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A fitting Paige > Equations > Flashcards

Equations Flashcards

1
Q

Natural Gas Formula

A

1CH4+2o2+8N2=1Co2+2H20+8N2

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2
Q

Propane Gas formula

A

1C3H8+5o2+20N=3co2+4H2O+20N

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3
Q

lbs for CO2 Variables

A

117 NG and 135 Propane

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4
Q

LBS of C02 equation

A

(variable/1,000,000) x BTU input

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5
Q

% of C02

A

CO2/ total dry gases X100 (Don’t multiply by 100 if you do not want percent)

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6
Q

% of 02

A

02/ total dry gases X100 (Don’t multiply by 100 if you do not want percent)

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7
Q

What is the first equation for on the Gas formulae sheet

A

Q=CFM x 1.2 x deltaT
DFMUA for BTU

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8
Q

Steps for finding water produced

A

Divide BTU by CV (1000 or 2500)
Multiple by H20 produced (4 for propane 2 for NG)
divide by expansion ratio (1700)
Multiply by Us gal or Imperial Gas (7.48 US gal 6.24 Imperial Gal)

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9
Q

Absolute Zero

A

460 and 273

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10
Q

Atmospheric pressure

A

14.73 or 101.325

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11
Q

Second equation in Gas formulae sheet

A

Orifice flow (In gas code)
Q=flow
K factor
Area
delta P pressure drop across burners (Psi or “w.c)
SG- Specific gravity (.6 or 1.51)
(1psi is 27.08 inches water column)

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12
Q

How many Inches water column is 1 PSI

A

27.7

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13
Q

What is the variable change equation for orifice flow

A

Q2/Q1= K2/K1 X A2/A1 X square rootDeltaP2/DeltaP1 X squarerootSG1/SG2
Notice SG is flipped*

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14
Q

Expansion Of NG

A

600

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15
Q

Expansion of Propane

A

270

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16
Q

Expansion rate for steam to water

A

1700

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17
Q

How to transpose the orfice flow equation easily

A

Q divided by full equation = what your looking for

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18
Q

Third equation on list is for what

A

Clocking a meter
Q= Flow rate (Multiply but CV to get BTU)
t=rotation time in seconds
v-Dial size
PL- inlet pressure
PA- Sea level pressure
PS- Sea level pressure
TA 60 degrees
TS- Absolute
TA(bottom) Gas Temp
T- Absolute

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19
Q

Imperial gal

A

6.24

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20
Q

US Gal

A

7.48

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21
Q

Forth Equation on Gas formulae sheet

A

P1 X V1 / T1 = P2 X V2 / T 2 OR
P1 X T2 X V1 = P2 x T1 X V2

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22
Q

DFMUA Velocity equation

A

Velocity= T1 plus absolute / T2 plus absolute
muliplied by V2

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23
Q

Correction temp equation

A

60 plus absolute / wrong temp plus absolute
(460 or 273)

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24
Q

Correction pressure equation

A

wrong press + absolute / absolute
(14.73 or 101.325)

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25
Q

Fifth equation on gas formulae sheet

A

Velocity = 4005 X squareroot of deltaP

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26
Q

How many Oz in a pound

A

16

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27
Q

Sixth equation on the formula sheet

A

Theoretical Natural Draft
Ts- average stack temp plus absolute (460 or 273)
Ta- Ambient temp plus absolute
H Height of chimney

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28
Q

Excess air dry reading equation

A

0.895 X %A / 0.21 - %A

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29
Q

Excess air wet reading equation

A

1.105 x %B / 0.21 - %B

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30
Q

Seventh Equation on gas formulae sheet

A

Velocity= Volume / area

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31
Q

Latent heat of water to ice

A

144

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32
Q

Latent heat of water to steam

A

970.4

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33
Q

Calculating a state change from water to ice

A

144 X weight

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34
Q

Calculating a state change from water to steam

A

970.4 X weight

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35
Q

Eighth equation on gas formulae sheet

A

Area = Diameter squared X 0.7854
Or D= squareroot of area / 0.7854

36
Q

Turn down ratio calculation

A

high fire / low fire
or max temp - min temp
divied by min rise

37
Q

Calculation temperature change in water/ice/steam

A

specific heat X weight in lbs X DeltaT

38
Q

Specific Gravity of NG

A

0.6

39
Q

Specific gravity of Propane Vapour

A

1.51

40
Q

Specific gravity of Propane Liquid

A

1.51

41
Q

Calculation Net stack

A

Stack temp minus ambient temp

42
Q

Flow increase on Diameter change

A

D2 ^2.623 divided by D1 ^2.623
Multiple by 100 for a percentage

43
Q

Purge opening equation

A

square root D2/60
Cannot be less than 1/2”

44
Q

Purge Time

A

Length of pipe/200 X2(safety factor)

45
Q

Volume of pipe for purge calculation

A

Vol= (D/12)squared X .7854 X length

46
Q

Second page #1 equation on Gas formula sheet

A

Flow equation/Pipe sizing
Q-Flow (multiple by CV for BTU)
D-Diameter
P1- (Service pressure plus absolute) Squared
P2- (Pressure at end of pipe plus absolute)Squared
L-Length

47
Q

How many cubic feet are in a pressure cyclinder

A

226

48
Q

Size of the cyclinder

A

1.5

49
Q

Normal flue temp

A

350-500

50
Q

Normal stack Velocity

A

.02-.16

51
Q

Third equation on Page 2 gas formulae sheet

A

LBS CO2
Variables 117 NG 135 Propane

52
Q

Converting square inches to square feet

A

Multiple by 144

53
Q

Forth equation on 2nd Page

A

Air free CO PPM

54
Q

Voltage triangle

A

E
I R
E-Volts
I-Amps
R-ohms

55
Q

Watts Triangle

A

P
E I
P-watts
E-Voltage
I-Ohms

56
Q

fifth equation on Page 2

A

PPm Nox

57
Q

Sixth equation on Page 2

A

Fuel Loss
Ts- Fuel temp in C
Ta Supply air temp

Efficiency is 100 minus answer

58
Q

How to convert Miliamps to Amps

A

Divide by 1000

59
Q

Normal Hz of a motor

A

60 Hz

60
Q

Seventh equation on page 2

A

Motor speed

61
Q

Poles and RPMS

A

2-3600
4-1800
6-1200
8-900

62
Q

Ninth equation on page 2

A

Slip
Ns- RPM
NR-Rotar speed on motor

63
Q

Tenth Equation on Page 2

A

Torque
PhP- Horse power
n-RPM

64
Q

Page 3 1st equation

A

Torque in metric
Pkw- Kilowatts
n-RPM

65
Q

Page 3 second equation

A

Star circuit
phase volt divide by coil is amps
ephase X squareroot of3

66
Q

Page 3 3rd equation

A

Wye circuit
Phase voltage / Coil amps is amps
Line voltage / squareroot of 3 is volts

67
Q

Page 3 4th equation

A

Stunt resistance

68
Q

How to get BHP to BTU

A

multiple by 33475

69
Q

1 BHP is

A

34.5 LBS of 212 water or steam X LHV 970.4

70
Q

How many btu of 1 foot of 215 steam

A

240

71
Q

Hot many BTU is 1 foot of 170 water

A

150

72
Q

How much is pipe loss in an EDR

A

33%

73
Q

How to calculate gross EDR

A

Rad EDR multiply by piping

74
Q

What is net EDR

A

Just the Rad without the piping

75
Q

Equation for Wobbe

A

High heat Volume of gas divided by the squareroot of specific gravity

76
Q

How many air changed for a purge

A

4

77
Q

How much air has to be moving

A

60% of high fire

78
Q

How to calculate vol of container for purge time

A

(Diameter/12”)squared X .7854 X length(Minus insinuation)
Water Vol- lbs of water capacity / 62.4
Take body vol and minus water vol

79
Q

How to calculate Time for purge time

A

Fuel burners X 10ft X 1.2 (excess air)
Divided by 3600 to get to sec
Take vol of body(Multiply theby 4) and divide by fuel found in seconds
divide by 60 %

80
Q

How to calculate available stack draft

A

theoretical draft X .80

81
Q

Calculating volume of flue gases going up chimney

A

First take BTU / CV
Multiply that by your air needed and excess air then add gas back in

Put variables in the t2 x v2 = t1 x t2 to get your volume than change volume in per min (Divide by 60)
t2 x v2 = t1 x t2
T1-ambient temp plus absolute
T2-Stack temp plus absolute
V1-fuel + combustion air + excess air
Make stack size into area (Stack size/12) sqaured X 0.7854

Vel= volume/area = Answer

82
Q

Equation to find deltaP using Velocity

A

DeltaP= (Velocity/4005) squared

83
Q

Steps for calculating Full Load RPM change

A

Use RPM equation with new HZ
Use Slip equation with Old RPM
Take the new RPM multiple by slip rating (Decimal)
Take the new RPM and subtract the answer in step 3

84
Q

Expansion tank sizing

A

Coefficient of vol multiply by
Volume of system Multiplied by
Change in liquid temp

85
Q

Liquid gas into btu

A

Liquid divide by gal x 270 expansion x c.v

86
Q

Mixed fuel new flow

A

Q2 = q1(org) squareroot sg1(org)/sg2 (mix)
Multiply by new c.v for btu

87
Q

Calculating new sg and cv with propane mix air and fuel

A

Take new gas % and multiply by c.v= new cv valve
Take gas % and multiply by sg
Take air % and multiply by one. Add the last two steps together and is your new sg

A fitting Paige (13 decks)

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