing

Answer 27

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

Question 28

relay operation

Answer 28

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)

Question 29

what mode do drafting and relay positions operate in

Answer 29

rpm

Question 30

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

Answer 30

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

Question 31

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

Answer 31

3000L

Question 32

what is an open butt

Answer 32

end of a charged hoseline without a nozzle

Question 33

flow rate of tender calculation ?

Answer 33

flow = 0.9(90% of tank capacity constant) x tank size trip time = flow rate in L/minute

Question 34

what does foam do

Answer 34

makes water wetter and allows water to penetrate better.

Question 35

what is batch mixing

Answer 35

foam concentrate into water tank

Question 36

eductor mixing (foam)

Answer 36

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

Question 37

injection (foam)

Answer 37

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

Question 38

cafs (foam)

Answer 38

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

Question 39

Class A and CLass B foam measurements

Answer 39

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

Question 40

4 ways to apply foam

Answer 40

roll on bank down rain down direct

Question 41

what nozzles can be used for foam application

Answer 41

fog nozzle or aeration, nozzles

Question 42

expansion ratings for foam

Answer 42

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

Question 43

types of foam

Answer 43

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

Question 44

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

Answer 44

150 psi or 1050kpa

Question 45

what are centrifugal pumps

Answer 45

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)

Question 46

examples of positive displacement pumps

Answer 46

piston pumps rotary pumps (simplist) rotary gear pumps

Question 47

two types of flowmeters

Answer 47

paddle wheel spring probe

Question 48

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

Answer 48

10 pso

Question 49

elevation pressure loss formula

Answer 49

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

Question 50

what is the friction loss per floor (elevation)

Answer 50

35pka (minus 1 floor for the first floor)

Question 51

pressure needed for a fog nozzle

Answer 51

700kpa

Question 52

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

Answer 52

350kpa

Question 53

pressure needed for a standpipe system

Answer 53

150psi (1050kpa)