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FEO Test-Driver/Operator > Chapter 8 Theoretical Pressure Calculations > Flashcards

Chapter 8 Theoretical Pressure Calculations Flashcards

1
Q

Combined, friction loss and elevation pressure loss are referred to as what?

A

total pressure loss (TPL)

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2
Q

What are the two methods used to determine friction loss?

A

Actual tests

Calculations

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3
Q

What is the equation for determining friction loss when the GPM and length of hose is known?

A

FL=CQ²L

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4
Q

What does “Q” indicate in the formula FL=CQ²L?

A

Flow rate in hundreds of gpm

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5
Q

What is the friction loss coefficient of 1 ¾” hose?

A

15.5

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6
Q

What is the friction loss coefficient of 2 ½” hose?

A

2

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7
Q

What is the friction loss coefficient of 5” hose?

A

.08

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8
Q

What equipment is needed to conduct accurate friction loss tests?

A 
Pitot tube or flowmeter
two in-line gauges calibrated in increments of 5psi
hose that will be tested
smoothbore nozzle (if using pitot tube)
any nozzle (if using flowmeter)
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9
Q

Appliance friction loss is insignificant in cases where the total flow through the appliance is less than what?

A

350 gpm

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10
Q

According to the text, what is psi loss is assumed for each appliance when flow is above 350 gpm?

A

10 psi for each appliance

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11
Q

According to the test, what friction loss is assumed for all master stream appliances regardless of the flow?

A

25 psi

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12
Q

Water exerts a pressure of how many psi per foot of elevation?

A

.434 psi

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13
Q

What is the equation for determining elevation pressure?

A

EP=0.5H

EP=Elevation pressure
H=height in feet

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14
Q

Hose layouts can be divided into what two categories?

A

simple hose layouts

complex hose layouts

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15
Q

What is the approx. friction loss of two hose lines of equal length that are siamesed compared to a single hose line of the same size and length?

A

approx 25% of the single hose line

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16
Q

When 3 hose lines of equal length are siamesed, the friction loss is approx _____ of that of a single line.

A

10%

17
Q

When determining friction loss in hose lines of unequal length, the total pressure loss in the system is based on what?

A

the highest loss of the two lines

18
Q

What is the equation for determining pump discharge pressure?

A

PDP=NP + TPL

PDP=pump discharge pressure
NP= nozzle pressure in psi
TPL=total pressure loss

19
Q

Virtually all fire pumps in use today are ________ pumps

A

Centrifugal

20
Q

What is NPDP?

A

net pump discharge pressure

A centrifugal pump adds pressure to incoming pressure and creates NPDP

FEO Test-Driver/Operator (6 decks)

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