Pump Manual - Definitions Flashcards

1
Q

Atmospheric pressure

A

14.7

Affects amount of vacuum that can be generated inside a pump and how high water can be drafted

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2
Q

Back flushing

A

Flowing water through a discharge and out of an intake to remove debris

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3
Q

British Thermal Unit (BTU)

A

energy needed to cool or heat one point of water by one degree Fahrenheit

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4
Q

Critical application rate (CAR)

A

GPM per sqft of foam needed to extinguish flammable liquid fires

  1. 1 GPM/sqft for hydrocarbons
  2. 2 GPM/sqft for polar solvents
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5
Q

Critical velocity

A

Point at which sped of water from a centrifugal pump creates so much turbulence that it makes it impossible to move any more water

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6
Q

Dependable lift

A

height that a column of water can be lifted to provide a reliable fire flow

14.7 ft at sea level

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7
Q

Freeman’s formula

A

Calculates GPM flow from solid bore/hydrant

GPM = 29.7 x D^2 x sqrt(NP)

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8
Q

Dual pumping

A

Using a strong hydrant to supply two pumpers by connecting intake to intake

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9
Q

Eductor rate (ED)

A

Application % for eductors:

3% for hydrocarbons
6% for polar solvents
Class A: 0.1 - 1.0%

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10
Q

Expansion rating ratio

A

Expansion ratio assigned to aeration nozzles and foam expanding attachments used as part of a formula to calculate the amount of area that aerated foam will cover

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11
Q

FDC standard pressure for spinklers

A

150 PSI

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12
Q

Fire Load

A

Avg weight lbs/sqft of contents of a room

Avg begroom has 4.3 lbs/sft

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13
Q

Fuel load

A

Total quantity of combustible contents of a building, space or fire area including interior finish and trim.

Expressed in heat units of equivalent weight in wood

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14
Q

Head pressure

A

For every 1’ increase in elevation .434 PSI increase

e.g. 5 lbs per floor

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15
Q

Master stream

A

large caliber hose that flows 350 GPM or more

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16
Q

Maximum lift

A

Height a pumper in good condition can be expected to life water at draft.

Generally considered 2/3 of the theoretical life, or between 22-25 feet

17
Q

Max dependable flow

A

75% of the total capacity of an engine

this is the max flow for an engine during a relay operation

18
Q

Needed Fire Flow (NFF)

A

The amount of water (in GPM) needed to control the fire within 1 min

19
Q

Normal operating pressure

A

Pressure in a water system during regular domestic consumption

20
Q

Parallel (Volume) mode

A

In a two-stage pump, source water flows from intake into the eye of both impellers simultaneously

Each impeller pumps 50% of that rated GPM capacity of the pump

21
Q

Priming Pump

A

Positive displacement pump that pumps air out of centrifugal pumps…when activated, reduces pressure inside pump below 14.7 (atmospheric pressure)

22
Q

Pump Discharge Pressure Formula

A

PDP = NP + FL +- EP + AFL

23
Q

Reasonable Efficiency

A

% of water that is actually converted into steam in a fire = 80%

24
Q

Series (Pressure) mode

A

First stage impeller increases pressure and dishcarges 50-70% of the volume capacity through the transfer valve and into the eye of the 2nd impeller

25
Specific heat
amount of heat needed to raise the temp of a specific quantity of material, and the amount of heat needed to raise the temp of a identical weight of water by the same # of degrees (measured in BTUs)
26
Static pressure
Stored potential energy available to force water through pipes, fittings, fire hose, and adapters while water is at rest
27
Tandem pumping
Short relay. Pumper at water source pumps to the intake of second pumper. Used when pressures higher than the capabilities of a single pump are required.
28
Theoretical lift
Theoretic height that a column of water can be lifted by atmospheric pressure in true vacuum 33.9 ft at sea level (14.7 x 2.304 psi = 33.9)
29
Total pressure
PSI X number of square inches in a cross-section of an area upon which force is exerted
30
Type 1 Pumper
100% of its rated capacity at 150 psi 70 % of its rated capacity at 200 psi 50% of its rated capacity at 250 psi Measured from draft lifting water at least 10 ft